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Study Protocol
Revised

The short-, medium-, and long-term prevalence of physical health comorbidities in first-episode psychosis: a systematic review and meta-analysis protocol

[version 2; peer review: 3 approved]
PUBLISHED 08 Jan 2025
Author details Author details
OPEN PEER REVIEW
REVIEWER STATUS

Abstract

Background

Individuals with first-episode psychosis (FEP) face an increased risk of physical comorbidities, notably cardiovascular diseases, metabolic disorders, respiratory disorders, and certain types of cancer. Previous reviews report pooled physical health prevalence from chronic psychosis and FEP groups. By contrast, this review will focus on antipsychotic-naïve FEP cohorts and incorporate data from observational longitudinal studies and antipsychotic intervention studies to understand the progression of physical health comorbidities from the onset to later stages of psychosis. This review aims to examine the short-, medium-, and long-term period prevalence of these comorbidities in FEP and variations related to demographic factors.

Methods

Using the PRISMA and MOOSE guidelines, Medline, Embase, PsycINFO, and CINAHL+, as well as Clinical Trials gov.uk, OpenGrey, WHO International Clinical Trials Registry Platform, Current Controlled Trials, United States National Institute of Health Trials Registry, and the Irish Health Repository, will be searched from inception. Longitudinal studies and antipsychotic intervention studies monitoring health outcomes in antipsychotic naïve FEP individuals will be eligible for inclusion. Two reviewers will independently screen titles, abstracts, and full-text articles. Risk of bias will be assessed using the Joanna Briggs Institute Critical Appraisal Checklist. A meta-analysis of the short-, medium-, and long-term prevalence of cardiovascular, metabolic, cancer, and respiratory outcomes and a narrative synthesis will be conducted. Where feasible, a meta-regression on the impact of demographic variables will be conducted. Potential limitations include the risk of diagnostic heterogeneity across studies and possible underreporting of certain comorbidities.

Conclusions

This systematic review will clarify the progression of physical health comorbidities in FEP, informing early intervention strategies and policies. Subsequent findings will be submitted to a leading journal, supplemented by a recovery education module and a lay summary for wider dissemination.

Registration

The study was registered in PROSPERO, the International Prospective Register of Systematic Reviews (CRD42023431072; 17/06/2023).

Keywords

First-episode Psychosis, Physical Health Comorbidities, Metabolic Health, Cardiovascular Health, Respiratory Health, Cancer

Revised Amendments from Version 1

In this updated protocol, we now explicitly acknowledge that some individuals with first-episode psychosis (FEP) may have pre-existing physical long-term conditions (LTCs). We have clarified that our primary focus remains on short-, medium-, and long-term prevalence of physical LTCs post-FEP, but we will record whether these comorbidities developed prior to or following FEP diagnosis. We refined the eligibility criteria by removing the blanket exclusion of organic psychotic disorders and personality disorders, allowing for a broader representation of real-world clinical populations. We also clarified that non-FEP studies will be excluded unless data specific to FEP participants are provided.

Additionally, we revised the title to highlight the intended meta-analysis. The abstract now briefly mentions potential limitations (e.g., diagnostic heterogeneity). We established a cut-off of fewer than 10 participants to define case series, specified procedures for handling missing or unresponsive data, and introduced a supplementary table (PICOS) detailing inclusion and exclusion criteria. We will collect chlorpromazine-equivalent dosages where available, and we have also expanded our planned subgroup analyses to include social deprivation and parental mental health. We now provide more detail on patient and public involvement (PPI), specifying how an expert-by-experience co-author contributed to the protocol design. Finally, we explained how diagnostic criteria (ICD-10 vs. ICD-11) will be managed and revised the Discussion to address limitations regarding sampling, diagnostic inconsistencies, and potential overrepresentation of studies from high-income countries. Minor edits were made throughout for consistent terminology, abbreviation use, and clarity.

See the authors' detailed response to the review by Luigi Francesco Saccaro
See the authors' detailed response to the review by A Dregan

Introduction

Individuals with psychosis face an increased risk of various physical health conditions, including cardiovascular diseases, respiratory disorders, metabolic disorders, and cancer (De Hert et al., 2011; Leucht et al., 2007). The increased incidence of physical comorbidities, especially cardiovascular diseases, contributes to a significant burden of physical illness and premature mortality, with individuals with psychosis experiencing a reduced life expectancy of approximately 10–20 years compared to the general population (Firth et al., 2019). A higher prevalence of lifestyle risk factors such as smoking, poor nutrition, and disrupted sleep patterns in people with psychosis contribute to these health risks (Firth et al., 2019). Additionally, shared risk factors, including non-white ethnicity and social deprivation, contribute to distinct multimorbidity patterns in psychosis (Lawrence & Kisely, 2010; Rodrigues et al., 2021). Recent research has also reported the genetic risk for schizophrenia to be associated with cardiac structural changes that can worsen cardiac outcomes (Pillinger et al., 2023). This connection further emphasises the complex interplay between genetic and lifestyle factors in shaping the health outcomes of those with psychosis.

Metabolic syndrome, encompassing dyslipidaemia, hypertension, impaired glucose regulation, and central obesity, is prevalent in up to 69% of those with chronic schizophrenia (Vancampfort et al., 2015). Although antipsychotic use may contribute to these metabolic changes, altered glucose homeostasis is already observed in antipsychotic-naïve individuals with first-episode psychosis (FEP), suggesting that metabolic disturbances emerge from the onset of psychosis (Pillinger et al., 2017a; Pillinger et al., 2017b).

Research has indicated that two-thirds of individuals with FEP will experience metabolic changes, such as impaired glucose and lipid metabolism, as well as weight gain exceeding 7% during the initial 12 months of treatment (Alvarez-Jiménez et al., 2008; Coentre et al., 2022). These metabolic changes lead to a greater risk of cardiovascular disease, stroke, and type 2 diabetes later in life, which underlines the importance of early intervention and the need for attention to physical health changes from the initial diagnosis of psychosis. Moreover, individuals with schizophrenia face a higher risk of respiratory conditions such as chronic obstructive pulmonary disease (COPD) and pneumonia (Suetani et al., 2021), which might be linked to increased active and passive smoke exposure (Hunter et al., 2020; Lally et al., 2019), childhood exposure to air pollution (Antonsen et al., 2020; Schraufnagel et al., 2019) and socioeconomic factors (Rocha et al., 2020; Sariaslan et al., 2016).

Research on the incidence of cancer in people with psychosis has been mixed, with earlier studies concluding a generally lower cancer incidence in this population (Ananth & Burnstein, 1977) and more recent reviews finding an increased risk of certain cancer types but a decrease for others (Wootten et al., 2022; Xu et al., 2017; Zhuo & Triplett, 2018). The inconsistencies between earlier and more recent studies may partially reflect the evolving practices in diagnosing and reporting cancer among those with psychosis, emphasising the importance of updating previous findings with more contemporary health data.

Despite several systematic reviews establishing the increased prevalence of physical health disorders in individuals with psychosis (Leucht et al., 2007; Oud & Meyboom-de Jong, 2009; Suetani et al., 2021; Vancampfort et al., 2013), these reviews often report pooled prevalence data from individuals with chronic psychosis and FEP, or only report FEP baseline outcomes, limiting our understanding of the evolution of physical health outcomes in FEP. Therefore, by focusing specifically on FEP cohorts, this review aims to understand the progression of physical health comorbidities from the onset to the later stages of psychosis. It also considers that certain comorbid conditions may have been present prior to FEP diagnosis and can be exacerbated by FEP or subsequent antipsychotic treatment.

Given the limited number of longitudinal FEP cohort studies reporting physical health outcomes (Suetani et al., 2021; Vancampfort et al., 2013; Wootten et al., 2022), this review will also synthesise evidence from antipsychotic intervention studies. Antipsychotic intervention studies often conduct baseline and follow-up physical health monitoring, providing data on health outcomes, particularly metabolic health. Given that antipsychotic medication commonly constitutes first-line treatment in FEP, including these studies will allow us to capture more data about the development of physical health outcomes. While we acknowledge that clinical trials may not generalise to the broader FEP population due to specific inclusion and exclusion criteria, we aim to analyse outcomes separately and then provide a comprehensive pooled analysis.

Review questions

The primary objective of this review is to systematically examine the existing evidence relating to the short-, medium- and long-term period prevalence of cardiovascular, metabolic, cancer and respiratory comorbidities in individuals with FEP.

1. What is the short-, medium- and long-term period prevalence of cardiovascular, metabolic, cancer and respiratory comorbidities in individuals with FEP?

2. To what extent do antipsychotic medications moderate or mediate the association between FEP and these physical comorbidities?

3. Does the prevalence of cardiovascular, metabolic, cancer and respiratory comorbidities vary with certain demographic factors such as age, sex, or ethnicity among individuals with FEP?

Methods

Study registration

The study was registered in PROSPERO, the International Prospective Register of Systematic Reviews (CRD42023431072; 17/06/2023). This protocol follows the PRISMA-P (Preferred Reporting Items for Systematic Reviews and Meta-Analysis Protocols; Moher et al., 2015; Zierotin et al., 2023) guidelines. The review will be conducted according to the Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) 2020 statement (Page et al., 2021) and the Meta-analyses of Observational Studies in Epidemiology (MOOSE) guidelines (Stroup et al., 2000).

Eligibility criteria

This review will include research reporting on the relationship between FEP and cardiovascular, metabolic, cancer and respiratory health outcomes. Since some participants may have pre-existing comorbidities prior to FEP, the data extraction will consider whether these conditions emerged prior to or following FEP diagnosis. Two study types will be included: 1) observational longitudinal studies investigating physical health outcomes in a FEP cohort and 2) antipsychotic intervention studies reporting the incidence of physical health outcomes in antipsychotic-naïve individuals with FEP, with no more than 28 days of antipsychotic exposure. Studies that primarily focus on non-FEP populations, such as those with severe anxiety or mood disorders will be excluded. If mixed samples (for example, severe mental illness groups) are used, we will attempt to extract the data specific to people with psychosis. If data extraction is not possible, we will contact the authors twice within a one-month period to request the data for individuals with psychosis. If multiple reports of the same study are identified, the most complete report will be included.

We will exclude single case studies and case series, specifically defining studies with fewer than 10 participants as case series. We will also exclude studies that did not measure physical health outcomes or only measured physical health at baseline. There will be no restrictions regarding language or publication period. There will be no restrictions regarding language or publication period. Studies will be selected for inclusion in the systematic review according to the following population and outcome criteria. For an overview of the eligibility criteria see Table 1 (PICOS-based inclusion and exclusion criteria).

Table 1. This table lists the search terms, and Boolean operators used to identify studies on psychotic disorders and their associations with cardiovascular, metabolic, respiratory and cancer outcomes.

The keywords are grouped by database (Medline, PsycINFO, EMBASE, CINAHL+) to illustrate the tailored search strategies used for each database.

ConceptDatabaseKeywords
Medline (via Ovid)PsycNFO (via OvidEMBASE (Via Ovid)CINAHL+ (via Ebesco)
Psychotic
disorders

AND
((first episode* or first-
episode* or first* or recent
or early* or new* or initial*
or "newly admitted") adj2
(psychos?s or psychotic
or schizo* or delusion* or
paranoi*))
((first episode* or first-
episode* or first* or recent
or early* or new* or initial*
or "newly admitted") adj2
(psychos?s or psychotic
or schizo* or delusion* or
paranoi*))
((first episode* or first-
episode* or first* or recent
or early* or new* or initial*
or "newly admitted") adj2
(psychos?s or psychotic
or schizo* or delusion* or
paranoi*))
((“first episode*” or “first-episode*”
or first* or recent or early* or new*
or initial* or “newly admitted”) N2
(psychos?s or psychotic or schizo*
or delusion* or paranoi*))
First-episode psychosis or
first-episode schizophrenia/
delusional disorder/paranoid
disorder
Cancer






OR
(Cancer* or neoplasm* or
carcinoma* or carcinogen*
or (malignan* adj (tumo?r*
or lesion)) or metastas* or
melanoma? or sarcoma?
or Mesothel?oma or
polycyth?emia vera or
Myelodysplastic or leukemia
or leucaemia or myelofibrosis
or cyst? or neurofibroma? or
glioma? or lymphoma?) or exp
neoplasms/
(Cancer* or neoplasm* or
carcinoma* or carcinogen*
or (malignan* adj (tumo?r*
or lesion)) or metastas* or
melanoma? or sarcoma?
or Mesothel?oma or
polycyth?emia vera or
Myelodysplastic or leukemia
or leucaemia or myelofibrosis
or cyst? or neurofibroma? or
glioma? or lymphoma?)
or exp neoplasms/
(Cancer* or neoplasm* or
carcinoma* or carcinogen*
or (malignan* adj (tumo?r*
or lesion)) or metastas* or
melanoma? or sarcoma?
or Mesothel?oma or
polycyth?emia vera or
Myelodysplastic or leukemia
or leucaemia or myelofibrosis
or cyst? or neurofibroma? or
glioma? or lymphoma?) or
exp neoplasm/
Cancer* or neoplasm* or
carcinoma* or carcinogen* or
(malignan* W1 (tumo#r* or lesion))
or metastas* or melanoma#
or sarcoma# or Mesothel#oma
or polycyth#emia vera or
Myelodysplastic or leukemia or
leucaemia or myelofibrosis or cyst#
or neurofibroma# or glioma# or
lymphoma# or (MH "Neoplasms+")
Cancer or neoplasms
or malignant tumour or
malignant lesion or carcinoma
or melanoma or metastasis
or sarcoma or mesothelioma
or polycythemia vera or
leukaemia or myelodysplastic
syndromes or myelofibrosis
or neurofibroma or glioma or
lymphoma or cyst
Metabolic
outcomes
(Diabet* or T2DM or mellitus
or glucose or hyperglycaemia
or insulin or prediabet* or
cholesterol or triglycerides
or "blood pressure" or
metabolic or hypertensi* or
hyperlipid* or hyperlipo*
or lipoprotein* or MetS or
HbA1c or cardiometabolic
or "waist circumference" or
"body mass index" or BMI
or hypercholesterol* or
hypertriglycerid* or "high
density lipoprotein" or "low
density lipoprotein") or
exp diabetes mellitus/ or
exp metabolic syndrome
X/ or exp dyslipidemia/
or exp hypertension/ or
exp cholesterol/ or exp
hyperlipoproteinemia/ or
exp hypertriglyceridemia/
or exp hyperlipidemia/ or
exp Hypercholesterolemia/
or exp obesity/ or exp
Hyperglycemia/ or exp
obesity/ or exp cholesterol/ or
exp insulin/
(Diabet* or T2DM or mellitus
or glucose or hyperglycaemia
or insulin or prediabet* or
cholesterol or triglycerides
or "blood pressure" or
metabolic or hypertensi* or
hyperlipid* or hyperlipo*
or lipoprotein* or MetS or
HbA1c or cardiometabolic
or "waist circumference" or
"body mass index" or BMI
or hypercholesterol* or
hypertriglycerid* or "high
density lipoprotein" or "low
density lipoprotein") or
exp diabetes mellitus/ or
exp metabolic syndrome
X/ or exp hypertension/
or exp cholesterol/ or exp
hyperlipoproteinemia/ or
exp hypertriglyceridemia/
or exp hyperlipidemia/ or
exp Hypercholesterolemia/
or exp obesity/ or exp
Hyperglycemia/ or exp
obesity/ or exp cholesterol/ or
exp insulin/
(Diabet* or T2DM or mellitus
or glucose or hyperglycaemia
or insulin or prediabet* or
cholesterol or triglycerides
or "blood pressure" or
metabolic or hypertensi* or
hyperlipid* or hyperlipo*
or lipoprotein* or MetS or
HbA1c or cardiometabolic
or "waist circumference" or
"body mass index" or BMI
or hypercholesterol* or
hypertriglycerid* or "high
density lipoprotein" or "low
density lipoprotein")
or exp diabetes mellitus/
OR exp metabolic syndrome
X/ OR exp dyslipidemia
OR exp hypertension/ OR
exp cholesterol/ OR exp
hyperlipoproteinemia/ OR
exp hypertriglyceridemia/
OR exp hyperlipidemia OR
exp Hypercholesterolemia/
OR exp obesity/ OR exp
Hyperglycemia/ OR exp
obesity/ OR exp cholesterol/
OR exp insulin
(Diabet* or T2DM or mellitus or
glucose or hyperglycaemia or
insulin or prediabet* or cholesterol
or triglycerides or "blood pressure"
or metabolic or hypertensi* or
hyperlipid* or hyperlipo* or
lipoprotein* or MetS or HbA1c
or cardiometabolic or "waist
circumference" or "body mass
index" or BMI or hypercholesterol*
or hypertriglycerid* or "high
density lipoprotein" or "low density
lipoprotein")
or (MH "Metabolic Syndrome X+")
OR (MH "Hypertension+") OR (MH
"Obesity+") OR (MH "Cholesterol+")
OR (MH "Hyperglycemia+") OR (MM
"Diabetes Mellitus, Type 2") OR (MH
"Hypercholesterolemia+") OR (MH
"Hyperlipoproteinemia+") OR (MH
"Insulin Resistance+")
Diabetes mellitus or glucose
or insulin or hyperglycaemia
or prediabetes cholesterol
or triglycerides or blood
pressure or metabolic
syndrome or hypertension or
hyperlipidaemia or lipoprotein
or HbA1c or cardiometabolic
or waist circumference or
body mass index or BMI or
hypercholesterolemia or
hypertriglyceridemia or high
density lipoprotein or low
density lipoprotein
Respiratory
outcomes


OR
(((respiratory or lung) adj
(disease or condition or
infection* or inflammation
or disorder* or aspiration
or syndrome)) or asthma or
bronch?t?s or emphysema
or pulmon?ry or COPD or
pneumon* or tuberculosis or
apn?ea or apneia or airway
obstruct* or chronic obstruct*
or infl?enza or sinusitis or
pharyngitis or tonsillitis
or laryng?t?s or dyspnoea
or pleuritis or pl?urisy or
orthopnoea or nasal polyps or
rhinitis or cough or tracheitis
or empyema or bronchial or
SARS or asphyx?a or D?spha?ia
or tuberculosis) or
*Respiratory Tract Diseases/
or *Bronchial Diseases/ or
*Asthma/ or *Bronchitis/
or *Laryngeal Diseases/
or *Lung Diseases/ or
*Nasal Obstruction/ or
*Nasal Polyps/ or *Sinusitis/
or *Rhinitis/ or *Pleural
Diseases/ or *Pleurisy/ or
*Tuberculosis, Pleural/ or
*Apnea/ or *Cough/ or
*Dyspnea/ or *Respiratory
Aspiration/ or *Airway
Obstruction/ or *Common
Cold/ or *Empyema, Pleural/
or *Influenza, Human/ or
*Laryngitis/ or *Pharyngitis/
or *Pleurisy/ or *Pneumonia/
or *Rhinitis/ or *Severe Acute
Respiratory Syndrome/ or
*Sinusitis/ or *Tracheitis/ or
*Tuberculosis/
(((respiratory or lung) adj
(disease or condition or
infection* or inflammation
or disorder* or aspiration
or syndrome)) or asthma or
bronch?t?s or emphysema
or pulmon?ry or COPD or
pneumon* or tuberculosis or
apn?ea or apneia or airway
obstruct* or chronic obstruct*
or infl?enza or sinusitis or
pharyngitis or tonsillitis
or laryng?t?s or dyspnoea
or pleuritis or pl?urisy or
orthopnoea or nasal polyps or
rhinitis or cough or tracheitis
or empyema or bronchial
or SARS or asphyx?a or
D?spha?ia or tuberculosis) or
*Respiratory Tract Diseases/
or *Bronchial Diseases/ or
*Asthma/ or *Bronchitis/
or *Laryngeal Diseases/
or *Lung Diseases/ or
*Nasal Obstruction/ or
*Nasal Polyps/ or *Sinusitis/
or *Rhinitis/ or *Pleural
Diseases/ or *Pleurisy/ or
*Tuberculosis, Pleural/ or
*Apnea/ or *Cough/ or
*Dyspnea/ or *Respiratory
Aspiration/ or *Airway
Obstruction/ or *Common
Cold/ or *Empyema, Pleural/
or *Influenza, Human/ or
*Laryngitis/ or *Pharyngitis/
or *Pleurisy/ or *Pneumonia/
or *Rhinitis/ or *Severe Acute
Respiratory Syndrome/ or
*Sinusitis/ or *Tracheitis/ or
*Tuberculosis/
(((respiratory or lung) adj
(disease or condition or
infection* or inflammation
or disorder* or aspiration
or syndrome)) or asthma or
bronch?t?s or emphysema
or pulmon?ry or COPD or
pneumon* or tuberculosis
or apn?ea or apneia or
airway obstruct* or chronic
obstruct* or infl?enza or
sinusitis or pharyngitis or
tonsillitis or laryng?t?s or
dyspnoea or pleuritis or
pl?urisy or orthopnoea
or nasal polyps or rhinitis
or cough or tracheitis or
empyema or bronchial
or SARS or asphyx?a or
D?spha?ia or tuberculosis) or
*Respiratory Tract Diseases/
or *Bronchial Diseases/ or
*Asthma/ or *Bronchitis/
or *Laryngeal Diseases/
or *Lung Diseases/ or
*Nasal Obstruction/ or
*Nasal Polyps/ or *Sinusitis/
or *Rhinitis/ or *Pleural
Diseases/ or *Pleurisy/ or
*Tuberculosis, Pleural/ or
*Apnea/ or *Cough/ or
*Dyspnea/ or *Respiratory
Aspiration/ or *Airway
Obstruction/ or *Common
Cold/ or *Empyema, Pleural/
or *Influenza, Human/ or
*Laryngitis/ or *Pharyngitis/
or *Pleurisy/ or *Pneumonia/
or *Rhinitis/ or *Severe Acute
Respiratory Syndrome/ or
*Sinusitis/ or *Tracheitis/ or
*Tuberculosis/
(((respiratory or lung) adj (disease
or condition or infection* or
inflammation or disorder* or
aspiration or syndrome)) or asthma
or bronch#t#s or emphysema or
pulmon#ry or COPD or pneumon*
or tuberculosis or apn#ea or apneia
or airway obstruct* or chronic
obstruct* or infl#enza or sinusitis
or pharyngitis or tonsillitis or
laryng#t#s or dyspnoea or pleuritis
or pl#urisy or orthopnoea or nasal
polyps or rhinitis or cough or
tracheitis or empyema or bronchial
or SARS or asphyx#a or D#spha#ia
or tuberculosis) or
(MM "Asthma") OR (MM "Bronchitis")
OR (MM "Laryngitis") OR (MM
"Laryngeal Diseases") OR (MM "Lung
Diseases") OR (MM "Pneumonia")
OR (MM "Apnea") OR (MM "Cough")
OR (MM "Aspiration") OR (MM
"Dyspnea") OR (MH "Rhinitis, Allergic,
Perennial") OR (MH "Rhinitis, Allergic,
Seasonal") OR (MM "Common
Cold") OR (MM "Empyema") OR (MM
"Influenza") OR (MM "Pharyngitis")
OR (MM "Pleurisy") OR (MM
"Rhinitis") OR (MM "Severe Acute
Respiratory Syndrome") OR (MM
"Sinusitis") OR (MM "Tonsillitis") OR
(MM "Tuberculosis, Pulmonary")
Respiratory disease or
lung disease or asthma or
bronchitis or emphysema or
pulmonary disease or COPD
or pneumonia or tuberculosis
or apnoea or influenza or
airway obstructive or sinusitis
or influenza or pharyngitis
or tonsillitis or laryngitis
or pharyngitis or pleuritis
or dyspnoea or pleuritis or
orthopnoea or empyema
or cough or tracheitis nasal
polyp or tuberculosis or SARS
or asphyxia or dysphagia or
tuberculosis
Cardiovascular
outcomes
(cardiovascular or
Cardiovascular disease* or
((coronary or isch#emic)
adj2 (disease or occlusion or
stenos#s or thrombos#s)) or
(myocardial adj (isch#emia
or infarct*)) or ((coronary or
myocardial or heart or cardiac)
adj2 (revasculari#ation or
angioplasty or atherectomy or
bypass)) or ((heart or cardiac
or ventricular) adj failure)
or angina or ((ventricular
or systolic or diastolic) adj
(dysfunction or impairment))
or (stroke or cerebrovascular
accident) or ((brain or cerebral
or intracranial) adj2 (infarct*
or thrombos?s or embolism))
or transient isc#emic attack or
tachycardi* or heart attack* or
(heart adj2 (attack or disease))
or left ventricular hypertrophy)
or Cardiovascular Diseases/
or exp Myocardial Ischemia/
or exp Angina Pectoris/ or exp
Myocardial Revascularization/
or exp Heart Failure/ or exp
Ventricular Dysfunction/ or
exp brain ischemia/ or exp
intracranial arterial diseases/
or exp "intracranial embolism
and thrombosis"/ or exp
stroke/
“cardiovascular disease*”
OR ((coronary or isch?emic)
adj2 (disease or occlusion or
stenos#s or thrombos#s)) OR
(myocardial adj (isch?emia
or infarct*)) OR ((coronary
or myocardial or heart or
cardiac) adj2 (revasculari?ation
or angioplasty or atherectomy
or bypass)) OR ((heart or
cardiac or ventricular)
adj failure) OR angina OR
((ventricular or systolic or
diastolic) adj (dysfunction or
impairment)) OR (stroke or
‘cerebrovascular accident’)
OR ((brain or cerebral or
intracranial) adj2 (infarct* or
thrombos?s or embolism))
OR ‘transient isc?emic attack’
OR tachycardi* OR ‘heart
attack*’ OR (heart adj2
(attack or disease)) OR ‘left
ventricular hypertrophy’ or
cardiovascular disorders/
or exp heart disorders/ or
exp arteriosclerosis/ or exp
ischemia/ OR cerebrovascular
disorders/ OR cerebral
arteriosclerosis/ OR exp
cerebral ischemia/ OR
cerebrovascular accidents/
“cardiovascular disease*”
OR ((coronary or isch?emic)
adj2 (disease or occlusion or
stenos#s or thrombos#s))
OR (myocardial adj
(isch?emia or infarct*)) OR
((coronary or myocardial
or heart or cardiac) adj2
(revasculari?ation or
angioplasty or atherectomy
or bypass)) OR ((heart or
cardiac or ventricular)
adj failure) OR angina OR
((ventricular or systolic or
diastolic) adj (dysfunction or
impairment)) OR (stroke or
‘cerebrovascular accident’)
OR ((brain or cerebral or
intracranial) adj2 (infarct* or
thrombos?s or embolism))
OR ‘transient isc?emic attack’
OR tachycardi* OR ‘heart
attack*’ OR (heart adj2
(attack or disease)) OR ‘left
ventricular hypertrophy’
or cardiovascular disease/
OR ischemic heart disease/
OR exp acute coronary
syndrome/ OR exp angina
pectoris/ OR coronary artery
atherosclerosis/ OR coronary
artery obstruction/ OR
coronary artery thrombosis/
OR exp heart infarction/ OR
heart muscle ischemia/ OR
ischemic cardiomyopathy/
OR angina pectoris/ OR heart
muscle revascularization/
OR heart failure/ OR
heart ventricle function/
cerebrovascular disease/
OR exp brain infarction/ OR
exp brain ischemia/ OR exp
cerebrovascular accident/
"cardiovascular disease*" OR
((coronary or isch#emic) N2
(disease or occlusion or stenos#s
or thrombos#s)) OR (myocardial
N (isch#emia or infarct*)) OR
((coronary or myocardial or heart
or cardiac) N2 (revasculari#ation
or angioplasty or atherectomy or
bypass)) OR ((heart or cardiac or
ventricular) N failure) OR angina OR
((ventricular or systolic or diastolic)
N (dysfunction or impairment))
OR (stroke or "cerebrovascular
accident") OR ("brain" OR "cerebral"
OR "intracranial") W2 ("infarct*"
OR "thrombos?s" OR "embolism")
OR AB ("brain" OR "cerebral" OR
"intracranial") W2 ("infarct*" OR
"thrombos?s" OR "embolism") OR
Tl ("ventricular" OR "systolic" OR
"diastolic") W1 ("dysfunction" OR
"impairment") OR AB ("ventricular"
OR "systolic" OR "diastolic") W1
("dysfunction" OR "impairment")
OR Tl ("heart" OR "cardiac" OR
"ventricular") W1 "failure" OR
AB ("heart" OR "cardiac" OR
"ventricular") W1 "failure" OR
Tl ("coronary" OR "myocardial"
OR "heart" OR "cardiac") W2
("revasculari#ation" OR "angioplasty"
OR "atherectomy" OR "bypass")
OR AB ("coronary" OR "myocardial"
OR "heart" OR "cardiac") W2
("revasculari#ation" OR "angioplasty"
OR "atherectomy" OR "bypass") OR
"angina"

OR
(MH "Cerebral lschemia+") OR (MH
"lntracranial Arterial Diseases+")
OR (MH "lntracranial Embolism and
Thrombosis+") OR (MH "Stroke+")
OR (MH "Ventricular Dysfunction+")
OR (MH "Heart Failure+") OR (MH
"Myocardial Revascularization+")
OR (MH "Myocardial lschemia+") OR
(MH "Cardiovascular Diseases")
Cardiovascular diseases or
ischemic heart diseases or
acute coronary syndrome
or myocardial ischemia
or myocardial infarct or
cardiac failure or ventricular
dysfunction or angina or
coronary artery atherosclerosis
or coronary artery obstruction
or thrombosis or heart infarct
or ischemia or cardiomyopathy
or stroke or cerebrovascular
disease or heart failure

Population

The population includes individuals with a first-episode diagnosis of psychosis, either clinician-diagnosed, confirmed through medical records, or enrolled in a clinical program dedicated to psychosis (for example, Early Intervention in Psychosis). First-episode psychosis is defined as first treatment contact (inpatient or outpatient) regardless of the duration of untreated illness. There are no restrictions regarding the age of participants. For studies to be eligible for inclusion, individuals with FEP should have no more than 28 days of antipsychotic drug exposure at the minimal effective dose, as recommended by the Maudsley clinical guidelines (Owen et al., 2014). If a study includes a subset with longer exposure, we will not automatically exclude it but will document the proportion and, if feasible, conduct sensitivity analyses to examine any impact on overall findings.

Outcomes

The primary outcome is the prevalence or incidence of metabolic, cardiovascular, cancer or respiratory outcomes in individuals with FEP. Physical health outcomes must be confirmed by a clinician, enrolment in a clinical program dedicated to the physical illness, medical records, or primarily according to International Classification of Diseases (ICD)-10 criteria. However, for interpretation consistency and considering recent updates, any ambiguities in outcomes will be assessed against the ICD-11 criteria. Eligible studies must report the prevalence/incidence of these health outcomes at a specified follow-up time point post the initial psychosis diagnosis, meaning the studies should specify the duration from the first diagnosis of psychosis to the time when these physical health outcomes were reported. There are no restrictions regarding the study time frame. In the context of this review, the terms “short-”, “medium-” and “long-term prevalence” refer to the occurrence of cardiovascular, metabolic, cancer, and respiratory comorbidities in individuals diagnosed with FEP over specific time intervals post-diagnosis. Specifically, “short-term prevalence” assesses these comorbidities from >0–12 months following an FEP diagnosis, “medium-term prevalence” spans from 13–36 months post-diagnosis, and “long-term prevalence” encompasses both 37–60 months post-diagnosis and periods exceeding 5 years. The secondary outcome of interest concerns the impact of demographic and study variables, such as age, sex, ethnicity and study year, as well as antipsychotic medication on the prevalence of cardiovascular, metabolic, cancer and respiratory comorbidities.

Information sources

The following databases will be searched from inception for publications: Medline, Embase, PsycInfo, and CINAHL+. Grey literature, including ClinicalTrials gov.uk, OpenGrey, WHO International Clinical Trials Registry Platform, Current Controlled Trials, United States National Institute of Health Trials Registry, and the Irish Health Repository, will be searched. The searches will be re-run prior to the final analysis.

Search strategy

The literature search strategy will use Medical Subject Headings (MeSH) and text words related to first-episode psychosis, metabolic, cardiovascular, cancer and respiratory outcomes. The search terms for the physical disorders are adapted from previous publications on similar topics (Leucht et al., 2007; Onyeka et al., 2019). The search strategy was produced with the help of a librarian and follows the below structure:

First-episode psychosis terms AND metabolic outcomes OR cardiovascular outcomes OR cancer terms OR respiratory outcomes

The full search strategy can be found in Table 1.

Study selection

Studies will be deduplicated in Endnote and uploaded to Rayyan for screening. Two reviewers will independently undertake the screening process in two rounds: the first round will involve title and abstract screening, and the second round will focus on full-text screening. A third reviewer will resolve any discrepancies between the reviewers at each stage. We will check for overlapping cohorts by examining recruitment site, time frame, and researcher groups. If multiple publications arise from the same study population, we will include the most comprehensive data set.

Data extraction

Two reviewers will extract data independently according to a pre-piloted Microsoft Excel form. Discrepancies will be identified and resolved through discussion (with a third reviewer where necessary). Where study data is not reported (e.g., conference abstracts), authors will be contacted up to two times within a one-month period to request relevant data. If authors remain unresponsive, we will either proceed with analyses excluding the missing data or, if the absence critically impairs the study’s utility, exclude that study from meta-analyses and note it in sensitivity analyses. We will also collect data on average chlorpromazine equivalents or another standardized antipsychotic dosage measure when reported, to facilitate cross-study comparisons.

The extracted information will include authors, title, publication year, country, study design, data collection timeframe, setting, recruitment, inclusion/exclusion criteria, the number of participants, age, sex, ethnicity, psychosis diagnosis type, method of diagnosing, medication status, year of follow-up, method of diagnosing physical outcomes, prevalence/incidence estimates at baseline and at >0–12 months, or 13–36 months, or 37–60 months, or after more than 5 years after a FEP diagnosis, percentage smoking, comorbid mental disorders/substance abuse disorders, social deprivation measures, parental mental health history, covariates adjusted for, control group/comparator data, funding sources/conflicts of interest, and additional information. In the case of missing data, study investigators will be contacted for unreported data or additional details. Selected articles will be stored and managed using EndNote X9 Reference Manager Library.

Risk of bias in individual studies

Two reviewers will independently assess the risk of bias in included studies using the Joanna Briggs Institute (JBI) Critical Appraisal Checklist for Studies Reporting Prevalence Data (Munn et al., 2015). Disagreements between reviewers will be resolved by discussion with a third reviewer. This tool will help assess study quality based on criteria such as sample representativeness, reliability of outcome measurement, and appropriateness of statistical analysis. The results of this appraisal will inform sensitivity analyses, where we may exclude high-risk studies to assess their impact on pooled estimates.

Strategy of data synthesis

A narrative synthesis will be used to synthesise and summarise the findings and to explore relationships in the data. If two or more studies are available, a random-effects meta-analysis of prevalence with 95% confidence and prediction intervals will be calculated for studies investigating outcomes within the same disease category (metabolic, cardiovascular, cancer or respiratory outcomes) at >0–12 months, at 13–36 months, at 37–60 months, and after more than 5 years after a FEP diagnosis (e.g., one meta-analysis on FEP cohort studies at 13–36 month follow up reporting the prevalence of respiratory outcomes). We will also conduct meta-analyses on the prevalence of specific physical health outcomes that are reported on in two or more studies at 0–12 months, at 13–36 months, at 37–60 months, and after more than 5 years.

Heterogeneity between prevalence estimates will be assessed using the I2 statistic, Tau-squared, and prediction intervals. We will also generate Forest plots for the prevalence estimates and their 95% CI of the individual studies and pooled estimates. Forest plots will be examined visually, looking for potential outliers. We will conduct sensitivity analyses based on study quality and exclude studies at high risk of bias. Publication bias will be assessed with a funnel plot and the Begg and Egger tests.

Analysis of subgroups

Sensitivity analyses will be conducted for associations supported by previous literature or convincing evidence. The following factors will be considered: study design, study year, studies that adjusted for age/sex, studies that adjusted for smoking at baseline, studies that adjusted for BMI or obesity at baseline, studies that adjusted for physical activity levels at baseline; studies that adjusted for the presence of co-occurring mental disorders at baseline; studies that adjusted for exposure to childhood maltreatment at baseline; studies that adjusted for use of psychotropic medications/substances; studies sponsored by a pharmaceutical company, and studies that adjusted for general medical burden at baseline. We will also include additional variables such as social deprivation status and parental mental health history if reported.

A meta-regression analysis of moderators of interest will be conducted if there are more than 10 studies available on one specific illness (e.g., Metabolic syndrome) at one of the pre-specified time periods:

(a) Mean age

(b) Ethnicity

(c) Sex

(d) % smokers

(e) % taking antipsychotic medication

(f) % alcohol or substance use disorder

(g) Study year

(h) Social deprivation status

(i) Parental mental health history

Public and patient involvement and dissemination plans

One of the co-authors has lived experience of FEP and serves as an expert by experience, having actively contributed to formulating the protocol and shaping the research question. They will also be involved in interpreting the findings and co-creating dissemination materials. The completed review will be submitted to a leading journal in this field. Drawing from the insights of the review, we plan to create a recovery education module, informed by both the study findings and PPI feedback, to further support and inform patient groups. To make our findings accessible and comprehensible to a broader audience, a lay summary will be added to the review and disseminated to interested patient groups, with the continuous involvement of PPI to ensure its clarity and relevance.

Study status

The systematic review is currently at the stage of data extraction. Database searching and screening have been completed.

Discussion

Individuals with FEP experience significant health disparities, demonstrated by increased rates of premature mortality and a variety of physical comorbidities (Firth et al., 2019). This systematic review seeks to consolidate the existing knowledge on the prevalence of physical health comorbidities among this group.

An important focus of our review is the health trajectory from FEP onset to subsequent stages. Past reviews often group FEP with chronic psychosis, potentially masking the trajectory of physical health comorbidities (Leucht et al., 2007; Oud & Meyboom-de Jong, 2009). Our review dissects the prevalence of cardiovascular, metabolic, cancer, and respiratory comorbidities across varying post-diagnosis durations to provide a detailed health outlook for this cohort. We also consider pre-existing conditions physical health conditions, thus highlighting potential bi-directionality between FEP and physical multimorbidities. A key component of our review evaluates the influence of demographic variables on prevalence rates. Understanding these demographic nuances can aid in public service planning and preparedness, ensuring communities are better equipped to address these challenges. By only including studies with antipsychotic-naïve individuals with FEP, we aim to achieve a better appreciation of the baseline physical health changes after entering mental health services.

We also anticipate certain limitations in our review. The reported prevalence rates may not accurately represent the true prevalence of specific physical health disorders among individuals with FEP. Prior research has indicated that conditions like cancer tend to be diagnosed at more advanced stages compared to the general population (Wootten et al., 2022). Additionally, diagnostic overshadowing could further lead to underreporting physical health issues (Molloy et al., 2023; Shefer et al., 2014). We acknowledge that excluding personality disorders may limit the generalizability of our findings to individuals on the broader psychosis spectrum. Additionally, diagnostic differences (e.g., ICD-10 vs. ICD-11) and variation in how outcomes are measured may introduce heterogeneity in prevalence estimates, which we aim to address via subgroup or sensitivity analyses. We also note that many included studies are likely to be conducted in high-income countries, which can reduce the representativeness of the results in low- and middle-income contexts. Despite these potential limitations, the findings of this review will provide insights that can inform clinical practice and early intervention strategies

The findings can inform targeted interventions and timely management of metabolic, cardiovascular, respiratory, and oncologic risks, as well as highlight the need for embedding structured physical health assessments and integrated care strategies into early intervention services for FEP, informing. Future longitudinal research should evaluate the effectiveness of these approaches while examining genetic, lifestyle, and socioeconomic mechanisms underlying disparities in physical health outcomes.

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Zierotin A, Murphy J, O'Donoghue B et al. The short-, medium-, and long-term prevalence of physical health comorbidities in first-episode psychosis: a systematic review and meta-analysis protocol [version 2; peer review: 3 approved]. HRB Open Res 2025, 6:75 (https://doi.org/10.12688/hrbopenres.13810.2)
NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article.
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Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit.
Not approvedFundamental flaws in the paper seriously undermine the findings and conclusions
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Reviewer Report 23 Jan 2025
A Dregan, King's College London, London, England, UK 
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I am satisfied with the authors responses to my earlier concerns ... Continue reading
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Dregan A. Reviewer Report For: The short-, medium-, and long-term prevalence of physical health comorbidities in first-episode psychosis: a systematic review and meta-analysis protocol [version 2; peer review: 3 approved]. HRB Open Res 2025, 6:75 (https://doi.org/10.21956/hrbopenres.15441.r44661)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
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Reviewer Report 23 Jan 2025
Anna Waterreus, University of Western Australia, Crawley, Australia 
Approved
VIEWS 1
Thank you for asking me to review this revised study protocol for a systematic review and meta-analysis investigating the prevalence of physical health co-morbities over time in people in their first episode of psychosis.
This document clearly outlines the ... Continue reading
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Waterreus A. Reviewer Report For: The short-, medium-, and long-term prevalence of physical health comorbidities in first-episode psychosis: a systematic review and meta-analysis protocol [version 2; peer review: 3 approved]. HRB Open Res 2025, 6:75 (https://doi.org/10.21956/hrbopenres.15441.r44805)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
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Reviewer Report 10 Jan 2025
Luigi Francesco Saccaro, University of Geneva, Geneva, Switzerland 
Approved
VIEWS 2
The authors have addressed all comments appropriately, and I look ... Continue reading
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Saccaro LF. Reviewer Report For: The short-, medium-, and long-term prevalence of physical health comorbidities in first-episode psychosis: a systematic review and meta-analysis protocol [version 2; peer review: 3 approved]. HRB Open Res 2025, 6:75 (https://doi.org/10.21956/hrbopenres.15441.r44660)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
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Reviewer Report 10 Dec 2024
Luigi Francesco Saccaro, University of Geneva, Geneva, Switzerland 
Approved with Reservations
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GENERAL COMMENTS

This well-designed, preregistered protocol clearly outlines a systematic review and meta-analysis investigating the short-, medium-, and long-term prevalence of metabolic, cardiovascular, respiratory, and oncologic comorbidities in antipsychotic-naïve or minimally exposed individuals with FEP, aiming to ... Continue reading
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Saccaro LF. Reviewer Report For: The short-, medium-, and long-term prevalence of physical health comorbidities in first-episode psychosis: a systematic review and meta-analysis protocol [version 2; peer review: 3 approved]. HRB Open Res 2025, 6:75 (https://doi.org/10.21956/hrbopenres.15114.r43606)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
  • Author Response 08 Jan 2025
    Anna Zierotin, Department of Psychiatry, University College Dublin, Dublin, Ireland
    08 Jan 2025
    Author Response
    1. TITLE
    The title is appropriate, but I suggest including a reference to the potential meta-analysis.

    We thank the Reviewer for their comment. We have revised the manuscript title:
    ... Continue reading
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  • Author Response 08 Jan 2025
    Anna Zierotin, Department of Psychiatry, University College Dublin, Dublin, Ireland
    08 Jan 2025
    Author Response
    1. TITLE
    The title is appropriate, but I suggest including a reference to the potential meta-analysis.

    We thank the Reviewer for their comment. We have revised the manuscript title:
    ... Continue reading
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14
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Reviewer Report 14 Mar 2024
A Dregan, King's College London, London, England, UK 
Approved with Reservations
VIEWS 14
The work represents the protocol of a proposed study to synthesize current evidence on the link between FEP and antipsychotic drugs with a restricted number of major physical long-term conditions.The questions are well detailed and clear, and the search strategy ... Continue reading
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CITE
HOW TO CITE THIS REPORT
Dregan A. Reviewer Report For: The short-, medium-, and long-term prevalence of physical health comorbidities in first-episode psychosis: a systematic review and meta-analysis protocol [version 2; peer review: 3 approved]. HRB Open Res 2025, 6:75 (https://doi.org/10.21956/hrbopenres.15114.r38110)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
  • Author Response 08 Jan 2025
    Anna Zierotin, Department of Psychiatry, University College Dublin, Dublin, Ireland
    08 Jan 2025
    Author Response
    The work represents the protocol of a proposed study to synthesize current evidence on the link between FEP and antipsychotic drugs with a restricted number of major physical long-term conditions. ... Continue reading
COMMENTS ON THIS REPORT
  • Author Response 08 Jan 2025
    Anna Zierotin, Department of Psychiatry, University College Dublin, Dublin, Ireland
    08 Jan 2025
    Author Response
    The work represents the protocol of a proposed study to synthesize current evidence on the link between FEP and antipsychotic drugs with a restricted number of major physical long-term conditions. ... Continue reading

Comments on this article Comments (0)

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Comment
Alongside their report, reviewers assign a status to the article:
Approved - the paper is scientifically sound in its current form and only minor, if any, improvements are suggested
Approved with reservations - A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit.
Not approved - fundamental flaws in the paper seriously undermine the findings and conclusions

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