Abstract
Sleep-disordered breathing (SDB) is characterized by repeated breathing pauses during sleep. The prevalence of SDB varies widely between studies. Some longitudinal studies have found an association of SDB with incident or recurrent cardiovascular events. We sought to systematically describe the current data on the correlation between SDB and cardiovascular pathology. Studies were included if they were original observational population-based studies in adults with clearly diagnosed SDB. The primary outcomes include all types of cardiovascular pathology. We carried out pooled analyses using a random effects model. Our systematic review was performed according to the PRISMA and MOOSE guidelines for systematic reviews and was registered with PROSPERO. In total, 2652 articles were detected in the databases, of which 76 articles were chosen for full-text review. Fourteen studies were focused on samples of an unselected population, and 8 studies were focused on a group of persons at risk for SDB. In 5 studies, the incidence of cardiovascular pathology in the population with SDB was examined. In total, 49 studies described SDB in patients with cardiovascular pathology. We found an association between SDB and prevalent /incident cardiovascular disease (pooled OR 1.76; 95% CI 1.38–2.26), and pooled HR (95% CI 1.78; 95% CI 1.34–2.45). Notably, in patients with existing SDB, the risk of new adverse cardiovascular events was high. However, the relationship between cardiovascular disease and SDB is likely to be bidirectional. Thus, more large-scale studies are needed to better understand this association and to decide whether screening for possible SDB in cardiovascular patients is reasonable and clinically significant.
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Introduction
Sleep-disordered breathing (SDB) is characterized by repeated breathing pauses during sleep1. According to the American Academy of Sleep Medicine (AASM), the main types of respiratory events are obstructive apnea or hypopnea, central apnea and mixed apnea2. A respiratory event is scored as an apneic episode if it meets the following criteria: a drop of the oronasal flow ≥90%, the duration of the event is over 10 s, and it is associated with continued inspiratory effort2. In obstructive hypopnea, the duration of the ≥30% drop in oronasal flow lasts ≥10 s and is associated with ≥3% oxygen desaturation from a pre-event baseline or with an arousal2. The event is defined as central if it meets apnea criteria and is associated with a lack of inspiratory effort2. If the event meets the apnea criteria and is associated with a lack of inspiratory effort at the beginning of the event, followed by resumption of inspiratory effort in the second portion of the event, it is classified as mixed apnea2. In the AASM guidelines, there are three additional types of respiratory events that are less prevalent: respiratory effort-related arousals (RERA), hypoventilation and periodic breathing. SDB is labeled as mild, moderate or severe based on the number of apnea and/or hypopnea episodes per hour of sleep, known as the apnea-hypopnea index (AHI)3. The prevalence of SDB varies widely because of the heterogeneity of the study methodology, different diagnostic standards (full polysomnography or portable sleep monitoring) and different AHI cut-offs. The prevalence of SDB has been reported to range between 17 and 49% for AHI ≥ 54,5 and between 4.6 and 43.7% for AHI ≥ 156,7.
Some longitudinal studies have found an association of SDB with incident or recurrent cardiovascular events: heart failure, myocardial infarction, stroke/transient ischemic attack8,9,10,11,12. Previous studies7,13,14 have shown that there is a dose-response relationship between the severity of SDB and the risk of various clinical manifestations of cardiovascular disease (CVD). These studies were conducted predominantly in cardiology patients or patients with an established diagnosis of SDB. Only a few studies focusing on this association in an unselected population have been published14,15,16.
SDB influences CVD through numerous pathophysiological mechanisms. The most likely causal pathway through which SDB causes CVD is thought to be intermittent hypoxia, endothelial dysfunction and inflammation, repetitive arousal from sleep, large intrathoracic pressure variations and increased sleeping blood pressure17,18,19. While the acute, unfavorable effects of sleep disorders on cardiovascular physiology have been well characterized, less research is available on how strong the effect of SDB is on symptomatic CVD. Previous systematic reviews were mostly based on a particular type of cardiovascular pathology or cardiovascular outcome20,21,22.
The main objective of this systematic review is to systemize the current data on the association between SDB and cardiovascular pathology.
Methods
Search question and search strategy
Our systematic review was performed according to the PRISMA and MOOSE guidelines for systematic reviews23,24. A systematic literature review was added to the PROSPERO register (registration number is CRD42018082314).
A ‘PACO’ (Patient-Type of Association-Comparison-Outcome) analogous to the ‘PICO’ (Patient-Intervention-Comparison-Outcome) for systematic reviews of interventional studies, was created to guide our systematic review of observational studies.
Our basic aim was to review the association between SBD and prevalent and/or incident CVD. Our research question was further operationalised as: (P) Patients with a documented SBD (A): cross-sectional or longitudinal associations (C) Persons without SBD, (O) Prevalent/incident CVD.
Since we aimed to investigating the association between SBD and CVD in a bidirectional way, we decided to search for complementary studies that investigated the prevalence and/or incidence of SBD in patients with an established CVD.
The search was made in PubMed, Ovid and EMBASE databases in February 2022 without limitations on language, publication year or country. The search strategy included only terms relating to or describing the association of SDB and cardiovascular pathology. The search terms were adapted for use with bibliographic databases separately and in combination with database-specific filters.
The search terms were obstructive sleep apnea syndrome, obstructive sleep apnea, sleep apnea, obstructive sleep apnea hypopnea syndrome, sleep-disordered breathing, heart failure, cardiac insufficiency, heart insufficiency, atrial fibrillation, cerebral vascular accident, stroke and myocardial infarction.
The identified articles were screened by title and abstract and selected for full text review if they met the following inclusion criteria developed according to the objectives of the review.
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(1)
Original observational (including cross-sectional, cohort and case–control studies) that were population-based and concerned the adult population.
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(2)
Studies in hospital cardiovascular departments, in sleep centers and studies of unselected populations.
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(3)
The diagnosis of SDB was based on the apnea-hypopnea index or respiratory disturbance index (RDI), which were obtained by the gold standard for diagnosing full polysomnography or portable home sleep apnea testing2.
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(4)
The primary outcome concerned the following types of cardiovascular pathology: heart failure, cardiovascular disease, coronary heart disease, atrial fibrillation, stroke, myocardial infarction.
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(5)
A diagnosis of cardiovascular pathology was based on the clinical evidence, laboratory data and/or functional methods of examination.
Exclusion criteria.
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(1)
Studies on children and pregnant women.
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(2)
The diagnosis of SDB was based on a questionnaire or ICD-9 diagnosis code.
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(3)
If only risk factors for CVD were studied as an outcome.
Data extraction
Titles and/or abstracts of studies retrieved by the search strategy were screened independently by two reviewers (AH and EA) to identify studies that potentially met the inclusion criteria. The full text versions of these potentially eligible studies were retrieved and independently assessed for eligibility by two review team members. Any disagreement between them over the eligibility of studies was resolved through discussion with a third reviewer (JD). A standardized form was used to extract data from the included studies for assessment of study quality and evidence synthesis. Extracted information included study setting; study population and participant demographics and baseline characteristics; study design and methodology; type of SDB and cardiovascular pathology; observation time, if possible; and results (prevalence in percentage, odds ratios and hazard ratios, if possible). Two reviewers extracted data independently; discrepancies were identified and resolved through discussion (with a third author when necessary). Missing data were requested from study authors.
Quality assessment
Two reviewers (AH and EA) independently assessed the methodological quality of the selected studies with the Quality Assessment Tool for Case-Control, Cohort and Cross-sectional Studies, depending on the study design (https://www.nhlbi.nih.gov/health-topics/study-quality-assessment-tools).
Statistical analysis
We looked at data from cross-sectional studies and cohort studies separately to estimate the effect of SDB on the risk of cardiovascular pathology. We collected multivariable-adjusted (if possible) hazard ratios (HR) or odds ratios (OR) from the original studies. When a study did not report the OR of the outcomes of interest, we calculated an unadjusted OR based on the original data of events. We performed random effects analysis to quantify the dispersion of effect sizes in a meta-analysis. We pooled the HR and OR separately with a 95% confidence interval (CI) for adverse cardiovascular outcomes within a random effects model (DerSimonian-Laird) that incorporates between-study heterogeneity. The Cochran Q test (at a significance level of p < 0.10) and the I2 statistic were used to examine statistical heterogeneity across studies. We planned to assess publication bias using visual evaluation of the funnel plots. All analyses were performed with Cochrane Review Manager software (version 5.3).
Reporting summary
Further information on research design is available in the Nature Research Reporting Summary linked to this article.
Results
Study selection and characteristics
Using the above-mentioned search terms, 2681 articles were selected from the PubMed, Ovid and EMBASE databases after deduplication. We excluded 2535 articles for the following reasons: did not relate to the correlation of SDB and cardiovascular pathology (n = 2516); were literature reviews (n = 17) and were systematic reviews (n = 2). One hundred forty-six articles were eligible for full text evaluation. Of these articles, 7 were not diagnostic, 1 was performed on a very select population (combination of atrial fibrillation and erectile dysfunction), 3 were on patients with both CVD and SDB, in 23 the diagnostic standard for SDB was not used, in 27 there were no clinical diagnoses of CVD made, and 7 did not contain full texts. In 86 out the 2681 initially screened studies disagreement between reviewers appeared around their eligibility; After discussion with a third reviewer 2534 were excluded. After reviewing the full text articles no further disagreement emerged. Seventy-nine articles were eligible based on the aforementioned criteria. Some studies were excluded for more than one reason.
Fourteen studies were performed on samples of an unselected population, and eight were performed on a group of persons at risk for SDB. In five studies, the incidence of cardiovascular pathology in the population with SDB was examined. Forty-nine studies described SDB in patients with cardiovascular pathology. The flow chart of the literature search is shown in Fig. 1. A total 38 studies were cross-sectional, 33 studies were cohort studies, and 5 studies were case-controls. The characteristics of the studies grouped by type of population are listed in Tables 1 to 5.
SDB was assessed by overnight polysomnography in 51 studies and by validated portable diagnostic devices in 28 others. All studies screened their study populations for SDB prior to the outcomes being obtained.
The definition of SDB was based on a standardized assessment of AHI in all studies except one, where RDI was used7. The AHI cut-off value varied across studies from 5 to 51. In most studies, AHI ≥ 15 was used as the cut-off value for moderate-to-severe SDB.
The median follow-up duration for cohort studies and case-controls was from 6 months to 24 years. The number of patients varied between 28 and 30719, with a mean age range from 47 ± 8 to 76.3 ± 5.5 years. We did not consider whether SDB was treated during the study period. Most of the studies reported adjusted risk estimates for the primary endpoint. The potential confounding factors were age, sex, body mass index, hypercholesterolemia, hypertension, diabetes, smoking and others. In studies when authors reported both the unadjusted and adjusted risk, we used only the adjusted risk for the pooled analysis.
The types of cardiovascular pathology studied were atrial fibrillation, coronary artery disease, coronary heart disease, heart failure, myocardial infarction, resistant hypertension, transient ischemic attack (TIA) and stroke. Longitudinal studies assessed adverse cardiovascular outcomes and all-cause mortality.
Quality assessment
Supplementary Table 1 reports the evaluation of each item from the Quality Assessment Tool for Studies (see Supplementary Information file). The quality of the reports was heterogeneous, with scores between 4–9 for cross-sectional studies, 8–12 for cohort studies and 7–10 for case-controls. In many reports, several items were missed, such as a sample size justification and power description, a definition of the potential risk of bias and a description if the outcome assessors were blinded to the exposure status of the participants.
Association of SDB and CVD in an unselected population
Fourteen studies with 27718 participants (the mean age ranged from 47 to 76.3 years) were included in the meta-analysis to explore the associations of SDB with CVD in a general unselected population4,5,7,13,14,15,16,25,26,27,28,29,30,31 (Table 1). Due to the clinical and statistical heterogeneity of the studies, their reported risk ratios could not be pooled into a meta-analysis into investigate the power of association. Nine studies provided adequate information on the HR and eight on the OR; they were included in two separate pooled analysis. Analyzing relative risks, we found that SDB was significantly associated with the risk of cardiovascular pathology in the general unselected population (overall HR 1.78; 95% CI 1.34–2.35), and the values of the HR varied from 1.10 to 4.20. Evidence of moderate between-study heterogeneity was found (I2 = 72%, p < 0.000, Fig. 2). After pooling the ORs, we found a similar association (overall OR 1.76; 95% CI 1.38–2.26, I2 = 66%, p < 0.000, Fig. 3) with a minimum OR of 1.23 and maximum OR of 3.83.
Association of SDB and CVD in a population at risk of sleep apnea
Eight studies32,33,34,35,36,37,38,39 were performed in patients with a high probability of having SDB. Six of the studies reported the HR, and three of the studies reported the OR; they were included in a separate pooled analysis (Table 2). SDB was also found to be associated with comorbid cardiovascular pathology in the random effects analysis (overall HR 1.49; 95% CI 1.15–1.93; overall OR 2.62; 95% CI 2.09–3.16). There was moderate evidence of between-study heterogeneity for the HR (I2 = 74%, p = 0.003, Fig. 4) and no evidence of heterogeneity for the OR (I2 = 11%, p < 0.000, Fig. 5).
The prevalence and risk of SDB in patients with an established CVD diagnosis
We included fifty one studies8,9,10,12,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85, in patients with various cardiovascular pathology in our review (Tables 3 and 4). The prevalence of SDB reported in these studies varied widely. Overall, SDB measured as AHI > 5 events/h ranged from 19%43 to 93.4%54. At the clinically important AHI level over 15 events/h, the prevalence of SDB in cardiovascular patients varied from 37.9%56 to 65.7%47. The highest prevalence was found in patients with myocardial infarction47, coronary artery disease61 and atrial fibrillation54. The incidence of major adverse events was significantly higher in cardiovascular patients with comorbid SDB than in those with only CVD (HR ranged from 1.029 to 11.0844. Due to the clinical heterogeneity of the studies of various cardiovascular diseases, their reported prevalence and power of association could not be compared.
The risk of CVD in patients with an established SDB diagnosis
We found five studies11,86,87,88,89 in patients with SDB (Table 5). In patients with established SDB diagnoses according to the validated instrumental measurement, there was a high risk for the incident cardiovascular events of different kinds. The results could not be pooled due to the important clinical heterogeneity.
Publication bias
It was difficult to assess for publication bias due to the low number of studies in each subgroup. We tested for evidence of publication bias based on visual inspection of the funnel plot (Supplementary Figs. 1–3). There was no evidence of publication bias for the association of SDB and CVD in the general population (HR and OR). However, the funnel plot was asymmetrical for the association of SDB and CVD in the population at risk. We could therefore not rule out publication bias.
Discussion
Our main finding was that SDB was strongly associated with CVD. In the general population as well as in patients with an already diagnosed cardiovascular pathology, the presence of SDB significantly increases the risk of adverse cardiovascular outcomes and all-cause mortality. Considering the higher prevalence of SDB in cardiovascular patients (up to 93–96%54,57) and the higher risk of adverse cardiovascular events, it may be reasonable to screen for possible SDB in cardiovascular patients.
Our results suggest that the presence of SDB increases the risk of cardiovascular events 1.5 times in the general population and 2.6 times in the population at risk. The prevalence of OSA90 in the general population, as well as the correlation between OSA and risk of certain cardiovascular events, has already been established in earlier reviews20,21,22. In the general population, OSA was significantly associated with stroke and IHD. However, these literature reviews presented data only on one type of SDB and studied a particular type of cardiovascular pathology as an outcome and/or the risk in patients with preexisting cardiovascular pathology. In contrast, the present meta-analysis focused on all types of cardiovascular pathology and SDB. Regarding adverse cardiovascular outcomes and mortality, our results were consistent with those reported in the general population20,91. However, due to the methodological and clinical heterogeneity of the studies, the results could not be pooled in most of the meta-analyses.
In our review, we found that in patients with established cardiovascular pathology, SDB significantly increased the risk of new adverse cardiovascular events (up to 3.58 times). The results are consistent with other recent literature reviews and meta-analyses, with four-fold higher odds for AF92 and a threefold higher risk for ischemic stroke93. We did not find a high-quality meta-analysis on other types of cardiovascular pathology.
The pathophysiological mechanisms of SDB and associated cardiovascular risk are complex and vary between patients. Obstructive and central apnea may induce severe intermittent hypoxemia and CO2 retention during sleep, with oxygen saturation sometimes dropping to 60%, disrupting the normal structured autonomic and hemodynamic responses to sleep94. Apnea occurs repetitively through the night and is accompanied by increases in sympathetic activity to peripheral blood vessels and consequent vasoconstriction95. Nocturnal apnea initiates a range of pathophysiological mechanisms that may act to promote cardiac and vascular disease. These mechanisms include sympathetic activation, oxidative stress, cardiovascular variability, increased release of vasoactive and trophic substances, inflammation, endothelial dysfunction and thrombosis96. Thus, sleep apnea may initiate, promote, or exacerbate hypertension, coronary artery disease, arrhythmias, stroke, and heart failure97. Compared with the general population, the prevalence of SDB is higher in patients with cardiovascular conditions, such as hypertension (33–83%57,73), heart failure (40–61%78,81), atrial fibrillation (67–93.4%54,72), and stroke (63–92%65,71). However, the coexistence of these conditions with SDB does not prove causality, and potential confounding variables may intervene.
In the European Society of Cardiology Guidelines for the management of atrial fibrillation98, it is recommended that all AF patients be interrogated for symptoms and clinical signs of OSA. In addition, the treatment of an associated OSA should be optimized to reduce AF recurrences and improve AF treatment results (class of recommendation IIa). In addition, the updated Guideline for the Management of Heart Failure (American College of Cardiology/American Heart Association)99 stated that in patients with NYHA class II–IV HF and suspicion of SDB or excessive daytime sleepiness, a formal sleep assessment is reasonable (class of recommendation IIa). Thus, it is necessary to screen for possible SDB in patients with severe associated cardiovascular pathology, although the evidence of treatment benefits is still scarce.
This is the first comprehensive systematic review of the literature on the association between SDB and all kinds of cardiovascular pathology in adults in all regions of the world. Previous systematic reviews were limited to certain types of CVD or SDB or to selected populations.
The most significant strength of our systematic review is that we included both types of studies: those that measured the association in an unselected general population (or age-/sex-specific subgroups) and in a population at risk of SDB; and those that focused on a select population (with suspected sleep disorder or with diagnosed CVD). We included studies in which sleep apnea was measured using standard objective procedures.
Due to heterogeneity across studies and outcomes, there was a limited scope for conducting a meta-analysis. We have generally relied on adjusted data, but in some reports, risk indices were not adjusted for traditional risk factors or were adjusted for only some risk factors. We realize that confounding and differences in patient selection comprise a possible source of bias. Another limitation is that the range of AHI cut-off values varies across studies. Unfortunately, it was not possible to conduct separate subgroup meta-analyses for the associations between SDB severity (i.e., mild, moderate, and severe, according to AHI) and cardiovascular outcomes because of small sample sizes. When data concerning SDB severity were reported, we included in the pooled analysis the HR and OR related to the most severe forms of SDB (i.e., those with the highest AHI cut-off value).
In conclusion, we found an association between sleep-disordered breathing and cardiovascular disease. Notably, in patients with existing SDB pathology, the risk of new adverse cardiovascular events is high. However, the relationship between CVD and SDB is likely to be bidirectional. Thus, more large-scale studies are needed to better understand this association and to decide whether screening for possible SDB in cardiovascular patients is indicated and clinically relevant.
Data availability
The search concepts are available in the supplement.
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Study design: A.H., J.D. Literature search: A.H., E.A., and J.D. Data interpretation: A.H., E.A., and J.D. Manuscript writing: A.H. Critical review of the manuscript for important intellectual content: E.A., and J.D. All authors read and approved the final manuscript.
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Khokhrina, A., Andreeva, E. & Degryse, JM. A systematic review on the association of sleep-disordered breathing with cardiovascular pathology in adults. npj Prim. Care Respir. Med. 32, 41 (2022). https://doi.org/10.1038/s41533-022-00307-6
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DOI: https://doi.org/10.1038/s41533-022-00307-6
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