Title
Rethinking Preoperative Cardiac Testing in Children With Very Severe Obstructive Sleep Apnea: Low Yield, High Stakes, and a More Selective Path Forward
Highlights
In a retrospective cohort of 144 children with very severe obstructive sleep apnea (OSA) undergoing adenotonsillectomy, only 26.4% received a preoperative cardiac workup, and abnormal findings were uncommon.
Three of 38 children tested (7.9%) had abnormal cardiac findings; all were obese adolescents aged 13 to 16 years with preoperative apnea-hypopnea index (AHI) greater than 50 events per hour.
Preoperative cardiac workup was not associated with improvement in OSA severity or with perioperative course, while higher preoperative AHI and younger age were associated with longer hospital length of stay.
The study supports a more selective cardiopulmonary evaluation strategy before adenotonsillectomy in children with very severe OSA, especially targeting obese adolescents with extreme AHI elevation.
Study Background
Obstructive sleep apnea is a common and clinically important disorder in children, characterized by recurrent upper airway obstruction during sleep, intermittent hypoxemia, sleep fragmentation, and downstream effects on neurocognitive performance, behavior, cardiovascular physiology, and quality of life. Adenotonsillectomy remains the first-line treatment for most pediatric patients, including many with severe disease.
Very severe OSA raises additional concern because prolonged nocturnal hypoxemia and elevated respiratory effort can contribute to cardiopulmonary stress. In practice, clinicians sometimes obtain preoperative cardiac evaluation—typically echocardiography and related workup—to look for pulmonary hypertension, right ventricular strain, or other cardiac consequences of chronic sleep-disordered breathing. However, the true diagnostic yield of routine testing in children with very severe OSA has been uncertain, and unnecessary testing can increase cost, delay surgery, and add burden for families.
This study addresses a practical question with direct perioperative relevance: among children with very severe OSA undergoing adenotonsillectomy, how often does preoperative cardiac workup reveal actionable abnormalities, and does it meaningfully affect management or outcomes?
Study Design
The investigators performed a retrospective review of children aged 2 to 18 years with very severe OSA, defined as an apnea-hypopnea index of at least 25, who underwent adenotonsillectomy between 2018 and 2024. The main exposure was receipt of a preoperative cardiac workup. The study evaluated associations between demographic features, polysomnography parameters, cardiac testing, and hospital length of stay using Wilcoxon rank-sum and Spearman correlation analyses.
The central clinical outcomes were the prevalence of abnormal cardiac findings, whether those findings triggered additional testing or preoperative intervention, and whether preoperative cardiac workup correlated with postoperative course, including length of stay and improvement in OSA severity.
Key Findings
Among 144 children with very severe OSA, 38 patients (26.4%) underwent a preoperative cardiac workup. This proportion suggests that cardiac testing was used selectively rather than universally, likely reflecting clinician concern in higher-risk patients.
Only 3 of the 38 tested children (7.9%) had abnormal findings. Importantly, these three patients shared a similar clinical profile: all were obese, all were adolescents aged 13 to 16 years, and all had preoperative AHI greater than 50 events per hour. This clustering is clinically meaningful because it suggests that the highest diagnostic yield may be concentrated in a narrower subset of patients rather than across the broader population of children with very severe OSA.
Despite the abnormal findings, none of the three patients underwent additional testing or were started on continuous positive airway pressure (CPAP) before surgery. That observation implies that the abnormalities were either mild, nonactionable, or not judged to warrant immediate perioperative management changes. In practical terms, this reduces the evidence for routine cardiac workup as a tool that changes short-term treatment decisions in most children.
There was no association between preoperative cardiac workup and improvement in AHI, obesity, sex, or age. This likely reflects the fact that cardiac testing does not alter the underlying airway obstruction that adenotonsillectomy is intended to treat. More importantly, cardiac workup did not appear to enrich for measurable perioperative benefit in this cohort.
In contrast, the severity of OSA and patient age did relate to hospital utilization. Higher preoperative AHI correlated with longer length of stay (p = 0.040, Spearman rho = 0.17), and younger age also correlated with longer length of stay (p = 0.0007, rho = -0.28). Although the correlation coefficients were modest, the directionality is clinically plausible: more severe respiratory disease may warrant closer postoperative observation, and younger children may be admitted more conservatively or recover more slowly.
These findings help disentangle two separate issues that are often conflated in perioperative planning. First, very severe OSA itself predicts a more cautious postoperative course. Second, preoperative cardiac workup does not appear to substantially alter that course for most patients. That distinction matters when deciding whether testing should be routine, selective, or reserved for specific high-risk phenotypes.
Interpretation and Clinical Relevance
The main message from this study is not that cardiac complications are irrelevant in pediatric very severe OSA, but rather that preoperative cardiac testing has a low yield when applied broadly. The abnormalities detected were confined to a subgroup with a particularly high-risk profile: obese adolescents with extreme AHI elevation. This pattern supports a risk-stratified approach rather than universal screening.
From a perioperative standpoint, adenotonsillectomy for very severe OSA already requires thoughtful airway and respiratory planning. Many centers rely on polysomnographic severity, oxygen nadir, carbon dioxide retention, age, obesity, comorbidities, and clinical symptoms to determine postoperative monitoring needs. The present study suggests that cardiac workup adds limited incremental value for most children beyond what can be inferred from sleep study severity and clinical phenotype.
That said, selective cardiac evaluation may still be justified in adolescents with obesity and very high AHI, particularly when polysomnography shows profound desaturation, hypercapnia, or other features concerning for cardiopulmonary strain. In these patients, echocardiography could help identify pulmonary hypertension or right heart effects that might influence anesthesia planning, postoperative monitoring intensity, or specialist referral. The study’s results therefore argue for refinement, not abandonment, of cardiopulmonary assessment.
Strengths of the Study
This analysis is clinically grounded and addresses a question that affects everyday surgical decision-making. The inclusion of real-world patients over a 6-year period enhances relevance to contemporary practice. The focus on very severe OSA is also important, because this is the subgroup most likely to raise concern about occult cardiopulmonary disease.
Another strength is the attempt to relate testing patterns to actionable outcomes rather than simply reporting prevalence. In perioperative medicine, testing only matters if it changes management or improves outcomes. By showing that abnormal findings were uncommon and did not trigger additional preoperative intervention, the study directly informs utility.
Limitations and Caution in Interpretation
Because this was a retrospective review, the decision to order cardiac workup was likely influenced by clinician judgment and unmeasured clinical factors. This introduces selection bias: the tested group may have been sicker or more suspicious for cardiac involvement than the untested group, making it difficult to estimate the true prevalence of abnormal findings in all children with very severe OSA.
The study also does not specify how “abnormal findings” were defined in detail in the abstract, nor does it clarify the downstream clinical significance of those findings. Mild echocardiographic abnormalities do not necessarily equate to clinically meaningful disease. Similarly, the lack of preoperative CPAP initiation after abnormal results may reflect local practice patterns rather than the universal absence of an intervention threshold.
Another important limitation is that long-term outcomes were not emphasized. It remains possible that identifying subtle cardiopulmonary abnormalities could matter over a longer horizon, even if it did not change immediate perioperative management. Finally, the study reflects a single practice context and may not generalize to centers with different thresholds for echocardiography, different patient demographics, or greater prevalence of complex comorbid disease.
How This Fits With Current Practice
Current pediatric OSA management already emphasizes risk stratification around severity, obesity, age, and gas-exchange abnormalities. This study aligns with that framework by suggesting that the highest-yield candidates for cardiac workup are obese adolescents with very severe AHI elevation, rather than all children meeting a severity threshold alone.
For clinicians, the practical takeaway is to reserve cardiac testing for children in whom the pretest probability of cardiopulmonary involvement is higher. Possible triggers may include marked nocturnal desaturation, hypercapnia, symptoms of exercise intolerance, signs of right heart strain, obesity hypoventilation concerns, or a particularly high AHI, especially above 50 events per hour. A blanket policy of routine echocardiography for every child with AHI at least 25 appears difficult to justify on the basis of these data.
Conclusion
In children with very severe OSA undergoing adenotonsillectomy, preoperative cardiac workup had a low diagnostic yield and did not appear to alter perioperative management or outcomes in most cases. The abnormalities that were detected clustered in obese adolescents with AHI greater than 50 events per hour, suggesting that selective testing may be more efficient and clinically sensible than routine screening.
For practice, the study supports a narrower, phenotype-based approach to preoperative cardiopulmonary evaluation. For research, prospective studies are needed to define which combinations of age, obesity, polysomnographic severity, gas-exchange abnormalities, and clinical symptoms best predict actionable cardiac disease and whether targeted testing improves outcomes, reduces cost, and shortens time to surgery.
Funding and ClinicalTrials.gov
Funding details were not provided in the abstract. No ClinicalTrials.gov registration was reported; this appears to be a retrospective observational study rather than a registered interventional trial.
References
1. Elias DA, Shaffer AD, Bennett Z, Whelan R. Utility of Preoperative Cardiac Workup for Children With Very Severe Obstructive Sleep Apnea. The Laryngoscope. 2026-06-15. PMID: 42298976.
2. Marcus CL, Brooks LJ, Draper KA, et al. Diagnosis and management of childhood obstructive sleep apnea syndrome. Pediatrics. 2012;130(3):576-584.
3. American Academy of Pediatrics. Clinical practice guideline: diagnosis and management of childhood obstructive sleep apnea syndrome. Pediatrics. 2012;130(3):576-584.
4. Kaditis AG, Alonso Alvarez ML, Boudewyns A, et al. Obstructive sleep disordered breathing in 2- to 18-year-old children: diagnosis and management. Eur Respir J. 2016;47(1):69-94.
5. Waters KA, Sitha S, O’Brien LM, et al. Polysomnographic predictors of persistent sleep apnea after adenotonsillectomy in children. Sleep. 2004;27(8):1504-1511.
AI Image Prompt
A pediatric sleep medicine and ENT clinic scene showing an adolescent with obesity undergoing preoperative evaluation for obstructive sleep apnea, with a polysomnography monitor displaying severe AHI results, a clinician reviewing an echocardiogram on a tablet, and a calm hospital setting; clean, realistic medical illustration, high detail, professional tone.