Ischemic Pre-Conditioning is Present in Patients with Non-ST Elevation Myocardial Infarction and ECG Derived Moderate Obstructive Sleep Apnea.
Elizabeth Borczynski, Sukardi Suba, Lynda A Mackin and 4 others
PMID 37027135WHAT IT FOUND
Patients with heart attacks who screened positive for sleep apnea had lower peak troponin levels than those without sleep apnea.
This suggests a possible protective effect, but the study did not find a significant difference in ongoing heart ischemia.
Key findings
01Patients screened with moderate Holter Derived Respiratory Disturbance Index (HDRDI) had significantly lower peak troponin levels (6.8 ng/ml) compared to those without (10.2 ng/ml).
02There was no statistically significant difference in the frequency of transient myocardial ischemia events between the group with moderate HDRDI (16%) and the group without (30%).
STILL TO COME
How it was doneWhat they foundWhat it means for RNs
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What it does not show
The study used a novel, unvalidated ECG-derived method (HDRDI) to screen for sleep apnea instead of the gold-standard polysomnography, which may undercount apnea episodes. The sample size was small (110 patients), limiting the power to detect significant differences in secondary outcomes like transient ischemia. The HDRDI method cannot distinguish between obstructive and central sleep apnea. The study only looked at the early phase of acute coronary syndrome, so it is unclear if the apparent protective effect persists or if damage is merely delayed. The analysis was a secondary look at an observational study, not a randomized trial, so causality cannot be established.
The easy way to misread this
Do not interpret the lower troponin levels as proof that sleep apnea protects the heart. The study used an unvalidated screening tool, had a small sample size, and found no significant difference in ongoing ischemia, meaning the protective effect is a hypothesis requiring further research.