A recent NIMHANS study indicates that a significant portion of severe sleep apnea in stroke patients improves over time, suggesting it may largely be a consequence of the stroke rather than a cause. The findings highlight the importance of evaluating sleep disorders in stroke patients, as untreated sleep apnea could be a modifiable risk factor for future strokes.

A recent study conducted by researchers at NIMHANS has shed light on the complex relationship between sleep apnea and stroke. It indicated that a significant portion of severe sleep apnea cases may improve over time, suggesting it is often a consequence of stroke rather than a primary cause. Funded by the Indian Council of Medical Research (ICMR), the findings are set to be published in the Annals of the Indian Academy of Neurology.

The study evaluated 105 ischemic stroke patients over 50 years old, using polysomnography to assess sleep-disordered breathing and arousals within one month of their stroke and again three months later. Initial results showed that 88% of patients had sleep apnea, with 38% experiencing severe cases. However, follow-up assessments revealed a drop to 26% and 12% for sleep apnea and severe sleep apnea, respectively. 

The lead author, Dr. P.R. Srijithesh, noted a notable improvement in sleep abnormalities, emphasizing the need for continued research on sleep patterns in stroke patients. Experts recognized snoring as a significant risk factor for stroke, linking episodes of breathing pauses during sleep to decreased oxygen levels, which can damage the brain and increase stroke risk.

(Source:https://www.thehindu.com/sci-tech/health/world-stroke-day-nimhans-study-finds-part-of-sleep-apnea-burden-is-a-consequence-of-stroke/article68807291.ece )