A heart failure patient underwent tests for exercise capacity and sleep issues both a year prior to and after heart transplantation (HTx), revealing persistent severe Cheyne-Stokes respiration (CSR) and central sleep apnea (CSA).
The study noted that while medication and improved blood flow did not eliminate the central causes of CSR and CSA, the problem of periodic breathing during exercise improved.
This suggests a complex interaction between exercise capacity and sleep breathing patterns, indicating that CSR and periodic breathing might not share the same root cause in this patient's situation.