Sleep disordered breathing, especially central sleep apnea, is common in patients with chronic heart failure. Heart valve replacement could have some effect on central sleep apnea. The aim of the study is to investigate effect of heart valve replacement on Cheyne-Stokes respiration in patients with rheumatic heart disease.
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Changes of CSR index before and 3, 6, 12 months following valve replacement.
Timeframe: 1 year after cardiac surgery of each enrolled patient