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The respiratory instability frequently observed in advanced heart failure (HF) is likely to mirror the clinical status of worsening HF. The present multicenter study was conducted to examine whether the noble respiratory stability index (RSI), a quantitative measure of respiratory instability, reflects the recovery process from HF decompensation. Methods and Results : Thirty-six of 44 patients hospitalized for worsening HF completed all-night measurements of RSI both at deterioration anddoi:10.1253/circj.cj-18-0519 fatcat:sovu3hc4ujbthhcatuqlqspxia