Incremental Value of Left Ventricular Diastolic Function Reserve Index for Predicting Exercise Capacity in Patients with Hypertrophic Cardiomyopathy

Eui Young Choi, Jong Won Ha, Se Joong Rim, Sung Ai Kim, Se Jung Yoon, Chi Young Shim, Jin Mi Kim, Yangsoo Jang, Namsik Chung, Seung Yun Cho

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The changes of left ventricular diastolic function during exercise are heterogeneous in patients with hypertrophic cardiomyopathy (HCM). We sought to investigate whether exertional changes of mitral annular velocities and plasma N-terminal-pro-B-type natriuretic peptide (BNP) concentration are associated with exercise capacity in patients with HCM. After a comprehensive echocardiographic study, 32 patients with HCM performed symptom-limited graded supine bicycle exercise. Echocardiographic Doppler parameters were measured at each stage of exercise. Blood samples were collected at rest and immediately after exercise to determine the concentration of pro-BNP. Resting pro-BNP (r = -0.620, P < .001), E'base (r = 0.414, P = .018), and ΔE'50W (change of E' from base to 50 W of exercise) (r = 0.367, P = .039) were significantly correlated with exercise duration. Left ventricular longitudinal diastolic function reserve index, defined as ΔE' × E'base, significantly correlated with exercise duration (at 50 W, r = 0.540, P = .001) independent of age, sex, body mass index, and resting pro-BNP level. When combining ΔE' × E'50W (<5.85 cm2/s2) and resting pro-BNP (>740 mg/dL), the predictive accuracy for exercise capacity could be improved (for <500 seconds, global χ2 = 5.84 in pro-BNP vs 8.10 in pro-BNP + ΔE' × E'50W, P = .023). The assessment of left ventricular longitudinal diastolic function reserve can provide incremental information to pro-BNP for the prediction of exercise capacity in patients with HCM.

Original languageEnglish
Pages (from-to)487-492
Number of pages6
JournalJournal of the American Society of Echocardiography
Issue number5
Publication statusPublished - 2008 May 1


All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging
  • Cardiology and Cardiovascular Medicine

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