Abstract
Objective: Exercise intolerance in patients with heart failure with preserved ejection fraction (HFpEF) is most often attributed to diastolic dysfunction (DD); however, chronotropic incompetence (CI) could also play an important role. We intended to examine whether there are predictive echocardiographic parameters of DD for impaired chronotropic response to exercise.
Methods and Results: Patients (n = 143) with unexplained dyspnea and/or exercise intolerance who fulfilled clinical and echocardiographic criteria of HFpEF presence underwent a symptom-limited exercise test using a treadmill (ETT) according to the Bruce protocol. CI was defined as an achieved heart rate reserve (HRR) of ≤ 80%. Comparison of the groups with (n = 98) and without CI (n = 45) did not show any statistically significant difference regarding demographic and clinical character-ristics except for use of beta blockers (BB) that were more frequently present (p = 0.012) in patients with CI in comparison with those without. Patients with CI had a higher mean E-wave velocity, E/A ratio, increased E/E‵ septal, lateral as well as average ratio and abnormal IVRT/TE-e‵ index all consistent with elevated LV filling pressures. E/E‵ average ratio > 15 was statistically insignificantly more frequently present in patients with CI. In addition, by multivariate stepwise regression analysis value of E‵ septal (β = 3.697, 95%CI 0.921–6.473, p = 0.009) along with use of BB, current smoking and basal heart rate appeared as statistically significant independent predictors of lower HRR %.
Conclusion: Patients with HFpEF frequently have chronotropic incompetence to graded exercise which may partly be predicted with echocardiographic parameters that are consistent with elevated LV filling pressures.
Prognostic value of GDF levels 15 and NTproBNP and echocardiographic parameters in patients with heart failure with preserved ejection fraction, after myocardial infarction on the background of hypertension according to the three-year observation
