Objective To investigate clinical outcomes of exercise-induced pulmonary hypertension (PH) and implications of an increase in left ventricular (LV) filling pressure during exercise in subjects with preserved LV ejection fraction.
Design Longitudinal follow-up study.
Setting Subjects who were referred for diastolic stress echocardiography.
Patients and methods The ratio of transmitral and annular velocities (E/Ea) and pulmonary artery systolic pressure (PASP) at rest and during exercise were measured in 498 subjects (57±11 years; 201 male). Exercise-induced PH was defined as present if PASP ≥50 mm Hg at 50 W of exercise, and an increase in LV filling pressure during exercise was present if E/Ea ≥15 at 50 W.
Main outcome measures A combination of major cardiovascular events and any cause of death.
Results During a median follow-up of 41 months, there were 14 hospitalisations and four deaths. Subjects with exercise-induced PH had significantly worse clinical outcomes than those without (p=0.014). Subjects with exercise-induced PH associated with an increase in E/Ea during exercise had significantly worse outcomes than other groups (p<0.001). However, prognosis was similar between subjects with exercise-induced PH without an increase in E/Ea and those without exercise-induced PH. In subjects with exercise-induced PH, E/Ea at 50 W was an independent predictor of adverse outcomes (HR 1.37; 95% CI 1.02 to 1.83; p=0.036).
Conclusions Exercise-induced PH provides prognostic information in subjects with preserved LV ejection fraction. The excess risk of exercise-induced PH is restricted to subjects with an increase in estimated LV filling pressure during exercise.
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Funding This work was supported by a Korean Science and Engineering Foundation (KOSEF) grant funded by the Korean government (M10642120001-06N4212-00110).
Competing interests None.
Patient consent Obtained.
Ethics approval This study was conducted with the approval of the institutional review board of Yonsei University College of Medicine.
Provenance and peer review Not commissioned; externally peer reviewed.
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