Pulmonary vascular response patterns during exercise in left ventricular systolic dysfunction predict exercise...

Area of Science:

• Cardiology
• Pulmonary Hypertension
• Exercise Physiology

Background:

• Elevated resting pulmonary arterial pressure (PAP) in patients with left ventricular systolic dysfunction (LVSD) is linked to poor prognosis.
• However, the specific patterns of PAP response during exercise in LVSD and their prognostic implications remain uncharacterized.

Purpose of the Study:

• To characterize pulmonary arterial pressure (PAP) response patterns during exercise in patients with left ventricular systolic dysfunction (LVSD).
• To investigate the relationship between these PAP patterns, functional capacity, and patient survival.

Main Methods:

• Sixty patients with LVSD and 19 controls underwent maximal incremental cardiopulmonary exercise testing with simultaneous hemodynamic monitoring.
• Pulmonary arterial pressure (PAP) and other hemodynamic parameters were measured during exercise, and their increments relative to work were analyzed.

Main Results:

• LVSD patients exhibited significantly greater PAP augmentation during low-level exercise compared to controls.
• Two distinct PAP response patterns were observed in LVSD patients: a linear increment (65%) and a steep initial increment followed by a plateau (35%).
• The plateau pattern was associated with reduced exercise capacity (peak Vo2), impaired right ventricular function, and significantly increased mortality (HR 8.1).

Conclusions:

• A steep increase in PAP during exercise and failure to augment PAP throughout exercise are associated with decreased exercise capacity and survival in LVSD patients.
• These abnormal exercise-induced PAP patterns may represent novel therapeutic targets for improving outcomes in LVSD.