Passive Leg Raising Correlates with Future Exercise Capacity after Coronary Revascularization

Area of Science:

• Cardiology
• Exercise Physiology

Background:

• Cardiac pumping efficiency influences hemodynamic properties, measurable via the passive leg raise test (PLRT).
• Exercise intolerance and capacity are critical outcomes following coronary revascularization procedures.

Purpose of the Study:

• To investigate the predictive capability of PLRT for exercise intolerance and capacity in patients post-coronary revascularization.
• To assess the correlation between PLRT-derived hemodynamic parameters and cardiopulmonary exercise test (CPET) results.

Main Methods:

• 120 inpatients underwent PLRT and CPET during hospitalization and after discharge.
• Non-invasive cardiac output monitoring (bio-reactance) measured stroke volume and cardiac output during PLRT.
• Two CPETs were performed: one for anaerobic threshold and one for maximal performance.

Main Results:

• Stroke volume during leg raise (SVLR) positively correlated with anaerobic threshold (R=0.653).
• SVLR/body weight demonstrated high sensitivity (0.954) and negative predictive value (0.92) for exercise intolerance.
• Cardiac output during leg raise (COLR) correlated with peak oxygen consumption (R=0.678), showing good predictive power for aerobic fitness.

Conclusions:

• PLRT is a valuable, non-invasive tool for screening and predicting exercise intolerance and capacity in patients after coronary revascularization.
• PLRT measurements obtained during hospitalization can guide early clinical management and rehabilitation strategies.