Comparing Cardiopulmonary Exercise Testing in End-Stage Liver Disease Patients.

Area of Science:

• Cardiopulmonary physiology
• Transplant medicine
• Exercise testing

Background:

• Poor cardiopulmonary fitness is linked to adverse outcomes in liver transplant candidates.
• Standard cardiopulmonary exercise testing (CPET) is crucial for assessing fitness but can be resource-intensive.

Purpose of the Study:

• To evaluate the feasibility and equivalence of a modified 3-minute step test compared to standard CPET.
• To determine if the step test can serve as an office-based alternative for assessing cardiopulmonary capacity in severely decompensated liver disease patients.

Main Methods:

• Five patients with severe end-stage liver disease (Childs-Pugh C) awaiting liver transplantation underwent both standard CPET and a modified 3-minute step test.
• Key cardiopulmonary parameters including peak oxygen uptake (Vo2) and ventilatory efficiency were measured and compared.

Main Results:

• All patients successfully completed both the step test and CPET.
• Peak Vo2, Vo2 at respiratory exchange ratio of 1.0, and ventilatory efficiency (Ve/Vco2 slope) were similar between the two tests.
• The anaerobic threshold was also comparable, occurring at approximately 80% of peak Vo2 for both assessments.

Conclusions:

• The modified 3-minute step test is a viable, simplified method for assessing cardiopulmonary exercise capacity in liver transplant candidates with decompensated cirrhosis.
• This office-based test demonstrates comparable results to standard CPET, offering a more accessible evaluation tool.