Novel techniques for quantifying oxygen pulse curve characteristics during cardiopulmonary exercise testing in tetralogy of fallot.

Background: Cardiopulmonary exercise testing (CPET) is used in evaluation of repaired tetralogy of Fallot (rTOF), particularly for pulmonary valve replacement need. Oxygen pulse (OP) is the CPET surrogate for stroke volume and peripheral oxygen extraction.

Objectives: This study assessed OP curve properties against non-invasive cardiac output monitoring (NICOM) and clinical testing.