Publications by authors named "Waldo G Ortin"
Background: Restitution kinetics (RK) of action potential duration (APD) are classically studied by applying an extra impulse at varying diastolic intervals (DI) and might differ from RK elicited by sympathetic nerve stimulation (SNRK).
Objective: To measure 'Physiological' RK during gradual increases in heart rate caused by sympathetic nerve stimulation (SNS) and its possible spatial heterogeneities caused by non-uniform innervation of the myocardium.
Methods: The SNRK was measured from rabbit hearts with intact sympathetic innervation using optical mapping.