The patient's pulse exhibits a characteristic ______ amplitude after a premature beat, indicating post-extrasystolic potentiation.

Increased pulse amplitude following a premature beat is known as post-extrasystolic potentiation. This occurs because the longer compensatory pause allows more time for ventricular filling, resulting in a stronger subsequent contraction.

Post-Extrasystolic Potentiation (PESP):
- Definition: Enhanced cardiac contractility following premature ventricular contractions
- Mechanism: Increased calcium loading during compensatory pause
- Features:
* Longer diastolic filling time
* Enhanced ventricular contractility
* Stronger subsequent beat
* Increased stroke volume
* Higher pulse pressure

Clinical Significance:
- Diagnostic marker for heart failure
- Assessment of contractile reserve
- Indicator of myocardial viability
- Used in stress testing evaluation

Hemodynamic Changes:
- Increased systolic pressure
- Enhanced cardiac output
- Improved ventricular performance
- Augmented coronary blood flow
- Elevated ejection fraction

Related Phenomena:
- Force-frequency relationship
- Frank-Starling mechanism
- Calcium-dependent inotropy
- Mechanical restitution
- Contractile protein interaction