Heart failure & cardiomyopathies
Investigating the Anrep Effect in Hypertrophic Obstructive Cardiomyopathy With Invasive Pressure-Volume Analysis
Authors' conclusion
The Anrep effect is an energy-demanding compensatory mechanism that maintains stroke volume under elevated afterload by increasing contractility and prolonging systole. This study confirms its chronic activation in HOCM and its immediate reversal post-PTSMA.
Study context
- Population
- Obstructive hypertrophic cardiomyopathy (HOCM) patients undergoing percutaneous transluminal septal myocardial ablation (PTSMA) to relieve left ventricular (LV) outflow tract obstruction
- Participants
- 14 HOCM patients
- Comparison
- pre- vs post-PTSMA
Main finding
As reported in the abstract
P = 0.0001
Further findings
Afterload: effective arterial elastance · reduction post-PTSMA
P = 0.002
Contractility: end-systolic elastance · reduction post-PTSMA
P = 0.0001
Contractility: dP/dtmax · reduction post-PTSMA
P = 0.017
Systolic duration: dTes · reduction post-PTSMA
P = 0.002
Mechanical workload: SW · higher preprocedure
P = 0.004
Mechanical workload: potential energy · higher preprocedure
P = 0.002
Mechanical workload: PVA · higher preprocedure
P = 0.0002
Efficiency: SW/PVA · lower preprocedure
P = 0.03
Original publication
Summarised from the published abstract; every number is checked against it