A CONSTRAINT-BASED PHYSICAL THEORY OF ACUTE CARDIAC EVENTS AS PUMP INSTABILITY IN A NON-EQUILIBRIUM SYSTEM

This paper analyzes acute cardiac events as a physical loss-of-stability transition in the heart–vascular system treated strictly as a driven, non-equilibrium pump. Using only experimentally established physical mechanisms—force generation, energy and momentum transfer, dissipation, and reciprocal back-reaction—it shows that stable operation requires sufficient damping to enforce net negative energy feedback under perturbation. When dissipative capacity and operating margin are eroded, perturbations necessarily grow under sustained drive, making instability unavoidable at finite time. The work deliberately excludes biological interpretation, clinical classification, statistics, and mathematics, isolating the mechanistic necessity of pump failure itself.