Istaroxime in Acute Heart Failure and Early Cardiogenic Shock: A Calcium-Cycling Approach to Inotropic Therapy
Abstract
Acute heart failure (AHF) and cardiogenic shock (CS) remain major causes of cardiovascular morbidity, mortality, and healthcare utilization worldwide. Although inotropic agents are central to the management of low-output states, their clinical utility is fundamentally constrained by mechanisms that increase myocardial oxygen consumption, disrupt calcium homeostasis, and promote arrhythmogenesis, without improving long-term outcomes. These limitations reflect not only pharmacological shortcomings, but a broader conceptual reliance on amplification of intracellular calcium flux as the primary means of augmenting contractility. While effective in increasing cardiac output, this strategy imposes substantial energetic and electrophysiological costs and fails to address key abnormalities of the failing myocardium, including impaired calcium recirculation and diastolic dysfunction. Istaroxime is a first-in-class agent that combines Na+/K+-ATPase inhibition with enhancement of sarcoplasmic reticulum Ca2+-ATPase (sarcoplasmic reticulum Ca2+-ATPase isoform 2a (SERCA2a)) function, thereby modulating both calcium availability and reuptake. This dual mechanism promotes a more coordinated pattern of excitation-contraction coupling, integrating systolic augmentation with improved diastolic relaxation. Early clinical studies demonstrate a distinct hemodynamic profile characterized by increased stroke volume, preservation of heart rate, and stabilization or elevation of arterial pressure.…
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