BRASH Syndrome: A Critical Intersection of Bradycardia, Renal Failure, AV-Node Blockade, Shock, and Hyperkalemia in Clinical Practice

BRASH syndrome is an underrecognized yet potentially life-threatening clinical entity characterized by the interplay of bradycardia, renal failure, AV-node blockade, shock, and hyperkalemia. This syndrome represents a complex feedback loop where the synergistic effects of hyperkalemia and atrioventricular nodal blocking agents precipitate severe bradycardia, exacerbating renal perfusion and resulting in acute kidney injury. This further amplifies hyperkalemia, perpetuating a vicious cycle that can culminate in cardiogenic shock and multiorgan dysfunction. Despite its significance, BRASH syndrome is often misdiagnosed as isolated hyperkalemia or primary heart block, leading to delays in appropriate management. Early recognition and a systematic approach to its pathophysiology are essential for targeted treatment. The present review synthesizes current knowledge on the pathogenesis, diagnostic criteria, and evidence-based management strategies for BRASH syndrome, emphasizing the importance of tailored therapeutic interventions to break the cycle of deterioration. Additionally, we discuss emerging insights into its pathophysiology and highlight gaps in the literature requiring further investigation.