Diverse manifestations of junctional premature beats.

A 34-year-old female patient presented with typical junctional premature beats (JPB), along with beats mimicking blocked atrial premature beats (APB) and ventricular premature beats (VPB). In accordance with the principle of monism, these premature beats with similar coupling intervals but markedly different morphologies should be regarded as diverse manifestations of JPB. Such electrocardiographic (ECG) findings are highly deceptive and prone to misdiagnosis.