Q—T间期延长系指Q—Tc>0.44秒而言。各种病因所致的Q—T间期延长,均可使心肌不应期离散度加大,容易形成多发室内折返,从而诱发恶性室性心律失常(室速、室颤),导致猝死。本文重点讨论引起Q—T间期延长的一些疾患及其并发恶性室性心律失常(主要为尖端扭转型室速)的诊断治疗。一、原发性Q—T间期延长综合征本病较少见,临床易误诊为癫痫及癔病等。其主要特点为Q—T间期延长,发作性晕 Q-T prolongation means Q-Tc> 0.44 seconds. A variety of causes of Q-T interval prolongation, can make the myocardial refractory period dispersion increased, prone to multiple indoor reentry, which induced malignant ventricular arrhythmias (VT, VF), leading to sudden death. This article focuses on the diagnosis and treatment of some of the disorders that cause prolonged Q-T intervals and their associated malignant ventricular arrhythmias, mainly torsades de pointes. First, the primary Q-T extended syndrome This disease is rare, clinically misdiagnosed as epilepsy and hysteria. The main features of the Q-T interval prolongation, seizures halo