paroxysmal ventricular tachycardia

Paroxysmal ventricular tachycardia (VT) (Department of Cardiovascular Medicine) refers to a rapid ventricular rhythm originating below the bundle of His branches, with a rate >100 beats/min for 3 or more consecutive beats, termed ventricular tachycardia. When the episode lasts less than 30 seconds and terminates spontaneously, it is called paroxysmal ventricular tachycardia. It is commonly seen in organic heart disease, and can also occur in severe electrolyte disturbances, drug intoxication, and during cardiac surgery. In very rare cases, patients have no organic heart disease, and the episode characteristics are similar to supraventricular tachycardia. The ECG QRS complexes are mostly widened and deformed, and ventricular capture and fusion beats can be seen, which can be used to differentiate it from supraventricular tachycardia. During VT episodes, severe hemodynamic disturbances may occur, causing hypotension, shock, syncope, convulsions, and acute cardiac insufficiency, and even sudden death. Therefore, it must be managed promptly.