The main symptoms of qrs wave width malformation are: palpitations, precordial pain, syncope, shock, congestive heart failure in severe cases. The hemodynamic changes are mild in those with short episodes; those with episodes lasting more than 24 hours can experience significant hemodynamic changes and even sudden death. So once suspected qrs wave width aberration need to do what examination? The following together to see. 1, physical examination found: short bursts of ventricular tachycardia or persistent ventricular tachycardia is not accompanied by hemodynamic disorders of the general vital signs of the smooth, cardiac auscultation of the heart rate is fast and roughly regular, the onset of the intermittent can be detected premature beat. Those with underlying heart disease or heart rate >200 beats/min may be accompanied by hemodynamic disorders such as lowered blood pressure, dyspnea, profuse sweating, cold extremities, etc., which indicates that the patient’s condition is critical and requires urgent treatment. 2, auxiliary examination: cardiac ultrasound can clarify the underlying cardiac diseases. ①Ventricular rate is often between 150-250 beats/min, QRS wave is wide and abnormal, and the time limit is widened. ② T-wave direction is opposite to the main wave of QRS wave, and there is no fixed relationship between P-wave and QRS wave. ③ Q-T interval is mostly normal, can be accompanied by Q-T interval prolongation, mostly seen in polymorphic ventricular tachycardia. ④ The letter rate is slower than the ventricular rate, and sometimes ventricular fusion wave or ventricular capture can be seen. The electrocardiogram is an important receptor for the diagnosis of ventricular tachycardia, but sometimes it is difficult to differentiate it from supraventricular tachycardia with ventricular differential conduction, which must be carefully differentiated by a combination of clinical history, physical examination, electrocardiogram, and response to therapeutic measures. Cardiac electrophysiologic examination: Cardiac electrophysiologic examination is valuable in establishing the diagnosis of ventricular tachycardia. If the Hippocratic beam wave (H) can be recorded during the onset of tachycardia, it will help to distinguish supraventricular tachycardia from ventricular tachycardia by analyzing the interval between the onset of the Hippocratic beam wave and the onset of the ventricular wave (V) (HV interval). The HV interval for supraventricular tachycardia should be greater than or equal to the HV interval in sinus rhythm, and for ventricular tachycardia, it should be less than or negative than the sinus HV interval (due to retrograde transmission of ventricular impulses through the Hickman bundle-Pukenje system). The HV interval cannot be determined because of catheter malposition or masking of the Hickory beam wave by the ventricular wave. When atrial overdrive pacing is performed during an episode of tachycardia, if the frequency of the QRS wave cluster increases with increasing stimulation frequency and the morphology becomes normal, the original tachycardia is a ventricular tachycardia.