Premature ventricular contractions are also known as ventricular preterm contractions. Ventricular preterm duplex refers to the frequent occurrence of premature ventricular contractions in the presence of a normal sinus rhythm. A sinus rhythm plus a ventricular premature beat, followed by a sinus rhythm, followed by a ventricular premature beat, presenting frequently occurring alternating normal and abnormal beats, is called a ventricular premature duplex. In patients with ventricular duplex rhythm, most of whom have frequent ventricular premature beats, a twenty-four-hour ambulatory electrocardiogram should be performed to determine the average heart rate, the slowest heart rate, the number of fastest heart rates, and the number of premature ventricular beats in a twenty-four-hour day. If the ventricular premature beats exceed one percent of the total number of beats a day and are accompanied by palpitations and other symptoms, medication is considered, mainly antiarrhythmic drugs such as beta-blockers to slow down the number of premature beats; if the twenty-four-hour ECG shows that the number of premature beats is particularly high, reaching more than 5,000 beats, and the medication is not effective in controlling the beats, hospitalization is indicated for elective electrophysiological examination and radiofrequency ablation surgery to remove the frequent premature ventricular contractions.