[Ventricular extrasystole. Which should be treated and how?].
The decision of whether or not to treat a ventricular extrasystole depends in the first instance on the benign or severe nature of the disorder, and on whether there is subjacent cardiopathy. The results of 24-hour Holter monitoring, exercise tolerance tests and clinical and echographic examinations will define the pathological character of a ventricular extrasystole and will indicate any subjacent cardiopathy. Electrophysiological exploration with programmed stimulation should be reserved for so-called lethal cases of arrhythmia, such as attacks of sustained ventricular tachycardia. Ischemic cardiopathy is by far the most frequent cause of ventricular extrasystoles. The two major risks of sudden death after myocardial infarction are due to left ventricular dysfunction and repetitive and/or complex ventricular extrasystoles, as well as to attacks of ventricular tachycardia. Heart patients presenting these disorders must receive urgent treatment with antiarrhythmics. Isolated, monomorphic ventricular extrasystoles are also treated in heart patients at risk if their frequency is greater than 10 per hour, measured by 24-hour Holter monitoring. In the absence of subjacent cardiopathies, the therapeutic indications are much less well defined. Approximately five per cent of subjects in a normal population present ventricular extrasystoles, the frequency of which, however, rarely exceeds 100 per 24 hours. Repetitive phenomena are only seen in 10 per cent of cases. Attacks of ventricular tachycardia are almost never seen. Ventricular extrasystoles that develop in apparently normal hearts, but which do not fulfill the above criteria, can be considered abnormal. Nevertheless, there is no categorical proof that these ventricular extrasystoles represent any risk, notably of sudden death.(ABSTRACT TRUNCATED AT 250 WORDS)