{'fraction_non_alphanumeric': 0.03234802007808143, 'fraction_numerical': 0.02063580591187953, 'mean_word_length': 5.229166666666667, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
[Hyperkinetic ventricular arrhythmia during the treadmill test in chronic ischemic heart disease].

Aim of this study was to evaluate the pattern of onset and the characteristics of ventricular arrhythmias (VA) observed during treadmill test (TT) in patients with chronic ischemic heart disease (CIHD). Two groups of patients with CIHD were retrospectively compared: group A consisted of 120 consecutive patients with premature ventricular beats (PVBs) either isolated (greater than 2/min) or repetitive during exercise, or maximal exercise, or recovery; group B consisted of 140 consecutive patients without PVBs during TT. The two groups were comparable in mean age, male/female ratio, incidence of previous myocardial infarction, of previous coronary artery by-pass graft or of percutaneous transluminal coronary angioplasty. There were no significant differences between the two groups regarding the parameters evaluated during TT: duration of exercise, maximal heart rate, heart rate-systolic blood pressure product as well as in the percentage of positive tests for acute myocardial ischemia (51.6% vs 40.7%). In the two subgroups of patients who underwent coronary arteriography and left ventricular angiography (24/120 and 23/140 patients respectively) no differences were found in the number and distribution of critical coronary stenosis and of dyskinetic or akinetic areas. In both groups A and B the QTc interval at maximal exercise was significantly longer than its value at rest (p less than 0.001), but there was no relevant difference between the two groups. In group A patients with VA during maximal exercise (n = 60) showed a higher prevalence of complex VA (class Lown greater than or equal to 3) compared to the others (p less than 0.005).(ABSTRACT TRUNCATED AT 250 WORDS)