RESUMO
UNLABELLED: Extrasystoles (RVES) from the right ventricular outflow tract (RVOT) are a common arrhythmia in routine ECGs. METHODS: In this prospective study 56 consecutive patients with RVES (22 males, 34 females) were examined for morphological and/or functional right ventricular (RV) abnormalities by 12-lead, Holter, exercise ECGs, transthoracic echocardiography and signal averaging. The follow-up time was 3.1-15.8 years (arithmetic mean +/- SD = 7.2 +/- 1.6 years; median, 6.9 years). Patients with hyperthyroidism, structural cardiovascular and/or lung diseases were excluded. RESULTS: A total of 57.1% of the patients with RVES presented with echomorphologic abnormalities of the right ventricle (RV). In 26.8% the echomorphologic right ventricular abnormalities progressed in 33.3% of patients with normal RVs at baseline (group I) and in 21.9% of those with abnormal RVs at baseline (group II). No significant differences were found between the 2 patient groups in terms of age at onset, family history, ECG changes, late potentials and malignant right ventricular outflow tract arrhythmias on 24-h and exercise ECGs. While females predominated in group I, males were numerous in group II (p = 0.006). Sustained ventricular tachycardia, syncope or sudden death were absent throughout the follow-up. CONCLUSION: Patients with RVES carry a good prognosis in terms of morbidity and mortality no matter whether echomorphologic abnormalities are present or not.
