Koehler N R, Bodanese L C, Acevedo L, Rabin M, Stein R
Hospital São Lucas e Faculdade de Medicina da PUC/RS, Porto Alegre.
Arq Bras Cardiol. 1995 Aug;65(2):139-42.
To determine the type of cardiac disease causing left bundle branch block (LBBB) in Porto Alegre, Brazil, and to assess the role of associated left axis deviation (-30 degrees or more in the frontal plane) in order to identify a specific etiology of LBBB.
Through reports from the assistant physicians or through examination of the patients, the underlying heart disease in 264 cases of LBBB was assessed. The chi-square test was used to determine a possible association between left anterior hemiblock LBBB and one or more specific type of underlying heart disease.
Systemic arterial hypertension (30.7%), ischemic heart disease (30.3%), valvar heart disease (8.7%), cardiomyopathies (7.5%), idiopathic degenerative disease of the conduction system (1.6%) and miscellaneous heart diseases (1.2%) were the underlying heart diseases. The presence of LBBB did not indicate any specific type of cardiac disease.
The causes of LBBB in Porto Alegre are the same as reported in the international medical literature. Upward and leftward deviation (> or = -30 degrees) of QRS axis in the frontal plane did not show statistical significant association with any type of underlying cardiac disease.
确定巴西阿雷格里港导致左束支传导阻滞（LBBB）的心脏病类型，并评估相关左轴偏移（额面-30度或更大）的作用，以确定LBBB的特定病因。
通过助理医师的报告或对患者的检查，评估264例LBBB患者的潜在心脏病。采用卡方检验确定左前分支阻滞性LBBB与一种或多种特定类型的潜在心脏病之间可能存在的关联。
潜在心脏病包括系统性动脉高血压（30.7%）、缺血性心脏病（30.3%）、瓣膜性心脏病（8.7%）、心肌病（7.5%）、传导系统特发性退行性疾病（1.6%）和其他心脏病（1.2%）。LBBB的存在并不表明任何特定类型的心脏病。
阿雷格里港LBBB的病因与国际医学文献报道的相同。额面QRS轴向上和向左偏移（≥-30度）与任何类型的潜在心脏病均无统计学显著关联。
