摘要:

The Frank vectorcardiograms of 50 patients with complete transposition of the great vessels were analyzed, and the findings were correlated with the electrocardiogram and hemodynamics. The patients were divided into four groups according to the presence or absence of ventricular septal defect and left ventricular outflow tract obstruction. In group I, consisting of 20 patients with ventricular septal defect, the vector cardiograms showed evidence of combined ventricular hypertrophy in 80% of the cases, the scalar electrocardiogram, in 40%.In group II, 13 patients with ventricular septal defect and left ventricular outflow tract obstruction, the vectorcardiogram was consistent with either right, combined, or left ventricular hypertrophy.In groups III and IV, patients with intact ventricular septum with or without left ventricular outflow tract obstruction, the vectorcardiogram was consistent with right ventricular hypertrophy in the majority of cases.

ISSN:0009-7322    

出版商:OVID    

年代:1967

数据来源: OVID

摘要:

Expanding the frequency response of the electrocardiogram and its derivative to 1,000 cps revealed notching in certain parts of the QRS complex which correlates with the presence of primary myocardial disease. Chi-square analysis of data from 169 patients with myocardial involvement indicated that notching on the downstroke of leads X, V4, and V6separated abnormal from normal patients at the 1% level of significance, whereas fine and coarse slurring showed reverse correlation at the 1% level of significance. This suggests that notching and not slurring is the important evidence of disease. Neither notching nor slurring was significant at the peak of the R wave in any lead. Study of individual cases revealed that complete right and left bundle-branch blocks do not mask high-frequency components caused by myocardial disease nor do they produce high-frequency components. Conclusions regarding specific diagnostic nostic criteria, however, should serve only as guidelines.

ISSN:0009-7322    

出版商:OVID    

年代:1967

数据来源: OVID

摘要:

The weight of the right ventricle, left ventricle, and septum determined in 98 hearts of high altitude (12,300 feet) residents in Peru and in 86 hearts from sea level in the continental United States revealed that right ventricular hypertrophy is no greater at high altitude than at sea level in the stillborn-newborn infant heart. Right ventricular weight relative to total heart weight at high altitude exceeds that at sea level beginning about 30 days after birth and reaches a plateau at 56 days. Thereafter the degree of relative right ventricular hypertrophy changes only slightly through the adult years. No evidence was found of postnatal atrophy of the right ventricle either at sea level or high altitude nor of septal hypertrophy accompanying the right ventricular hypertrophy in high altitude. The degree of right ventricular hypertrophy was moderate and variable, and corresponded to the moderate, variable pulmonary hypertension previously demonstrated in high altitude residents. Since total heart weights are similar at high altitude and sea level and since high altitude subjects have a smaller body size, the heart weight/body weight ratio is probably greater in the high altitude subject.

ISSN:0009-7322    

出版商:OVID    

年代:1967

数据来源: OVID

ISSN:0009-7322    

出版商:OVID    

年代:1967

数据来源: OVID

ISSN:0009-7322    

出版商:OVID    

年代:1967

数据来源: OVID