The value of RV(6) > RV(5) of ECG in diagnosis of pneumocardiac disease complicated by left ventricular hypertrophy in coal-workers with pneumoconiosis

Abstract

This thesis will discuss the value of RV(6) > RV(5) of ECG in diagnosis of pneumocardiac disease complicated by left ventricular hypertrophy in coal-workers with pneumoconiosis through the analysis of the ECG characteristics in the postmortem examination of coal-workers with pneumoconiosis. Three data groups will be formed on the basis of the ECG data in the case 47 postmortem examination of coal-workers with pneumocardiac disease complicated by left ventricular hypertrophy, and they are right deviation group with ECG cardiac electric axis more than 90 degrees (case 16), no deviation group with ECG cardiac electric axis between 30 degrees and 90 degrees (case 16) and left deviation group with ECG cardiac electric axis between 30 degrees and -30 degrees (case 15). The method that this thesis adopted is to compare the thickness of the right and left ventricle walls of the three groups, their ratio and the detectable ratio of ECG RV(6) > RV(5). The detectable rate of the thickness of right ventricle front wall, the thickness of the left ventricle wall, the thickness of the left ventricle wall to the thickness of right ventricle wall and ECG RV(6) > RV(5) in left deviation group is obviously higher than those of the no deviation group and right deviation group. The differences between the three groups are of statistics significance (P < 0.01); the detectable rate of the thickness of right ventricle front wall, the thickness of the left ventricle wall, the thickness of the left ventricle wall to the thickness of right ventricle wall and ECG RV(6) > RV(5) in no deviation group is obviously higher than those of the right deviation group. The differences are of statistics significance (P < 0.01). In case 47 that pneumocardiac disease complicated by left ventricular hypertrophy in coal-workers with pneumoconiosis, the ECG shows 20 cases of ECG RV(6) > RV(5). There are altogether 3 kinds of ECG types: (1) 14 cases of ECG RV(6) > RV(5); (2) 4 cases of left ventricular hypertrophy; (3) 2 cases of right ventricular hypertrophy. The left deviation of ECG cardiac electric axis and ECG RV(6) > RV(5) can be used as indications to diagnosis of pneumocardiac disease complicated by left ventricular hypertrophy in coal-workers with pneumoconiosis.