The value of terminal force of P wave in V1 lead in the diagnosis of coal-worker's pneumoconiosis with pulmonary heart disease complicated by left ventricular hypertrophy

Abstract

To determine the value of terminal force of P wave in V1 lead (Ptf-V1) in the diagnosis of coal-workers' pneumoconiosis with pulmonary heart disease complicated by left ventricular hypertrophy. Select the coal-worker with pneumoconiosis postmortem examination cases which were pathologically diagnosed as pulmonary heart disease complicated by left ventricular hypertrophy and can measure Ptf-V1. Select 14 cases with ECG left axis deviation, no deviation and right axis deviation. Measure and analyze the Ptf-V1 value, the thickness of left and right ventricular wall. There's obvious discrepancy in ventricular wall thickness mean in ECG left axis deviation, no deviation and right axis deviation groups, the discrepancy have statistical significance (F1 = 32.18, P < 0.01, F2 = 8.02, P < 0.01). The left ventricular wall is thicker in ECG left axis deviation group [(1.81 +/- 0.18) cm] than in no deviation [(1.47 +/- 0.15) cm] and right axis deviation groups [(1.39 +/- 0.10) cm], the discrepancy have statistical significance with (P < 0.01). The right ventricular wall is thicker in ECG left axis deviation group [(0.79 +/- 0.14) cm] than in no deviation group [(0.58 +/- 0.14) cm], the discrepancy have statistical significance with (P < 0.01). The right ventricular wall is thicker in ECG right axis deviation group [(0.71 +/- 0.14) cm] than in no deviation group, the discrepancy have statistical significance with (P < 0.05). ECG left axis deviation Ptf-V1 relevance ratio 85.71% is higher than in no deviation (35.70%) and right axis deviation groups (28.57%), the discrepancy have statistical significance with (P < 0.01). The Ptf-V1 absolute value is positively related with left ventricular wall thickness in ECG left axis deviation and no deviation groups (r1 = 0.92, P < 0.01, r2 = 0.93, P < 0.01). Pft-V1 absolute value is the criterion index of left ventricular morphosis and function especially left atrium loading change. ECG Ptf-V1 combined with ECG left axis deviation is valuable to the diagnosis of coal-workers with pneumoconiosis complicated by left ventricular hypertrophy.