[The location and pattern of hypertrophy of the heart in hypertension and related hemodynamics by chest X-ray film].

Abstract

To answer questions where and how cardiac hypertrophy occurs, secondary to hypertension and in what state the underlying hemodynamics in the heart is when it develops, various cardiac parameters were measured in 132 patients with hypertension, including cardiothoracic ratio (CTR) as calculated on a posteroanterior view and interval (Y) between the inferior vena cava and posterior outline of the heart 2 cm above their cross section on a lateral view of chest X-ray films, Wezler's parameters of vascular dynamics, Blumberger's systolic time intervals and thickness of the interventricular septum and posterior wall as measured by cardioechography. The patients were divided into two groups by age, the young adult group including 62 ranging from 16 to 35 and the middle age group including 70 from 36 to 60. Association among these parameters were investigated by group. The results are as follows. 1. In the juvenile group, cardiac output was usually increased, and CTR was well correlated with septal thickness. In particular systolic pressure was significantly higher in patients with CTR of 50% or greater than in those with CTR less than 50%. As CTR increased, pre-ejection period (PEP) was prolonged, ejection time (ET)/PEP ratio decreased, stroke volume (Vs) and cardiac output (CO) tended to decrease, and peripheral vascular resistance (W) tended to increase. 2. In the middle-age group, Y was closely associated with thickness of the posterior wall. When the patients were divided into two groups by Y, diastolic pressure in patients having Y of 1.8 cm or greater was significantly higher than that in the rest.(ABSTRACT TRUNCATED AT 250 WORDS)