ABSTRACT
The correlation between the right posterior surface of the QRS complex in the horizontal plane and the various parameters characterizing the right ventricle on TM and 2D echocardiography on left parasternal longitudinal sections and subcostal sections was investigated by the Chi-square independence test and Student's t test in 185 cases of heart disease due to various aetiologies. The right posterior surface (Octant III) of the QRS complex in the horizontal plane is independent of the diastolic thickness of the right ventricular posterior wall (RVPW); the diastolic thickness of the right ventricular anterior wall (RVAW); the right ventricular ejection fraction (RVEF); the systolic diameter and diastolic diameter of the right ventricle; the percentage thickening of the RVPW and the RVAW; and, finally, there is no significant relationship between the diastolic thickness of the RVPW and that of the RVAW. Its variance according to the presence or absence and the nature of an associated conduction disorder (RBBB, RIBBB, RBBB + LAHB, LAHB, LBBB, LIBBB or Kent) was not significant for a risk of error of 5% and 1%. The right posterior surface (Octant III) of the QRS complex in the horizontal plane is significantly correlated with the right ventricular mass (RVM), calculated from the diastolic thickness of the right ventricular posterior wall (RVPW): alpha < 0.001; according to a simplified formula: RVM g/m2 = (RVDD + 2 RVPW)3. The correlation between these last two quantitative parameters is borderline significant r = 0.11 t = 1.25, 0.20 < alpha < 0.30 according to a linear regression equation: y = 55.15-34.71 x; Po = 549 t = 1.48, increasing from 0 to 0.137 and decreasing beyond 0.137, linearity hypothesis: admissible, p = 0.04.
Subject(s)
Echocardiography , Hypertrophy, Right Ventricular/diagnosis , Vectorcardiography , Analysis of Variance , Chi-Square Distribution , Humans , Hypertrophy, Right Ventricular/diagnostic imagingABSTRACT
In almost 200 case of left ventricular hypertrophy (LVH) secondary to hypertension (HT), including 75 cases with conduction disorders, 100 cases of normal adults and 20 cases of normal children, segmental (initial horizontal vector, maximal anterior and posterior vector of the QRS) and spatial vectorial parameters were correlated to segmental echocardiographic parameters (septum, anterior and posterior wall of the left ventricle) and mass parameters (left ventricular mass index). The only significant quantitative variables in hypertensive LVH are: on electrocardiography: the AQRS and Sokolow's index: on vectocardiography: the spatial vector: its magnitude, azimuth and elevation, the maximal posterior vector: its amplitude, the maximal anterior vector: its amplitude, the maximal width of the QRS azimuth of the efferent limb of the QRS, the ventricular gradient in the horizontal, frontal and sagittal planes; on echocardiography: the left ventricular mass index, the diastolic thickness of the septum and the VMNES, the diastolic thickness of the posterior wall of the left ventricle and its percentage thickening. The only significant correlations were observed between: the maximal posterior vector of QRS and the diastolic thickness of the posterior wall of the left ventricle: 0.01 < alpha < 0.02; the spatial vector and the left ventricular mass index: 0.01 < alpha < 0.001. The presence of a conduction disorder does not modify these last two qualitative variables but alters their correlation.
Subject(s)
Hypertension/complications , Hypertrophy, Left Ventricular/diagnostic imaging , Vectorcardiography , Adult , Arrhythmias, Cardiac/diagnostic imaging , Arrhythmias, Cardiac/etiology , Arrhythmias, Cardiac/physiopathology , Child , Humans , Hypertension/diagnostic imaging , Hypertension/physiopathology , Hypertrophy, Left Ventricular/etiology , Hypertrophy, Left Ventricular/physiopathology , Reference Values , UltrasonographyABSTRACT
In chronic interstitial nephritis there is a salt-losing syndrome. The reduction in the number of nephrons provides an experimental model for a study of the effects of a sodium load on the kidney. Partial restoral of renal function follows administration of sodium chloride and permits one to consider the main mechanisms of the regulation of sodium balance.
