A study of the transverse diameter of the heart silhouette with prediction table based on the teleoroentgenogram

The most important contributions to the quantification of left ventricular volume in man to date have employed the angiographic technic (1-3). Although stated to be accurate, this method is time-consuming, requires expensive equipment, alters ventricular contraction, is relatively limited in the number of observations that can be made safely, and may present the hazard of myocardial injury. The indicator dilution method for estimation of ventricular volume (4, 5), on the other hand, although more dependent on uniform ventricular mixing and totally unrevealing of ventricular shape, presents the advantages of having little effect on the heart, unlimited repeatability, and simplicity of calculation. This communication reports measurement of left ventricular volume in man by the thermodilution technic (6) under a variety of conditions and the utilization of these data to determine ventricular systolic force and fiber shortening. MethodsThirty-nine patients were studied and classified on the basis of clinical evidence and diagnostic cardiac catheterization. Subjects with mitral regurgitation and significant aortic regurgitation were not included because of the inability to calculate true left ventricular volume in the presence of these defects (7). The following categories were studied:"Normal" left ventricle (22 subjects). This category was divided into groups A and B according to the apparent degree of "normality." Group A comprised seven

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“…Nine of these had clinical symptoms of left ventricular failure. These patients showed varying degrees of cardiac enlargement by X ray (9).…”

Section: Methodsmentioning

confidence: 91%

“…Three subjects had symptoms and signs of left ventricular failure. All had an increase in cardiac silhouette (9).…”

Section: Methodsmentioning

confidence: 99%

Left Ventricular Volume in Man Measured by Thermodilution*

Gorlin¹,

Rolett²,

Yurchak³

et al. 1964

J. Clin. Invest.

110

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“…The addition of oblique views did not improve the accuracy of posteroanterior and lateral projections for detection of enlargement of the left ventricle and left atrium. These results explain the poor accuracy of chest radiograms found by others that used only the cardiothoracic ratio or measures of cardiac enlargement as a whole for detection of left ventricular enlargement 5,[14][15][16][17][18][19][20] . Since the studies of Eyler et al 21 and of Hoffman and Rigler 22 , the importance of lateral radiography has become evident for evaluation of the left ventricle.…”

Section: Discussionmentioning

confidence: 99%

“…Most of studies using radiographic exam limited to a single view for evaluation of the cardiothoracic ratio, have indicated that chest radiograph and ECG, separately, present very limited value in LVH diagnosis 12,13,[15][16][17][36][37][38] . However, the combination of both could constitute a good method for LVH diagnosis at the primary level of health care, which was demonstrated in this study.…”

Section: Ribeiro Et Al Chest X-ray-ecg Accuracy In Lvh Diagnosismentioning

confidence: 99%

Acurácia da radiografia de tórax associada a eletrocardiograma no diagnóstico de hipertrofia em hipertensos

Ribeiro¹,

Morceli²,

Gonçalves³

et al. 2012

Arq. Bras. Cardiol.

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“…Particular attention was paid to the progressive changes in the patient's own series of x-ray films and occasionally enlargement definitely took place even though the percentage of deviation from the predicted value remained within normal limits. tion: The relationship of the size of the heart to the duration of hypertension from its discovery may be observed in table 1. In the absence of any previous record of hypertension at this hospital or in any other institution, the date of discovery of hypertension was taken from the time of first observation at our clinic.…”

Section: Methodsmentioning

confidence: 99%