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Comparing chest X-rays with ultrasound for the prediction of left atrial size at Pretoria Academic hospital

by Quinton, Susanna Jacoba

Abstract (Summary)
Comparing chest X-rays with ultrasound for the prediction of left atrial size at Pretoria Academic Hospital Student: Promoter: Division: Degree: Susanna Jacoba Quinton Prof P Rheeder Clinical Epidemiology Faculty of Health Sciences MSc (Clinical Epidemiology) Introduction: Estimates of left atrial size in patients with suspected cardiac disease play an important role in diagnostic medicine. Left atrial size is used in predicting prognosis and events, as well as treatment decisions. Two methods are commonly used to estimate left atrial size: chest radiography and cardiac ultrasound. This study aims to determine the test characteristics of chest radiography and compare the use of radiographs to cardiac ultrasound (the gold standard test). Methods: Data from patients older than 18 years admitted to Pretoria Academic Hospital during 2000-2003 who had both chest X-rays and cardiac ultrasound were included in this crosssectional, retrospective analysis. Chest X-rays were classified into three quality classes, and the sub-carinal angle (SCA) and sub-angle distance (SAD) were measured twice in all available X-rays by two observers. Intra- and interobserver variability (3 methods) as well as the predictive value of the SCA and SAD measurements were determined using logistic regression (with left atrial size determined by ultrasound as comparator). P-values < 0.05 were regarded as statistically significant for all comparisons. IV iv University of Pretoria etd – Quinton, S J (2007)
Bibliographical Information:

Advisor:

School:University of Pretoria/Universiteit van Pretoria

School Location:South Africa

Source Type:Master's Thesis

Keywords:x rays heart atrium chest logistic regression analysis ultrasonic imaging

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