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Diagnostic value of the apex beat
T W O'Neill1, M Barry, M Smith
1Department of Cardiology, Meath Hospital, Dublin, Ireland.
Insights
Apex displacement is an unreliable indicator for diagnosing cardiomegaly (enlarged heart). Palpability is affected by patient factors, and diagnostic accuracy is limited compared to radiographic measurements.
Area of Science:
- Cardiology
- Diagnostic Imaging
- Clinical Examination
Background:
- Cardiomegaly, an enlarged heart, is a significant clinical finding.
- Accurate diagnosis of cardiomegaly is crucial for patient management.
- Clinical signs are often used as initial screening tools.
Purpose of the Study:
- To evaluate the diagnostic value of apex displacement for identifying cardiomegaly.
- To compare the effectiveness of apex displacement with radiographic cardiothoracic ratio.
- To assess factors influencing the palpability of the cardiac apex.
Main Methods:
- Prospective examination of 100 patients.
- Assessment of apex displacement relative to the midsternal line and midclavicular line.
- Correlation of clinical findings with radiographic cardiothoracic ratio (CTR > 50%).
- Analysis of factors affecting apex palpability (body frame, weight, body fat).
Main Results:
- Apex displacement beyond the midclavicular line showed a specificity of 76% and sensitivity of 59% for cardiomegaly.
- Apex located more than 10 cm from the midsternal line was more sensitive but less specific.
- Apex palpability was significantly influenced by patient body composition and frame size.
- Diagnostic accuracy of apex displacement was inferior to the cardiothoracic ratio.
Conclusions:
- Apex displacement is a suboptimal diagnostic test for cardiomegaly.
- Clinical assessment of apex displacement has limited sensitivity and specificity.
- Radiographic cardiothoracic ratio remains a more reliable indicator of cardiomegaly than apex displacement.
Abstract:
100 patients were examined without knowledge of other findings to assess the value of apex displacement as a sign of cardiomegaly; 25 had a radiographic cardiothoracic ratio greater than 50%. The apex was located in only half of the patients, palpability being influenced by frame size, percentage ideal body weight, and percentage body fat. By comparison with the cardiothoracic ratio, apex displacement beyond the midclavicular line as the diagnostic test for cardiomegaly had a specificity of 76%, a sensitivity of 59%, a positive predictive value of 59.4%, and a negative predictive value of 76.9%. Another clinical sign of cardiomegaly, apex more than 10 cm from the midsternal line, was more sensitive but even less specific.