How to differentiate ejection murmurs from systolic regurgitant murmurs

Area of Science:

• Cardiology
• Medical Diagnostics
• Auscultation Techniques

Background:

• Distinguishing systolic murmur shapes (crescendo-decrescendo vs. plateau) by sound alone is challenging.
• Ejection murmurs and regurgitant murmurs present diagnostic difficulties based solely on auditory perception.

Purpose of the Study:

• To identify auscultatory characteristics differentiating ejection murmurs from plateau-shaped regurgitant systolic murmurs.
• To provide clear guidance on distinguishing these two murmur types using cardiac auscultation.

Main Methods:

• Detailed auscultation focusing on accompanying heart sounds.
• Analysis of murmur loudness variations following prolonged diastole.
• Evaluation of murmur timing and dynamic changes.

Main Results:

• The rhythmic peak of ejection murmurs, synchronized with heart sounds, is absent in regurgitant murmurs.
• Increased ejection murmur loudness after a long diastole aids differentiation when heart sounds are absent.
• The term "midsystolic" is deemed misleading for ejection murmurs.

Conclusions:

• Auscultation, incorporating heart sounds and diastolic variations, effectively distinguishes ejection from regurgitant systolic murmurs.
• Avoidance of the term "midsystolic" is recommended for clearer understanding of ejection murmur characteristics.
• Accurate differentiation improves diagnostic precision in cardiac auscultation.