An early systolic opening click followed by a systolic ejection murmur radiating to the base is characteristic of which lesion?

An early systolic opening click followed by a systolic ejection murmur radiating to the base is characteristic of which lesion?

• A. Pulmonic stenosis
• B. Aortic stenosis
• C. Mitral valve prolapse
• D. Tricuspid regurgitation

Answer: (A)

This item looks at how a valve problem can produce both an opening click and an early systolic ejection murmur, guiding you to the correct valve lesion. An opening click early in systole followed by a systolic ejection murmur that radiates toward the base points to pulmonic stenosis. The pulmonic valve is stiff or narrowed, so it has a distinct click when it opens at the start of systole. Right after that opening, blood is forcefully ejected through the narrowed valve, creating the systolic ejection murmur heard best at the left upper sternal border. The radiation to the base (the upper chest) fits the pattern for a murmur originating from the pulmonary valve region. Understanding the alternatives helps reinforce the pattern: aortic stenosis usually gives a crescendo-decrescendo murmur best at the right second intercostal space with possible radiation to the carotids, and does not typically feature this opening click in early systole. Mitral valve prolapse produces a mid-to-late systolic click followed by a murmur that peaks late in systole, not an early systolic opening click. Tricuspid regurgitation is a holosystolic murmur heard best along the left lower sternal border, not an early systolic opening click plus ejection murmur. So, the combination of an early systolic opening click and an adjacent systolic ejection murmur radiating to the base is most characteristic of pulmonic stenosis.

This item looks at how a valve problem can produce both an opening click and an early systolic ejection murmur, guiding you to the correct valve lesion.

An opening click early in systole followed by a systolic ejection murmur that radiates toward the base points to pulmonic stenosis. The pulmonic valve is stiff or narrowed, so it has a distinct click when it opens at the start of systole. Right after that opening, blood is forcefully ejected through the narrowed valve, creating the systolic ejection murmur heard best at the left upper sternal border. The radiation to the base (the upper chest) fits the pattern for a murmur originating from the pulmonary valve region.

Understanding the alternatives helps reinforce the pattern: aortic stenosis usually gives a crescendo-decrescendo murmur best at the right second intercostal space with possible radiation to the carotids, and does not typically feature this opening click in early systole. Mitral valve prolapse produces a mid-to-late systolic click followed by a murmur that peaks late in systole, not an early systolic opening click. Tricuspid regurgitation is a holosystolic murmur heard best along the left lower sternal border, not an early systolic opening click plus ejection murmur.

So, the combination of an early systolic opening click and an adjacent systolic ejection murmur radiating to the base is most characteristic of pulmonic stenosis.