During systole, which variation is less intense during inspiration and seen in pulmonary hypertension and pulmonary stenosis?

During systole, which variation is less intense during inspiration and seen in pulmonary hypertension and pulmonary stenosis?

• A. Pulmonary ejection systolic sounds
• B. Aortic ejection clicks
• C. Mitral valve opening snap
• D. S4 gallop

Answer: (A)

The key idea is how a systolic sound over the pulmonary valve can vary with respiration and be a clue to right-sided valve or pressure problems. A pulmonary ejection systolic sound is produced when blood is ejected through the pulmonary valve and is often heard with conditions that raise flow or pressure across that valve, such as pulmonary hypertension or pulmonary stenosis. During inspiration, intrathoracic pressure falls and venous return to the right heart increases, which can soften the abrupt ejection event and make this sound less intense. That pattern—diminished intensity with inspiration and association with elevated right-sided pressures—fits pulmonary ejection systolic sounds best. By contrast, an aortic ejection click is tied to the aortic valve and not specifically linked to inspiration or right-sided disease, a mitral valve opening snap occurs in diastole with left-sided involvement, and an S4 gallop is a diastolic event related to a stiff ventricle, not a systolic pulmonary-focused sound.

The key idea is how a systolic sound over the pulmonary valve can vary with respiration and be a clue to right-sided valve or pressure problems. A pulmonary ejection systolic sound is produced when blood is ejected through the pulmonary valve and is often heard with conditions that raise flow or pressure across that valve, such as pulmonary hypertension or pulmonary stenosis. During inspiration, intrathoracic pressure falls and venous return to the right heart increases, which can soften the abrupt ejection event and make this sound less intense. That pattern—diminished intensity with inspiration and association with elevated right-sided pressures—fits pulmonary ejection systolic sounds best.

By contrast, an aortic ejection click is tied to the aortic valve and not specifically linked to inspiration or right-sided disease, a mitral valve opening snap occurs in diastole with left-sided involvement, and an S4 gallop is a diastolic event related to a stiff ventricle, not a systolic pulmonary-focused sound.