Kussmaul’s sign is NOT seen in
**Core Concept**
Kussmaul's sign is a clinical finding characterized by an increase in jugular venous distension (JVD) with inspiration, indicating right-sided heart failure or constrictive pericarditis. This occurs due to the increased venous return to the right heart during inspiration, which the failing right heart is unable to accommodate.
**Why the Correct Answer is Right**
Kussmaul's sign is not seen in conditions where the increase in venous return to the right heart during inspiration is compensated by the increased capacity of the right heart or other mechanisms. The correct answer will be a condition that does not fit this criterion.
**Why Each Wrong Option is Incorrect**
**Option A:** Constrictive pericarditis - This condition is characterized by the scarring of the pericardium, which restricts the expansion of the heart during diastole, leading to an increase in JVD with inspiration.
**Option B:** Right ventricular infarction - This condition leads to a decrease in the contractility of the right ventricle, resulting in a failure to accommodate the increased venous return during inspiration, thus leading to Kussmaul's sign.
**Option C:** Pulmonary embolism - This condition can lead to a sudden increase in pulmonary artery pressure, which can cause a right ventricular strain and lead to Kussmaul's sign.
**Clinical Pearl / High-Yield Fact**
When assessing a patient for Kussmaul's sign, it's essential to note that a normal or decreased JVD with inspiration may indicate a hyperdynamic circulation, such as in anemia or sepsis, where the increased cardiac output compensates for the increased venous return during inspiration.
**Correct Answer: D.**