A patient with substernal chest pain for 30 minutes, pale and moist skin, blood pressure 70/40, ST elevation in lead 3, and clear lung sounds is most consistent with which diagnosis?

A patient with substernal chest pain for 30 minutes, pale and moist skin, blood pressure 70/40, ST elevation in lead 3, and clear lung sounds is most consistent with which diagnosis?

• A. Hypovolemic shock
• B. Cardiogenic shock
• C. Septic shock
• D. Anaphylactic shock

Answer: (B)

The main idea here is cardiogenic shock caused by an acute myocardial infarction. The substernal chest pain lasting for 30 minutes, along with ST elevation in the inferior lead (lead III), points to an acute inferior-wall MI, typically from a right coronary artery occlusion. When the heart’s pumping ability drops after a large MI, cardiac output falls and tissue perfusion collapses, producing cold, clammy skin and severe hypotension like 70/40. Lung sounds being clear fits with cardiogenic shock in some cases, especially early or when the right ventricle is involved, because pulmonary edema isn’t always present right away. The key is the combination of chest pain with MI-type ECG changes and hypotension due to pump failure, rather than a primary loss of circulating volume or a primary vasodilatory state. This differs from septic shock (which usually has warm or flushed skin early and infection signs) and anaphylactic shock (which involves airway symptoms and widespread vasodilation). Hypovolemic shock would involve volume loss and a different clinical pattern, though it can also cause cold skin and low blood pressure; the ECG evidence of an acute MI makes cardiogenic shock the best fit.

The main idea here is cardiogenic shock caused by an acute myocardial infarction. The substernal chest pain lasting for 30 minutes, along with ST elevation in the inferior lead (lead III), points to an acute inferior-wall MI, typically from a right coronary artery occlusion. When the heart’s pumping ability drops after a large MI, cardiac output falls and tissue perfusion collapses, producing cold, clammy skin and severe hypotension like 70/40.

Lung sounds being clear fits with cardiogenic shock in some cases, especially early or when the right ventricle is involved, because pulmonary edema isn’t always present right away. The key is the combination of chest pain with MI-type ECG changes and hypotension due to pump failure, rather than a primary loss of circulating volume or a primary vasodilatory state.

This differs from septic shock (which usually has warm or flushed skin early and infection signs) and anaphylactic shock (which involves airway symptoms and widespread vasodilation). Hypovolemic shock would involve volume loss and a different clinical pattern, though it can also cause cold skin and low blood pressure; the ECG evidence of an acute MI makes cardiogenic shock the best fit.