To reduce aortic wall stress in pregnancy for women with Marfan syndrome, clinicians should avoid which of the following?

To reduce aortic wall stress in pregnancy for women with Marfan syndrome, clinicians should avoid which of the following?

• A. Tachycardia and hypertension
• B. Hypotension and bradycardia
• C. Tachycardia and hypotension
• D. Baseline heart rate 60-70 bpm

Answer: (A)

The concept being tested is minimizing aortic wall stress by controlling heart rate and blood pressure. In pregnancy, especially with Marfan syndrome, the aorta is under more hemodynamic load due to increased blood volume and cardiac output. Wall stress on the aorta rises with higher systolic pressure and with faster pulses because each heartbeat must push against the aortic pressure and the vessel wall has less time to accommodate filling. Marfan patients have a weakened aortic wall, so reducing these forces is crucial to lower the risk of dissection or rupture. Tachycardia increases pulsatile stress and decreases diastolic filling time, while hypertension raises the systolic pressure the aorta must withstand. Together, they markedly elevate wall stress, making the combination of tachycardia and hypertension the most dangerous scenario to avoid. Maintaining a normal or near-normal heart rate (around 60–70 bpm) and controlled blood pressure helps keep wall stress to a safer level during pregnancy. Briefly, hypotension and bradycardia are not ideal for maternal-fetal perfusion, and a baseline heart rate in the 60–70 bpm range is generally acceptable, so they’re not the targets to avoid for reducing aortic wall stress.

The concept being tested is minimizing aortic wall stress by controlling heart rate and blood pressure. In pregnancy, especially with Marfan syndrome, the aorta is under more hemodynamic load due to increased blood volume and cardiac output. Wall stress on the aorta rises with higher systolic pressure and with faster pulses because each heartbeat must push against the aortic pressure and the vessel wall has less time to accommodate filling. Marfan patients have a weakened aortic wall, so reducing these forces is crucial to lower the risk of dissection or rupture.

Tachycardia increases pulsatile stress and decreases diastolic filling time, while hypertension raises the systolic pressure the aorta must withstand. Together, they markedly elevate wall stress, making the combination of tachycardia and hypertension the most dangerous scenario to avoid. Maintaining a normal or near-normal heart rate (around 60–70 bpm) and controlled blood pressure helps keep wall stress to a safer level during pregnancy.

Briefly, hypotension and bradycardia are not ideal for maternal-fetal perfusion, and a baseline heart rate in the 60–70 bpm range is generally acceptable, so they’re not the targets to avoid for reducing aortic wall stress.