Cardiovascular system

Question 1

Why is AFib with RVR so detrimental to patients with severe AS?

Answer 1

They are dependent on LV filling to maintain cardiac output, and AFib with RVR gives less filling time and loss of the atrial kick.

Question 2

How much does atrial systole contribute to ventricular filling?

Answer 2

5-20% at resting HR

Question 3

What anticoagulant can be used instead of heparin in patients with HIT who require cardiopulmonary bypass?

Answer 3

Argatroban

Question 4

What is the greatest determinant of myocardial oxygen demand?

Answer 4

Heart rate

Question 5

What is the induction agent of choice in cardiac tamponade?

Answer 5

Ketamine