UWorld CardioPulmonary

Question 1

Why are Ca++ channel blockers (esp. dihydripiridines like nifedipine) contraindicated in MI?

Answer 1

peripheral vasodilation –> reflex tachycardia

Question 2

What are the two differential diagnoses for wide-complex tachycardia?

Answer 2

V-tach or SVT w/ aberrancy

Question 3

What is the differential diagnosis for a wide-complex premature beat?

Answer 3

PVC or aberrantly conducted supraventricular beat

Question 4

Define aberrancy.

Answer 4

Widened QRS d/t a belay or block in intraventricular conduction.

Question 5

What is the Tx for stable ventricular tachycardia?

Answer 5

amiodarone IV

Question 6

What is the Tx for unstable V-tach?

Answer 6

synchronized cardioversion

Question 7

Which heart medication carries a risk of pulmonary toxicity and should be avoided in pts with pulmonary disease?

Answer 7

amiodarone

Question 8

What is the FEV1/FVC required to Dx airway obstruction?

Answer 8

<0.75

Question 9

What percent increase in FEV1 indicates a bronchodilator response (when using percentages)?

Answer 9

12%

Question 10

What PaO2 corresponds to an SaO2 of 90%?

Answer 10

60 mmHg