Electrical Acitivty Of Heart Part 5

Question 1

AV node block must be treated if the resulting ventricular rate is too _____ to maintain adequate blood flow to body

Answer 1

Low

Question 2

What type of anti arrhythmic drug acts by binding to some of the voltage-gated Na+ channels in cardiac muscles and counteracts membrane depolarization and action potential formation?

Answer 2

Local anesthetics- lidocaine

Question 3

What type of anti arrhythmic drug bind to some of the L-type Ca2+ channels and prevent them from opening?

Answer 3

Calcium channel blockers

Question 4

What type of anti arrhythmic drug:
Lower the plateau
Lengthen the action potential
DECREASE strength of cardiac contractions

Answer 4

Calcium channel blockers

Question 5

What type of anti arrhythmic drug:
Act by inhibiting the Na+, K+ pump in cell membranes

Answer 5

Cardiac glycosides

Question 6

What type of anti arrhythmic drug:
Act on the CNS and cause increase in parasympathetic tone
Allow for more Ca2+ than normal to accumulate inside cardiac cells= STRONGER cardiac contractions

Answer 6

Cardiac glycosides

Question 7

What type of anti arrhythmic drug:
DECREASE heart rate
Lengthening refractory period
Slowing conduction of action potentials
Reverse sympathetic-induces increases in cardiac contractility

Answer 7

Beta-adrenergic antagonists

Question 8

What type of anti arrhythmic drug:
Prevent the activation by norepinephrine from sympathetic nerves or by circulating epinephrine and norepinephrine from the adrenal medulla

Answer 8

Beta-adrenergic antagonists