Autonomic Effects on HR and CV

Question 1

CHRONOTROPIC

Answer 1

SA NODE — HEART RATE

negative chronotropic effects — dec firing rate of SA node — DECREASED HR

positive chronotropic effects — inc firing rate of SA node — INCREASED HR

Question 2

DROMOTROPIC

Answer 2

AV NODE - CONDUCTION VELOCITY

affected by inward calcium current

negative dromotropic effects — dec conduction velocity through AV node

positive dromotropic effects — inc conduction velocity through AV node

Question 3

IONOTROPIC

Answer 3

SV — VENTRICULAR CONTRACTION

Question 4

LUSITROPIC

Answer 4

RATE of RELAXATION

Question 5

B1 stimulation will cause

Answer 5

STRONGER (positive ionotropes)
BRIEFER (positive lusitropes)
FREQUENT (positive chronotropes)

Question 6

FACTORS THAT INCREASE CONTRACTILITY (POSITIVE IONOTROPICS)

Answer 6

INCREASED HR
SYMPATHETIC NS STIMULATION
CARDIAC GLYCOSIDES (Digoxin)