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Flashcards in cardiac electrophysiology Deck (13)
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1
Q

types of cardiac cells

A

pacemaker or non

2
Q

pacemaker cell info

A

specialized myocardial cells, in SA/AV nodes,/ his/perk.. Dif patterns, auto rhythmic

3
Q

3 sections of pacemaker AP

A

phase 4 depol, depol, repol

4
Q

phase 4 depol

A

pacemaker potential. slow rise to threshold, decreased K efflux, if current, gradual ca influx= net positive

5
Q

if current

A

slow Na influx (non spec/leaky

6
Q

depol pacemaker

A

voltage gated ca2+ efflux (dom inward current)

7
Q

repol pacemaker

A

volt gated K+ efflux

8
Q

nervous control of pacemaker parasympha:

A

ACH to av node, decrease If, decrease ca in phase 4

9
Q

nervous control of pacemaker sympha:

A

cardiac plexus, norepinephrine, increase If/ca in phase 4, decrease threshold to more neg

10
Q

non pacemaker cell info

A

not autorhythmic, 5 phase

11
Q

stages non pacemaker Ap

A

0: Na influx/voltage gated. 1: inactivate na, 2: plate, open ca in, close K out, 3: ca2+ channels close, k efflux, 4: resting pot (small k/ na)

12
Q

refractory absolute for non pacemaker

A

0-part of 3, na channel are inactive. allows time for heart to refill ( no tetany)

13
Q

conduction of AP between cells

A

gap junctions, low R ion channel, spread of depol,