Cardiology Flashcards
(258 cards)
What electrolyte is used in repolarization of the heart?
K+
What causes fast conduction through the heart?
Na+
What effect does parasympathetic stimulation have on the heart?
Slows heart rate , slows conduction, decreases force of contraction, caused by cholinergic Ach
What effect does sympathetic stimulation have on the heart?
Norepinephrine -adrenergic causes increase rate, increase force of contraction and increase irritability of foci, constricts arteries causing increase in BP
Wandering pacemaker
P wave shape varies, atrial rate less than 100, irregular vent rhythm
MAT multifocal atrial tachycardia
P wave shape varies, rate over 100’ COPD or dig toxicity
A fib
Continuous rapid firing by many atrial foci, continuous atrial spikes, count vent rate — QRS in 6 sec strip x 10
Atrial escape rhythm
60-80, atrial foci assumes pacing
Junctional escape rhythm
40-60, usually no p wave, but may have retrograde atrial polarization causing Inverted p wave
Ventricular escape rhythm
Looks like PVC’s, 20-40, P and QRS do not match
Premature atrial beat
Irritable foci, new atrial beat resets the rhythm
Preventricular beat
Vent irritability caused by low O2, low K+
V tac
A run of three or more PVC, from epi like substances
Paroxysmal atrial tachycardia
Different p wave, rate 150-250
PAT with AV block
More the one P for every QRS, dig excess
Paroxysmal junction all tachycardia
150-250, May have inverted p waves
AV node reentry
aVNRT, vicious cycle
SVT
Any tachycardia that originates above the ventricles
Torsades de pointes
250-350, low K+, long qt syndrome, looks like a twisted ribbon
Atrial flutter
250-350, saw tooth,
Ventricular flutter
250-350, single foci
V fib
Multiple foci, bag of worms
A fib
Caused by many irritable parasystolic atrial foci
WPW
Bundle of Kent, av conduction pathway causing a reentrent SVT