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13 Cards in this Set

  • Front
  • Back
Dysrhythmias are categorized by ___________ and _______________________.
type of rhythm abnormality
What is the pacemaker of the heart?
SA - sinoatrial node
What is automaticity?
the ability to spontaneously generate an electrical impulse known as an action potential, without instruction from the nervous system.
Normal Sinus Rhythm
SA node generates a new action potential (approx 75 times every minute under resting condition)
A cell having a negative membrane potential is said to be _______________.
In resting cells, sodium and calcium are found in higher concentrations (inside or outside) the cell.
What is the pharmacological strategy used to terminate or prevent dysrhythmias?
Block potassium, sodium, and calcium ion channels
What is the action of sodium channel blockers?
slows the rate of impulse conduction through the heart.
What is the action of beta-adrenergic blockers?
reduce automaticity as well as slow conduction velocity in the heart
What is the action of potassium channel blockers
prolong the refractory period of the heart
What is the action of calcium channel blockers?
slow conduction velocity
Calcium channel blockers are only effective against _____________ dysrhythmias.
Drugs that do not act by blocking ion channels include ___________, __________, and __________.
adenosine (Adenocard, Adenoscan)
digoxin (Lanoxin)
ibutilide fumarate (Corvert)