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14 Cards in this Set

  • Front
  • Back
Which artery supplies blood to the SA node?
circumflex artery
What are the three internodal pathways between the SA node and the AV node?
• Anterior (Bachmann's)
• Middle (Wenckebach's)
• Posterior (Thorel's)
Which artery supplies blood to the AV node in the majority of people?
right coronary artery
Which arteries provide blood flow to the bundle of His?
braches from the anterior and posterior descending coronary arteries
What occurs during depolarization?
• cell membrane suddenly becomes selectively permeable to sodium
• sodium ions enter the cell resulting in a sharp rise of intracellular potential
What occurs during repolarization?
• reestablishment of the resting membrane potential
• membrane permeability to potassium increases allowing potassium ions to move outward across the membrane
Name and describe the 5 phases of cardiac action potential?
• Phase 0: fast sodium channels in the cell membrane are stimulated to open, resulting in the rapid influx of sodium

• Phase 1: signifies inactivation of the fast sodium channels w/ an abrupt decrease in sodium permeability

• Phase 2: plateau phase; influx of calcium into the cell through slow Ca channels; coincides with ST segment

• Phase 3: rapid depolarization; influx of calcium and sodium stops; increase in potassium permeability; potassium moves out

• Phase 4: resting membrane potential
What does the P wave represent?
atrial depolarization
What does the PR segment represent?
delay in AV node
What does the QRS represent?
ventricular depolarization
What does the T wave represent?
ventricular repolarization
Name and describe the 4 inherent poroperties of the cardiac conduction system that can contribute to arrhythmias
• automaticity: the ability of certain cells to initate an impulse or action potential spontaneously
• excitability: the ability of a cell to respond to an impulse and generate an action potential
• conductivity: the ability to conduct impulses
• refractoriness: the extent to which the cell is able to respond to an incoming stimulus
What is pulse deficit?
the difference between the apical rate and the palpable peripheral pulses
What is the most common chronic arrhythmia?
atrial fibrillation