leads I, II, and III, voltage is measured as a difference in between two electrodes
myocardial cells
contract in response to elec stimuli and pump blood
what is paroxysmal atrial tachycardia
160-240 bpm, ectopic foci in the atrium takes over as pacemaker, sudden onset and ending, may cause hypotension, CHF, or ischemic episode, or recent/pre existing MI
*bradycardia rate
<60
ST Segment
begins at end of QRS and ends at beginning of Twave, normally flat
Infarctions
blockage of one or more coronary vessels leading to regionalized tissue ischemia and tissue death
atrial flutter usually resolves how
deteriorates to atrial Fib or spontaneously returns to normal
what does QRS represent
ventrical depolarization
*F-waves
flutter waves, caused by rapid contractions of atria upon stimulation by re-entry or accelerated automaticity
