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310 Exam 3

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Exercise Science
ES 310

ES 310 Exam 3 11/25/13 1. An EKG is used to diagnose cardiac function (T/F)? 2. What is the best measure of cardiac function? BP??? 3. In the normal heart, what does SA node discharge result in? depolarization of atria (P-wave) -contraction of the heart -Calcium influx 4. What 5 things should you evaluate when interpreting an EKG strip?? -Rate –Rhythm -axis -hypertrophy -infarction 5. mean wave of depolarization heading away from positive electrode, direction will the deflection be (+ or -)? 6. What structure must the atrial wave of depolarization pass through in order for the ventricles to depolarize? 7 . What structure(s) does the wave of depolarization pass through that allows both ventricles to depolarize essentially simultaneously? 8 . Atrial depolarization is characterized by what on an EKG tracing? Pwave 9 . Ventricular depolarization is characterized by what on an EKG tracing? QRS complex 10 . What is the PR interval? What is the normal duration? 0.12 – 0.20 normal if 100, irregular ventricular rhythm - COPD - no single foci achieve dominance so all of them pace together Atrial Fibrillation: irregular ventricular rhythm not of a healthy young individual continuous chaotic atrial spikes Result of multiple irritable atrial foci Parasystolic- entrance is blocked so foci cant be overdrive-suppressed= all pace at once Escape Rhythms: Atrial Junction Ventricular Escape Rhythm: foci establishes the overdrive suppression from SA node and paces at its rate. -SA node stops entirely and inherently paces at rate which produces an escape rhythm Escape Beat: foci escapes overdrive suppression to emit one beat. -Pause in pacing is brief and foci emit one beat before sinus rhythm returns -atrial escape beat: pause before P-wave Atrial escape Rhythm occurs after sinus arrest (60-80 bpm) still p-wave but looks different Junctional escape rhythm “isojunctional” (40-60bpm) -no p-wave or inverted p-wave - inverted p-wave
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