Heart #5
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| Normal resting values: | HR = 75 beats/min & SV = 70 ml/beat
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| cardiac reserve means: | diff bet resting and maximal CO
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| electrocardiogram | ECG formerly EKG is a recording of electrical changes that accompany the cardiac cycle.
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| ECG reveals action of heart thru: | 3 distinguishable waves called: deflection waves
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| the 3 waves are: | P wave, QRS wave and T wave
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| P wave is a sm upward wave: | represents movement from SA node thru atria
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| QRS wave-downward deflection followed by:: | upward triangular wave that ends as a downward wave. reps: ventricular depolarization. preceeds V contraction
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| T wave - dome shaped; V repolarization. the dicrotic notch: | is a brief rise in pressure at end of T wave caused by closing of SL valves
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| 2 intervals are: | P-R interval AND Q-T interval
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| P-R interval measures: | time from start of atrial excitation to start of V excitation
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| Q-T interval | start of V depolarization thru contraction and repolarizationc
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| pericarditis | inflammation of pericardiuma
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| Valve Stenosis | hardening of a valve, aften the Mitral valve
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| angina Pectoralis | blockage of coronary arterial circulation
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| Mycardial infraction | heart attack; coronary
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| arrhythmias | loss of coordination of A or V contractions
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| fibrillation | rapid & irregular out of phase contractions
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| murmurs | sloppy valves allowing backwash into upper chambers
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| hypo calcemia | low or reduced levels of ionic calcium. prob W/contractions
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| tachycardia | abnormally fast over 100 BPM
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| bradycardia | slow heart rate, 60 BPM or less
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| congestive H failure | inadequate B circulation due to poor pumping action; tissur needs are not met
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| endocarditis | inflammation of endocardium usually from bacterial or fungal infections
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| cardiac arrest | complete stop of heartbeat
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| mitral valve prolapse | genetic valve disorder; incompetant flaps; may weaken heart
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| foramen ovale & dustus arteriosus | incomplete closure (remain open after birth)
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| tetraology of fallot: | pulmonary stenosis; patent ductus arteriosus, and enlarged R V and ventricular septal defectde
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| transposition of G vessels: | aorta and pulmonary are reversed
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| AV septal defect | shunt bet L & R V creates push into pulmonary instead of systemic
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Created by:
Jean and Study Pals