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Stack #33654

Heart #5

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

 



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