*NURSING > EXAM REVIEW > MED SURG 2 EXAM 1 - Comprehensive review of Professor Martinez Medical Surgical Nursing II Exam Awes (All)

MED SURG 2 EXAM 1 - Comprehensive review of Professor Martinez Medical Surgical Nursing II Exam Awesome review! graded A

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MED SURG 2 EXAM 1 Ch. 25 – ASSESSMENT OF CARDIOVASCULAR FUNCTION Conduction System • Automaticity = ability to initiate an electrical impulse • Excitability = ability to respond to an electr... ical impulse • Conductivity = ability to transmit an electrical impulse from one cell to another SA node à AV node à bundle of his à right bundle branch à left bundle branch à purkinje fibers *SA node is the primary pacemaker of the heart Depolarization: electrical activation of cell caused by influx of sodium into cell while potassium exits cell Repolarization: return of cell to resting state caused by re-entry of potassium into cell while sodium exits Refractory periods ► Effective refractory period: phase in which cells are incapable of depolarizing ► Relative refractory period: phase in which cells require stronger-than-normal stimulus to depolarize Cardiac Action Potential Phases (won’t ask but understand) Phase 0 = Na comes into the actual cell (RAPID depolarization, SODIUM IN) Phase 1 = early cell repolarization – K+ coming out of the cell (POTASSIUM OUT) Phase 2 = plateau phase (rate of repolarization slows); Ca+ ENTER CELL Phase 3 = complete repolarization (return of cell to resting state) Phase 4 = resting phase before the next depolarization Aorta has the highest pressure (biggest) high force…pressure in left ventricle + aorta highest pressure is higher pressure in the cardiac system ** Majority of MI occurs in left ventricle! [Show More]

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