CEN ENA Online Review Study Guide

Sympathetic nervous system effects - Answer- increases HR, causes vasoconstrictions, increases contractility CO= - Answer- SV+HR= HR increased by - Answer- PNS stimulation HR increased by - Answer- SNS stimulation preload - Answer- volume of blood that results in pressure or stretch of the vents during diastole, affected by amount of venous return to heart stroke volume + affected by - Answer- preload contractility stroke volume - affected by - Answer- afterload preload - affected by - Answer- loss of intravascular volume- hemorrhage, diuresis, v/d, third spacing, redistribution of blood flow preload + affected by - Answer- venous return peripheral vasocxn alpha adrenergics (epi, norepi, dopamine) afterload increases with - Answer- vasocxn mechanical obstruction of vents (pulmonic/aortic stenosis) HTN hypothermia shock compensatory mechanisms +Chronotropic medications - Answer- Atropine Dopamine Epinephrine Isoproterenol Milrinone Theophylline Dopamine effects - Answer- Low doses - increases contractility and HR, which increases CO and BP Higher doses cause vasoconstriction that further increase BP What must be c