NUR 3100 Lecture 18: SI -- CV, circulation, BP & Cardiac Disorders
Document Summary
Cv circulation part 2: veins: thin, flexible. Stores 2/3 of blood and has valves to prevent a backflow of blood: capillaries: _single celled; lipid soluble diffuse through membrane, water soluble diffuse through pores, endothelium functions: --_homan"s sign_________ _______: deep calf pain upon dorsiflexion. Cardiac disorders: atherosclerosis causes decreased blood flow which in turn causes ischemia of the heart, myocardial ischemia: o2 demand > o2 supply, stable angina is _predictable______________. Often presents as referred pain radiating from chest to left arm; nitro works: unstable angina is caused by plaque rupturing. Obstruction does not completely block flow but is insufficient. Global feeling of doom or distress: non st elevation of infarction (non stemi): troponin is a primary diagnostic marker, st elevation of infarction (stemi): life threatening; _troponin elevated___________ Strep antibiotics prevents this: stenosis: blood flow obstruction, _mitral________ stenosis: lv doesn"t properly fill during diastole.
