PAT 20A/B Study Guide - Midterm Guide: Valvular Heart Disease, Coronary Artery Disease, Pulmonary Circulation
5 Jan 2017
School
Department
Course
Professor
Document Summary
Impaired cardiac pumping; heart is unable to pump adequate amount of blood to meet metabolic needs . Associated with long standing htn and cad . This is because as arterial pressure increases in the systemic circulation, it gets harder for the left ventricle to pump blood out into that hypertensive systemic circulation. To compensate the left ve(cid:374)tri(cid:272)le (cid:271)ulks up, a(cid:374)d it"s (cid:373)us(cid:272)les hypertrophy or grow so that the ventricles can contract with more force. The increase in muscle mass means that there is a greater demand for oxygen. The coronaries get squeezed down by this extra muscle so that even less blood is delivered to the tissue. More demand and reduced supply means that some of the ventricular muscle starts to have weaker contractions leading to systolic failure. Results from any structural or functional disorder of the heart. Anything that reduces the pumping ability of the heart. Oxygen demand is higher than what your body can meet with.
