NURS 224 Lecture Notes - Lecture 3: Heart Valve, Stroke Volume, Cardiac Output
20 Jan 2020
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Document Summary
Ischemia: inadequate blood supply to an organ, tissues or part of the body. Infaction: obstruction of the blood supply to an organ or region of tissue, typically by a thrombus or, embolus causing local death of tissue. Third spacing: massive fluid shift from vessels to tissues and cells. Lub (s1): closure of the av valves at the beginning of systole. Dub (s2): closure of the semilunar valves at the end of systole. Volume of blood that flows to target output. Requires adequate cardiac function, blood pressure and blood volume. Co = stroke volume x heart rate. Stroke volume: volume of blood per each heart cycle tissue. Requires patent vessels, adequate hydrostatic pressure and capillary permeability. Untreated ischemia, cell injury, cell death. Children and young adults due to trauma. Those with modifiable and nonmodifiable risk factors. Heart disease is the #1 cause of death in canada for women over the age of 55.
