Cardio Flashcards
Right ventricle
Muscular pump located behind the septum. Closes tricuspid valve, opens pulmonic valve, and propels blood into pulmonic artery and lungs.
Right Atrium
Receives deoxygenated venous blood
What are the four cardiac valves
Tricuspid, mitral (bicuspid), pulmonic, and aortic.
Tricuspid valve
Separates the RA from the RV
Mitral valve
Separates the LA from the LV
Pulmonic valve
Separates the RV from the pulmonary artery
Aortic valve
Separates LV from the aorta
Cardiac out put equals
Heart rate times stroke volume
Cardiac index
Determined by dividing the CO by the body surface area. Normal range is 2.7-3.2 L/min/m2
Stroke volume is
The amount of blood ejected by the left ventricle during each contraction
Preload is
The degree of myocardial fiber stretch at the end of diastole and just before contraction
Afterload is
The pressure or resistance that the ventricles must overcome to eject blood through the semilunar valves and into the peripheral blood vessels
Impedance is
The pressure that the heart must overcome to open the aortic valve
Paroxysmal nocturnal dyspnea
Develops after pt has been laying down for several hours. In this position, blood from the lower extremities is redistributed to the venous system, which increases venous return to the heart. A dead heat cannot compensate for the increased volume and its ineffective in pumping the additional fluid into the circulatory system. Pulmonary congestion results.
Angina onset
Sudden, usually in response to exertion, emotion, or extend in temperature.