HLSC 2461U Lecture Notes - Tachycardia, Ventricular Fibrillation, Cardiogenic Shock
Document Summary
2 atrialventricular (mitral) and 2 in the great vessels (pulmonary & aortic valve: stenosis. Doesn"t open fully, passage of blood is impeded (finds more resistance) When closed, they can close completely or incompletely. Example: in the mitral valve (the most common one), blood has difficulty passing from l atrium to l ventricle, happens during ventricular diastole, l ventricle will not be fully filled, when it contacts (systole), When a valve closes and it doesn"t close completely. Valve will allow retrograde flowing of blood. Example: in aortic valve, when it closes during ventricular diastole, blood will leak back into the left ventricle: valvular prolapse. Prolapsed mitral valve: when the valve closes (during systole), normally closes tightly but in this case one of the leaflets blooms up into the left atrium. Leaflet pushing into the left atrium can increase the pressure in the l atrium (arrhythmias), pressure in subendocardium. Nodules grow in the borders of the leaflets causing an inflammatory reaction.
