BIOL 221 Lecture Notes - Lecture 2: Cardiac Glycoside, Blood Pressure, Verapamil
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11 Feb 2020
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In summary, factors that increase esv include increased edv due to increased filling time or increased venous return, decreased afterload, and increased contractility due to positive inotropic agents. In summary, decreased edv due to decreased time for filling (increased heart rate or changes in rhythm) or decreased venous return, increased afterload or decreased contractility decrease stroke volume. Increased afterload is a greater pressure against which heart has to work and is due to increased mean arterial pressure. Decreased contractility would be due to negative inotropic agents. Used to treat congestive heart failure (chf), atrial arrhythmias. Heart strength can be controlled clinically by drugs such as digitalis (e. g. , digoxin) and calcium-channel blockers (e. g. , verapamil). Digitalis and other cardiac glycosides make calcium more available within the cell. They are used to treat congestive heart failure (chf) and atrial arrhythmias because they increase strength and decrease heart rate. Calcium-channel blockers inhibit calcium influx, thereby decreasing strength of contraction.
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