NSG 3336 Lecture Notes - Lecture 29: Superior Vena Cava, Atrioventricular Node, Heart Valve
Document Summary
Almost all are attributed to one or more risk factors > age is primary. Older adults have fewer pacemaker cells in sa node, or fat may have deposited around node. Slowed impulse transmission > calci cation around the av node. Dysrhythmia = a disruption in the cardiac conduction pathway or disorders of the electrical impulse conduction within the heart. Some result in deviations from a normal hr and/or rhythm = decreased co. Electrical impulse is measures sit moves between two poles or points. Lead ii mimic the hearts natural electrical direction > best to identify. Amplitude is measured on the vertical axis and time is measured on horizontal. P wave should be no longer than 0. 10 sec length and 2. 5 mm in height. Qrs greater than 0. 10 sec & 2. 5 mm = something occurring in the ventricles. T wave is not used for interpreting rhythm > monitoring extreme electrolyte imbalances, disturbance with myocardial oxygen supply, or other cardiac disorders.
