Telemetry & ECG questions & answers graded A+ 2023/2024

Telemetry & ECGMechanical & Electrical Activity - correct answer -Correlation between the electrical and mechanical functions of the heart -Electrical activity stimulates the heart to contract -Electrocardiogram (ECG) show both functions -Electrical pulse = action potential Cardiac monitoring is used to: - correct answer -Diagnose dysrhythmias -Chamber enlargement -Mycoardial ischemia or infarction -Monitor effects of electrolye imbalances of medication administration -Cardiac electrical activity Cardiac electrical activity can be monitored by - correct answer ECG. 12 - lead, ambulatory (Holter monitoring), or telemetry For continuous monitoring or telemetry most monitors use 2-4 electrodes. These electrodes create an imaginary line, called a lead, that serves a reference point from which the electrical activity is viewed. A lead is like an eye of a camera - it has a narrow peripheral view, looking only at the electrical activity directly in front of it. - correct answer ECG can show - correct answer ischemia, infarction, enlarged cardiac chambers, electrolyte imbalances, drug toxicity. Placing Telemetry Electrodes - correct answer Clean skin. Clip hair as necessary. Smoke over fire, brown middle. White Right, snow on the grass. Placing EKG Electrodes - correct answer Client needs to remain still and breathe normally. Properties of Cardiac Cells: - correct answer Conductivity Contractility Automaticity Excitability Refractoriness Conductivity - correct answer transmit electrical impulses across cell membranes and from cell to cell Contractility - correct answer A/V muscle cells shorten fiber lengths to propel blood forward during contraction Automaticity - correct answer Ability of cardiac cells to initiate an impulse (primary pacemaker cells) Excitability - correct answer Ability to respond to stimulus and then depolarize Refractoriness - correct answer Cells unable to respond to stimulus until recovered from previous stimulus (repolarization) Depolarization - correct answer normally negatively charge cells developing a positive charge. Depolarization produces mechanical contractions. Pacemaker function - correct answer Although the SA node and AV node ordinarily initiate the pacing of the heart, all of the cells have the capability of doing so. P wave - correct answer atrial depolarization (contraction)