ECG Test Exam With 100% Correct Answers

ECG Test Exam With 100% Correct Answers -graphy - answerprocess of recording -metry - answerprocess of measuring EKG/ECG - answerrecording of the electrical impulses as they go through the heart as wave deflections on an instrument called an electrocardiograph. The record or recording is called an electrocardiogram Ventricular fibrillation (V-fib) - answeroccurs when the ventricles quiver uncontrollably. They are essentially ineffective at pumping any blood. The patient has no pulse, is not breathing, and is unresponsive. This is the most critical life threatening arrhythmia. Cardioversion with a defibrillator is necessary to restore normal function of the electrical conduction system. Premature Atrial Contraction (PAC) - answerOccurs when the atria contract sooner than they should. The P wave can be abnormally shaped, or an extra P wave can be seen. PACs can be seen in people who smoke or consume large amounts of coffee. An occasional PAC is not abnormal. More than 6 PACs in 1 minute is considered abnormal. Polarized State - answerbefore the impulse hits the cardiac cell, the cell is in the resting state, or resting potential. The inside of the cardiac cell is positively charged. There is no electrical activity seen on the ECG during the polarized state. Depolarized state - answerwhen the impulse hits the cardiac cell, large amounts of positively charged sodium ions move into the cell. The movement of sodium and potassium changes the cells charge to positive. The change, also called action potential, allows the impulse to move through the cell. Depolarization (when the impulse hits the cell) causes electrical activity on the ECG P wave appearance - answersmall "hill: (positive deflection) seen on lead II P wave summary - answeratrial depolaized P wave conduction system - answerimpulse moves from the SA node (pacemaker) to the AV node P wave mechanical action - answeratrial chambers contact and blood moves into the ventricles