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ECK/EKG

Respiratory Ch. 6 Gary White

QuestionAnswer
depolarization when the muscle cells are stimulated and contract (exchanging potassium for sodium) cells become more negatively charged on their outside surface
repolarization the contraction after depolarization, (exchange sodium for potassium) cells become positive on their outside surface
What does the conduction system of the heart? SA node (sinoatrial node), AV node (atrioventricular node), bundle of HIS, right and left bundle branches and the Purkinje fibers
Known as the heart's pacemaker? SA node
P wave occurs when the atria depolarize
QRS complex composed of the Q, R, and S waves represents depolarization of the ventricles. During ventricular depolarization, the atria repolarize.
Can you see the repolarization of the atria? No, the repolarization of the atria is "lost" or not seen in the QRS complex. It is hidden within the QRS.
T wave repolarization of the ventricles
Sinus bradycardia is a normal sinus rhythm at a lower rate (less than 60 beats per minute). - sinus bradycardia may indicated sinus node disease or increased parasympathetic tone or may be caused by drugs (digitalis)
Atrial fibrillation (A-fib) not an organized stimulation of the atria from the SA node. atrial depolarization does not occur, there is no P wave the atria never fully contracts. May be caused by underlying heart disease, hyperthyroidism, mitral valve disease, or even pulmonary
Premature Ventricular Complexes (PVCs) - occurs when the ventricles are stimulated prematurely. - Wide QRS complex. widening occurs because one ventricle depolarizes before the other, out of sequence. - PVCs are usually followed by a long pause before the next beat occurs. - occur randoml
Bigeminy refers to the occurrence of PVCs every other beat (every second beat).
Created by: amers72