EKG Certification Exam

EKG Certification Exam What does the P wave represent? - atrial contraction Define: Repolarization - when the heart recovers electronically Define: Depolarization - contraction of cardiac cells What does the QRS wave represent? - ventricular contraction What does the T wave represent? - ventricular relaxation Which wave only occurs occasionally in some patients? - the U wave What does the vertical line on the EKG represent? - voltage What does the horizontal line on the EKG represent? - time What is a baseline? - the flat line that separates the various waves What is one box equal to? - .04 sec What are 5 large squares equal to? - .2 sec What does BPM stand for? - beats per minute What is electrolyte? - substance used to conduct current better What forms does electrolyte come in? - gels, lotions, pastes, adhesive pads Why is electrolyte necessary? - because the skin is a poor conductor of electricity What are electrodes? - sensors that detect electrical impulses on the body surface What are electrodes made of? - metal or other conductive material What are lead wires? - the wires that connect the sensors to the machine How can older electrocardiograph machines be adapted or converted to operate with the current self-adhesive electrodes? - order a set of alligator clips from the manufacturer How many sensors are on a standard EKG? - 10 How many leads do the sensors record? - 12