MEDCA EKG PRACTICE QUESTIONS AND ANSWERS 2024.

A device on the skin that picks up electrical impulses given off by the heart is known as electrode The heart is located on the left side of the chest The body returns oxygen-poor blood to the heart via the vena cavae In lead l, activity of the heart is being measured from the right arm to the left arm The human heart weighs approximately 11 ounces What position should the patient be in for an ECG supine Where is the chest electrode V2 located at the fourth intercostal space at the left margin of the sternum Lead l, ll, lll are called standard leads The right and left atrium are the __________chambers receiving The atria contains what kind of blood both oxygenated and deoxygenated blood The __________ valve separates the left ventricle from the aorta aortic The __________ regulate the flow of blood into and out of the proper chambers valves Which electrode is used as a ground reference right leg The standard ECG consists of how many leads 12 The contraction of the heart muscle is cause by the flow of ___________ through the muscle tissue electrical impulse The __________ pressure is the pressure inside the arteries during ventricular contraction; when blood is pumped from the heart to the body systolic The ECG tracing should be performed in a quiet environment because interference is minimized (True or False) The ECG records the actual image of the heart false The hardest working chamber if the heart is the left ventricle What is the term used to refer to an electrocardiogram that is within normal limits normal sinus rhythm The augmented leads are unipolar The epicardium is the outer layer of the heart wall The ability of the pacemaker cells of the heart to create an electrical impulse without being stimulated from another source automaticity The precordial leads include leads V1 to V6 The QRS complex represents contraction of the ventricles The "rhythm strip" is usually lead lead ll (True or False) An ECG can be used to determine blood pressure false The heart has how many valves four: mitral, tricuspid, aortic, pulmonic If the SA node does not simulate electrical impulses in the heart, this function is usually taken over by AV node Which wave is the first wave of the cardiac cycle p wave Which wave represents repolarization of the ventricles t wave What are artifacts interference picked up by the ECG machine (True or False) Patient psychology can be more important in obtaining a diagnostic ECG than the mechanics of administering ECG true Name the condition in which the heartbeat is too rapid, and the rhythm is regular sinus tachycardia The part of the conduction system of the heart that is conducting the impulses from the AV node to the ventricles is the bundle of his Leads V5 and V6 show what view of the heart Lateral If purkinje fibers produce the electrical impulse, the EKG would show a heart rate of 20 - 40 bpm Infraction occurs when the heart muscle is dead due to lack of oxygen What causes sinus bradycardia dysfunction of the sinoatrial node; when the sinoatrial node fires less than less than 60 During atrial flutter, the atrial beats could fire as many as how many times per minute 250 - 450 bpm Identify the true statement(s) about sinus tachycardia - normal response to exercise, stress, fright, flight, anger - increased sympathetic tone with increased catecholamine release - beta blockers are useful treatment option if the cause is sympathetic overactivity