Electrocardiogram Questions and Answers 100% Pass

Electrocardiogram Questions and Answers 100% Pass The measurements of the smallest blocks of standard ECG graph paper are: 1 mm wide by 1 mm high Lead 1 of the ECG tracing is the heart view between the: Right arm (RA) and the Left arm (LA) Lead 1 is designed as the first lead, starting at the top of the body with both arms In a standard ECG, lead V3 is located: Midway between position V2 and positoin V4 -After the location of V2 and V4 have been determined, V3 is located on an imaginary line midway between V2 and V4 Proper preparation of the patient includes the following EXCEPT: Place the electrodes or sensors over bony prominences of the arms and legs where the electrical activity is more easily conducted. The height of a normal standardization mark on an ECG tracing is: 10 mm (the mark should have a square top--most machines automatically place a standardized mark at the beginning of the tracing. AC interference is an artifact in an ECG tracing that means: There is ELECTRICAL interference in the room (computers or other machines in the room can cause this) The cardiac testing procedure that requires the patient to keep a diary of daily activities is an: Holter monitor (the Holter monitor is a small, portable ECG device that a person wears to monitor their daily activies--usually for 24 hours) The ECG grounding lead is the lead attached to the: Right leg (the grounding lead helps to reduce alternating current (AC) interference) The ECG tracing is printed on graph paper at a standard speed for an adult of: 25 mm/sec. (each block on the ECG graph paper represents 1mm, at the standard rate the paper advances 25 mm (25 small squares) each second) Lead II of the ECG tracing records the electrical activity through the heart from the: Right arm to Left arm (the standard limb leads--lead I, lead II, and lead III--form an imaginary triangle when lines connect the reference points) During the electrical heart cycle, REPOLARIZATION refers to the: Recovering phase (during repolarization, negative ions are transferred to the inside of the cell, and the positive ions return to the outside) The chest lead VI is located at which intercostal space? Fourth (VI is located at the fourth intercostal space at the right margin of the sternum) The image traced on the ECG paper is made by a: Heated stylus tip that melts the coating of the paper. -(the stylus is heated and melts away the coating, exposing the dark paper underneath) The purpose of adjusting the normal standard to one-half standard is to: Decrease the size of the patient's ECG tracing -(the setting can be changed from the normal 10mm-high to one-half standard 5mm high,used if the tracing is so large that is goes off the paper) When a patient has trouble relaxing or cannot remain still for the ECG, the artifact that may occur is: Somatic muscle tremor (somatic muscle tremor appears as a static line in between the complex on the ECG paper--keep patient warm and comfortable) The type of cardiac procedure that requires the use of a treadmill is: Cardiac stress test The medical assistant should gather all the appropriate patient data before the ECG procedure EXCEPT: Date of the persons first ECG procedure (its not important to know at this time) The leads aVR, aVL and aVF are the: Augmented voltage leads The QRS complex of the ECG tracing represents: Ventricular depolarization (represents the contraction of the ventricles as positive ions enter the cells and negative ions leave them---dopolarization is the electrical activity that causes the heart to contract) The ECG marking code that represents lead VI is: One dash and one dot (all of the chest leads, VI through V6, are identified as a dash followed by the number of dots that correspond with the number of the lead) A long strip of QRS complexes of a certain lead used to define certain cardiac arrythmias is a (n): Rythm strip (A rythm strip is run to give the physician a tracing longer than the lead length. This allows the physician to determine whether the patient has an abnormality that only shows up occasionally and not with each beat) If the electrodes are too loose on the patient, what artifact might you find on the ECG tracing? Wandering baseline (a wandering baseline appears as a tracing that wander back and forth the bottom to the top of the paper. The normal baseline should stay within the middle of the paper) The purpose of setting the ECG paper speed at 50 mm/sec is to: Helps record rapid hearbeat (when a patient has a rapid heartbeat, the faster speed allows the complexes to space farther apart on he paper, it makes it easier to read) The P wave represents the: Atrial depolarization (the P wave is the first waveform of the ECG complex and represents the electrical activity that spreads from the SA node through the atria, causing atrial contraciton, during this time the cells are depolarizing) What should the medical assistant tell a patient if the patient asks if he or she will feel any discomfort from the ECG prodecures? The ECG procedure does not hurt and does not send electrodes through you.