l>General Review
EKG Page
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General Concepts in EKGAs both ventricles are depolarized, from inner to outer surface, the electric present produces what tracing on the EKG.QRS complexWhat is the resting state of the heart muscle called?The polarized stateWhat is intended by polarization of a cell?The resting cell has excess potassium inside and excess sodium external, producing an ion imbalance. Selectivepermecapability of the membrane allows these ions to move ago and also forth once energy is obtainable.What is supposed by saying that there is a “potential difference” across the cardiac cell membrane?The “potential difference” throughout the cardiac cell membrane occurs as soon as there are even more electrons on one side of themembrane than on the various other, via a resulting tendency for the electrons on the crowded side to circulation throughout themembrane right into the side with the fewer electrons.What is the name of the heart"s muscle cells?.myocytesWhat is intended by depolarization of the heart?Depolarization of the heart is the orderly passage of electrical current sequentially through the heart muscle, altering it,cell by cell, from the resting polarized state to the depolarized state until the entire heart is depolarized.What is intended by repolarization of the heart muscle?Repolarization of the heart is the orderly return of each cell to its polarized state, cell by cell, until all are polarized again.When you check out an upward wave on an EKG, it represents a depolarization wave moving which means.Toward a positive electrode.The capability of the heart to geneprice a pacemaking stimuli is understand as:automaticity or autorhythmicWhat are two attributes of the EKG machine?The determination of direction and magnitude of the electrical existing developed by the heart.What anatomical areas of the heart insulate the atria from the ventricles?The mital and tricuspid valvesIf ventricular systole represents the contraction of the ventricles, what does asystole mean?This is a problem where the heart is no longer beating. You execute not view any kind of complexes or waves on the EKG.What is more vital in EKG interpretation: direction or magnitude?The direction of the heart’s existing.During depolarization, exactly how many type of different directions will existing be flowing via the heart?In a multitude of directions.If the current if flowing in a multitude of directions, how have the right to the EKG machine draw a solitary line?The stylus of the composing arm of an EKG averages all the curleas at a certain lead, for this reason giving the mean current flow.This average force is referred to as the resultant pressure. Class, remember the instance of the bull and also the solid manpulling the cart from various angles. That created a resultant force for the cart which was an average of the bull’sforce and the man’s force.Does the EKG average thousands of forces to identify the actual resultant force?YesWhat perform we contact the junction in between the QRS and the ST segment.J PointWhat is a dipole?A dipole is the potential pressure caused by an adverse and also positive electrical charge in cshed proximity.How does a dipole relate to a vector?The dipole deserve to create a vector.How does the heart’s current relate to the dipole concept?The manufacturing of present by the heart is really the manufacturing of a sequence of dipoles. As each myocardial cell isdepolarized, it produces a dipole.Why is it necessary to have the ability to describe the direction of an EKG vector?Most EKG diagnoses are based on directions.What is expected by “right” and also “left” in EKG terminology?From the suggest of check out of the patient.What is supposed by a bipolar limb lead?This lead has a positive and negative electrode placed on any type of two limbs.If you make an equilateral triangle from the 3 bipolar leads, what is it called?Einthoven’s triangle.Why have the right to the three sides of Einthoven’s triangle be shifted so that they show up to radiate from the facility of the heart?Since the limb leads are measuring current in particular directions loved one to the heart. The chest cavity is prefer a tub ofelectrons permitting current to circulation in between any type of 2 points.Why is it vital to recognize the direction of the QRS complex?Because all conduction abnormalities are manifested in the QRS complex.What is supposed by the direction of the QRS?This is the average or “mean” direction of the present.So, if the QRS is going mostly toward lead 1, what will the QRS look like in lead 1?Mostly upward bereason a positive present towards a positive lead will bring about a positive deflection.In EKG, just how carry out we say the QRS is towards a certain lead?The suppose QRS vector is traveling towards the certain lead.If for half of the depolarization the vector is traveling toward the lead and the other fifty percent of the depolarization it istraveling ameans from the lead, what will the QRS look like?EquiphasicIf the suppose vector is equiphasic, what direction is it going in recommendation to that lead?PerpendicularWhat is supposed once we say the vector is perpendicular to the lead?That it is running at 90 levels (or a right angle) to the lead.An EKG complicated that has actually as much area over as listed below the baseline is finest called?EquiphasicIf the suppose QRS is perpendicular to lead 2, what does the QRS look like in lead 2?EquiphasicIn what direction would you suppose the QRS vector to point in the frontal plane? WhyInferior and to the left.


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Since this is the direction of the primary segment of the left ventricle!What is the distinction in the AV node and AV junction?The AV juction is the percent of the AV node that has foci of automaticity.We usage the term ‘ideo’ with a number of rhythms. What does it mean?‘Idio’ is a preflex of Greek origin meaning “one’s own.”The terms sino and sinus refer to what?SA nodeWhen the SA Node generates pacing impulses at a constant undiffering rate, via cycles of equal length, the rhythmis shelp to be.RegularDoes the proximal finish of the AV Node have actually automaticity foci?No, yet, the remainder of the AV Node, well-known as the AV Junction does.What does arrhythmia mean?Without rhythm.
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