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Cardiac - Basic EKG Interpretation Workbook.doc - Basic EKG...

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Basic EKG Interpretation:Normal Sinus Rhythm(NSR)NURS 210Rules for NSR:Regularity:The R-R intervals are constant; the rhythm is regular.Rate:The atrial and ventricular rates are equal; heart rate is between 60 – 100 bpm.P wave:The P waves are uniform. There is one P wave in front of every QRS complex.PR interval:The PR interval measures between 0.12 – 0.20 seconds---constant from beat to beat.QRS:The QRS complex measures between 0.04 – 0.10 seconds.Sinus Tachycardia1.Rate: Over 100 beats per minute.2.Rhythm: Regular3.P waves: Normal, and precede each QRS complex.4.PR interval: Normal, indicating that conduction from the SA node through the ventricles innot disturbed.5.QRS: NormalSinus Bradycardia1.Rate: Less than 60 beats per minute.2.Rhythm: Regular3.P waves: Normal, and precede each QRS complex.4.PR interval: Normal5.QRS: Normal
Terminology:ArrhythmiaDisturbance of cardiac rate, rhythm or conduction.ArtifactsFalse electrical disturbance, noted on monitor that is noncardiac in origin.Examples: loose electrodes, muscle tremor, or outside electrical interference.AutomaticityThe ability of the cell to spontaneously generate and discharge an electricalimpulse.AV NodeA small mass of special fibers between the atrial and ventricles leading to theBundle of His.Bundle of HisSmall band of atypical cardiac muscle fibers that disperses the atrial contractionrhythm to the ventricles.ConductivityAbility of the cell to transmit an electrical impulse from one cell to another.ContractilityAbility of the cell to shorten and lengthen its muscle fiber.DepolarizationReversal or cellular polarity resulting in discharge of electricity or “action”creating muscular contraction.DiastoleThe period of relaxation of the heart muscle when the chambers are being filledwith blood.Ectopic beatImpulse that originates outside of the normal conduction pathway – the impulsedoes not originate in the SA node.Examples:1.PVC’s – premature beats originating from the ventricles.2.PAC’s – premature beats from the atrial.3.PJC’s – premature beats from the AV node.ElectrodesA flat surface device that is in contact with the skin to pick up electrical impulsesthat originate in the heart and relay the information to monitoring equipment.Electrocardiography(ECG or EKG)The making of graphic records produced by electrical currents originating in theheart.ExcitabilityAbility of the cell to respond to an electrical impulse.ExtensibilityAbility of the cell to stretch.Pacemaker(physiological)The SA node.ParasympatheticNervous System(PNS)Acts to slow the heart rate.Purkinje’s fibersMuscular fibers forming a network in the subendocardial tissues of the ventricles;they conduct stimuli from the atrial to the ventricles. They form the last part ofthe cardiac conduction system.

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Term
Fall
Professor
NoProfessor
Tags
Cardiac electrophysiology, Electrical conduction system of the heart, QRS

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