Download EKG Interpretation: Exam Questions and Answers (2026) and more Exams Medicine in PDF only on Docsity!
Answers 2026(Verified Answers)
Normal Sinus Rhythm - correct answer ✅Impulse starts in the SA Node• Rate: Atrial & Ventricular 60-100 [normal limits]• Rhythm: Atrial and Ventricular are regular• P waves: Normal; each followed by QRS• PRI: 0.12 - 0.20 [normal limits]• QRS: 0.04 - 0.10 [normal limits] Sinus Bradycardia - correct answer ✅Impulse also starts in SA Node• These rhythms follow all the criteria for Normal sinus rhythm except for the rate.• Rate: Atrial and Ventricular < 60 Sinus Tachycardia - correct answer ✅Impulse also starts in SA Node• These rhythms follow all the criteria for NSR except for the rate.Rate: Atrial and Ventricular 100- Premature Atrial ComplexUnderlying rhythm must first be identified!Ex. SR with a PAC - correct answer ✅early P wave noted, which may appear slightly different than other P waves but PRI within normal limits.QRS within normal limits
Answers 2026(Verified Answers)
Nonconducted PAC - correct answer ✅Premature Atrial Complex in which their is a P wave but no QRS, this is called? Atrial Flutter - correct answer ✅The impulse originates in the Atria• The Atrial rate is 250-350 and rhythm regular• The PRI is not measurable (N/A) - Characteristic saw- tooth wave (called F waves) for atrial activity• The Ventricular rhythm may be regular or irregular• QRS within normal limits• If the Ventricular rate is < 100 it is controlled ____ _____; if the Ventricular rate is > 100 it is uncontrolled ____ ____. Atrial Fibrillation - correct answer ✅unable to measure [N/A] atrial rate• No discernable P waves - PRI & Atrial rhythm cannot be measured [N/A]• The Ventricular rhythm is irregular• QRS within normal limits• If the Ventricular rate is > 100 the rhythm is uncontrolled _____; if the Ventricular rate is < 100 the rhythm is controlled
Supraventricular Tachycardia - correct answer ✅Regular Ventricular rhythm & rate >
Answers 2026(Verified Answers)
within normal limitsP wave before every QRS PRI constant & > 0. 2nd Degree Heart Block Type I - correct answer ✅Rhythm: Atrial is regular; Ventricular is irregular• Rate: Atrial rate is greater than ventricular rate• P waves: Normal in size and shape, but not all followed by QRS• PRI: Lengthens• QRS: Usually within normal limits, but is periodically droppedProgressive PRI lengthening until dropped QRS Usually cyclic (pattern repeats) 2nd Degree Heart Block Type II - correct answer ✅Rhythm: Atrial regular and Ventricular regular or irregular• Rate: Atrial rate greater than Ventricular rate• P waves: Normal, but not all followed by QRS's• PRI: Constant (when present); usually WNL but may be prolonged• QRS: WNL or wide (depending on level of the block); Some droppedMore P's than QRS's : Dropped QRS's PRI constant when present 3rd Degree or Complete Heart Block Atrioventricular level - correct answer ✅Atrial Rate 60-100, Ventricular Rate
Answers 2026(Verified Answers)
40-60, Rhythm regular, P waves: normal but may be hidden,PRI: N/A,QRS: 0.04 to 0.10 seconds 3rd Degree or Complete Heart Block Bundle Branch Level - correct answer ✅Atrial Rate 60-100Ventricular Rate 20- 40Rhythm regularP waves: normal but may be hidden,PRI: N/AQRS: > 0. Idioventricular Rhythm - correct answer ✅• Usually LETHALRhythm: Ventricular is usually regular• Rate: Ventricular between 20-40• QRS: ≥ 0.12• Atrial rate, rhythm, and PRI: N/A Accelerated Idioventricular Rhythm - correct answer ✅• Usually LETHALRhythm: Ventricular is usually regular• Rate: Ventricular between 40-100• QRS: ≥ 0.12• Atrial rate, rhythm, and PRI: N/A Agonal - correct answer ✅Idioventricular rhythm but with ventricular rate less than 20.
Answers 2026(Verified Answers)
instead of contract.Atrial and Ventricular rate & rhythm, PRI, QRS all non- discernable [N/A] Atrial Pacing - correct answer ✅Rhythm: Atrial and Ventricular regular• Rate: Atrial and Ventricular same- Atrial measured from spike to spike• P waves: Pacer spike seen at beginning of atrial activity- P wave may or may not be seen (lead type dependent) • PRI: Usually WNL- Measured from pacer spike to beginning of QRS
- QRS: May be WNL or wide Ventricular Pacing - correct answer ✅Atrial rhythm, rate, and PRI are non- measurable (N/A)Rhythm: Ventricular regular• Rate: Ventricular within set pacer limits- Measured from pacer spike to pacer spike • QRS: Wide; Pacer spike seen before each QRS- Measured from pacer spike to end of QRS Atrial-Ventricular Pacing - correct answer ✅Rhythm: Atrial and Ventricular regular• Rate: Atrial and Ventricular same & within set limits• P waves: Pacer spike seen at beginning of atrial activity- P waves may or may not be seen (lead type
Answers 2026(Verified Answers)
dependent)• PRI: WNL - Measured from atrial spike to ventricular spike• QRS: Wide - Measured from ventricular spike to end of QRS Failure to Pace - correct answer ✅V-Pacer low limit set @ 60bpm; HR = 40bpmor V-Paced @ 70bpm but strip shows 60bpm are examples of? Failure to Capture - correct answer ✅Potentially LETHAL pacer spike not followed by the appropriate atrial or ventricular response. Failure to Sense (Undersensing) - correct answer ✅This is noted by spikes that are fired too close to patient's own intrinsic beats. Oversensing - correct answer ✅Occurs when the pacer senses or "sees" things other than true P waves or QRS complexesThis is noted by lack of pacer spikes when pacer firing should have occurred.Examples are
