Basic Dysrhythmia Assessment A, Relias Dysrhythmia, Advanced Cardiac Dysrhythmias EXAM 2025 AND PRACTICE QUESTIONS |ACCURATE ANSWERS| VERIFIED FOR GUARANTEED PASS |GRADED A |NEW VERSION

1. Second-Degree AV Block Type I (Wenckebach) Which ECG finding is characteristic of Second-Degree AV Block Type I? A. PR interval 0.20 and constant B. Progressive PR interval lengthening until a QRS is dropped C. No relationship between P waves and QRS D. Constant PR interval with sudden dropped QRS Correct Answer: B Rationale: Wenckebach shows progressively lengthening PR intervals until one P wave is not followed by a QRS complex. 2. Paced Rhythm Which ECG feature indicates a ventricular paced rhythm? A. Sawtooth P waves B. Irregularly irregular rhythm C. Pacemaker spike before wide QRS D. Absent P waves with narrow QRS Correct Answer: C Rationale: A ventricular pacemaker produces a pacing spike before a wide QRS complex. 3. Atrial Flutter Which ECG finding is seen in atrial flutter? A. Chaotic baseline with no P waves B. Sawtooth flutter waves C. Wide QRS rhythm at 30 bpm D. Progressive PR prolongation Correct Answer: B Rationale: Atrial flutter produces characteristic sawtooth flutter waves with atrial rates 250–350 bpm. 4. Atrial Fibrillation with Rapid Ventricular Response (RVR) Which finding is expected in atrial fibrillation with RVR? A. Regular rhythm with visible P waves B. Irregularly irregular rhythm with rate 100 bpm C. Wide QRS rhythm at 40 bpm D. ST elevation Correct Answer: B Rationale: A-fib with RVR is irregularly irregular and has a ventricular rate greater than 100 bpm. 5. Sinus Bradycardia Which ECG finding indicates sinus bradycardia? A. Rate 60 bpm with normal P waves B. Rate 100 bpm C. Absent P waves D. Wide QRS rhythm Correct Answer: A Rationale: Sinus bradycardia has a rate below 60 bpm with normal P waves before each QRS. 6. Normal Sinus Rhythm Which finding confirms normal sinus rhythm? A. Rate 60–100 bpm, P before each QRS B. PR 0.20 C. Irregularly irregular rhythm D. No P waves Correct Answer: A Rationale: Normal sinus rhythm requires regular rate (60–100), P before each QRS, normal PR. 7. Asystole Which ECG rhythm requires immediate CPR and epinephrine? A. Ventricular tachycardia with pulse B. Atrial flutter C. Asystole D. Sinus tachycardia Correct Answer: C Rationale: Asystole is a flatline with no electrical activity and requires CPR and epinephrine. 8. Third-Degree Heart Block Which ECG finding indicates third-degree heart block? A. PR progressively lengthens B. Constant PR with dropped beats C. No relationship between P waves and QRS complexes D. Sawtooth waves Correct Answer: C Rationale: Third-degree block has complete AV dissociation; atria and ventricles beat independently. 9. Junctional Rhythm Which ECG finding is characteristic of a junctional rhythm? A. P waves inverted or absent, rate 40–60 bpm B. Wide QRS 0.12 C. Irregularly irregular rhythm D. Rate 150 bpm Correct Answer: A Rationale: Junctional rhythm originates in AV node; P waves may be absent or inverted. 10. Coarse Ventricular Fibrillation What is the priority intervention for coarse ventricular fibrillation? A. Adenosine B. Magnesium C. Defibrillation D. Atropine Correct Answer: C Rationale: Ventricular fibrillation is a shockable rhythm requiring immediate defibrillation. 11. Sinus Rhythm with PVCs Which finding indicates PVCs? A. Early wide, bizarre QRS without P wave B. Progressive PR prolongation C. Sawtooth pattern D. Flatline Correct Answer: A Rationale: PVCs are premature, wide QRS complexes without preceding P waves. 12. Supraventricular Tachycardia (SVT) Which rhythm is most consistent with SVT? A. Rate 150–250 bpm, narrow QRS, regular B. Wide QRS, chaotic C. Irregular with no P waves D. Rate 40 bpm Correct Answer: A Rationale: SVT is rapid, regular, narrow-complex tachycardia. 13. Ventricular Tachycardia Which finding describes ventricular tachycardia? A. Irregularly irregular rhythm B. Wide QRS tachycardia without P waves C. Sawtooth waves D. Rate 60 Correct Answer: B Rationale: V-tach is a wide complex tachycardia and may lead to cardiac arrest. 14. Ventricular Bigeminy Ventricular bigeminy is best described as: A. Every other beat is a PVC B. Two PVCs in a row C. Irregular rhythm D. Dropped QRS Correct Answer: A Rationale: Bigeminy means a normal beat alternates with a PVC. 15. Second-Degree AV Block Type II Which finding indicates second-degree AV block type II? A. PR progressively longer B. Constant PR with sudden dropped QRS C. No P waves D. Irregularly irregular Correct Answer: B Rationale: Type II has fixed PR intervals with intermittent dropped QRS complexes. 16. Torsades de Pointes Torsades de pointes is treated with: A. Epinephrine B. Magnesium sulfate C. Adenosine D. Atropine Correct Answer: B Rationale: Torsades is polymorphic V-tach often due to prolonged QT and treated with magnesium. 17. Idioventricular Rhythm Which finding is consistent with idioventricular rhythm? A. Rate 20–40 bpm, wide QRS B. Rate 150 bpm C. Sawtooth waves D. PR 0.20 Correct Answer: A Rationale: Idioventricular rhythm is a slow ventricular escape rhythm.