Relias Dysrhythmia Basic A Exam (2025) | Complete Study Guide & EKG Cheat Sheet | Heart Block Mnemonics & Rationales

Ace the Relias Dysrhythmia Basic A Exam (2025) with this comprehensive, Graded A+ study resource. This guide provides a detailed breakdown of cardiac rhythms, essential EKG measurements, and the clinical criteria needed for accurate interpretation. Key Features Included: • Sinus Rhythms: Detailed criteria for Normal Sinus Rhythm (NSR), Sinus Bradycardia, and Sinus Tachycardia, including rate, P-wave, PR interval, and QRS duration. • Atrial & Junctional Rhythms: Mastery of Atrial Fibrillation (including RVR), Atrial Flutter, SVT, and Junctional Rhythms (Absent or Inverted P-waves). • Ventricular Dysrhythmias: Identification of PVCs (Unifocal, Bigeminy, Trigeminy), Ventricular Tachycardia, and Ventricular Fibrillation (Coarse vs. Fine). • Heart Block Mnemonics: Easy-to-remember "Husband and Wife" metaphors for identifying 1st Degree, 2nd Degree (Wenckebach & Mobitz II), and 3rd Degree (Complete) AV Blocks. • ECG Calculations: Clear instructions for calculating Regular Heart Rates (1500/boxes) and Irregular Heart Rates (6-second strip method). • Pacemaker Essentials: Definitions for Atrially, Ventricularly, and AV Paced rhythms, as well as troubleshooting Failure to Capture and Failure to Sense. • Clinical Measurements: Reference ranges for PR Intervals (0.12-0.20 sec), QRS Duration (0.12 sec), and QT Intervals (0.34-0.43). This document is essential for healthcare professionals and nursing students preparing for telemetry competency exams, focusing on the firing rates of the SA Node, AV Node, and Purkinje Fibers.