Advanced Dysrhythmias || with 100% Error-free Answers.

P wave: PR interval: QRS complex: (ST segment) T wave: QT interval: correct answers • P wave - atrial depolarization and contraction • PR interval - time of travel from the SA node to AV node (.12-.2) • QRS - ventricular depolarization and contraction (.08-.12) - Note: Atrial repolarization occurs during this time, but cannot be seen on EKG • T wave - ventricular repolarization • QT interval - start of ventricular contraction to end of relaxation Systematic Approach to analyzing EKG (7 steps) correct answers 1. Determine atrial & ventricular rate and rhythm. 2. Identify P waves and shape, and if there are P waves for every QRS. 3. Determine PR interval (0.12-.2), and if consistent, irregular but with pattern to irregularity, or just irregular. 4. Determine QRS duration, consistency, and shape. (0.12) 5. Identify T wave and shape. 6. Identify ST segment, and any elevation/depression. 7. Identify any ectopic beats occurring outside underlying rhythm. Determining HR from EKG strip correct answers Typical heart rhythm strips will contain 6 seconds (30 big boxes) • Rates in a 6 second strip can be obtained by - Ventricular rate = QRS (QRS to QRS-the gaps) x 10 - Atrial rate = P waves x 10 OR Ventricular rate = 1500 / # of small boxes between 2 QRS; Atrial rate = 1500 / # of small boxes between 2 P waves • 1 small box = .04sec, 5 boxes/large box = 0.2sec; 5 large boxes = 1 second, 15 large = 3sec To improve lead conduction... (4) correct answers - Clean and dry skin with soap and water - Remove excess hair - Gentle abrasion of skin with clean gauze to expose epidermis (dry gauze, not alcohol which acts as barrier, skin is a natural conductor) - Have patient remain still and supine Normal Sinus Rhythm correct answers • Ventricular and atrial rate: 60 to 100 bpm • Ventricular and atrial rhythm: Regular • QRS shape and duration: Usually normal, but may be regularly abnormal • P wave: Normal and consistent shape; always in front of the QRS • PR interval: Consistent interval between 0.12 and 0.20 seconds • P:QRS ratio: 1:1