Rhythm: Regular atrial and ventricular rhythms

• Rate: Atrial rates are 75 beats/min; ventricular rates are 36 beats/min
• P wave: Normal size; no constant relationship to QRS complex
• PR interval: N/A
• QRS complex: 0.16 second; wide and bizarre
• T wave: Normal except for second beat distorted by a P wave
• QT interval: 0.42 second
• Interpretation: Third-degree AV block