Diagnostic Highlights

Test

Normal Result

Abnormality with Condition

Explanation

12-Lead electrocardiogram (ECG)

Detects specific conduction defects and monitors the patient's cardiac response to electrolyte imbalances, drug effects, and toxicities

Regular sinus Junctional escape: Heart rate of rhythm 40-60 beats per minute with regular R to R interval; P wave may be inverted and precedes the QRS with a short PR interval

Premature junctional beats: Early beat disrupts rhythm; P wave may be inverted and precedes the QRS with a short PR interval.

Junctional tachycardia: Ventricular rate is 100-160 beats per minute and regular; P wave may be inverted and precedes the QRS with a short PR interval.

Other Tests: Pulse oximetry, ambulatory or Holter monitoring: To provide a 12- to 24-hour continuous recording of myocardial electrical activity as the patient performs normal daily activities.

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