Diagnosis

To diagnose your condition, your doctor will review your symptoms and your medical and family medical history and do a physical examination.

Your doctor will also order tests to measure your heart rate, establish a link between a slow heart rate and your symptoms, and identify conditions that might be causing bradycardia.

Electrocardiogram (ECG or EKG)

An electrocardiogram, also called an ECG or EKG, is a primary tool for evaluating bradycardia. Using small sensors (electrodes) attached to your chest and arms, it records electrical signals as they travel through your heart.

Because an ECG can't record bradycardia unless it happens during the test, your doctor might have you use a portable ECG device at home. These devices include:

  • Holter monitor. Carried in your pocket or worn on a belt or shoulder strap, this device records your heart's activity for 24 to 48 hours.

    Your doctor will likely ask you to keep a diary during the same 24 hours. You'll describe any symptoms you experience and record the time they occur.

  • Event recorder. This device monitors your heart activity over a few weeks. You push a button to activate it when you feel symptoms so that it records your heart's activity during that time.

Your doctor might use an ECG monitor while performing other tests to understand the impact of bradycardia. These tests include:

  • Tilt table test. This test helps your doctor better understand how your bradycardia contributes to fainting spells. You lie flat on a special table, and then the table is tilted as if you were standing up to see if the change in position causes you to faint.
  • Exercise test. Your doctor might monitor your heart rate while you walk on a treadmill or ride a stationary bike to see whether your heart rate increases appropriately in response to physical activity.

Laboratory and other tests

Your doctor will order blood tests to screen for conditions that might be contributing to bradycardia, such as an infection, hypothyroidism or an electrolyte imbalance.

If sleep apnea is suspected of contributing to bradycardia, you might undergo tests to monitor your sleep.

Aug. 23, 2017
References
  1. Homoud MK. Sinus bradycardia. http://www.uptodate.com/home. Accessed Dec. 28, 2016.
  2. Bradycardia — Slow heart rate. American Heart Association. http://www.heart.org/HEARTORG/Conditions/Arrhythmia/AboutArrhythmia/Bradycardia-Slow-Heart-Rate_UCM_302016_Article.jsp. Accessed Dec. 28, 2016.
  3. Arrhythmia. National Heart, Lung, and Blood Institute. http://www.nhlbi.nih.gov/health/health-topics/topics/arr/. Accessed Dec. 28, 2016.
  4. Slow heartbeat. Heart Rhythm Society. http://www.hrsonline.org/Patient-Resources/Heart-Diseases-Disorders/Sick-Sinus-Syndrome. Accessed Dec. 29, 2016.
  5. Heart block. National Heart, Lung, and Blood Institute. https://www.nhlbi.nih.gov/health/health-topics/topics/hb. Accessed Dec. 29, 2016.
  6. Hayes DL. Permanent cardiac pacing: An overview of devices and indications. http://www.uptodate.com/home. Accessed Dec. 28, 2016.
  7. Riggin EA. Allscripts EPSi. Mayo Clinic, Rochester, Minn. Jan. 3, 2016.