Skip to Content
Default Alt Text for the banner

Holter & Event Loop Monitoring

How can this help?

A holter monitor is a portable electrocardiogram (EKG) that monitors the electrical activity of a patient's heart around the clock for one to two days. Doctors often use the monitor when an abnormal heart rhythm (arrhythmia) is suspected. We may also use it when the patient is experiencing chest pain. This may be a sign the heart is not getting enough oxygen-rich blood (cardiac ischemia).

A holter monitor can be used to:

  • Assess your heart rhythm (arrhythmia)
  • Diagnose poor blood flow to the heart muscle (cardiac ischemia)
  • Diagnose cause for chest pain
  • Diagnose abnormalities of your heart, such as heart chamber enlargement and abnormal electrical conduction
  • Cardiac practices amy use event loop monitors which are also portable, but may be worn for longer periods of time—up to several months. When you have a heart rhythm irregularity, like palpitations, information is sent to your doctor automatically from the device.

How it's done

Holter monitoring. A technician attaches several electrodes to your chest to monitor your heart's electrical activity. A small device worn on a belt or shoulder strap records the information. At the end of the testing period—typically one to two days—you return the monitor so the data recorded can be analyzed.

Event loop monitoring. This device is attached in much the same way as a holter monitor. When you feel symptoms of a heart problem, such as palpitations, you press a button on the monitor. Information on your heart's electrical activity is then sent to your doctor for analysis. This device can be removed for bathing. At the end of the testing period—typically one to four weeks—you return the monitor so the recorded data can be analyzed.

Technology and expertise at Lee Health

Lee Health offers the latest technology for remotely monitoring heart rhythm problems. Our electophysiology team is highly regarded in the treatment of heart rhythm disorders such as arrhythmia, bradycardia (slow heart beat), and tachycardia (fast heart beat).

Who to contact

For questions related to cardiovascular care or services, email us at