Heart, Blood and Circulation

Anatomy of the Heart

At an average rate of 80 times a minute, the heart beats about 115,000 times in one day or 42 million times in a year. During an average lifetime, the human heart will beat more than 3 billion times. Read the Complete Overview ›

Pacemakers FAQs

Do cellular phones interfere with pacemakers or ICDs?
The answer to this question depends on the type of cellular phone being used. Today's pacemakers and ICDs are engineered to withstand interference from analog cellular phones. However, in some cases, digital cellular phones may interfere with the devices. According to the American Heart Association, a group of cellular phone companies is studying the newer cellular phones with new frequencies and their effect on pacemakers. The general recommendation is to avoid placing a cell phone directly over the implanted device and hold the cell phone to the ear opposite to the side of the device.

Pacemaker and ICD FAQ

What is an Electrocardiogram (EKG)?

(ECG, EKG, Resting ECG, Resting EKG)

An electrocardiogram (ECG or EKG) is one of the simplest and fastest procedures used to evaluate the heart. Electrodes (small, plastic patches) are placed at certain locations on the chest, arms, and legs. When the electrodes are connected to an ECG machine by lead wires, the electrical activity of the heart is measured, interpreted, and printed out for the physician's information and further interpretation.

Other related procedures that may be used to assess the heart include exercise electrocardiogram (ECG), Holter monitor, signal-averaged ECG, cardiac catheterization, chest x-ray, computed tomography (CT scan) of the chest, echocardiography, electrophysiological studies, magnetic resonance imaging (MRI) of the heart, myocardial perfusion scans, radionuclide angiography, and ultrafast CT scan. Please see these procedures for additional information.

What Electrocardiogram Tests Measure

Prepare for Your Appointment

With just 13 minutes on average to meet with your doctor, pre-visit planning is important to your overall care experience. Follow the ABCs for appointments: Arrive early. Be prepared. Communicate. Your doctor appreciates with active role you are taking in your health. Search HealthGrades for Top Rated Local Cardiologists ›

Heart, Blood and Circulation Symptom Guides

The diagnoses provided in the Raynaud's Decision Guide area among the most common that could explain your symptoms, but, the list is not exhaustive and there are many other possibilities. Most people with Raynaud's (up to 90 percent or more) are otherwise healthy and have no other medical conditions. However, certain associate conditions, on the other hand, are rather rare, and include lupus, scleroderma and CREST syndrome, among others. Begin Your Evaluation for Raynaud's ›