OverviewAn electrocardiogram records the electrical signals in the heart. It's a common and painless test used to quickly detect heart problems and monitor the heart's health. Show
An electrocardiogram — also called ECG or EKG — is often done in a health care provider's office, a clinic or a hospital room. ECG machines are standard equipment in operating rooms and ambulances. Some personal devices, such as smartwatches, offer ECG monitoring. Ask your health care provider if this is an option for you. Types
Why it's doneAn electrocardiogram is a painless, noninvasive way to help diagnose many common heart problems. A health care provider might use an electrocardiogram to determine or detect:
You may need an ECG if you have any of the following signs and symptoms:
The American Heart Association doesn't recommend using electrocardiograms to assess adults at low risk who don't have symptoms. But if you have a family history of heart disease, your health care provider might suggest an electrocardiogram as a screening test, even if you have no symptoms. If symptoms tend to come and go, they may not be detected during a standard ECG recording. A health care provider might recommend remote or continuous ECG monitoring. There are several different types.
 A person receives an ECG while on a helicopter for medical transport. More Information
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email communications at any time by clicking on the unsubscribe link in the e-mail. RisksAn electrocardiogram is a safe procedure. There is no risk of electrical shock during the test because the electrodes used do not produce electricity. The electrodes only record the electrical activity of the heart. You may have minor discomfort, similar to removing a bandage, when the electrodes are removed. Some people develop a slight rash where the patches were placed. How you prepareNo special preparations are necessary for a standard electrocardiogram. Tell your health care provider about any medications and supplements you take. These can often affect the results of an ECG. What you can expectAn electrocardiogram can be done in a health care provider's office or hospital. BeforeYou may be asked to change into a hospital gown. If you have hair on the parts of your body where the electrodes will be placed, the care provider may shave the hair so that the patches stick. Once you're ready, you'll typically be asked to lie on an examining table or bed. DuringDuring an ECG, up to 12 sensors (electrodes) are attached to the chest and limbs. The electrodes are sticky patches with wires that connect to a monitor. They record the electrical signals that make the heart beat. A computer records the information and displays it as waves on a monitor or on paper. You can breathe during the test, but you will need to lie still. Make sure you're warm and ready to lie still. Moving, talking or shivering may interfere with the test results. A standard ECG takes a few minutes. AfterYou can typically return to your usual activities after your electrocardiogram. ResultsYour health care provider might discuss results with you the same day as your electrocardiogram or at your next appointment. ECG results can give a health care provider details about the following:
If results show a heart rhythm problem, you may need another ECG or other test, such as an echocardiogram. Treatment depends on what's causing your signs and symptoms. Clinical trialsExplore Mayo Clinic studies of tests and procedures to help prevent, detect, treat or manage conditions. What electrolyte imbalance causes ECG changes?Potassium. Potassium plays a key role in both depolarization and repolarization, which is why potassium imbalance may cause dramatic ECG changes.
How does electrolyte disturbance affect patient ECG?Electrolyte Abnormalities on ECG
Severe hypercalcemia and severe hypermagnesemia can induce heart block and possibly cardiac arrest, and hypomagnesemia has been associated with widening QRS or QT, peaked T waves, and premature ventricular contractions.
What electrolyte imbalance most often affects cardiac rhythm?Electrolyte Imbalances
According to the American Heart Association, potassium imbalances are the most common electrolyte-associated cardiac arrhythmias. Potassium plays a role in both nerve conduction and the heart's ability to send an electrical impulse.
Which electrolyte is important for heart rhythm?The two most important electrolytes are potassium and calcium. They are both vitally concerned with proper function of the cardiac muscle. Both electrolytes are needed in the proper amounts for contraction of the muscle and for the proper conduction of ht impulses through the special conduction pathway in the heart.
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Which patient would benefit from ecg monitoring due to an electrolyte imbalance?
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