thumb|Use of monitoring (medicine)|real time monitoring of the heart in an [[intensive care unit in a German hospital (2015), the monitoring screen above the patient displaying an electrocardiogram and various values of parameters of the heart like heart rate and blood pressure]]
Electrocardiography is a medical technique that records the electrical activity of the heart to create a visual display called an electrocardiogram. It's important because it allows doctors to monitor vital heart information like heart rate and identify potential heart problems in real time, especially in critical care settings.
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thumb|Use of monitoring (medicine)|real time monitoring of the heart in an [[intensive care unit in a German hospital (2015), the monitoring screen above the patient displaying an electrocardiogram and various values of parameters of the heart like heart rate and blood pressure]]
Electrocardiography is the process of using an electrocardiograph (a device) to produce an electrocardiogram (a recording, often called an ECG or EKG) that shows a line graph of the heart's electrical activity through repeated cardiac cycles. It is an electrogram of the heart which is a graph of voltage versus time of the electrical activity of the heart using electrodes placed on the skin. These electrodes detect the small electrical changes that are a consequence of cardiac muscle depolarization followed by repolarization during each cardiac cycle (heartbeat). Changes in the normal ECG pattern occur in numerous cardiac abnormalities, including: Cardiac rhythm disturbances, such as atrial fibrillation and ventricular tachycardia; Inadequate coronary artery blood flow, such as myocardial ischemia and myocardial infarction; and electrolyte disturbances, such as hypokalemia.
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