An electrocardiogram (EKG / ECG) is a test that checks for problems with the electrical activity of your heart. It can shows the heart’s electrical activity as line tracing on paper.
- Abnormal heart rhythms like heart rate is very fast, very slow, or irregular (irregularly irregular/ regularly irregular).
- Myocardial infarction; to detect actual condition of heart muscles.
- Enlarged heart; this causes bigger impulse than normal range.
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An electrocardiograph is a machine that is used to perform electrocardiography, and produces the electrocardiogram. The first electrocardiographs are discussed above and are electrically primitive compared to today's machines. The fundamental component to electrocardiograph is the Instrumentation amplifier, which is responsible for taking the voltage difference between leads (see below) and amplifying the signal. ECG voltages measured across the body are on the order of hundreds of microvolts up to 1 millivolt (the small square on a standard ECG is 100 microvolts). This low voltage necessitates a low noise circuit and instrumentation amplifiers are key.
The standard 12-lead electrocardiogram is a representation of the heart's electrical activity recorded from electrodes on the body surface. This section describes the basic components of the ECG and the lead system used to record the ECG tracings. Topics for study: ECG Waves and Intervals.
Heart rate of a normal adult patient at rest is between 60 and 100 beats/min. A heart rate slower than 60 beats/min is called bradycardia; a heart rate faster than 100 beats/min is called tachycardia. To determine the heart rate from a recording made by modern ECG machines is relatively simple.
An electrocardiogram (EKG or ECG) is a test that checks for problems with the electrical activity of your heart. An EKG shows the heart's electrical activity as line tracings on paper. The spikes and dips in the tracings are called waves. The heart is a muscular pump made up of four chambers.
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