Tudo sobre Potencial de ação

Tudo sobre Potencial de ação

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Use electrodes of the same brand. Using different brands with dissimilar composition can hinder an accurate ECG trace.

In a conventional 12-lead ECG, ten electrodes are placed on the patient's limbs and on the surface of the chest. The overall magnitude of the heart's electrical potential is then measured from twelve different angles ("leads") and is recorded over a period of time (usually ten seconds).

The study of the conduction system of the heart is called cardiac electrophysiology (EP). An EP study is performed via a right-sided cardiac catheterization: a wire with an electrode at its tip is inserted into the right heart chambers from a peripheral vein, and placed in various positions in close proximity to the conduction system so that the electrical activity of that system can be recorded.[citation needed] Interpretation[edit]

Each of the 12 ECG leads records the electrical activity of the heart from a different angle, and therefore align with different anatomical areas of the heart. Two leads that look at neighboring anatomical areas are said to be contiguous.[citation needed] Category Leads Activity

For example, depolarizing from right to left would produce a positive deflection in lead I because the two vectors point in the same direction.

All of the waves on an ECG tracing and the intervals between them have a predictable time duration, a range of acceptable amplitudes (voltages), and a typical morphology. Any deviation from the normal tracing is potentially pathological and therefore of clinical significance.[citation needed]

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While it is a relatively simple test to perform, the interpretation of the ECG tracing requires significant amounts of training. Numerous textbooks are devoted to the subject.

The right side of the heart collects blood from the body and pumps it to the lungs while the left side of the heart receives blood from the lungs and pumps it to the body.

The results of the study are described by a specialist who compares these norms with the results obtained. In the interpretation, the doctor of functional diagnostics indicates the revealed deviations, according to which the attending physician of the patient makes a diagnosis.

The patient unbuttons or removes clothing for convenient attachment of electrodes in the points required for the study and lies on the couch.

The electrocardiogram mais informações can measure the rate and rhythm of the heartbeat, as well as provide indirect evidence of blood flow to the heart muscle.

The electrocardiogram is one of the simplest and basic cardiac investigations available. It can provide a wealth of useful information, and remains an essential part of the assessment of patients.

Lead augmented vector right (aVR) has the positive electrode on the right arm. The negative pole is a combination of the left arm electrode and the left leg electrode:

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