The heart - more precisely its action by the electrical impulses that control its muscles.
A clue is in the root "card" - from Latin for the heart
PR (Pulse Rate) intervals are measured by using the gap between the beginning of the P wave (the excitation of the atria) and the beginning of the QRS , a typical deflection seen on an ECG (Electrocardiogram).
There are no waves in an electrocardiogram. An electrocardiogram (ECG) is performed by putting electrodes on the body and measuring heart activity directly.
The largest wave in an electrocardiogram is typically the R wave.
The P wave refers to the electrocardiographic representation of electrical activation of the atrial myocardium. It can be measured using an electrocardiogram.
Sodium chloride is not used during electrocardiogram.
Special training is required for interpretation of the electrocardiogram. To summarize in the simplest manner the features used in interpretations, the P wave of the electrocardiogram is associated with the contraction of the atria
the abbreviation for Electrocardiogram is either EKG or ECG
Electrocardiogram-- The pattern of the heart's electrical impulses that indicate the order and condition of the heart's components.
Electrocardiogram.
Electrocardiogram.
An electrocardiogram
An electrocardiogram (EKG) measures the electrical activity of the heart in the human body.