ECG: Electrical Activity of Heart — NEET Biology
📚 Practice ConceptYou are probably familiar with this scene from a typical hospital television show: A patient is hooked up to a monitoring machine that shows voltage traces on a screen and makes the sound "... pip... pip... pip..... pceeeeeeeeeeeeeeeeeeee" as the patient goes into cardiac arrest. This type of machine (electro-cardiograph) is used to obtain an electrocardiogram (ECG). ECG is a graphical representation of the electrical activity of the heart during a cardiac cycle. To obtain a standard ECG (as shown in the
Which of the following statements are correct regarding the clinical significance and interpretation of a standard Electrocardiogram (ECG)? S1: ECG is a graphical representation of the electrical activity of the heart during a cardiac cycle. S2: The P-wave represents the electrical excitation (depolarisation) of the atria, which leads to atrial contraction. S3: Any deviation from the standard ECG shape for a given lead configuration always indicates a severe cardiac arrest. S4: The QRS complex represents the repolarisation of the ventricles, marking the end of systole. S5: By counting the number of QRS complexes in a specific time period, one can accurately determine the heart beat rate of an individual.
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