Phlebotomy Essentials
6th Edition
ISBN:9781451194524
Author:Ruth McCall, Cathee M. Tankersley MT(ASCP)
Publisher:Ruth McCall, Cathee M. Tankersley MT(ASCP)
Chapter1: Phlebotomy: Past And Present And The Healthcare Setting
Section: Chapter Questions
Problem 1SRQ
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Question
How long does a 12 lead ECG take?
Expert Solution

Step 1
ECG:
An electrocardiograph(ECG) is nothing but a voltmeter that records the changes in the electrical activity of the heart that occurs in between a positive and negative electrode.
Electrocardiography is the process by which these electrical changes are recorded.
The PQRST waves of an ECG:
- The P wave is an indication of atrial depolarization.
- QRS is for ventricular depolarization.
- T wave is for ventricular repolarization.
- The PR interval usually records the atrial depolarization along with a delay in the AV junction.
- The QT interval is used for indicating repolarisation and depolarization of ventricles.
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