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Using the rule of 300, what is the approximate rate

Using the rule of 300, what is the approximate rate

Phlebotomy Essentials
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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Using the rule of 300, what is the approximate rate?

This image displays an electrocardiogram (ECG) trace, specifically lead II. The ECG graph is plotted on grid paper where time is shown on the horizontal axis and electrical activity (voltage) on the vertical axis. **Graph Analysis:** 1. **Grid Layout:** - The graph paper consists of small squares. Each small square is 1 mm by 1 mm, representing 0.04 seconds (40 ms) on the horizontal axis and 0.1 millivolts (mV) on the vertical axis. 2. **Waveform Components:** - **P Wave:** The initial small upward deflection, indicative of atrial depolarization. - **QRS Complex:** The subsequent sharp upward and downward deflection, representing ventricular depolarization. It is usually larger than the P wave. - **T Wave:** The later smooth, rounded wave reflecting ventricular repolarization. 3. **Heart Rhythms:** - The waves appear at regular intervals, suggesting a regular heart rhythm. Each QRS complex is followed by a T wave, which is typical. This ECG strip would be used to assess the heart's rhythm and electrical activity and could indicate normal sinus rhythm.
Transcribed Image Text:This image displays an electrocardiogram (ECG) trace, specifically lead II. The ECG graph is plotted on grid paper where time is shown on the horizontal axis and electrical activity (voltage) on the vertical axis. **Graph Analysis:** 1. **Grid Layout:** - The graph paper consists of small squares. Each small square is 1 mm by 1 mm, representing 0.04 seconds (40 ms) on the horizontal axis and 0.1 millivolts (mV) on the vertical axis. 2. **Waveform Components:** - **P Wave:** The initial small upward deflection, indicative of atrial depolarization. - **QRS Complex:** The subsequent sharp upward and downward deflection, representing ventricular depolarization. It is usually larger than the P wave. - **T Wave:** The later smooth, rounded wave reflecting ventricular repolarization. 3. **Heart Rhythms:** - The waves appear at regular intervals, suggesting a regular heart rhythm. Each QRS complex is followed by a T wave, which is typical. This ECG strip would be used to assess the heart's rhythm and electrical activity and could indicate normal sinus rhythm.
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