Ecg Lab Report

Topics: Cardiology, Cardiac electrophysiology, Heart rate Pages: 5 (1674 words) Published: February 20, 2013
Human ECG

The purpose of these lab exercises is to understand the function and importance of an electrocardiogram. This lab will demonstrate how stress levels or different elevations can affect human heart rate. Furthermore, the equipment used in the experiment will show the functions in the right and left arm; as well as, in the right and left ankles. Finally, the lab will serve a purpose as a way to know how to read an electrocardiogram and calculate the heart rate. Introduction

An electrocardiogram can be used to record activity during the cardiac process of pumping and returning blood to the body and heart because of the electric current that spreads through the tissue of the heart and to the surface of the body. By using four electrodes, one on your left and right wrist and one on the upper left and right foot. From that information a person is able to record the electrical potentials produced by the heart.

Beginning of the lab involved a reading from the electrocardiogram and then calculating the heart rate by comparing the waves to what the electrocardiogram reading said. The electrocardiogram is divided into five main parts. The first small peak is the P wave; it represents atrial depolarization (Eric, 2011). Next is the QRS complex; the QRS consist of the Q, R and S. The complex will occur because of the electrical events produced as the ventricles depolarize (Eric, 2011). Lastly, there is the T wave; it represents the ventricular repolarization (Eric, 2011).

The voltages recorded on an electrocardiogram can be compared to on table 28.1 in the Ninth Edition Seeley’s laboratory manual. In the lab experiment there will be a comparison of the bpm, PR interval, QRS complex and the QT interval. All in which you have an average that you can see if you are in the “normal” range of. If someone has a bpm above a hundred; it is called Tachycardia (Eric, 2011). If someone has a bpm below sixty; it is called Bradycardia (Eric, 2011). Following bpm, you have the PR interval the normal for that range is 0.16-0.18 seconds (Eric, 2011). Continuing with the next one is QRS complex the normal for the complex is 0.08 seconds (Eric, 2011). In contrast, the QT interval normal is between 0.3-0.4 seconds (Eric, 2011). Each one of the test can express something different in relation to your heart rate.

Purpose of the lab was to teach someone how to read an electrocardiogram but as well to know how to calculate heart rate. If there was vibration of the table or the position in which someone was standing/laying then it can affect the reading of the electrocardiogram. Methods

The protocol for this lab experiment involved a few things. First off gather the machine that will be used to test the heart rate. Connect the MP30 unit to an electrical outlet with the power supply (Eric, 2011). Do not turn the MP30 quiet yet though. Plug in the SS2L lead cables, into the CBLSERA cable (Eric, 2011). From that point all jewelry should be taken off and the electrodes should be placed above your inner wrist on both left and right arm also one electrode above your ankle on the left and right foot. After putting the electrodes on, plug in the information that is asked: age and sex. Now connect the right arm lead to the right arm, the left arm lead to the left arm, the right ankle lead to the right ankle and the left ankle lead to the left leg. At that point have a partner make sure blood pressure is not to high, then press okay. The reading will take ten seconds. Stand straight up and look straight ahead. Try not to move while the test is being run. The electrocardiogram will then print a reading. From there calculate and compare the findings to table 28.1, page 376 in the labuartory manual.

In the lab experiment there was four things to find from the electrocardiogram. Before starting to calculate the test decide which lead you will be using: I or II. The first test being Beats per minute. The way to find the beats per...
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