8.2 observe fig 6 to understand how to read an ecg graph and answer the following question: (a) the ecg graph in fig 7 represents the rhythmic contraction and relaxation of the heart in a minute calculate the heart rate of the patient (b) do you think the patient has normal heart rate ?
Answers
Answer:
Besides the stethoscope, the electrocardiogram (ECG) is the oldest and most enduring tool of the cardiologist. A basic knowledge of the ECG will enhance the understanding of cardiology (not to mention this book
Whether during routine examinations or heart diagnostics, many people have already had an electrocardiogram (ECG or EKG). But what does it actually measure, and what does the ECG curve show us?
Our nerve and muscle cells communicate with each other using electrical and chemical signals. Regular electrical signals also control our heartbeat. These signals are sent by a group of cells in the right atrium of the heart known as the sinoatrial node (SA node), and they spread through the heart muscle tissue as tiny electrical impulses. This causes first the atria and then the ventricles of the heart to contract. The way that these signals spread through the heart can also be measured on the surface of our skin. An ECG measures these changes in electrical signals (or, in fact, voltage) on different areas of skin and plots them as a graph. The resulting ECG graph is called an electrocardiogram.
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