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Questions and Answers
What is the instrument that records the electrical activity of the heart?
What is the name of the record of the electrical activity of the heart?
What is the name of the node that acts as a pacemaker of the heart?
Where is V1 electrode placed?
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Where is V4 electrode placed?
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What ECG finding is associated with myocardial infarction (MI)?
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Study Notes
Principles of Electrocardiograph
- The electrocardiograph records the electrical activity of the heart.
- The resulting trace is called an electrocardiogram (ECG).
Electrophysiology
- The sinoatrial (SA) node serves as the heart's natural pacemaker.
- Electrical impulses spread across the atria, prompting atrial contraction.
- The impulse reaches the atrioventricular (AV) node for further transmission.
- The impulse travels along the interventricular septum through the Bundle of His.
- The Bundle of His splits into right and left bundle branches.
- Purkinje fibers distribute the impulse throughout the ventricular myocardium.
Electrode Placement
- V1: Positioned at the 4th intercostal space at the right sternal edge.
- V2: Located at the 4th intercostal space at the left sternal edge.
- V3: Placed midway between V2 and V4.
- V4: Positioned over the apex (5th intercostal space at the mid-clavicular line).
- V5: At the same horizontal level as V4, on the anterior axillary line.
- V6: At the same horizontal level as V4 and V5, positioned on the mid-axillary line.
Clinical Significance
- An ECG can reveal ST elevation indicative of a myocardial infarction (MI).
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Description
This quiz covers the basics of electrocardiography, including the electrical activity of the heart, the sinoatrial node, and the transmission of electrical impulses across the heart.
