In the conduction system of the heart, which of the following components is stimulated after the sinoatrial node?
Left bundle branch
Purkinje fibers
Right bundle branch
Atrioventricular node
The Correct Answer is D
A. Left bundle branch: The left bundle branch is stimulated after the atrioventricular node and bundle of His, not immediately after the sinoatrial node.
B. Purkinje fibers: The Purkinje fibers are stimulated later in the conduction pathway, after the bundle branches.
C. Right bundle branch: The right bundle branch is also stimulated after the atrioventricular node and bundle of His.
D. Atrioventricular node: After the sinoatrial node initiates the heartbeat, the electrical impulse travels to the atrioventricular node, which then passes the signal to the bundle of His and down to the bundle branches.
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Correct Answer is D
Explanation
A. Begin audiometer testing on the highest frequency and lower gradually: Audiometer testing should begin at lower frequencies and gradually increase to ensure a thorough evaluation of hearing.
B. Begin audiometer testing using both ears: Audiometer testing is usually done one ear at a time to accurately assess hearing in each ear.
C. Use the Ishihara test to measure the patient's field of vision: The Ishihara test is used for color vision testing, not for measuring the field of vision.
D. Document any squinting during the Snellen test: Squinting during the Snellen test can indicate vision problems and should be documented as it may affect the accuracy of the vision assessment.
Correct Answer is A
Explanation
A. Deflate the cuff slowly until the last sound is heard. The diastolic reading is determined when the last sound (Korotkoff sound) is heard as the cuff is deflated.
B. Listen for the first sound through the stethoscope: The first sound corresponds to the systolic reading, not the diastolic.
C. Document the reading when the gauge needle jumps: The gauge needle jump is not a reliable indicator of blood pressure readings.
D. Inflate the cuff to at least 180 mm Hg, deflate the cuff slowly, and listen for the first sound: Inflating to 180 mm Hg is unnecessary and might cause discomfort; also, the first sound is the systolic reading, not the diastolic.