What is the rate on the rhythm strip in the image below?
90
110
73
50
The Correct Answer is A
A. To determine the heart rate from a rhythm strip, you can count the number of R-R intervals in a set time frame (typically 6 seconds) and multiply by 10 to convert to beats per minute. If the rhythm is regular, you can also use the 300 method by dividing 300 by the number of large squares between R waves. In this case, the rate is calculated to be 90 beats per minute.
B. A heart rate of 110 beats per minute would be classified as tachycardia and is not supported by the observed intervals.
C. A heart rate of 73 beats per minute would be a normal resting heart rate but does not match the calculation from the rhythm strip.
D. A heart rate of 50 beats per minute would indicate bradycardia, which is not reflected in this rhythm strip.
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Correct Answer is A
Explanation
A. Cranial nerve VII (facial nerve) is not primarily responsible for hearing; however, it does have some sensory function in the ear region. The primary cranial nerve responsible for hearing is cranial nerve VIII (vestibulocochlear), which is not listed among the options.
B. Cranial nerve X (vagus nerve) is primarily involved in autonomic functions and does not directly relate to hearing.
C. Cranial nerve I (olfactory nerve) is responsible for the sense of smell.
D. Cranial nerve II (optic nerve) is responsible for vision.
Correct Answer is A
Explanation
A. The bell of the stethoscope is best used to listen for low-pitched sounds, including some types of murmurs, and can help assess the quality and intensity of a cardiac murmur.
B. While palpation can provide some information about the heart's function (such as thrills), it is not the primary method for assessing the quality of a murmur.
C. A Doppler ultrasound device is used for measuring blood flow and can help in assessing murmurs but does not provide the quality assessment needed for characterizing a murmur.
D. Percussion is not typically used to evaluate murmurs; it is more useful for assessing the size and borders of organs.