kris2c
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During surgical removal of an invasive glioma from the skull base, cranial nerves IX and X are accidentally cut bilaterally. What would be the immediate change in the patient's hemodynamic condition?
A. Bradycardia with hypertension
B. Bradycardia with hypotension
C. Sinus arrhythmia with hypotension
D. Tachycardia with hypertension
E. Tachycardia with hypotension
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Kris2c
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| peekay
Forum Guru
Topics: 102
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D- TACHCRDIA WITH HTN.DUE OT UNINHIBITED SYMPATHETIC OUTFLOW
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tachycardia + hypotension
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| auubar
Forum Senior
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yeah tachycardia with hypertension
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| kris2c
Forum Senior
Topics: 30
Posts: 108
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The correct answer is D.
The glossopharyngeal nerve (CN IX) and the vagus nerve (CN X) carry afferent information to the medulla from the carotid sinus and aortic arch baroreceptors, respectively.
The firing rate of these neurons increases with increasing blood pressure. Therefore, severing these nerves sends the medulla a false signal that the patient has suddenly lost all blood pressure. This elicits a baroreceptor reflex, resulting in an increase in sympathetic outflow and leading to tachycardia and hypertension.
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Kris2c
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