This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
Cushing's phenomenon is 
Select and explain. 
A. Low BP & high hea rate, B. High BP & high hea rate, C. Low BP & low hea rate, D. High BP & low hea rate
D: High BP & low hea rate
Answer: D: High BP & low hea rate 
Explanation: Cushing reflex tends to restore the blood flow to the medulla. Over a considerable range, the blood pressure rise is propoional to the increase in intracranial pressure. The rise in blood pressure causes a reflex decrease in hea rate the aerial baroreceptors. This is why bradycardia rather than tachycardia is characteristically seen in patients with increased intracranial pressure. Ref: Ganong&;s Review of medical physiology 25th edition. Page:593