Clamping of the carotid arteries above the carotid sinus results in
When clamping of carotid vessels above carotid sinus is done, there is an increased blood pressure on the baroreceptors. 
This will cause them to discharge more and results in fall of blood pressure and heart rate.
Increase in blood pressure and increase in heart rate
Increase in blood pressure and decrease in heart rate
Decrease in blood pressure and increase in heart rate
Decrease in blood pressure and decrease in heart rate