At a glance
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The Effect of Two Different Rates of Nitroglycerin Infusion on Cerebral Rewarming During Rewarming Period of Hypothermic Cardiopulmonary Bypass
In Brief
A Phase 4 clinical trial evaluating Glyceryl trinitrate 0.2 and Glyceryl trinitrate 0.5 for Coronary Artery Bypass and Cardiopulmonary Bypass. Completed, enrolled 78 participants across 1 site.
Detailed Summary
Glyceryl trinitrate is used in coronary artery bypass grafting surgery. This surgery frequently employs hypothermic cardiopulmonary bypass, where the whole body is cooled down to 28-32 °C to arrest the heart, and protect the organs from ischemic insult. When the cardiac repair or grafting is done, the body is warmed to 37 °C. During this "rewarming period", the heart has to beat against the vessels, all of which are constricted due to hypothermia. To overcome this constriction of the vessels, and decrease the workload of the heart, glyceryl trinitrate is infused. This drug causes significant dilatation in arteries and veins, which allows the heart to pump the blood with less force. The dilatation of the vessels also allows the body to rewarm more easily. The investigators' concern is whether increased infusion rates of glyceryl trinitrate may cause uncontrolled rewarming of the brain or not. The investigators will measure the temperature of the brain using a temperature probe located in the nasal cavity. The temperature will be recorded at each minute during the the rewarming period. Results of two commonly used infusion rates of glyceryl trinitrate will be compared.
Study Details
Timeline
Interventions
These patients will receive glyceryl trinitrate infusion at a rate of 0.2 mcg/kg/min throughout the rewarming period of cardiopulmonary bypass, which usually lasts for 30-45 minutes.
These patients will receive glyceryl trinitrate infusion at a rate of 0.5 mcg/kg/min throughout the rewarming period of cardiopulmonary bypass, which usually lasts for 30-45 minutes.