Nitroglycerin belongs to the class of nitrate drugs, which can dilate the coronary blood vessels and increase the blood flow in the coronary arteries, because this drug also has a certain effect of dilating the veins, so it will lead to a decrease in the return blood flow resulting in a drop in blood pressure, so when applying nitroglycerin intravenous drip, the patient should adopt a lying position to avoid causing severe hypotension, while the intravenous drip rate should not be too fast, the amount of the drug is too large can cause severe Too much of this agent can cause severe headache, while too much may lead to tolerance. Since plastic infusion sets can adsorb nitroglycerin, non-adsorbent infusion devices should be used for intravenous infusion, and light avoidance measures should be taken during intravenous infusion. The drug is contraindicated in patients with coronary artery disease with severe hypotension and tachycardia, in patients with severe anemia, glaucoma, increased intracranial pressure, and in patients with hypersensitivity to this product.