What should be monitored after administering glucagon?

After administering glucagon, it is essential to monitor blood glucose levels, heart rate, and blood pressure. Glucagon is often used to treat severe hypoglycemia by promoting the release of glucose from the liver. Consequently, monitoring the blood glucose level is crucial to ensure that it rises to a safe level and to evaluate the effectiveness of the treatment.

Additionally, glucagon can impact cardiovascular function. Therefore, it is important to monitor the heart rate because changes can indicate the patient's response to the medication or the presence of stress on the cardiovascular system due to low glucose levels.

Blood pressure should also be observed, as fluctuations can occur following the administration of glucagon. Ensuring stable vital signs and glucose levels post-administration is critical for patient safety and effective management of their condition.

Considering all of these aspects, monitoring blood glucose levels, heart rate, and blood pressure is imperative, making the correct answer encompass all these vital signs.