A patient with ruptured spleen is taken for laparotomy. His blood pressure is 80/50 and heart rate is 125/min. Induction agent of choice for this patient is:
**Core Concept**
In a patient with ruptured spleen and hypotension, the goal of anesthesia induction is to maintain or increase blood pressure to ensure adequate perfusion of vital organs. This is achieved by selecting an induction agent that has minimal vasodilatory effects and can help maintain vascular tone.
**Why the Correct Answer is Right**
Labetalol is the correct answer because it is a mixed alpha and beta-blocker that can help counteract the sympathetic surge caused by hemorrhage, thereby reducing peripheral vasodilation and maintaining blood pressure. Additionally, labetalol has a rapid onset of action, making it suitable for emergency situations. The alpha-blocking effect of labetalol can help reduce the severity of hypotension, while the beta-blocking effect can reduce the heart rate, thereby decreasing myocardial oxygen demand.
**Why Each Wrong Option is Incorrect**
**Option A:** Fentanyl is an opioid analgesic that can cause vasodilation and hypotension, making it a poor choice for this patient.
**Option B:** Propofol can cause significant hypotension due to its vasodilatory effects, which can worsen the patient's condition.
**Option C:** Ketamine can increase heart rate and blood pressure due to its sympathomimetic effects, but it can also cause vasodilation, which may not be ideal in this scenario.
**Clinical Pearl / High-Yield Fact**
Always remember that in a patient with hypotension, the induction agent of choice should be one that maintains or increases blood pressure, such as labetalol or phenylephrine, rather than one that can cause further vasodilation.
**Correct Answer: A. Labetalol**