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The myocardial protective effect of dexmedetomidine in high-risk patients undergoing aortic vascular surgery
1Department of Anesthesia, Cairo University, Cairo, Egypt.
Insights
Dexmedetomidine is safe and effective for high-risk patients undergoing aortic vascular surgery, reducing heart rate and blood pressure changes. It also offers cardiac protection by decreasing myocardial ischemia, though it increases the risk of hypotension and bradycardia.
Area of Science:
- Anesthesiology
- Cardiology
- Vascular Surgery
Background:
- Aortic vascular surgery poses significant risks to patients, particularly those with pre-existing conditions.
- Myocardial ischemia is a major concern during and after such procedures.
- Effective perioperative management is crucial for improving outcomes.
Purpose of the Study:
- To evaluate the efficacy and safety of dexmedetomidine in high-risk patients undergoing aortic vascular surgery.
- To assess dexmedetomidine's impact on hemodynamic stability and cardiac protection.
- To identify potential side effects associated with dexmedetomidine use in this population.
Main Methods:
- A randomized prospective study involving 150 patients undergoing aortic vascular surgery.
- Patients were divided into two groups: one receiving dexmedetomidine and the other a placebo (normal saline).
- Hemodynamic parameters, serum troponin I levels, ECG, and echocardiography were monitored.
Main Results:
- Dexmedetomidine significantly reduced heart rate and minimized blood pressure fluctuations compared to the control group.
- The incidence of myocardial ischemia, indicated by troponin I levels and ECG changes, was lower in the dexmedetomidine group.
- While effective, dexmedetomidine was associated with a higher incidence of hypotension and bradycardia.
Conclusions:
- Dexmedetomidine demonstrates safety and efficacy in high-risk patients undergoing aortic vascular surgery.
- It effectively stabilizes hemodynamics and provides cardiac protection by reducing myocardial ischemia.
- Clinicians should be aware of and manage the increased risk of hypotension and bradycardia when using dexmedetomidine.
Objective:
The aim of the study was to assess the effect of dexmedetomidine in high-risk patients undergoing aortic vascular surgery.
Design:
A randomized prospective study.
Setting:
Cairo University, Egypt.
Materials And Methods:
The study included 150 patients undergoing aortic vascular surgery.
Intervention:
The patients were classified into two groups (n = 75). Group D: The patients received a loading dose of 1 μg/kg dexmedetomidine over 15 min before induction and maintained as an infusion of 0.3 μg/kg/h to the end of the procedure. Group C: The patients received an equal volume of normal saline. The medication was prepared by the nursing staff and given to anesthetist blindly.
Measurements:
The monitors included the heart rate, mean arterial blood pressure, central venous pressure, electrocardiogram (ECG), serum troponin I level, end-tidal sevoflurane, and total dose of morphine in addition transthoracic echocardiography to the postoperative in cases with elevated serum troponin I level.
Main Results:
The dexmedetomidine decreased heart rate and minimized the changes in blood pressure compared to control group (P < 0.05). Furthermore, it decreased the incidence of myocardial ischemia reflected by troponin I level, ECG changes, and the development of new regional wall motion abnormalities (P < 0.05). Dexmedetomidine decreased the requirement for nitroglycerin and norepinephrine compared to control group (P < 0.05). The incidence of hypotension and bradycardia was significantly higher with dexmedetomidine (P < 0.05).
Conclusion:
The dexmedetomidine is safe and effective in patients undergoing aortic vascular surgery. It decreases the changes in heart rate and blood pressure during the procedures. It provides cardiac protection in high-risk patients reflected by decreasing the incidence of myocardial ischemia and serum level of troponin. The main side effects of dexmedetomidine were hypotension and bradycardia.
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