Midazolam sedation for upper gastrointestinal endoscopy: comparison between the states of patients in partial and
Tatsuaki Ishiguro1, Chizuru Ishiguro, Goichi Ishiguro
1Department of Surgical Oncology, University of Tokyo, Ishiguro Geka Hospital, Fukagawa City, Hokkaido, Japan.
Background/Aims:
The amnesia produced by anesthesia is advantageous for unpleasant procedures like gastroscopy, and midazolam is one of the most commonly used anesthesias for endoscopy. However the proper use of midazolam from the viewpoint of complete amnesia has been discussed very little.
Methodology:
One hundred and thirty-three unselected patients about to undergo upper gastrointestinal endoscopy were premedicated with sufficient intravenous midazolam to cause enough sedation so that no response was evoked when calling their name. Pulse, arterial pressure, arterial oxygen saturation and the physical signs of patients were recorded continuously during the procedures. After the study, patients were given 0.25 mg of flumazenil and asked if they could recall the procedures. Those who could recall even part of the procedure were not regarded as achieving complete amnesia. The efficacy of the sedative was judged by the appearance of complete amnesia.
Results:
From our regression analysis complete amnesia was achieved in 75.9% of the total patients. The differences of the blood pressure fall, pulse rate increase and arterial oxygen saturation fall between the patients with complete and partial amnesia were minute and did not cause serious complications. Regression analysis revealed the most important factors for the complete amnesia to be midazolam dose per body weight and habitual hypnotic use.
Conclusions:
There are no obvious disadvantages to producing complete amnesia with midazolam for upper gastrointestinal endoscopy. Habitual hypnotic use along with midazolam dose per body weight is the most influencing factor for that purpose.
Insights
Achieving complete amnesia during endoscopy with midazolam is feasible in most patients. Key factors influencing amnesia include midazolam dosage and prior hypnotic medication use.
Area of Science:
- Anesthesiology
- Gastroenterology
Background:
- Midazolam is a common anesthetic for endoscopic procedures.
- Complete amnesia is desirable for patient comfort during endoscopy.
- Optimal midazolam dosing for complete amnesia requires further investigation.
Purpose of the Study:
- To evaluate the efficacy of midazolam for achieving complete amnesia during upper gastrointestinal endoscopy.
- To identify factors influencing the achievement of complete amnesia.
Main Methods:
- 133 patients undergoing endoscopy received intravenous midazolam.
- Sedation efficacy was assessed by patient recall after flumazenil administration.
- Physiological parameters (pulse, blood pressure, oxygen saturation) were monitored.
Main Results:
- Complete amnesia was achieved in 75.9% of patients.
- Minor physiological changes observed did not lead to serious complications.
- Midazolam dose per body weight and habitual hypnotic use were significant factors for amnesia.
Conclusions:
- Midazolam can effectively produce complete amnesia for upper gastrointestinal endoscopy without significant adverse effects.
- Patient's midazolam dose and history of hypnotic use are crucial for achieving amnesia.
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