Related Experiment Video
Updated: Jul 31, 2026

Collecting And Measuring Wound Exudate Biochemical Mediators In Surgical Wounds
Published on: October 20, 2012
The effectiveness of clonidine as an analgesic in paediatric adenotonsillectomy
E J Reimer1, G S Dunn, C J Montgomery
1Department of Anaesthesia, University of British Columbia, Vancouver, Canada. elreimer@interchange.ubc.ca
Insights
Preoperative oral clonidine effectively manages pain and provides sedation in children undergoing tonsillectomy. This study found clonidine comparable to intravenous fentanyl for pediatric pain relief after surgery.
Area of Science:
- Pediatric Anesthesiology
- Pain Management
- Pharmacology
Background:
- Tonsillectomy and adenotonsillectomy are common pediatric surgical procedures.
- Effective pain management and sedation are crucial for pediatric surgical recovery.
Purpose of the Study:
- To compare the analgesic efficacy of preoperative oral clonidine versus intraoperative intravenous fentanyl in children undergoing tonsillectomy or adenotonsillectomy.
Main Methods:
- A randomized, double-blind study involving 36 children (age 7-12) compared oral clonidine (4 mcg/kg) given preoperatively to intravenous fentanyl (3 mcg/kg) given intraoperatively.
- Pain scores (VAS), sedation, anxiety, and hemodynamic changes were monitored postoperatively.
Main Results:
- Clonidine resulted in higher preoperative sedation rates (63%) compared to fentanyl (6%).
- Visual analog scale (VAS) pain scores were similar between groups throughout the observation period.
- No significant differences were observed in the need for rescue analgesics (morphine, codeine) or the incidence of side effects.
Conclusions:
- Preoperative oral clonidine is an effective analgesic and sedative agent for pediatric tonsillectomy and adenotonsillectomy.
- Clonidine offers a viable alternative to intraoperative fentanyl for pain management in this patient population.
Purpose:
To compare the analgesic effects of preoperative oral clonidine with intraoperative intravenous fentanyl in children undergoing tonsillectomy or adenotonsillectomy.
Methods:
This randomized, controlled, double-blind study of 36 ASA I-II children, age 7-12 yr undergoing adenotonsillectomy was conducted at a tertiary care paediatric teaching hospital. Either 4 micrograms.kg-1 clonidine po was given 60-90 min preoperatively or 3 micrograms.kg-1 fentanyl i.v. was given intraoperatively. Postoperatively visual analog pain scores (VAS) were recorded at rest and on swallowing every 10 min for the first 30 min and then every 15 min for two hours. Morphine 0.05 mg.kg-1 i.v. was given for VAS > or = 5. If > 3 doses were required, 1.5 mg.kg-1 codeine po and 20 mg.kg-1 acetaminophen po were given. Sedation and anxiety scores were recorded preoperatively. Haemodynamic changes, blood loss, recovery scores, and the incidence of vomiting, hypotension, and airway obstruction were recorded.
Results:
Children who received clonidine had a higher incidence of preoperative sedation (63%) than those receiving fentanyl (6%). Preinduction mean arterial pressure was lower in the clonidine group but required no intervention. VAS scores were similar throughout the observation period. There was no difference either in the number of morphine or codeine rescue doses administered or in the incidence of side effects.
Conclusion:
Oral clonidine is an effective analgesic and sedative for children undergoing tonsillectomy or adenotonsillectomy.
Related Concept Videos
Adrenergic Agonists: Therapeutic Uses
Emergency and Intensive Care Unit (ICU) applications: Pressor agents increase blood pressure, heart rate, and contractility in shock and organ failure situations. Dopamine can induce vasodilation and stimulate adrenoceptors. Endogenous catecholamines are effective in treating cardiogenic shock. α2-agonists like clonidine can reverse anesthesia-induced hypertension.
Allergies and anaphylaxis:...
Local Anesthetics: Pharmacokinetics
Local Anesthetics: Clinical Application as Epidural Anesthesia
Since epidural anesthetics can be infused through an epidural catheter, all types of drugs, including short-acting ones, can be administered. Chloroprocaine and lidocaine are examples of short and long-duration anesthetics, respectively. Bupivacaine...
Analgesia and Pain Management
Opioid Analgesics: Synthetic and Semisynthetic Opioids
Parenteral Anesthetics: Overview

