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Sedative and Analgesic Effects of Dexmedetomidine Versus Ketamine in Patients Undergoing Varicocelectomy Under Spinal Anaesthesia: A Prospective Randomized Comparative Trial

NCT07214701 · Status: NOT_YET_RECRUITING · Phase: PHASE4 · Type: INTERVENTIONAL · Enrollment: 58

Last updated 2025-10-09

No results posted yet for this study

Summary

The demand for safe and effective sedation during spinal anesthesia has increased in recent years, particularly in ambulatory and minor surgical procedures. The ideal sedative agent should provide adequate anxiolysis and comfort, maintain cardiorespiratory stability, and allow rapid recovery without significant adverse effects .

Ketamine, a phencyclidine derivative, produces sedation, analgesia, and amnesia while maintaining airway reflexes and spontaneous respiration. However, it is often associated with undesirable psychomimetic reactions and sympathetic stimulation, including tachycardia and hypertension .

In contrast, dexmedetomidine, a highly selective α2-adrenergic agonist, provides cooperative sedation, analgesia, and reduced anesthetic requirements, but it may cause bradycardia and hypotension, particularly at higher doses .

The combination of ketamine and dexmedetomidine (often referred to as "Ketadex") has recently gained attention due to its synergistic effects. Evidence suggests that this combination improves hemodynamic stability, decreases emergence agitation, and provides superior analgesia compared to either agent alone \[4,5\]. Moreover, ketamine counteracts the bradycardia and hypotension induced by dexmedetomidine, while dexmedetomidine mitigates ketamine-induced psychomimetic side effects .

Despite these advantages, the optimal dosing regimen and comparative efficacy of the two drugs when used individually remain subjects of clinical debate. Recent randomized controlled trials comparing intravenous dexmedetomidine and ketamine during spinal anesthesia reported differences in sedation quality, hemodynamic stability, and recovery profile . Therefore, this study aims to compare the sedative and hemodynamic effects of intravenous dexmedetomidine versus ketamine infusion in patients undergoing varicocelectomy under spinal anesthesia.

the study aim to Compare sedative, analgesic efficacy, and safety profile of intravenous dexmedetomidine versus ketamine in patients undergoing varicocelectomy under spinal anaesthesia

Conditions

  • Varicocelectomy

Interventions

DRUG

Ketamine (0.5 mg/kg)

Intravenous infusion of ketamine 0.5 mg/kg over 10 minutes before spinal injection, diluted in 50 ml 0.9% NaCl Saline

DRUG

Dexmedetomidine

Intravenous infusion of dexmedetomidine 0.25 μg/kg over 10 minutes before spinal injection, diluted in 50 ml 0.9% NaCl Saline

Sponsors & Collaborators

  • Assiut University

    lead OTHER

Study Design

Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
QUADRUPLE
Model
PARALLEL

Eligibility

Min Age
18 Years
Max Age
40 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2025-11-01
Primary Completion
2026-11-01
Completion
2026-12-01
FDA Drug
Yes

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07214701 on ClinicalTrials.gov