Dexmedetomidine Infusion Dose Versus Rapid Bolus Dose Before Tracheal Intubation.

Kasr El Aini Hospital

Status and phase: Enrolling; Phase 2

Conditions: Dexmedetomidine; Intubation Complication

Treatments: Drug: Dexmedetomidine bolus; Drug: Propofol; Drug: Atropine Sulfate; Drug: Dexmedetomidine infusion; Drug: Ephedrine

Study type: Interventional

Funder types: Other

Identifiers

NCT06327399

MS-373-2023

Details and patient eligibility

About

Dexmedetomidine bolus dose may provide similar or less hemodynamic changes (less bradycardia and less hypertension) than infusion dose during induction of anaesthesia and tracheal intubation.

Full description

Preoperative assessment of all patients undergoing elective surgical procedures under general anaesthesia comprises history taking, clinical examination, laboratory testing (complete blood count, kidney function tests, liver function tests), electrocardiogram, and chest X-ray. The study protocol will be explained to the patients, and their consent will be obtained. The patients will be continuously monitored in the operating room for heart rate, blood pressure, and oxygen saturation (baseline values). Then a 20-gauge cannula will be inserted.

Patients will be randomly assigned into two groups: Group A will receive Dexmedetomidine infusion dose of 1 mcg/kg diluted to 100 ml normal saline infused over 10 minutes and Group B will receive Dexmedetomidine bolus dose of 0.3 mcg/kg diluted to 10 mL normal saline administered intravenously over 60 seconds. Then Patients will be induced with propofol till loss of verbal contact, followed by atracurium 0.5 mg/kg IV. After 3 minutes, tracheal intubation will be performed with an appropriate size of cuffed tracheal tube and connected to end tidal CO2 monitor. After confirmation of bilateral equal air entry, it is connected to mechanical ventilation using isoflurane 1.2% for maintaining anesthesia and keeping end tidal CO2 between 35-40 mmHg, Ringer's solution at a rate 5ml/kg/hour IV will be infused for fluid maintenance. If heart rate falls below 45 bpm, rescue dose (500 mcg) of atropine will be given. If MAP decreases below 50 mmHg, boluses of 10 mg ephedrine will be given, while escalation of MAP will be treated by boluses of 50 mg propofol.

At the end of surgery, the inhaled gas is off and the patient is reversed with neostigmine 0.05mg/kg and atropine 0.01mg/kg, then extubation is done. The two groups will be observed for changes in hemodynamic parameters i.e. heart rate (HR) and mean arterial blood pressure at preinduction period (baseline), after 1 min from dexmeditomedine taking, after induction, at intubation and 1,3,5 and 10 min after intubation. No intervention will be allowed during these 10 minutes and morphine at a dose 0.1mg/kg will be used as analgesia for surgery after 10 minutes.

Enrollment: 70 estimated patients

Sex: All

Ages: 18 to 50 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• ASA I and II patients.
• Mallampati grade I and II.

Exclusion criteria

• Patient refusal.
• Morbid obesity.
• Predicted difficult airway/unanticipated difficult intubation or laryngoscopic attempt lasting greater than 15 seconds or two attempts or more.
• Patients with uncontrolled sepsis.
• Pregnancy or breast feeding.
• Patients with renal impairment i.e. SCr ≥ 1.5
• Any patient on regular intake of beta blockers or calcium channel blockers.
• CNS disorders.

Trial design

Primary purpose: Supportive Care

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Double Blind

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70 participants in 2 patient groups

Group A

Active Comparator group

Description:

patients will receive Dexmedetomidine infusion dose of 1 mcg/kg over 10 min.

Treatment:

Drug: Dexmedetomidine infusion

Drug: Propofol

Drug: Atropine Sulfate

Drug: Ephedrine

Group B

Active Comparator group

Description:

patients will receive Dexmedetomidine bolus dose of 0.3 mcg/kg over 60 seconds.

Treatment:

Drug: Propofol

Drug: Atropine Sulfate

Drug: Ephedrine

Drug: Dexmedetomidine bolus