Block Pressor Response to Intubation

Assiut University102 enrolled

Overview

Laryngoscopy and endotracheal intubation are necessary for effective control of airway and ventilation, but it has deleterious effects such as hypertension and disrhythmia

Fast-track laparoscopic gynecological surgery usually done under general anesthesia (GA). Laryngoscopy and endotracheal intubation are necessary for effective control of airway and ventilation, but it has deleterious effects such as hypertension and disrhythmia. These hemodynamic changes are due to the reflex sympathetic activity and the magnitude of response is directly proportional to the duration and strength of laryngoscopy. Several drugs and techniques have been tried to attenuate the stress response to laryngoscopy and endotracheal intubation, but none of them have proven to be ideal. Lidocaine is an amide synthetic local anesthetic, which is used in treatment of ventricular dysrhythmias and as a prophylaxis in ventricular tachyarrhythmia. It has cardio stabilizing action. Bromage showed that its intravenous (IV) use blunted pressure response to intubation. An IV dose of lidocaine 1.5 mg/kg has been proved to attenuate stress responses during laryngoscopy and intubation. Dexmedetomidine is a highly selective alpha 2 receptor agonist and possesses the properties of sedation, analgesia, and opioid sparing effect. It has been shown to reduce the laryngeal stress response, reduce the requirement of intravenous (IV) anesthetics, and provides hemodynamic stability. Magnesium sulphate (Mg SO4) is the fourth most abundant cation in the body and the second most abundant intracellular cation. It activates many of the enzyme system. Mg SO4 inhibits the release of catecholamines from the adrenal medulla and adrenergic nerve endings and is effective in attenuating the blood pressure (BP) response to tracheal intubation. Puri et al showed that MgSO4 50 mg/kg administered before laryngoscopy could attenuate the pressor response to tracheal intubation better than lidocaine.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

PREVENTION

Masking

QUADRUPLE

Enrollment

102

Conditions

Intubation Complication

Interventions

DexmedetomidineDRUG

Patients will receive IV dexmedetomidine 0.5 μg /kg diluted up to 10 ml with normal saline infused over 10 min before induction of anesthesia, and 10 ml of normal saline immediately before induction of anesthesia.

Magnesium sulphateDRUG

Patients will receive IV magnesium sulphate 50 mg/kg diluted up to 10 ml with normal saline infused slowly over 10 min before induction of anesthesia, and 10 ml of normal saline immediately before induction of anesthesia.

LidocaineDRUG

Patients will receive IV lidocaine 1.5 mg/ kg diluted up to 10 ml with normal saline immediately before induction of anesthesia and 10 ml of normal saline infused over 10 min before induction of anesthesia.

Eligibility

Sex: FEMALEMin age: 23 YearsMax age: 40 Years

Medical Language ↔ Plain English

Inclusion Criteria: * ASA physical status I-II * Age between 23 to 40 years * With airway of Mallampati grade I and II * Elective diagnostic laparoscopic gynecologic surgery under general anesthesia with endotracheal intubation Exclusion Criteria: * Mallampatti grading III and IV, anticipated difficult intubation * Body mass index (BMI \> 35 kg/m2), full stomach, pregnancy * Emergency surgery * History of cardiac or neurological disease or patient with asthma * History of Hypersensitivity to the study drugs * Advanced hepatic or renal failure. * Patients in whom the duration of laryngoscopy lasted more than 20 seconds * Patient refusal.

Outcomes

Primary Outcomes

Heart rate (HR)

Beats/ minute

Time frame: 10 minutes before intubation to one hour after surgery

Central Contacts

Seham M. Moeen, MD

CONTACT

01006386324 seham.moeen@aun.edu.eg

ARMIA M. LABEB, Msc

CONTACT

01091507030

Data from ClinicalTrials.gov

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