Effect of Magnesium Sulphate Infusion on Lung Mechanics and Oxygenation in COPD Patients Undergoing Total Laryngeal

Study Overview
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Brief Summary
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Chronic Obstructive Pulmonary Disease [COPD] is a major cause of chronic morbidity and mortality worldwide. COPD is characterized by persistent progressive airflow limitation that adversely affects the ventilation/perfusion (V/Q) matching and mechanics of the respiratory muscles and leads to hypoventilation and reduced gas transfer. COPD was identified as a significant comorbidity associated with increased incidences of postoperative pulmonary complications and prolonged hospital stay. MgSO4 either intravenous or inhalational has been shown to promote bronchodilation and to improve lung function in asthmatic patients. MgSO4 either intravenous or inhalational has been shown to promote bronchodilation and to improve lung function in asthmatic patients. Administration of MgSO4 in patients with stable COPD was associated with reduced lung hyperinflation and improvement of respiratory muscle strength. This randomized control trial is designed to assess the effect of intravenous MgSO4 infusion on oxygenation and pulmonary mechanics and incidence of postoperative pulmonary complications and length of hospital stay in patients with COPD undergoing cancer larynx surgery.

Official Title
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Effect of Intravenous Infusion of Magnesium Sulphate on Arterial Oxygenation and Pulmonary Mechanics in Patients With Chronic Obstructive Pulmonary Diseases Undergoing Cancer Larynx Surgery. A Randomized Controlled Trial

Conditions
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Chronic Obstructive Pulmonary Diseases

Intervention / Treatment
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* Drug: Magnesium Sulphate


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients undergoing cancer larynx surgery (partial laryngectomy, total laryngectomy with or without neck dissection). Age more than 40 years old ASA physical status II and III. Diagnosed as having COPD by preoperative spirometry. The classification is bases on the post-bronchodilators forced expiratory volume in the first second (FEV1). Mild COPD is diagnosed when FEV1 is > 80% of predicted while moderate COPD is diagnosed when FEV1 is < 80% and > 50% of predicted and sever COPD is diagnosed when FEV1 is < 50% and > 30% of predicted Exclusion Criteria: o Patients with heart failure. History with arrhythmias or treatment with antiarrhythmic drugs. Patient with heart block or on beta blockers or calcium channel blockers. Patients with impaired renal function (creatinine > 2) Patients with impaired liver function (ALT more than 2 folds). Patient with combined restrictive and obstructive pulmonary disease. Patients with preoperative tracheostomy. Patients with huge mass obstructing > 50% of the view. (due to its influence on the spirometry measurements).

Ages Eligible for Study
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Minimum Age: 40 Years
Maximum Age: 80 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Supportive Care
Allocation: Randomized
Intervention Model: Parallel Assignment
Interventional Model Description: Intra-operative intravenous infusion of magnesium sulphate in patients with chronic obstructive pulmonary diseases undergoing total laryngectomy and assess the influence on arterial oxygenation and pulmonary Mechanics in
Masking: Double


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Mg-group<br>10% MgSO4 solution will be used, a loading dose of 30mg/kg over 20 min (equivalent to infusion rate of 0.9 ml/kg/hr for 20 min) will be given followed by continuous infusion of 10mg/kg/hr (equivalent to infusion rate of 0.1ml/kg/hr). | Drug: Magnesium Sulphate<br>* intra-operative infusion of of 10% MgSO2 , stating by a laoding dose of 30be used, a loading dose of 30 mg/kg over 20 min followed by continuous infusion of 10 mg/kg/hr accomplish the total laryngectomy.<br>|
| No Intervention: Control group<br>In control group, same rates of infusion for loading and maintenance will be applied using 0.9 normal saline. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| lung oxygenation | PaO2/FiO2 immediately after arrival to the PACU | over a period of 6-8 hours, from the time of induction of general anesthesia until time of patients discharge from the PACU. | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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magnesium sulphate, chronic obstructive pulmonary diseases