Introduction:

One of the most feared emergencies during the instrumentation of the respiratory tract is bronchospasm. Magnesium sulfate, administered intravenously, has a bronchodilation effect by antagonizing calcium channels, inhibiting muscle contraction mediated by calcium and promoting bronchial smooth muscle relaxation.

Objective:

To evaluate the efficacy of magnesium sulfate administered intravenously in patients with bronchospasm during bronchoscopy.

Methods:

Observational, descriptive and cross-sectional study carried out with 20 patients, with bronchospasm, triggered by airway manipulation with flexible bronchoscope, treated with 50 mg/kg of magnesium sulfate, (maximum 2 g), administered intravenously for 5 min.

Results:

Men between 50-59 years (75%) predominated. All patients were smokers. 15 patients were classified with physical state ASA III. They suffered bronchospasm of mild intensity 60%, classified according to the clinic and monitoring of oxygen saturation. In 75% of the patients, the bronchospasm ceased after the treatment without administering any other medication. No adverse effects were recorded. No patient needed orotracheal intubation for ventilation or required hospitalization for more than 8 hours.

Conclusions:

Magnesium sulfate is a good pharmacological option for the emergency treatment of bronchospasm triggered by manipulation of the respiratory tract.

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