The effect of intravenous magnesium sulfate as a complementary therapy to COPD

INTERVENTION: Intervention 1: Intervention group: Magnesium sulfate (2%) Obiidi pharmaceutical company is mixed with 200 ml of normal saline and is given intravenous infusion intravenously in 20 minutes. Intervention 2: Control group: Normal saline 0.9% (Obeidi factory) is given 100 cc once, under slow given intravenous infusion intravenously. CONDITION: Chronic obstructive pulmonary disease. ; j44 PRIMARY OUTCOME: Number of breaths. Timepoint: Counting the number of breaths at the beginning of the study (before the intervention) and 45 minutes and 6 hours after starting magnesium sulfate. Method of measurement: We count the breath per one minute. SECONDARY OUTCOME: Blood pressure. Timepoint: before intervention and 45 minutes and 6 hours after intervention. Method of measurement: We get blood pressure using a manometer portable . INCLUSION CRITERIA: All patients with chronic pulmonary obstruction with moderate severity.