Early Versus Late Extubation in Myasthenia Gravis Patients

MYASTHENIA GRAVIS (MG) is an autoimmune disease characterized by varying degrees of muscle weakness and fatigability worsened with exertion and relieved with rest。Thymectomy plays an important role in the management of these patients because a consistent association between myasthenic and thymic pathology has been recognized.The need for prolonged mechanical ventilation in these patients after thymectomy is determined by their preoperative condition and various perioperative risk factors. Leventhal et al proposed a preoperative scoring system to predict the need for postoperative mechanical ventilation in myasthenic patients undergoing thymectomy based on the following 4 criteria: duration of MG, chronic respiratory disease, dose of pyridostigmine, and vital capacity. However, some investigators discovered that the Leventhal criteria may not be the sole benchmark and that other criteria such as severity of myasthenia,history of myasthenic crisis, and presence of thymoma may be more important in predicting the necessity for prolonged mechanical ventilation after thymectomy. Naguib et al described multivariate determinants of the need for postoperative ventilation after thymectomy in MG patients predominantly on the basis of pulmonary function tests. In addition, the prevalence and presentation of MG may be variable among different ethnic groups. However, there are very few large studies investigating the determinants of prolonged mechanical ventilation after thymectomy. The authors describe the parameters associated with prolonged mechanical ventilation after trans-sternal thymectomy at their institution.