 4. Design and Methods a. Study Design In a prospective, blinded Edi information blinded to the team clinical trail we will study the diaphragmatic activity that occur prior and following our standard extubation readiness test minimum pressure support trial. We will examine that diaphragmatic activity by examining the Edi prior to, during, and post the trial on every patient who qualifies. Furthermore, patients who fail ERT will be ventilated with the NAVA mode of ventilation. The entire protocol will be conducted on the Maquet Servo I ventilator 