“…The decision is usually based on the subjective assessments of physicians. The parameters that the physician takes in accounts are physiological factors, including maximal inspiratory pressure (Pimax) [10], [20], vital capacity (VC) [20], rapid shallow breathing index (RSBI) [23], minute ventilation (VE) [10], [21], pH and PCO [2], [16], APACHE II score, and blood urine nitrogen (BUN).…”