ory therapist is assessing a ventilator-dependent patient's ability to be weaned. the weaning protocol states that the patient can be weaned when the patient's spontaneous tidal volume is at least 3 ml/lb of the patient's ideal body weight, which is 60 kg (132 lb). the therapist measures the patient's spontaneous minute ventilation (ve) to be 8 l/min and the respiratory rate to be 20 breaths/min. what is the most appropriate recommendation?