Porcine Study #4 was conducted in the same animal facility in the Boston area with the same 81 kg porcine as study #3. Another anesthesiologist, who had not seen MIT E-Vent before, was invited to participate. He was given a short explanation regarding the control box interface and functionalities of MIT E-Vent. See Operation.
The anesthesiologist quickly became familiar with the control system and was able to manipulate the minute ventilation and target arterial blood gas values without any difficulty.
Alarm systems and alarm snooze button were tested. High pressure alarm and low pressure (breathing circuit disconnect) alarms functioned as expected. The alarm snooze button allowed clinicians to silence the alarm while they trouble shot the problem at hand. Pressure alarms are described in Pressure Measuring.
Assist control mode was tested by slowing down the mandatory minute ventilation until the porcine subject started to take spontaneous breaths in between the mandatory volume control breaths. This was facilitated by reduced sedation. Once Assist Control mode was turned on, the ventilator delivered assisted breaths in sync with the porcine subject. This is described further in Controls.