Efficacy of a New Full Face Mask for Noninvasive Positive Pressure Ventilation: Masks for NPPV
Patients were chosen to receive the ventilatory support system or noninvasive ventilation via a volume ventilator based on their degree of comfort with each mode, and the ability to increase minute ventilation and improve gas exchange. After the initial evaluation for noninvasive ventilation, seven patients received the ventilatory support system and two patients required a portable volume ventilator.
Noninvasive mechanical ventilation was applied in each patient via an N CPAP mask (Respironics), an NO mask (Vitalog, Vital Signs), and the prototype TFM (Total, Respironics). A close-up view of the inside and outside of the TFM is shown in Figure 1 generic doxycycline.
Functional status was evaluated and graded with the following scale: l=impaired cognition; 2=awake, alert, and oriented; 3=chair bound; 4=independent in activities of daily living; 5=ambulatory, but homebound; 6=performs non-self-care activities at home (ie, cooking, housework, etc); and 7=performs activities outside of home.
The patient’s level of discomfort with the face mask was scaled as follows: 0=comfortable, 1=uncomfortable, and 2=very uncomfortable.
The level of dyspnea was scored in arbitrary units with a four-point scale: 0=no dyspnea; l = mild dyspnea; 2=moderate dyspnea; and 3=severe dyspnea.
The degree of air leakage for each mask was also scaled with a four-point scale using arbitrary units: 0=no leaks; l=one to three leaks per minute; 2=three to six leaks per minute; and 3=greater than six leaks per minute. Comparative Efficacy of the Various Masks During Shortterm NPPV: Baseline measurements of ventilatory variables (ie, minute ventilation, tidal volume, respiratory rate), and arterial blood gas tensions were performed in four patients during eup-neic ventilation. All patients then underwent three NPPV trials of 20 to 30 min duration to ensure stability during noninvasive ventilation using each of the three different masks (TFM, N, NO) in random order.
Figure 1. Close up of frontal (panel A) and side (panel B) views of the Total face mask.
Category: Respiratory Symptoms
Tags: face mask, hypercapnia, noninvasive ventilation, respiratory failure