title: New treatment of acute hypoxemic respiratory failure: noninvasive pressure support ventilation delivered by helmet--a pilot controlled trial.
abstract: OBJECTIVE
  To assess the efficacy of noninvasive pressure support ventilation (NPSV) using a new special helmet as first-line intervention to treat patients with hypoxemic acute respiratory failure (ARF), in comparison to NPSV using standard facial mask.
  
  
  METHODS
  Prospective clinical pilot investigation with matched control group in three intensive care units of university hospitals.
  
  
  METHODS
  Thirty-three consecutive patients without chronic obstructive pulmonary disease and with hypoxemic ARF (defined as severe dyspnea at rest, respiratory rate >30 breaths/min, PaO2:FiO2 < 200, and active contraction of the accessory muscles of respiration) were enrolled. Each patient treated with NPSV by helmet was matched with two controls with ARF treated with NPSV via a facial mask, selected by simplified acute physiologic score II, age, PaO2/FiO2, and arterial pH at admission. Primary end points were the improvement of gas exchanges, the need for endotracheal intubation, and the complications related to NPSV.
  
  
  RESULTS
  The 33 patients and the 66 controls had similar characteristics at baseline. Both groups improved oxygenation after NPSV. Eight patients (24%) in the helmet group and 21 patients (32%) in the facial mask group (p = .3) failed NPSV and were intubated. No patients failed NPSV because of intolerance of the technique in the helmet group in comparison with 8 patients (38%) in the mask group (p = .047). Complications related to the technique (skin necrosis, gastric distension, and eye irritation) were fewer in the helmet group compared with the mask group (no patients vs. 14 patients (21%), p = .002). The helmet allowed the continuous application of NPSV for a longer period of time (p = .05). Length of stay in the intensive care unit, intensive care, and hospital mortality were not different.
  
  
  CONCLUSIONS
  NPSV by helmet successfully treated hypoxemic ARF, with better tolerance and fewer complications than facial mask NPSV.
authors: Istituto di Anestesiologia e Rianimazione, Università Cattolica del Sacro Cuore, Rome, Italy. max.antonelli@flashnet.it
authors: Massimo
authors: M
authors: Antonelli
authors: Giorgio
authors: G
authors: Conti
authors: Paolo
authors: P
authors: Pelosi
authors: Cesare
authors: C
authors: Gregoretti
authors: Mariano Alberto
authors: MA
authors: Pennisi
authors: Roberta
authors: R
authors: Costa
authors: Paolo
authors: P
authors: Severgnini
authors: Maurizio
authors: M
authors: Chiaranda
authors: Rodolfo
authors: R
authors: Proietti
mesh_terms: D000328:Adult; D004867:Equipment Design; D005260:Female; D006801:Humans; D000860:Hypoxia / Q000628:therapy*; D007362:Intensive Care Units; D008297:Male; D008875:Middle Aged; D010865:Pilot Projects; D011175:Positive-Pressure Respiration / Q000295:instrumentation*; D012131:Respiratory Insufficiency / Q000628:therapy*