Stefano Isgrò1, Alberto Zanella1, Chiara Sala1, Giacomo Grasselli2, Giuseppe Foti2, Antonio Pesenti1,2, Nicolò Patroniti3,4. 1. Department of Experimental Medicine, Azienda Ospedaliera San Gerardo, University of Milano-Bicocca, via Cadore 48, 20048, Monza (MI), Italy. 2. Department of Perioperative Medicine and Intensive Care, San Gerardo Hospital, Via Pergolesi 33, 20052, Monza (MI), Italy. 3. Department of Experimental Medicine, Azienda Ospedaliera San Gerardo, University of Milano-Bicocca, via Cadore 48, 20048, Monza (MI), Italy. nicolo.patroniti@unimib.it. 4. Department of Perioperative Medicine and Intensive Care, San Gerardo Hospital, Via Pergolesi 33, 20052, Monza (MI), Italy. nicolo.patroniti@unimib.it.
Abstract
PURPOSE: We investigated the effects of periodical high pressure breaths (SIGH) or biphasic positive pressure ventilation (BIPAP) during helmet continuous positive airway pressure (CPAP) in patients with acute hypoxic respiratory failure. METHODS: We used a recently developed electromechanical expiratory valve (TwinPAP, StarMed, Mirandola, Italy), which is time-cycled between two customizable positive end-expiratory pressure (PEEP) levels. We studied 21 patients (67 ± 17 years old) undergoing helmet CPAP. Continuous flow CPAP system was set at 60 l/min flow rate while maintaining clinical FiO(2) (51 ± 15%). Five steps, lasting 1 h each, were applied: (1) spontaneous breathing with PEEP 0 cmH(2)O (SB), (2) CPAP with PEEP 8 cmH(2)O (CPAP(basal)), (3) low PEEP, 8 cmH(2)O, for 25 s and high PEEP, 25 cmH(2)O, for 5 s (SIGH), (4) low PEEP, 8 cmH(2)O, for 3 s and high PEEP, 20 cmH(2)O, for 3 s (BIPAP), (5) CPAP with PEEP 8 cmH(2)O (CPAP(final)). We randomized the sequence of SIGH and BIPAP. RESULTS: PaO(2) was significantly higher during all steps compared to SB. When compared to CPAP(basal), both SIGH and BIPAP induced a further increase in PaO(2). PaO(2) during SIGH and BIPAP were not different. The oxygenation improvement was maintained during CPAP(final). CONCLUSIONS: Superimposed, nonsynchronized positive pressure breaths delivered during helmet CPAP by means of the TwinPAP system may improve oxygenation in patients with acute hypoxemic respiratory failure, even at a rate as low as two breaths per minute.
PURPOSE: We investigated the effects of periodical high pressure breaths (SIGH) or biphasic positive pressure ventilation (BIPAP) during helmet continuous positive airway pressure (CPAP) in patients with acute hypoxic respiratory failure. METHODS: We used a recently developed electromechanical expiratory valve (TwinPAP, StarMed, Mirandola, Italy), which is time-cycled between two customizable positive end-expiratory pressure (PEEP) levels. We studied 21 patients (67 ± 17 years old) undergoing helmet CPAP. Continuous flow CPAP system was set at 60 l/min flow rate while maintaining clinical FiO(2) (51 ± 15%). Five steps, lasting 1 h each, were applied: (1) spontaneous breathing with PEEP 0 cmH(2)O (SB), (2) CPAP with PEEP 8 cmH(2)O (CPAP(basal)), (3) low PEEP, 8 cmH(2)O, for 25 s and high PEEP, 25 cmH(2)O, for 5 s (SIGH), (4) low PEEP, 8 cmH(2)O, for 3 s and high PEEP, 20 cmH(2)O, for 3 s (BIPAP), (5) CPAP with PEEP 8 cmH(2)O (CPAP(final)). We randomized the sequence of SIGH and BIPAP. RESULTS: PaO(2) was significantly higher during all steps compared to SB. When compared to CPAP(basal), both SIGH and BIPAP induced a further increase in PaO(2). PaO(2) during SIGH and BIPAP were not different. The oxygenation improvement was maintained during CPAP(final). CONCLUSIONS: Superimposed, nonsynchronized positive pressure breaths delivered during helmet CPAP by means of the TwinPAP system may improve oxygenation in patients with acute hypoxemic respiratory failure, even at a rate as low as two breaths per minute.
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