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. 2020 Dec 2;2(12):e0292. doi: 10.1097/CCE.0000000000000292

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Figure 2. — Comparison of performance Portsmouth Ventilator with the Drager Apollo (Drager, Lubeck, Germany) ventilator with ISO test numbers 1–7. Yellow waveform is airway pressure (cm H₂O) and blue waveform is tracheal/alveolar pressure. Left column is the standard ventilator and the right column is the Portsmouth Ventilator. PEEP = positive end-expiratory pressure.