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. 2015 Jul 9;2015:bcr2015209716. doi: 10.1136/bcr-2015-209716

Table 2.

Blood gas measurements performed during subsequent outpatient review

Date, Time pH pCO2 (kPa) pO2 (kPa) St. HCO3 (mmol/L) NIV therapy Clinical status
27-5-14, 13.18 7.31 10.10 7.65 30.2 IPAP 30, EPAP 6
S/T mode, RR 14
FiO2 0.21
Nasal mask NIV chinstrap nocte, and 2×2 h daytime
Sample off NIV. Trial of mouthpiece ventilation after this: mode MPV PC, IPAP 34, EPAP 0, RR 0, FiO2 0.21
24-6-14, 11.38 7.32 8.35 9.09 26.9 Nocte as above. Daytime MPV: Mode MPV PC
IPAP 34, EPAP 0
RR 0, FiO2 0.21.
Arterial blood taken off NIV and on room air
24-6-14, 13.11 7.43 6.13 5.13 28.2 30 min MPV use as above (FiO2 0.21) Note: Venous blood taken for other clinical reasons.
Patient reports reduced work of breathing on MPV

EPAP, expiratory positive airway pressure; measured in cm H2O; IPAP, inspiratory positive airway pressure; MPV, mouthpiece ventilation; NIV, non-invasive ventilation; S/T, spontaneous-timed mode; RR, respiratory rate (breaths per minute).