High-flow oxygen via tracheostomy facilitates weaning from prolonged mechanical ventilation in patients with restrictive pulmonary dysfunction: two case reports

Table 1 Changes in respiratory parameters during high-flow oxygen via tracheostomy in Case 1

HFT day	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16
HFT setting
F_IO₂	0.25	0.25	0.25	0.25	0.25	0.25	0.25	0.25	0.25	0.25	0.25	0.25	0.25	0.25	0.25	0.25
Flow (L/minute)	40	40	40	40	40	40	40	20	15	15	15	15	15	15	15	15
RR (breaths/minute)	40	30	35	37	26	30	35	36	35	27	29	26	22	20	22	21
SpO₂ (%)	97	98	97	97	96	98	97	98	96	96	96	96	98	95	98	96
etCO₂ (mmHg)	47	41	40	39	42	42	40	41	39	35	34	35	37	35	38	41
V_T (mL)				240				260			300			300
Arterial blood gases
pH				7.46							7.47
PaCO₂ (mmHg)				47							44
PaO₂ (mmHg)				92							87
HCO₃⁻ (mmol/L)				32.5							31.2

Abbreviations: etCO₂ end-tidal carbon dioxide, F_IO₂ fraction of inspired oxygen, HFT high-flow oxygen via tracheostomy, HCO₃⁻ bicarbonate ion, PaCO₂ partial pressure of arterial carbon dioxide, PaO₂ partial pressure of arterial oxygen, RR respiratory rate, SpO₂ arterial oxygen saturation by pulse oximetry, V_T tidal volume (measured by Wright respirometer)

ISSN: 1752-1947