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HFNC — High-Flow Nasal Cannula (Optiflow/THRIVE)

A comfortable alternative to NIV in hypoxemic respiratory failure, delivering heated, humidified oxygen-air mixtures at up to 60 L/min.

Written by: Saygı Hospital Health Guide Editorial Board
Published: · Last updated:

This content is for general information; please consult your physician for diagnosis and treatment.

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This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Göğüs Hastalıkları department. Book Appointment →

What is HFNC — High-Flow Nasal Cannula (Optiflow/THRIVE)?

High-Flow Nasal Cannula (HFNC — Optiflow/THRIVE) delivers heated (31-37°C) and humidified (100% humidity) oxygen-air mixtures at flow rates of 30-60 L/min with titratable FiO2 of 0.21-1.0. It is more comfortable than mechanical ventilation and better tolerated than NIV.

Physiologic effects: (1) anatomical dead-space washout (improves CO2 removal); (2) low-level PEEP (2-5 cmH2O, with mouth closed); (3) heating and humidification preserve mucociliary clearance; (4) reliable FiO2 delivery (standard masks have high variability); (5) high patient comfort (eating and speaking are still possible).

Evidence base: FLORALI (2015, NEJM) — in acute hypoxemic failure, HFNC improved survival compared with NIV and standard oxygen. The ROX score [SpO2/FiO2/RR] predicts HFNC success — a ROX <3.85 at 4 or 12 hours suggests high risk of failure. Post-extubation in high-risk patients (COPD, heart failure) reduces reintubation.

THRIVE (Transnasal Humidified Rapid-Insufflation Ventilatory Exchange) — used for difficult-airway pre-oxygenation and apneic oxygenation (during surgery). The NODESAT study showed it extends safe apnea time by 3-4×.

Symptoms

Acute hypoxemic respiratory failure — P/F 100-300; consider HFNC instead of NIV (especially pneumonia, early ARDS)
Post-extubation — prevention of reintubation in high-risk patients (COPD, heart failure, >4 days of ventilation)
Standard mask insufficient oxygen — SpO2 <92% despite a Venturi mask or non-rebreather
Difficult-airway pre-oxygenation — THRIVE technique for 3-5 minutes before intubation
Palliative care — in DNI/DNR patients where comfortable oxygen + comfort is prioritized

Risk Factors

Nasal obstruction / septal deviation — reduces HFNC efficacy
Craniofacial trauma/surgery — nasal route unavailable
History of epistaxis — possible dryness/bleeding despite heating/humidification
HFNC failure criteria (ROX <3.85, RR >30, or hemodynamic instability) — do not delay intubation
Pneumothorax — despite the low PEEP of HFNC, severe PTX requires a chest tube first

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Acute hypoxemic failure + standard oxygen insufficient — start HFNC
  • Calculate ROX in the first 1-2 hours — if <3.85, failure is likely; prepare for intubation
  • High-risk extubation — continue HFNC for 24-48 hours post-extubation

Treatment Methods

01
Initiation — flow 30-50 L/min (adult; 2 L/kg/min in pediatrics), titrate FiO2 to target SpO2 92-96%, temperature 37°C, use a cannula that fits fully in the nares (non-occlusive)
02
Patient education — close the mouth while breathing (for the PEEP effect); eating and speaking are allowed; reassure comfort
03
Monitoring — SpO2, RR, SaO2 (PaO2), ROX score at 1, 2, 4, 8, and 12 hours. ROX = (SpO2/FiO2) / RR; >4.88 predicts success, 3.85-4.88 indeterminate, <3.85 suggests failure
04
Flow escalation — if dyspnea or falling SpO2 develops, raise flow to 60 L/min and increase FiO2; if still inadequate, escalate to NIV or intubate
05
Weaning — FiO2 <0.4 + flow 30 L/min stable → transition to nasal cannula or Venturi mask
06
Special situations — cautious in COPD (low but real CO2-retention risk); safe in pregnancy; in pediatrics, flow is weight-based

Which Department to Visit?

You can visit our Göğüs Hastalıkları department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.