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Acute Respiratory Failure — Emergency

Acute respiratory failure is a life-threatening inability of the lungs to maintain adequate gas exchange and demands rapid airway, oxygen and ventilation support.

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

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

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

What is Acute Respiratory Failure — Emergency?

Acute respiratory failure is a clinical syndrome in which the respiratory system fails to maintain adequate gas exchange, resulting in hypoxaemia (PaO₂ <60 mmHg) and/or hypercapnia (PaCO₂ >50 mmHg) with acidosis.

Type 1 (hypoxaemic) failure is caused by ventilation-perfusion mismatch, shunt or diffusion impairment — typical of pneumonia, ARDS, pulmonary oedema, pulmonary embolism. Type 2 (hypercapnic) failure results from alveolar hypoventilation — COPD exacerbation, neuromuscular disease, opioid overdose, severe asthma.

Diagnosis is based on clinical signs (dyspnoea, accessory muscle use, cyanosis, altered mental status), pulse oximetry (SpO₂ <90%), arterial blood gas analysis and chest imaging.

Management is determined by the underlying cause and ventilatory status: oxygen therapy, non-invasive ventilation (CPAP/BiPAP), high-flow nasal oxygen, or invasive mechanical ventilation when these fail.

Symptoms

Severe shortness of breath, tachypnoea (>30 breaths/min)
Use of accessory muscles, retractions, paradoxical breathing
Cyanosis (lips, fingertips), pallor, sweating
Tachycardia, hypertension early; hypotension and bradycardia late
Altered mental status — confusion, agitation, somnolence, coma
Inability to speak full sentences, tripod position
SpO₂ <90% on room air or rapidly falling

Risk Factors

Pre-existing chronic lung disease (COPD, asthma, ILD)
Heart failure, pulmonary hypertension, valvular disease
Neuromuscular disorders (myasthenia gravis, ALS, Guillain-Barré)
Obesity-hypoventilation syndrome and obstructive sleep apnoea
Opioid, sedative or alcohol overdose
Pneumonia, sepsis, trauma, post-operative state
Smoking, occupational exposures, immunosuppression

When to See a Doctor?

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

  • Sudden severe dyspnoea or inability to speak in full sentences requires immediate 112
  • Cyanosis, confusion or extreme weakness are signs of imminent respiratory arrest
  • Patients with home oxygen who deteriorate must be assessed urgently
  • Asthma attacks not responding to relievers within minutes need ED visit
  • Witnessed apnoea or respiratory arrest demands CPR and 112

Treatment Methods

01
Position upright, oxygen via nasal cannula or non-rebreather mask to target SpO₂ 92–96%
02
In COPD aim for SpO₂ 88–92% to avoid hypercapnic failure
03
Non-invasive ventilation (BiPAP) for COPD exacerbation, cardiogenic pulmonary oedema, hypercapnia
04
High-flow nasal oxygen (HFNO) for hypoxaemic failure (e.g., COVID, pneumonia)
05
Endotracheal intubation and mechanical ventilation for failure of NIV, decreased consciousness
06
Treat underlying cause: bronchodilators, antibiotics, diuretics, anticoagulation
07
ICU admission for ongoing monitoring, sedation, paralysis, prone positioning if ARDS

Which Department to Visit?

You can visit our Acil Servis 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.