What is the oxygen saturation target in a COPD exacerbation?

An SpO2 of 88 to 92 per cent for patients at risk of hypercapnic respiratory failure, pending arterial blood gas results, according to the BTS emergency oxygen guideline. Once the gas is known the target is adjusted, and a patient with a normal PaCO2 may be moved to 94 to 98 per cent.

What steroid dose does NICE recommend for a COPD exacerbation?

NICE NG115 recommends 30 mg oral prednisolone daily for 5 days, used alongside other therapies in all patients admitted to hospital with an exacerbation, unless there are significant contraindications. Patients should be given clear instructions on stopping.

When is NIV started in a COPD exacerbation?

NG115 says NIV is the treatment of choice for persistent hypercapnic ventilatory failure during exacerbations despite optimal medical therapy. It should be delivered in a dedicated setting by trained staff, with a clear plan for deterioration and an agreed ceiling of therapy before it starts.

Should the nebuliser be driven by oxygen in COPD?

Not if the patient is hypercapnic or acidotic. NG115 says the nebuliser should then be driven by compressed air to avoid worsening hypercapnia, with any oxygen needed given at the same time through nasal cannulae. The driving gas should always be specified on the prescription.

Which investigations does NICE require on arrival with a COPD exacerbation?

NG115 1.3.3 lists a chest X-ray, arterial blood gases with the inspired oxygen concentration recorded, an ECG, full blood count and urea and electrolytes, a theophylline level in patients taking it, sputum culture if purulent, and blood cultures if pyrexial.

Who decides whether a COPD patient is intubated?

A senior decision, usually the intensive care and respiratory consultants with the patient and family. NG115 says suitability should take account of functional status, BMI, need for oxygen when stable, comorbidities and previous intensive care admissions, and that neither age nor FEV1 should be used in isolation.

COPD Exacerbation — CT1 Anaesthetics Interview Clinical Judgement Answer

A COPD exacerbation is a sustained, acute worsening of breathlessness, cough or sputum beyond the patient's normal day-to-day variation, and the ward decision it tests is how much oxygen to give. NICE NG115 and the BTS emergency oxygen guideline set the answer: a target of 88 to 92 per cent until the blood gas says otherwise, steroid and bronchodilator early, and non-invasive ventilation for persistent hypercapnic failure. For a CT1 anaesthetics candidate the station is about titration, gases and knowing when NIV has failed.

Key takeaways

The BTS emergency oxygen guideline (2017) sets a target SpO2 of 88 to 92 per cent for patients at risk of hypercapnic respiratory failure, including COPD, pending blood gas results, against 94 to 98 per cent for most other acutely ill patients.
NICE NG115 says that if the patient is hypercapnic or acidotic the nebuliser should be driven by compressed air, with oxygen given at the same time by nasal cannulae if needed.
NG115 recommends 30 mg oral prednisolone daily for 5 days in all patients admitted with an exacerbation, in the absence of significant contraindications.
Every patient arriving at hospital with an exacerbation should have arterial blood gases with the inspired oxygen concentration recorded, a chest X-ray, an ECG, full blood count and urea and electrolytes (NG115 1.3.3).
NIV is the treatment of choice for persistent hypercapnic ventilatory failure during exacerbations despite optimal medical therapy, delivered in a dedicated setting with a plan for deterioration and an agreed ceiling of treatment.
Suitability for intubation is judged on functional status, BMI, need for oxygen when stable, comorbidities and previous intensive care admissions, not on age or FEV1 alone.

How do you recognise a COPD exacerbation on the ward?

You recognise a COPD exacerbation clinically. NG115 states that the diagnosis is made clinically and does not depend on investigations: a sustained worsening of breathlessness, cough, sputum volume or sputum colour, acute in onset and beyond the patient's usual variation.

What the investigations do is tell you how severe it is and what else is going on. A chest X-ray finds the pneumothorax or consolidation, the ECG the arrhythmia or ischaemia, and the blood gas the hypercapnia that changes the oxygen plan.

NG115's Table 7 lists what pushes a COPD exacerbation towards hospital rather than home: severe breathlessness, cyanosis, worsening peripheral oedema, impaired consciousness, acute confusion, rapid onset, an SaO2 below 90 per cent, an arterial pH below 7.35 or a PaO2 below 7 kPa.

In practice, the ward patient is already in. The question is whether they are the hypercapnic, acidotic patient who needs NIV within the hour, or the hypoxic, non-acidotic patient who will settle with nebulisers and steroid.

What is the A to E and first-hour management of a COPD exacerbation?

The first hour of a COPD exacerbation is controlled oxygen to 88 to 92 per cent, an arterial blood gas with the FiO2 written down, nebulised bronchodilator, steroid, and antibiotics if the sputum is purulent, with a repeat gas after the changes.

Airway and breathing

Give oxygen by a Venturi mask to a target SpO2 of 88 to 92 per cent, the BTS range for patients at risk of hypercapnic respiratory failure, and record the inspired concentration.
Take an arterial blood gas on arrival, as NG115 requires, and repeat it regularly according to response. NG115 warns that pulse oximetry tells you nothing about PaCO2 or pH.
Nebulised short-acting bronchodilator. If the patient is hypercapnic or acidotic, drive the nebuliser with air and give any oxygen by nasal cannulae alongside, as NG115 1.3.11 states.
Once the gas is back, adjust the target. The BTS guideline says to move the range once arterial blood gas results are known, which may mean 94 to 98 per cent if the PaCO2 is normal.

Circulation, disability and exposure

ECG, full blood count and urea and electrolytes, and a theophylline level if the patient takes it (NG115 1.3.3).
Sputum for microscopy and culture if purulent, and blood cultures if pyrexial.
Prednisolone 30 mg daily for 5 days, started now.
Assess consciousness and drowsiness, which in a COPD patient on oxygen means hypercapnia until the gas proves otherwise.

What is the controlled-oxygen threshold in COPD, and why 88 to 92 per cent?

The controlled-oxygen threshold in a COPD exacerbation is an SpO2 of 88 to 92 per cent, set by the BTS emergency oxygen guideline for anyone at risk of hypercapnic respiratory failure, because uncontrolled oxygen in these patients can cause respiratory depression and a rising PaCO2.

NG115 makes the same point in one line: inappropriate oxygen therapy in people with COPD may cause respiratory depression. The guideline asks you to keep saturations within an individualised target range rather than a fixed number.

The range is a holding position, not a life sentence. The BTS guideline says the target is used pending blood gas results, and is then adjusted. A patient with a normal PaCO2 on the first gas can be moved to 94 to 98 per cent.

However, the reverse mistake is worse. A hypoxic COPD patient still needs oxygen. The controlled target means titrating, not withholding, and a good candidate says that a saturation of 80 per cent is treated whatever the diagnosis.

What is the definitive management of a COPD exacerbation?

Definitive management of a COPD exacerbation is steroid for five days, antibiotics where indicated by the NICE antimicrobial prescribing guideline for exacerbations, bronchodilator weaned back to hand-held inhalers as the patient stabilises, and NIV or invasive ventilation for those who fail medical therapy.

According to NG115, oral corticosteroids are used, alongside other therapies, in all people admitted to hospital with an exacerbation in the absence of significant contraindications, at 30 mg prednisolone daily for 5 days. Patients need clear instructions on why, when and how to stop.

Intravenous theophylline is an adjunct only if there is an inadequate response to nebulised bronchodilators, with levels checked within 24 hours. Doxapram is reserved for when NIV is unavailable or inappropriate.

NG115 recommends switching to hand-held inhalers as soon as the condition has stabilised, because it allows earlier discharge, and it supports hospital-at-home and assisted-discharge schemes as safe alternatives to a longer stay. Recovery is monitored by symptoms and functional capacity, with oximetry for non-hypercapnic patients.

When do you escalate a COPD exacerbation, and who do you call?

You escalate a COPD exacerbation when the blood gas shows persistent hypercapnic ventilatory failure despite optimal medical therapy, because NG115 says NIV is then the treatment of choice, and NIV needs the medical registrar, the respiratory or critical care team, and an agreed ceiling of care before it starts.

NG115 asks for NIV to be delivered in a dedicated setting by trained, experienced staff, with a clear plan covering what to do in the event of deterioration. That plan is the escalation conversation, and it should happen at the start, not when the mask is failing.

As the anaesthetic CT1, the call you receive is about the patient failing NIV. NG115 says hospitalised exacerbations should be treated on intensive care units, including invasive ventilation when necessary, and that suitability is judged on functional status, BMI, home oxygen, comorbidities and previous ICU admissions. Neither age nor FEV1 should be used in isolation.

Say who decides. Intubating a patient with end-stage COPD is a consultant decision, ideally made with the patient and family and with the respiratory team, and a good answer names the conversation rather than the drug.

What is the human-factors and reflective-practice angle in a COPD exacerbation?

The human-factors angle in a COPD exacerbation is the oxygen prescription: the harm is done slowly, by a well-meaning colleague who turns the flow up because the number looks low, and it is prevented by a written target on the chart.

The BTS guideline built its oxygen alert card for exactly this. A patient who carries one, and a chart that says 88 to 92 per cent, protects the patient from the next handover.

Reflective practice at the station wants a real event. Many candidates have seen a drowsy COPD patient on 15 litres through a reservoir mask. Describe what you found on the gas, what you changed, and what you now do differently when you prescribe oxygen.

Working under pressure is the ceiling-of-care conversation happening while the patient deteriorates. Show that you would bring the registrar in early rather than make that decision alone at 3 am.

What are the common mistakes candidates make with a COPD exacerbation?

The commonest mistake with a COPD exacerbation at interview is either withholding oxygen from a hypoxic patient or giving uncontrolled oxygen to a hypercapnic one. Both come from treating 88 to 92 per cent as a rule rather than a titration target.

Forgetting to record the inspired oxygen concentration with the blood gas, which makes the gas uninterpretable.
Driving the nebuliser with oxygen in an acidotic, hypercapnic patient. NG115 says air, with oxygen by nasal cannulae alongside.
Quoting a steroid dose from asthma. In COPD, NG115 says prednisolone 30 mg daily for 5 days.
Starting NIV without a plan for deterioration or an agreed ceiling of treatment.
Declaring a patient unsuitable for intensive care on age or FEV1 alone, which NG115 specifically warns against.
Never repeating the gas after changing the oxygen or starting NIV.

How this comes up at the CT1 anaesthetics interview

A COPD exacerbation comes up at the CT1 anaesthetics interview as a ward or emergency department call in the clinical judgement station, which ANRO marks on clinical judgement and decision making, reflective practice and working under pressure.

Clinical judgement is the oxygen target and the gas. Decision making is recognising failed medical therapy and starting NIV with a ceiling agreed. Reflective practice is the oxygen incident you have seen. Working under pressure is the family conversation at the bedside while the mask is on.

Expect the panel to add a second gas with a rising PaCO2 and a falling pH, then ask what you would do next. The anaestheticinterview scenarios are built the same way, with AI-marked spoken practice so that the answer is rehearsed out loud.

COPD Exacerbation and Controlled Oxygen