Airway Safety, Hypoglycemia After Hyperkalemia, and COPD Pneumothorax

Clinical Lessons and Safety Alerts from ED GovCast Episode 9

Episode 9 of ED GovCast delivers three focused and practical learning points drawn from real-world ED experiences and national safety alerts.

From paediatric airway risks to metabolic emergencies and respiratory pitfalls, this episode reinforces the need for precision and vigilance in emergency care.

1. Paediatric Cuffed Tube Safety Alert

Overview

A recent national safety alert highlighted multiple cases of airway injury in children following inappropriate selection of cuffed endotracheal tubes (ETTs).

These incidents emphasize the importance of using the correct tube size formula and verifying cuff pressures.

Key Points

The APLS formula applies only to uncuffed tubes.

Standard formula: (Age/4) + 4 → uncuffed tube size.

For cuffed tubes, choose 0.5 mm smaller than the uncuffed size.

Use age-specific reference charts and pressure manometers to ensure cuff pressure < 20–25 cmH₂O.

Example:

A 4-year-old child → uncuffed 5.0 mm → use 4.5 mm cuffed tube.

Learning Point

Even minor overinflation or oversizing can lead to tracheal ischemia, stenosis, or vocal cord damage.

Ensure clear documentation of:

Tube type and size

Insertion depth

Cuff pressure on insertion

Governance Reminder: Airway safety is a shared responsibility between emergency, anaesthetic, and paediatric teams. Regular refresher training and adherence to charts save lives.

🔗 Further Reading: APLS Paediatric Airway Guidance

2. Preventing Hypoglycemia After Hyperkalemia Treatment

Case Overview

A patient treated for severe hyperkalemia (K⁺ 6.4–6.5 mmol/L) developed profound hypoglycemia (1.2 mmol/L) following standard insulin and glucose therapy.

Mechanism

Insulin drives potassium intracellularly — but also glucose — risking rebound hypoglycemia once the initial bolus effect wears off.

Evidence-Based Guidance

If pre-treatment glucose < 7.0 mmol/L, initiate:

Glucose 10% infusion at 50 mL/hour for 5 hours (total 25 g)

in addition to standard insulin/dextrose therapy.

Monitoring

Recheck blood glucose every 30–60 minutes for the next 4–6 hours.

Watch for signs of neurological compromise post-treatment.

Be cautious in renal failure where insulin clearance is prolonged.

Learning Point

Always follow insulin therapy for hyperkalemia with ongoing glucose support if baseline glucose is low or normal.

Hypoglycemia is preventable — but only if anticipated.

Governance Note: Include “post-hyperkalemia glucose check” in local treatment bundles to reduce incident recurrence.

🔗 Guideline Reference: UK Kidney Association – Hyperkalemia in Adults (2023)

3. Supraglottitis in a Young Adult

Case Overview

A 20-year-old woman presented with:

Sore throat (10/10 pain)

Fever 39°C

Hoarse voice

Tachycardia 140 bpm

Oropharyngeal exam appeared normal, but she struggled to swallow.

ENT evaluation confirmed supraglottitis on flexible nasendoscopy.

Management

Administer IV Dexamethasone and Adrenaline Nebulisations.

Give IV Ceftriaxone (or appropriate broad-spectrum antibiotic).

Maintain high-flow oxygen and prepare for airway management in a controlled environment.

Avoid unnecessary throat examination that may trigger obstruction.

Learning Point

Severe throat pain + hoarse voice + normal oropharynx = Supraglottitis until proven otherwise.

Early ENT involvement and airway readiness are crucial.

Do not delay escalation while waiting for imaging or lab confirmation.

🔗 Reference: ENT UK – Severe Sore Throat Management Guideline

4. Pneumothorax in a COPD Patient

Case Overview

A known COPD patient presented with:

Acute shortness of breath

Widespread wheeze

SpO₂ 85% on room air

Initially treated as COPD exacerbation, but minimal improvement prompted imaging.

CXR and CT confirmed a right-sided pneumothorax.

Management (BTS 2023 Guidelines)

For symptomatic or secondary pneumothorax → insert small-bore chest drain (≤14F).

High-flow oxygen to enhance nitrogen washout.

Avoid routine suction — reserve for non-resolving cases.

In COPD, consider surgical referral for recurrent or persistent air leaks.

Learning Point

In COPD, not all wheeze is bronchospasm — sometimes it’s air escaping through a collapsed lung.

Governance Reminder: Any “non-improving” COPD case must trigger reassessment, imaging, and senior review.

🔗 Reference: BTS Pleural Disease Guideline (2023)

Governance Reflection: Anticipate, Don’t React

Episode 9 emphasizes the governance principle of anticipation — preventing harm through awareness, not just reaction.

“Every emergency is predictable when we understand the pattern — safety begins with anticipation.”

FAQs: Key Learning Points from Episode 9

1. How do I size a paediatric cuffed ETT correctly-

Subtract 0.5 mm from the uncuffed tube size calculated by APLS. Always confirm with a chart and check cuff pressures.

2. Why does hypoglycemia occur after hyperkalemia therapy-

Insulin drives glucose intracellularly; without supplemental infusion, levels can drop precipitously.

3. When should supraglottitis be suspected-

If severe throat pain and hoarseness coexist with a normal throat exam — escalate immediately.

4. How should pneumothorax be managed in COPD-

Follow BTS guidance: small-bore drain, oxygen therapy, and avoid suction unless persistent.

5. What’s the overarching safety message-

Measure, monitor, and recheck — every protocol protects both patient and clinician.

Conclusion: Anticipation Is the New Emergency Skill

ED GovCast Episode 9 illustrates how subtle errors — like tube size, missing a glucose check, or assuming a diagnosis — can turn routine cases into critical events.

True clinical governance means seeing the risk before it happens, and embedding preventive steps into daily ED practice.

“The best emergency clinicians don’t just act fast — they think ahead.”

🔗 References & Further Reading:

APLS Paediatric Airway Guidance

UK Kidney Association – Hyperkalemia Management (2023)

ENT UK – Severe Sore Throat Guideline

BTS Pleural Disease Guideline (2023)