Oxygen saturation falls late in neuromuscular respiratory failure; by the time it drops, the patient may be close to arrest. Measure respiratory muscle strength directly and repeatedly — forced vital capacity, or a single-breath count at the bedside where spirometry is not available.
Watch for bulbar weakness, a weak cough, use of accessory muscles, paradoxical breathing and a rising heart rate. A falling trend matters more than one value.
Review the drug chart: aminoglycosides, fluoroquinolones, macrolides, magnesium and some beta-blockers can worsen myasthenia.
- Track forced vital capacity or single-breath count serially
- Do not rely on oxygen saturation to detect impending failure
- Look for bulbar weakness, weak cough and paradoxical breathing
- Check for drugs that worsen myasthenia, including aminoglycosides and fluoroquinolones
Why it matters
Normal saturation falsely reassures in early neuromuscular respiratory failure.
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