Which signs suggest imminent respiratory arrest in a patient with acute respiratory distress?

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In acute respiratory distress, signs that arrest is imminent include changes in mental status, fatigue of the breathing muscles, and visible signs of poor oxygenation. A decreased level of consciousness shows the brain isn’t getting enough oxygen or is affected by high carbon dioxide, reducing the patient’s ability to protect the airway and continue effective breathing. An inability to sustain respiratory effort means the diaphragm and chest muscles are tiring; the patient’s breaths become shallow, irregular, or stop altogether as ventilation fails. Cyanosis appears when oxygen saturation falls, signaling significant hypoxemia even though it can be a late sign. When all these are present or evolve together, they strongly indicate that respiratory arrest is near, and immediate airway support and ventilation are required.