Laryngospasm
Caused by...
Effects:
The resultant hypoxia (low oxygen) and hypercapnia (high CO2) produces an increased respiratory effort, with noisier breathing.

Violent coughing or breath holding indicates airway obstruction, which requires suction. At induction: laryngospasm breaks up with deeper anaesthesia. A forceful cough may dislodge foreign material.
Treatment at reversal...

Youtube