Ans. a. Dantrolene Sudden development of increased hea rate, arrhythmia, high fever, metabolic and respiratory acidosis on aerial blood gases and elevation of end tidal CO, in a child undergoing squint surgery is highly suggestive of malignant hypehermia. Dantrolene would be the first agent of choice in the management of malignant hypehermia. "Malignant Hypehermia: Dantrolene is the only drug effective in reversing the symptoms and preventing the episode.