An 18-year old boy was brought to ED by ambulance following a seizure at home. He witnessed another seizure en route the hospital. The condition and parameters reported at the ED were as follows: Examination Comatose  Poor respiration Pupils symmetrically dilated Blood sugar normal BP 70/40 mmHg ECG was acquired as indicated in the image.

What is the likely diagnosis? *This case is from the Editorial team of Docplexus and is meant for educative purposes only.