Here is the direct link to the awesome post, “Massive Hemorrhage Post-Tonsillectomy“, from Dr. Morganstern’s First10EM Resuscitation Plans (there are currently 64 posts [Resuscitation Plans] in this awesome resource).
Please see Additional Resources below for five more useful references.
(1) Post-Tonsillectomy Hemorrhage from the outstanding Pediatric EM Morsels BY DR SEAN FOX · PUBLISHED AUGUST 17, 2012 · UPDATED JULY 23, 2016. It covers what to do for the patient with massive post op tonsillectomy hemorrhage.
(3) Recurrent Post Tonsillectomy Secondary Hemorrhage in Patients with Factor XIII Deficiency: A Case Series and Review of Literature [PubMed Abstract] [Full Text HTML] [Full Text PDF]. Am J Case Rep. 2016; 17: 850–854.