Answer:

Information that is helpful at the beginning of a call is a short synopsis of why the caller is calling and a description of the patient (i.e., is the call about a patient who is having a suspected MH event intraoperatively?). Also helpful:

1. anesthetic agents administered (especially any triggering agents); 
2. vital signs, temp, ETCO2; 
3. lab results and labs that are pending (especially ABG, K, and CK); 
4. whether dantrolene has been given and the dosage; 
5. whether or not an urinary catheter is in place and the color and quantity of urine output.