You'll never be sued for good communication with the staff or your patients. Lacerations always cut through tendons, nerves and arteries until proven otherwise.
Headaches are subarchnoid hemorrages until proven otherwise.
Specialists are always awake at 3 am. Remember to call them for consultations . Patients who return to the ER after visiting earlier in the day usually have something seriously wrong. Always talk to everyone - nurses, paramedics, family. They're great information sources in the search for the truth about what occurred or why the patient's there.