Yes, thank you. My Husband has just discovered a split root under a crown which due to the position and the fact that it cannot be easily accessed - he will require involved oral surgery. He is more than a little worried about the adrenalin used during this lengthly procedure. Due to his medication (age 67) this use of adrenalin could cause a 'bushfire' or a stroke/hypertension - what are his options, and would he be safe in ceasing any regularly taken meds in preparation or during the lead up to such a procedure? Georgia C. Feller