• Poorly controlled diabetes mellitus
• Expected significant blood loss or postoperative pain
• History of substance abuse
• Seizure disorder
• Susceptibility to malignant hyperthermia
• Potential difficult airway
  Morbid obesity
  Obstructive sleep apnea syndrome
• NPO <8 hours
• No escort
• Previous adverse outcome from anesthesia
• Significant drug allergies
• Pulmonary aspiration risk

NPO = nil per os.