“…However, comparisons between studies are difficult due to the wide variability of drugs and techniques of administration as well as the reliability of the documentation. For example, hospitals provide the most accurate and complete records, but the distinction between anesthetic and surgical complications may not be clear.67 In addition, the validity of surveys that rely on the memories of practitioners for specific information concerning anesthetic/sedative techniques and patient responses should most certainly be questioned.67 M and M reviews support the association between greater risk of mortality with general anesthesia, particularly for cases treated in a hospital environment.67 68 Anesthetic mortality rates in the United Kingdom have been estimated to be 1:29,000 for both hospital in-patients and out-patients and 1: 248,000 for cases performed in the dental office and community clinics.68 Lower outpatient mortality rates in the range of 1: 500,000 to 1:1,000,000 have been reported for oral and maxillofacial surgeons surveyed in the United States.67 69 Anesthetic mortality rates have generally been shown to be higher in patients who are classified as ASA Class III and IV, but anesthetic deaths have also been reported in young, healthy patients.67-7071 The four most frequent causes of death due to general anesthesia relate to problems with airway management, ventilation, blood volume management, and arrhythmias.67 A strong association was found between the use of combination drugs and multiple routes of administration during a single sedation appointment and the occurrence of significant complications including death.67 71 In a more detailed report of 13 closed-claim cases, the main cause of morbid events was hypoxia secondary to airway obstruction or respiratory depression; all patients died, with the exception of one who suffered brain damage. The majority of these cases involved deep sedation/general anesthesia with methohexital and nitrous-oxide/ oxygen as primary agents.70 Many of the anestheticor sedation-related deaths occurred in dental offices that were either poorly equipped with physiologic monitoring devices, especially the pulse oxirneter, or failed to utilize those monitors that were present.7071 It should be noted that most of these dental offices would likely not meet current physiologic monitoring standards.…”