ABSTRACT
The aim of this paper was to study the incidence and causes of facial injuries occurring in conjunction with major trauma, and to examine the role of the maxillofacial surgeon in the management of severely injured patients. A prospective study was undertaken of 1088 patients seen in 16 hospitals over a 1-year period. A total of 161 (15%) patients sustained facial injuries. Of these, 33% died at the scene of the incident and 21% died in hospital. There was poor resuscitation in 32% of patients, and a total of 32 injuries were missed in 19 patients. The involvement of the maxillofacial surgeon in the management of severely injured patients is examined. Our findings emphasize the need for early referral to the maxillofacial surgeon. It is concluded that maxillofacial surgery should be an on-site speciality, closely associated with the neurosurgical centre.
Subject(s)
Maxillofacial Injuries/epidemiology , Multiple Trauma/epidemiology , Adolescent , Adult , Aged , Aged, 80 and over , Child , Child, Preschool , England/epidemiology , Facial Injuries/epidemiology , Facial Injuries/mortality , Female , Hospital Mortality , Humans , Incidence , Infant , Male , Maxillofacial Injuries/mortality , Middle Aged , Multiple Trauma/mortality , Patient Care Team , Prospective Studies , Resuscitation/statistics & numerical data , Surgery, Oral , Survival Rate , Wales/epidemiologyABSTRACT
Several studies have compared the frequency selectivity of waves I and V of the auditory brainstem response (ABR) in humans, however little is known about the frequency selectivity of the middle latency response (MLR). Simultaneous recordings of ABRs and MLRs to 60 dB peSPL 2000-Hz probe tones were obtained in the presence of 0.5, 1.0, 1.41, 2.0, 2.83 and 4.0 kHz maskers presented at 40, 60, and 80 dB SPL. ABR/MLR iso-intensity masking profiles showing the percentage of the unmasked amplitudes as a function of frequency were constructed for ABR peak V-Vn and MLR peaks Na-Pa and Nb-Pb at each masker intensity. No significant differences were found between the frequency selectivity of the ABR and MLR, and the effects of masking on the amplitudes of these responses were similar. These results are consistent with the suggestion that frequency tuning is similar up to the level of the primary auditory cortex.
