Biomedical subjects
T K Ong
Publications and source records attributed to T K Ong.
Variations in the postoperative management of free tissue transfers to the head and neck in the United Kingdom.
Reliable assessment of the perfusion of free tissue transfers has always been a challenge for reconstructive microsurgeons. The complexities of flap microcirculation are often difficult to assess despite all the subjective and objective examination techniques available today, particularly when the free tissue transfer is buried, and not visible for monitoring. We investigated the post-operative management of free tissue transfers to the head and neck in the United Kingdom. Selected results from our survey show that the majority of units performed between two and five free tissue transfers to the head and neck region per month (n=60, mean=4.13, range<1-12). Clinical tests were used to monitor the flaps post-operatively in all units questioned. Hand held doppler was the most commonly used adjunctive technique, being routinely used for post-operative monitoring by twenty six units, and available for use in eighteen other units with the most common indications for use were, slow capillary refill and pale colour. Frequency and location of monitoring post-operatively was highly variable. Nurses were responsible for the routine monitoring of flaps in almost every unit. Thirty four units (57%) had a written protocol in place governing the monitoring of free tissue transfers post-operatively. We note the wide variation in practice on a national level, and make certain recommendations.
The role of thoracic computed tomography in staging newly-diagnosed oral squamous cell carcinoma.
Patients who present with squamous cell carcinoma (SCC) in the head and neck have a serious risk of coincident thoracic malignancy. The aim of this study was to identify the incidence of thoracic malignancy in newly diagnosed, previously untreated, oral and oro-pharyngeal SCC, and to evaluate the role of thoracic computed tomography (CT) in its management. Of 116 consecutive patients who were identified prospectively 81(70%) had oral and 35 (30%) oropharyngeal SCC. Ten patients (9%) had suspicious thoracic CT findings. After investigation or follow up, four (3.5%) of these patients were shown to have coincident thoracic malignancies. This large prospective series of newly diagnosed oral and oropharyngeal SCC had a lower incidence of coincident thoracic malignancy than had previously been shown.
Update on dental graduates entering medicine 1986-1991.
In a previous publication we reviewed the future career plans of 169 dental graduates who entered medical school from 1986 to 1991 inclusive. The aim of the present study was to find out what happened to this group after qualification from medical school. The 169 individuals were traced and a questionnaire was sent to them by mail. A reminder was sent and some data for non-respondents were obtained from public sources such as registers and directories. In the original study, 120 of the 154 respondents (78%) intended to become oral and maxillofacial surgeons. We found in this follow up survey that the overall return rate to oral and maxillofacial surgery (OMFS) had dropped to 66%. For those not returning to the speciality, a wide range of alternative specialities had been chosen, with general medical practice (n=9) and oral medicine (n=8) being the most popular. Amongst those returning to OMFS, most undertook basic surgical training in general surgery and trauma. Two thirds of those eligible possessed the FRCS, with 43 (83%) holding the FRCS (Clinical Surgery in General) and six (12%) having the FRCS Ed (oral and maxillofacial surgery). Within the group, opinions were mixed about the changes caused by 'Hospital doctors: training for the future' (Calman Report) [Working Group on Specialist Medical Training. Hospital doctors: training for the future. London: Department of Health, 1993]. Concerns were voiced about the potential reduction in clinical experience, comparatively longer training for OMFS, and particularly the abrupt end of training with no protection whilst seeking a consultant appointment. Half thought that OMFS will become concentrated in supraregional centres, or head and neck units with related specialities.
Relocating the site of frozen sections--is there room for improvement?
INTRODUCTION: In an attempt to improve the marginal control of oropharyngeal carcinoma, some surgeons routinely perform frozen section analysis. Because current methods of relocating the site from which frozen section specimens are harvested can be haphazard, we studied the accuracy of a common technique used to localize specimens to the resected tumour bed. METHODS: One surgeon was asked to identify the sites of proposed sampling in 14 consecutive cases. After approximately 5 minutes, the same surgeon was asked to relocate each site. RESULTS: In all, 71 soft tissue points were identified. The mean error in relocating the sample site was 9 mm for those placed at mucosal margins and 12 mm for those placed deep to the tumor bed. The error exceeded 1 cm in 32% (23 of 71) of cases. CONCLUSION: These findings highlight the need to accurately locate the position of frozen sections if samples that subsequently prove positive are to used to greatest effect.
Surgical accuracy in Le Fort I maxillary osteotomies.
UNLABELLED: The surgical outcome of planned movements of Le Fort I osteotomies is dependent on the surgeon's ability to achieve such movements intraoperatively. Our aim was to assess the surgical accuracy achieved for 30 consecutive patients undergoing Le Fort I osteotomies treated by one maxillofacial surgeon and his team. METHOD: Intraoperative control of the mobilized maxilla vertically was achieved by a combination of a nasion screw as the external reference point and bony marks above and below the osteotomy cuts intraorally. Movements horizontally and transversely were controlled with occlusal wafers. The surgical accuracy of maxillary movements vertically and horizontally (anteroposteriorly) were assessed by standard lateral cephalometric tracings of radiographs taken within two weeks prior to operation and 48 hours afterwards. Audit targets were arbitrarily set to be satisfactory when the difference between planned movements and actual movements as measured on the cephalometric tracings were 2 mm or less. RESULTS: The mean (SD) difference from planned vertical movements of the anterior maxilla was 0.37 mm (SD 0.64) and horizontal movements 0.85 mm (SD 0.91). Ninety-seven percent (29/30) of anterior maxillary movements in the vertical dimension, 90% (27/30) of anterior maxillary movements in the horizontal dimension and 87% (26/30) of movements in both dimensions had a difference of 2 mm or less. These results were comparable with the reported 'gold standard'. CONCLUSION: Good surgical accuracy in positioning the mobilized maxilla in Le Fort I osteotomies can be achieved with the use of external and internal reference points.
Craniofacial trauma presenting at an adult accident and emergency department with an emphasis on soft tissue injuries.
We have retrospectively compiled data on 1000 consecutive adult patients presenting at an accident and emergency department (AED) with a total of 1048 soft tissue injuries and 151 fractures to the craniofacial region, with an emphasis on soft tissue injuries. Facial injuries were common in the AED, forming 7% of all attenders. The main cause of facial fractures was assaults (56%), whereas the largest proportion of soft tissue injuries was caused by falls/ accidents (44%). There was a left sided dominance in soft tissue injuries arising from assaults. However, when subdivided into type of soft tissue injuries, the left sided dominance was significant in contusions only, with virtually equal side distribution in open wounds. Almost half of the 458 open wounds which required treatment were in the upper third of the face. Most lacerations in the upper face can be managed by steristrips or glue but most lacerations in the lower third required suturing. 90% of these injuries were treated by AED personnel. Tertiary referrals were made in only 10% of these cases.
The role of thorax imaging in staging head and neck squamous cell carcinoma.
The overall survival rate for patients with head neck squamous cell carcinoma remains disappointingly static despite improved locoregional control. This has been attributed to the development of distant metastases and second primary malignancies in these patients, a large proportion of which occur in the thorax. We retrospectively analysed the incidence of thoracic malignancies in 138 patients presenting with newly diagnosed (n = 107) or recurrent (n = 31) cancer of the head and neck over a 4-year period. All 138 patients had undergone both computerised tomography of the thorax (CT) and conventional chest radiography within one month of presenting with biopsy proven squamous cell carcinoma. Seventeen percent of these were found to have simultaneous thoracic malignancies. CT thorax was more sensitive in detecting simultaneous thoracic malignancies compared with standard chest X-ray (24/138 versus 9/138, odds ratio of 3:1 in favour of CT). All thoracic malignancies detected by chest X-ray were also detected by CT thorax. Patients presenting with recurrent tumors were significantly more likely to have simultaneous thoracic malignancies than those with newly diagnosed cancer (11/31 versus 13/107, chi2 test with Yates correction, chi2 = 4.66, p = 0.03). The primary site (laryngeal, oral or pharyngeal) or presence of nodal disease did not have an effect on the incidence of simultaneous thoracic malignancies. The presence of distant metastases and second primary malignancies has major implications in the management and prognosis of patients presenting with head and neck squamous cell carcinoma, with a large proportion of such patients succumbing to their disease within one year of diagnosis. As CT scanning of the thorax was a more effective screening investigation than standard chest X-ray in the detection of simultaneous thoracic malignancy, we recommend it for use in the staging of patients presenting with cancer of the head and neck.
Survey of dental graduates entering medical schools and a comparison with previous surveys.
The 169 dental graduates known to have entered UK medical schools between 1986 and 1991 inclusive were sent a questionnaire requesting personal and professional information. A total of 154 graduates (91%) responded, 126 (82%) males and 28 (18%) females, all with a mean age of 27 years. Over the 6 years studied, both the average fees paid and the number of students paying fees increased. During the same period, the average grant received and number receiving grants both decreased. Of the 154 responding, 141 (92%) intended to pursue a career in oral and maxillofacial surgery at the time they entered medical school, and this had fallen to 120 (78%) by the time of the survey. An estimate of the number of those medical students who may return to the specialty was made based on previous surveys (range of 12-26 trainees/years).
A clinical and histopathological study of osteoarthrosis of the temporomandibular joint.
OBJECTIVES: The aims of this study were (i) to objectively assess the histopathological features in TMJ condylar head specimens to correlate the findings with clinical information obtained from pathology request forms and hospital notes (ii) to analyse the pre- and post operative investigation and management of patients with TMJ-OA. DESIGN: A retrospective histological analysis of 136 specimens using a semi-quantitative scoring system. SUBJECTS: 132 patients with TMJ-OA in Trent Hospital Region (mean age 34: range 14-71) provided 136 condylar heads. MAIN OUTCOME MEASURES: 11 histological parameters were assessed. The global scores obtained were compared with the clinical data. RESULTS: There was no clear correlation between histology and pre- and post-operative clinical data. 95% of patients were treated for at least 6 months before surgery and 94% had pain before surgery. Postoperatively, the success rate was 58% (35% painfree and 23% still in pain but better than before surgery). Non-surgical treatments were not used routinely after surgery. Only 62% of the patients were followed up for at least one year after surgery. 61% of the patients were reported to have macroscopic degenerative changes at surgery whilst all had microscopic OA. CONCLUSION: The mean age of patients presenting with TMJ-OA is younger (M = 31/F = 34) than in some studies while there is still a female preponderance for the disease. Tomograms and arthrograms appear to have a higher specificity than orthopantomograms for diagnosing gross degenerative change. There appears to be a need for a standardised management protocol.
Dental graduates reading medicine.
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Measles--an experience in Sandakan Hospital, Sabah, 1990.
A descriptive study of 143 cases of clinically diagnosed measles in patients under the age of 12 years admitted to the Duchess of Kent Hospital, Sandakan, Sabah, during the year 1990 was carried out. The median age of the patients was one year and 13.3% of the cases were between the ages of 6 and 9 months. The male to female ratio was 1.3:1. The majority of the cases (85.3%) were not immunised against measles while 60.0% of the cases were malnourished. Most of the cases (86.0%) had at least one complication with 32.9% of the cases having more than one complications. The main complications were pneumonia (74.1%) and diarrhea (38.5%). Other complications were convulsions, otitis media and corneal ulceration/scarring. A case of pneumonia with mediastinal emphysema and subcutaneous emphysema was noted. The case fatality rate was 1.4% while blindness was the long term morbidity in 1.4% of the cases. Measles remains an important cause of morbidity in children in Sabah.
A survey of British medical schools policies with regard to applications from dental graduates in 1992.
The admission officer of 28 medical schools in the UK were circulated with a questionnaire requesting details of their policies regarding applicants who are dental graduates. Replies were received from 27 schools (96.4%). There was a wide variation amongst the intake policies between the medical schools. The number of places available for dental graduates varied from none to four per year. The entry requirements for such applicants ranged from the BDS degree to Part II FDS. Most medical schools set the upper age limit for dental graduates entering medicine as 30 years. Up to 2 years exemption in the 5-year medical course may be available for some dental graduates but 17 medical schools do not offer any reduction in the duration of the course. Only eight of the medical schools liaised with an oral and maxillofacial surgeon in vetting the dentally qualified applicants. All the medical schools operated the fees remission scheme for the self-financed student. This survey should help the prospective candidate to shortlist suitable medical schools.
Ductal papilloma of the minor salivary gland.
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Solvent abuse. An anaesthetic management problem.
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Inhalation of a denture fragment complicating facial trauma.
A case of facial trauma is presented, which was complicated by a denture fragment lodged in the larynx. This potentially life threatening event caused minor symptoms only. Its diagnosis and management are reported.
Endometriosis in Asian women: a retrospective study.
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Static weight control in late pregnancy--a case control study.
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