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Biomedical subjects

M N Vipond

Publications and source records attributed to M N Vipond.

At least 19 recordsLinked to original sources
PubMed1992

The selective use of fine catheter peritoneal cytology and laparoscopy reduces the unnecessary appendicectomy rate.

The effect of a management protocol incorporating the selective use of fine catheter peritoneal cytology (FCPC) and laparoscopy on the unnecessary appendicectomy rate was studied in adult patients (> or = 16 years) treated at one district general hospital over an 11-month period. Appendicectomy was performed on 62 adult patients managed according to this protocol, six (10%) of whom had a histologically normal appendix and no other acute condition requiring surgery. A further 57 patients underwent appendicectomy after standard clinical assessment and investigation without the use of FCPC or laparoscopy. Nineteen (33%) of these patients had a histologically normal appendix removed, with no other acute condition requiring surgical treatment. The selective use of FCPC and laparoscopy significantly reduced the unnecessary appendicectomy rate from 33% to 10% (chi 2 = 10.0, P < 0.005). The more widespread use of these techniques in patients with suspected appendicitis is therefore recommended.

Abdomen, Acute↗
PubMed1991

Role of fine catheter peritoneal cytology and laparoscopy in the management of acute abdominal pain.

Laparoscopy and fine catheter peritoneal cytology (FCPC) have been advocated as aids in the assessment of acute abdominal pain. In all, 411 patients admitted to a district general hospital during a 10-month period were managed using a standard protocol incorporating these techniques. After initial assessment by a surgical registrar, 151 patients were excluded from further progress through the protocol (age less than 16 years, definite diagnosis made or contraindication to FCPC. The remaining 260 patients were placed in one of four management groups: (A) urgent operation (23 patients); (B) 'look and see' (40 patients); (C) 'wait and see' (59 patients); (D) urgent operation not indicated (138 patients). Eighty-eight of 99 patients (88 per cent) in groups B and C, where the need for operation was uncertain, underwent successful FCPC and 39 patients (39 per cent) underwent laparoscopy. In these patients the initial registrar management decision proved to be incorrect in 33 cases (33 per cent), but by following the protocol the number of management errors actually made was reduced to 13 (13 per cent, P less than 0.001). This would have been reduced to 8 per cent if the protocol had not been violated in five patients. This study demonstrates the effectiveness of a protocol using FCPC and laparoscopy to improve the management of patients with acute abdominal pain.

Abdomen, Acute↗
PubMed1991

Surgery in HIV-positive and AIDS patients: indications and outcome.

We have reviewed the indications for and outcome of surgery in 147 patients who were seropositive for human immunodeficiency virus (HIV), 100 of whom have developed acquired immunodeficiency syndrome (AIDS). There were 256 operations; the commonest indications were anorectal conditions (34%), central venous access (21%), lymph node and soft tissue biopsy (15%) and an important minority underwent laparotomy (4%). Complications occurred in 20% of operations and repeat procedures were required in 35 patients. Both were of equal frequency in the HIV and AIDS populations. Most operations were therefore minor, and achieved satisfactory results with an acceptable morbidity. The possibility of HIV-related infection or malignancy affected the diagnostic and therapeutic approach, particularly in those considered for anorectal surgery or laparotomy. With increasing numbers of HIV-infected patients, knowledge of the types of surgery required and the likely outcome is important to enable provision of a safe and effective surgical service.

Adolescent↗
PubMed1991

Subcuticular Prolene or PDS for skin closure?

One hundred patients undergoing abdominal surgery were randomly allocated to have their skin wound closed by either polypropylene (Prolene) or polydioxanone (PDS) by the subcuticular method. Ninety-one patients completed the study and were assessed at discharge and again 3 months later for wound complications and cosmetic result. No statistically significant differences were found between the two sutures; overall wound infection rate was 5.5% and cosmetic result was equally acceptable for the two suture materials. This study indicates that an absorbable subcuticular suture may be safely used in all classes of wound.

Abdomen↗
PubMed1990

Peritoneal fibrinolytic activity and intra-abdominal adhesions.

The mechanisms leading to reduction of peritoneal fibrinolytic activity in conditions that are associated with the formation of intra-abdominal adhesions were studied. Tissue plasminogen activator was found, by antibody inhibition techniques, to be the activator of fibrinolysis in homogenates of control peritoneum (n = 6). Homogenates of control (n = 10) and inflamed peritoneum (n = 10) were analysed. Plasminogen activating activity was much lower in inflamed peritoneum (median 0.07 IU/cm2) than in control tissue (median 12.0 IU/cm2) (p less than 0.001). Levels of tissue plasminogen activator and alpha 2-antiplasmin were similar in both control and inflamed tissue. Plasminogen activator inhibitor-1, not detectable in control peritoneum, was present in inflamed tissue and might be the reason for the reduction in functional fibrinolytic activity.

Abdomen↗
PubMed1990

Modern aids to clinical decision-making in the acute abdomen.

Acute abdominal pain continues to provide not only a large workload for the general surgeon but also many diagnostic and management problems. Many different techniques have been introduced over the past two decades to help in the management of the acute abdomen and this review considers their relative claims to become incorporated into the process of clinical decision-making. The evidence in support of formally structured patient interview pathways with or without computer-aided diagnostic programs is now overwhelming and should become routine. Both laparoscopy and peritoneal cytology have an important role to play in the management of patients in whom the decision to operate is in doubt, and a combination of the two would be complementary. Ultrasonography has become increasingly popular for investigating the acute abdomen, and results from specialist centres are impressive. However, the problems of operator variation and the difficulties in providing a 24-h service will probably prevent it from becoming a first-line investigation in most hospitals. Although plain radiography has been available for many years, its routine use in the management of the acute abdomen remains controversial. Recent studies have confirmed that contrast radiography is an important adjunct to decision-making, particularly in the management of large bowel obstruction, and there is increasing evidence to support its use in suspected small bowel obstruction, perforated peptic ulcer and acute diverticular disease.

Abdomen, Acute↗
PubMed1990

Evaluation of fine catheter aspiration cytology of the peritoneum as an adjunct to decision making in the acute abdomen.

Fine catheter aspiration cytology of the peritoneal cavity was performed successfully in 61 patients admitted with acute abdominal pain. Aspirates were examined microscopically and the percentage of neutrophils in the specimen counted. In patients in whom the clinical need for operation was certain (n = 25) all patients required surgery and the peritoneal neutrophil count was greater than 50 per cent. In patients in whom the clinical need for operation was uncertain (n = 36) 19 patients required operation: the peritoneal neutrophil count was greater than 50 per cent in 18 and in one patient with ectopic pregnancy fresh blood was aspirated. Of the 17 patients not requiring operation the peritoneal neutrophil count was less than 10 per cent in 15 and greater than 50 per cent in two patients (both had acute pelvic inflammatory disease). This study confirms peritoneal cytology as a useful adjunct to decision making in those patients with acute abdominal pain in whom the decision to operate is in doubt.

Abdomen, Acute↗
PubMed1990

Experimental evidence to support the use of interposition vein collars/patches in distal PTFE anastomoses.

We have conducted three in vitro experiments (using cadaver internal mammary artery as a model for crural artery), which establish the advantage of the Miller collar and Taylor patch over direct PTFE-artery anastomoses: (1) A new method of simultaneously measuring longitudinal and circumferential elasticity in human saphenous vein (n = 16) has demonstrated the latter to be anisotropic (i.e.: greater longitudinal than transverse compliance, P less than 0.002). This suggests that benefit may be gained by aligning the saphenous vein's longitudinal axis with that of the arteriotomy--a feature of both vein interposition anastomoses. (2) We have compared maximal pulsatile and constant flow across each type of anastomosis (n = 10 of each) using a flow model incorporating standard pressure, viscosity, graft and outflow vessel length, and anastomotic angle. This experiment has demonstrated loss of anastomotic reliability only in direct PTFE-artery anastomoses (i.e. no correlation between flow and vessel diameter, r = 0.04). (3) Casts of the internal anatomy of the anastomoses (n = 10 of each) have demonstrated a greater degree of oval distortion of the toe of the outflow vessel of direct PTFE-artery anastomoses than either of the other techniques (P less than 0.01). This experimental evidence suggests that both of these vein interposition techniques optimise the mechanical properties of saphenous vein and protect small arteries from anastomotic distortion. These benefits do not occur with direct PTFE-artery anastomoses.

Anastomosis, Surgical↗
PubMed1990

Questionnaire identification of surgical patients at risk of HIV infection.

The prevalence of human immunodeficiency virus (HIV) infection is increasing. Risks of hospital transmission, though small, will consequently also increase. Precautions taken during invasive procedures, particularly surgery, and in the handling of specimens from patients diminish this risk. As HIV antibody screening is not permissible, we have assessed the possible efficacy of a routine questionnaire to identify high-risk groups. Of 525 questionnaires given to routine surgical patients, 506 (96%) were completed. Twenty-eight (5.5%) indicated that they were in a high-risk group. High-risk patients were more likely to present with anorectal disease, to be male and to be young compared with patients from the remainder of the sample. The questionnaire was acceptable to 97% of patients although to a significantly smaller number (82%) of high-risk patients. Routine HIV antibody testing would be acceptable to 88% of low-risk patients but to only 60% of high-risk patients. Questionnaire assessment is an acceptable and perhaps more reliable method of assessing HIV risk status than the other currently available options. It has to be accepted that it will never result in complete identification but we recommend this method as one approach to the problem faced by the surgical team.

Adolescent↗
PubMed1990

The response of general surgeons to HIV in England and Wales.

The prevalence of HIV in the UK has been estimated to be 1 in 1000 of the population. Surgeons are at particular risk of occupational transmission from infected blood. To determine the effect of HIV on surgical practice we sent a questionnaire to 681 general surgeons in England and Wales; 450 replied (66%). Of those who replied, 42% were aware of having operated on an HIV-infected patient at least once, and 28 had recognised self-injury in such circumstances; 79% attempted to identify HIV-infected patients preoperatively, though many depended on clinical suspicion alone, which is known to be unreliable. Of those who had operated on a seropositive patient, 90% reported taking special precautions to avoid blood contact and minimise sharps injuries for such cases. The majority wore double gloves, eye protection and fluid-resistant gowns, but only a minority reported changes in surgical technique. Half had made no changes in procedures or technique when operating on patients not identified as being at risk of HIV infection. Among a wide variety of comments made by the surgeons, the commonest was a call for facilitation of HIV testing prior to surgery. This survey indicates that surgery on HIV-infected patients is not restricted to specialist centres. We review the means of identifying HIV-infected patients, the precautions that can be taken to minimise HIV transmission during surgery, and the possible influences of HIV status on surgical decisions. We conclude that the prevalence of HIV among surgical patients is being underestimated at present, that several simple changes in surgical technique should be adopted generally, and that there is limited value in preoperative HIV testing, though this may become more useful in the foreseeable future.

Accidents, Occupational↗
PubMed1990

Three new primary pelvic carcinomas in a patient following radiotherapy for carcinoma of the cervix. Case report.

A 67-year-old woman developed three separate pelvic malignancies forty years after undergoing radiotherapy for a squamous cell carcinoma of the cervix. Although previous exposure to ionising radiation is associated with certain malignancies, review of the literature indicates that there is no strong evidence to support such an association with urothelial or colorectal malignancy.

Adenocarcinoma↗