Biomedical subjects

Graham Phillips

Publications and source records attributed to Graham Phillips.

4 recordsLinked to original sources

PubMed2006

An approach to the intercalibration of benthic ecological status assessment in the North Atlantic ecoregion, according to the European Water Framework Directive.

The European Water Framework Directive (WFD) establishes a framework for the protection and improvement of transitional and coastal waters; its final objective is to achieve at least 'good water status' for all waters, by 2015. The WFD requires Member States (MSs) to assess the Ecological Status (ES) of water bodies. This assessment will be based upon the status of the biological, hydromorphological and physico-chemical quality elements, by comparing data obtained from monitoring networks to reference (undisturbed) conditions, and then deriving an Ecological Quality Ratio (EQR). One of the biological quality elements to be considered is the benthic invertebrate component and some structural parameters (composition, diversity and disturbance-sensitive taxa) must be included in the ES assessment. Following these criteria, several approaches to benthic invertebrate assessment have been proposed by MSs. The WFD requires that these approaches are intercalibrated. This contribution describes the comparison of the different methodologies proposed by United Kingdom, Spain, Denmark and Norway. Results show a high consistency between the approaches, both with regard to determining the EQR and boundary settings for the ES.

Animals↗

PubMed2004

The eVALuate study: two parallel randomised trials, one comparing laparoscopic with abdominal hysterectomy, the other comparing laparoscopic with vaginal hysterectomy.

OBJECTIVE: To compare the effects of laparoscopic hysterectomy and abdominal hysterectomy in the abdominal trial, and laparoscopic hysterectomy and vaginal hysterectomy in the vaginal trial. DESIGN: Two parallel, multicentre, randomised trials. SETTING: 28 UK centres and two South African centres. PARTICIPANTS: 1380 women were recruited; 1346 had surgery; 937 were followed up at one year. Primary outcome Rate of major complications. RESULTS: In the abdominal trial laparoscopic hysterectomy was associated with a higher rate of major complications than abdominal hysterectomy (11.1% v 6.2%, P = 0.02; difference 4.9%, 95% confidence interval 0.9% to 9.1%) and the number needed to treat to harm was 20. Laparoscopic hysterectomy also took longer to perform (84 minutes v 50 minutes) but was less painful (visual analogue scale 3.51 v 3.88, P = 0.01) and resulted in a shorter stay in hospital after the operation (3 days v 4 days). Six weeks after the operation, laparoscopic hysterectomy was associated with less pain and better quality of life than abdominal hysterectomy (SF-12, body image scale, and sexual activity questionnaires). In the vaginal trial we found no evidence of a difference in major complication rates between laparoscopic hysterectomy and vaginal hysterectomy (9.8% v 9.5%, P = 0.92; difference 0.3%, -5.2% to 5.8%), and the number needed to treat to harm was 333. We found no evidence of other differences between laparoscopic hysterectomy and vaginal hysterectomy except that laparoscopic hysterectomy took longer to perform (72 minutes v 39 minutes) and was associated with a higher rate of detecting unexpected pathology (16.4% v 4.8%, P = < 0.01). However, this trial was underpowered. CONCLUSIONS: Laparoscopic hysterectomy was associated with a significantly higher rate of major complications than abdominal hysterectomy. It also took longer to perform but was associated with less pain, quicker recovery, and better short term quality of life. The trial comparing vaginal hysterectomy with laparoscopic hysterectomy was underpowered and is inconclusive on the rate of major complications; however, vaginal hysterectomy took less time.

Adult↗

PubMed2003

In-vitro and in-vivo histochemical and thermal studies using a thermal balloon endometrial ablation system for varying treatment times.

BACKGROUND: To assess the immediate zone of thermal necrosis (ZTN) using an enzyme histochemical staining technique and serosal temperatures for the Cavaterm endometrial balloon ablation system for different treatment times. METHODS: A thermal balloon ablation was performed initially post- (n = 6) and subsequently pre-hysterectomy (n = 15). Eight to 12 tissue blocks from each uterus were sectioned and stained using diaphorase respiratory enzyme techniques. Patients in the in-vivo group had temperature measurements taken from four serosal points, a myometrial gradient profile, the balloon surface and the endocervical canal. RESULTS: The serosal temperature sensors did not demonstrate any rise in temperature above 44.1 degrees C. The mean temperature at the anterior wall, posterior wall, fundus and cornual areas was 37.1 (SD 1.3), 36.8 (SD 1.0), 37.4 (SD 1.8) and 36.7 degrees C (SD 1.0), respectively. The immediate mean maximum ZTN was greatest for the 15-min treatment time (3.1 mm, SD 1.5) compared to the 10- and 7-min treatment times (3.0 mm, SD 1.4 and 2.2 mm, SD 0.7, respectively). The maximum ZTN recorded was 5.6 mm. No full thickness injuries were demonstrated either histochemically or suggested by the temperature studies. CONCLUSIONS: This study confirms that Cavaterm thermal balloon ablation produces a reproducible thermal injury without evidence of serosal heating. Results suggest that the treatment time could be reduced to 10-min with no detrimental effect on the clinical outcomes. This hypothesis is currently being evaluated by clinical trials.

Female↗

PubMed2003

A randomised controlled trial comparing the Cavaterm endometrial ablation system with the Nd:YAG laser for the treatment of dysfunctional uterine bleeding.

OBJECTIVE: To compare the effectiveness of the Cavaterm thermal balloon endometrial ablation system with the Nd:YAG laser for the treatment of dysfunctional uterine bleeding. DESIGN: Randomised controlled trial. SETTING: Minimal access gynaecological surgery unit in a district general hospital. POPULATION: Seventy-two women with dysfunctional uterine bleeding requesting conservative surgical management of their condition. METHODS: Women with a normal endometrial biopsy and normal uterine cavity were randomly allocated to endometrial ablation by Cavaterm or Nd:YAG laser. Patients completed pre-operative and 6- and 12-month post-operative questionnaires assessing menstrual symptoms, quality of life, sexual activity and procedural satisfaction and acceptability. All patients received a single dose of gonadotropin-releasing hormone analogue one month pre-operatively and kept blinded to the procedure performed until after the 6-month assessment. MAIN OUTCOME MEASURES: The primary outcome measure was amenorrhoea rate. Secondary outcomes were effect on blood loss, quality of life, sexual activity, patient satisfaction and procedure acceptability. RESULTS: Seventy-two women were randomised. Amenorrhoea rates at 12 months in the Cavaterm and endometrial laser ablation groups were 29% vs 39% (P = 0.286), with combined amenorrhoea and hypomenorrhoea rates of 73% vs 69%, respectively. At 12 months, repeat surgery rates were higher in the endometrial laser ablation group (15% vs 12%, P = 0.395). Cavaterm was an acceptable procedure and 93% of patients satisfied or very satisfied at 12 months (95% endometrial laser ablation). Both treatments were associated with an increase from baseline in the SF-12 physical score (Cavaterm mean difference -3.9, 95% CI -7.9, 0.2, ns; endometrial laser ablation mean difference -5.1, 95% CI -9.5, -0.7, P = 0.003) and mental health score (Cavaterm mean difference -5.6, 95% CI -9.9, -1.3, P = 0.001; endometrial laser ablation mean difference -5.9, 95% CI -11.7, -0.2, P = 0.04). Patient's own assessment of health (EQ-5D VAS) improved from baseline in both groups (Cavaterm mean difference -7.6, 95% CI -13.9, -1.3, P = 0.02; endometrial laser ablation mean difference -5.4, 95% CI -14.9, 4.2, ns). EQ-5D index scores also improved (Cavaterm mean difference -0.06, 95% CI -0.2, 0.005, ns; endometrial laser ablation mean difference -0.17, 95% CI -0.3, -0.02, P = 0.02). There were no major complications in either group. CONCLUSIONS: The results with the Cavaterm thermal balloon endometrial ablation system are as good as those obtained with the Nd:YAG laser when used for the treatment of dysfunctional uterine bleeding in the short term. It results in a significant reduction in menstrual blood loss, patient satisfaction and improvement in patient quality of life. Larger studies with longer follow up are required to determine its place in the modern treatment of dysfunctional uterine bleeding.

Adult↗