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Biomedical subjects

N A Watkin

Publications and source records attributed to N A Watkin.

17 recordsLinked to original sources
PubMed2006

Squamous cell carcinoma of the penis in a patient with chronic isolated penile lymphoedema.

Squamous cell carcinoma arising in tissue affected by chronic lymphoedema is rare. We describe, to our knowledge, the first documented case of penile squamous cell carcinoma arising in a patient with a history of idiopathic chronic penile lymphoedema. Patients with chronic lymphoedema should be actively followed for possible malignant changes. We discuss the management and possible aetiology of this unusual case.

Adult↗
PubMed2004

What is important to patients receiving extracorporeal shock-wave lithotripsy for urinary tract calculi?

INTRODUCTION: Patients' experience and expectations are paramount in the current era of clinical governance. However, there is lack of published information on patients' expectations from extracorporeal shock-wave lithotripsy (ESWL) treatment for renal stone disease. We conducted a survey to quantify what aspects of ESWL are important purely from the patients' prospective. PATIENTS AND METHODS: Postal questionnaires were sent out to all patients who attended our unit for ESWL treatment for renal stone disease. The questionnaire referred to 15 aspects of ESWL treatment. Patients were asked to rate each aspect based on a numerical scale from 1 to 10 (1--least important; 10--most important). RESULTS: We posted 340 questionnaires and received 208 valid replies (61%). Stone clearance was statistically the most important aspect of treatment. Staff attitude and explanation of the procedure and outcomes were rated highly. To our surprise, pain control was rated only 8th. CONCLUSIONS: Patients' priorities may be different to ours. Surveys like this allow ones to put the appropriate 'weight' on the results of patient satisfaction surveys in order to allocate resources and improve service appropriately.

Health Surveys↗
PubMed2003

What to do if it gets 'bigger'.

The problems associated with intra-operative erections are discussed. Present theory is reviewed to allow a better understanding of the available treatment options.

Adrenergic alpha-Antagonists↗
PubMed2003

A prospective audit of the implementation of the 2-week rule for assessment of suspected urological cancers.

INTRODUCTION: All urology departments are under considerable pressure to comply with the UK Government's implementation of the 2-week rule for suspected cancer referrals. A prospective audit was planned to begin 6 months after introduction of cancer referral guidelines and a central data collection process, to investigate the local workload generated by these referrals, and compliance with the 2-week rule. METHODS: Data were collected prospectively over an 8-week period. All referral letters were examined by an independent urologist for any of the criteria defined by the regional tumour working group as suspicious of urological cancer. For suspected cancer referrals, the patient journey was followed to assess efficiency of the referral process. Results were compared with figures for '2-week rule' referrals for the Trust obtained from the UK Department of Health (DoH) website. RESULTS: In all, 234 GP referrals were reviewed, 82 fitting regional criteria for suspected cancer. Of these, (i) 13% were either marked urgent with a clear statement of 'cancer' or included a clear request to be seen within 2 weeks; (ii) 23% included no implication of cancer; (iii) 72% were seen in haematuria clinic, median time to clinic visit being 56.5 days, none complying with the 2-week rule; and (iv) of referrals not seen in haematuria clinic, median time to clinic was 21 days, with 34% compliance. With more stringent definitions of a cancer referral, DoH figures for the Trust recorded just 18 referrals over 3 months, with 89% compliance. DISCUSSION: GP referral letters meeting guidelines for suspected cancer often failed to imply or mention this. Compliance with the 2-week rule was poor, especially for the haematuria clinic. This is variably attributable to wording of GP letters, communication issues, and the sheer load of patients to be seen. CONCLUSION: DoH criteria for cancer referrals grossly underestimate the true magnitude of workload demanded of the service.

Ambulatory Care↗
PubMed2000

Morbidity and the impact on daily activities associated with catheter drainage after acute urinary retention.

OBJECTIVE: To evaluate the effect on quality of life of being discharged home with a catheter before definitive treatment in patients with acute urinary retention (AUR). PATIENTS AND METHODS: Patients attending the emergency department with AUR were assessed and discharged home with a catheter if they fulfilled predetermined criteria. They were admitted to the day-care unit for urological assessment and completed a disease-specific quality-of-life questionnaire. RESULTS: Of 101 patients presenting to the emergency department in AUR, 84 were sent home after catheterization (83%); 78 (93%) patients completed the questionnaire. The major side-effects reported were urinary leak (46%), mild haematuria (44%), urgency (42%), pain around the penis (42%), painful erection (31%) and catheter blockage (26%). Only 12% of patients felt having a catheter was very inconvenient and 93% would find it acceptable to have a catheter in future. CONCLUSION: A significant minority of patients discharged home with a catheter had side-effects related to their catheter but were not greatly inconvenienced, and their capacity to carry out normal daily activities was not impaired. The immediate discharge of patients in AUR and planned treatment will enable better use of inpatient urology resources.

Activities of Daily Living↗
PubMed1997

High-intensity focused ultrasound ablation of the kidney in a large animal model.

The purpose of this study was to establish the feasibility of noninvasive treatment of small renal tumors with high-intensity focused ultrasound (HIFU). A 1.69-MHz extracorporeal HIFU transducer of 150-mm focal length was used. In vitro experiments with excised porcine kidneys allowed determination of suitable exposure parameters to be tested in vivo. For short exposure times (< 2 seconds), the minimum energy required to produce acute thermal damage was 500 +/- 100 Wcm-2 per second. Porcine kidneys (N = 18) were treated in vivo at a depth of 40 mm from the skin surface, with acute damage detected in 13. Damage was macroscopically and histologically discrete and confined to the target area within the kidney. Skin induration was observed after treatment in nine cases, and there was one skin burn. Transducer developments to prevent this morbidity and to improve energy deposition within the target are discussed.

Animals↗
PubMed1996

The intensity dependence of the site of maximal energy deposition in focused ultrasound surgery.

The relationship between spatial peak intensity and the position of ultrasound induced tissue damage was studied in in vitro tissue models, using a 1.69 MHz spherical bowl transducer. The models corresponded to the transabdominal route to the bladder and prostate, which are potential target sites for focused ultrasound surgery. The results confirm that there is a relationship between lesion position and intensity, with lesions forming, under some exposure conditions, ahead of the geometric focus. Forward growth of lesions appears to be due to changes in the absorption characteristics of the tissue in the beam path. Using a computer model, we have demonstrated that the absorption coefficient of the tissue must increase significantly in front of the focus to enable lesions to form ahead of the predicted position. A possible mechanism for this is bubble formation as a result of acoustic cavitation. The effect of nonlinear propagation in the tissue, at the intensities studied, is shown to be relatively small.

Abdomen↗
PubMed1996

A feasibility study for the non-invasive treatment of superficial bladder tumours with focused ultrasound.

OBJECTIVE: To determine whether high-intensity focused ultrasound can be used to ablate bladder wall tissue using a transabdominal approach in a large animal model, and whether it can be developed as a non-invasive treatment for superficial bladder tumours. MATERIALS AND METHODS: The bladder wall of 25 large white pigs was treated with a 1.7 MHz extracorporeal focused-bowl ultrasonic transducer. Animals were killed either 2 h, 3 days or 4 weeks after treatment and the bladder wall examined macroscopically and histologically. RESULTS: Acute bladder wall damage was detected in 15 of 16 animals at 2 h and in all six animals examined after 3 days. Areas of healing were seen in 10 of 12 animals at 4 weeks. Histological analysis of the treated areas revealed that the urothelium was denuded within 2 h and was associated with an acute inflammatory response in the bladder wall. At 4 weeks, the urothelium had regenerated over a maturing scar. CONCLUSIONS: Focused ultrasound can be used successfully to destroy regions of the bladder wall in a large animal model in vivo.

Animals↗
PubMed1996

Is the conservative management of the acute scrotum justified on clinical grounds?

OBJECTIVE: To determine whether there is justification for a policy of conservative management of acute scrotal emergencies, based on the ability to exclude a twisted testicle or the assumption that there is a "missed torsion' when the duration of symptoms is prolonged. PATIENTS AND METHODS: The case notes of 209 consecutive emergency scrotal explorations, carried out in one district general hospital over a 7-year period, were reviewed. The decision to operate was based solely on a clinical diagnosis, with no information from additional radiological investigations. RESULTS: The commonest finding was testicular torsion (39.5%) with an orchidectomy rate of 22%. Only 5% of scrotal torsions occurred in patients < 12 years of age, whereas 26% occurred in those > 20 years of age. In five of 82 cases (6%) of confirmed testicular torsion, the surgeon did not consider this the most likely diagnosis. With a pain duration of < 16 h, 89% of testes were salvaged, but with pain for > 16 h this decreased to 25%. In three cases the testis was viable after pain had been present for > 24 h. CONCLUSION: In the absence of supportive radiological investigations, a small but significant number of twisted testes will be missed if conservative management is adopted.

Acute Disease↗
PubMed1994

Urethral catheterisation--is anybody listening?

All house officers perform male urethral catheterisation and although complications may occur awareness of the potential problems varies considerably. 43 house officers from 12 different medical schools were interviewed to determine the amount of training that they received regarding this procedure as students and during their first pre-registration post. The results suggest that there is no planned approach to teaching urethral catheterisation which would be in the interests of both junior doctors and patients alike.

Education, Medical↗