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Biomedical subjects

S N Lloyd

Publications and source records attributed to S N Lloyd.

At least 19 recordsLinked to original sources
PubMed2005

Patients at high risk for upper tract urothelial cancer: evaluation of hydronephrosis using high resolution magnetic resonance urography.

PURPOSE: We assessed the potential of magnetic resonance urography (MRU) in the evaluation of hydronephrosis not explained by standard investigation in patients at high risk for upper tract urothelial cancer. MATERIALS AND METHODS: A total of 23 consecutive patients in a specialist urological unit with unexplained hydronephrosis prospectively underwent MRU which comprised overview heavily T2-weighted MR urographic images followed by focused high resolution turbo spin echo T2-weighted sequences obtained in an axial and coronal oblique plane through the level of urinary obstruction. All were at high risk for urothelial cancer and had either contraindications to or problems with standard investigations including poor contrast excretion due to obstruction or renal failure, failed ureteral cannulation or contrast allergy. Clinical events and imaging followup, subsequent endoscopic/surgical findings and histopathology validated MR findings. RESULTS: In 23 patients with a high clinical suspicion of upper tract transitional cell tumors (TCC), 8 ureteral and 5 renal pelvic TCCs (2 bilateral) were diagnosed by MR, and confirmed histologically. In a further 5 patients benign causes for the hydronephrosis were found. No intrinsic or extrinsic pathology was demonstrable in 5 patients whose imaging findings were stable during 1 year of followup. CONCLUSIONS: MRU is a valuable noninvasive investigation for evaluating hydronephrosis in this group of patients with suspected urothelial cancer in which routine investigation had failed to provide clinically important information. Focused high resolution T2-weighted images were reliable in the diagnosis of ureteral and renal pelvic TCCs, and were valuable in excluding these and other mass lesions as the cause of hydronephrosis.

Aged↗
PubMed2004

Evaluation of painful hydronephrosis in pregnancy: magnetic resonance urographic patterns in physiological dilatation versus calculous obstruction.

PURPOSE: We evaluated magnetic resonance urography (MRU) appearances in symptomatic hydronephrosis in pregnancy and compared urographic patterns in physiological and calculous disease. MATERIALS AND METHODS: A total of 24 consecutive pregnant women with symptomatic hydronephrosis underwent MRU, comprising an overview fast T2-weighted examination of the abdomen and pelvis, and thick slab, heavily T2-weighted MRU images, followed by focused, high resolution T2-weighted sequences obtained in an axial and coronal oblique plane through the level of ureteral caliber change. RESULTS: Of these 24 pregnant women 15 were found to have physiological hydronephrosis, 7 had calculous disease and 2 had preexisting urinary anomalies. MRU findings in physiological hydronephrosis cases were extrinsic compression of the middle third of the ureter, no filling defect and a collapsed ureter below it. Obstruction by ureteral calculi was seen at points of ureteral narrowing in the ureter, that is at the vesicoureteral junction in 2 cases, in the compressed mid ureter in 3 and at the pelviureteral junction in 1. Nonobstructive renal calculi were seen in another patient. Calculi presented throughout pregnancy but physiological hydronephrosis presented only in the late second and third trimesters. With distal calculi the MRU appearance was the double kink sign with constriction at the pelvic brim and the vesicoureteral junction with a standing column of urine in the pelvic ureter. There was renal edema and perirenal extravasation. Small calculi were only identified using high resolution T2-weighted magnetic resonance imaging. CONCLUSIONS: MRU is a valuable and well tolerated investigation for evaluating painful hydronephrosis in pregnancy. There are characteristic and differing urographic appearances in physiological and calculous obstruction.

Adolescent↗
PubMed2003

The impact of the Dornier Compact Delta lithotriptor on the management of primary ureteric calculi.

OBJECTIVE: To assess the effectiveness of the Dornier Compact Delta lithotriptor on the management of in situ primary ureteric stones. PATIENTS AND METHODS: 137 patients with primary ureteric stones were treated at a tertiary urological center using the latest Dornier Compact Delta lithotriptor between January 1999 and January 2002. Effectiveness of lithotripsy, retreatment rate, reasons for failure and complications were assessed. RESULTS: 102 males and 35 females with primary ureteric stones underwent ESWL treatment at our center. 74 patients had upper, 37 middle and 26 lower ureteric locations respectively. Mean stone size was 10 mm (range 8-25 mm). Mean numbers of sessions required were 1.8 (range 1-3). The retreatment rate was 33% in upper ureteric, 29% in mid ureteric and 26% in lower ureteric locations respectively. Complete clearance rate at 3 months was 86% for upper ureteric, 79% for mid ureteric and 79% for lower ureteric. 29 patients had auxiliary treatment in the form of double J ureteric stenting or percutaneous nephrostomies. 26 patients failed treatment and underwent ureteroscopic or ante grade percutaneous removal. Stone size was the only significant factor correlating with failure. The mean size of stones in the successful group was 12 mm as compared to 17 mm in failure group. The likelihood of success following a failed second session (no disintegration or disintegration with fragments more than 6 mm) of treatment was 13.4%. Complications including, steinstrasse, colic, UTI and petechial haemorrhage were seen in 35 patients. One patient developed pyonephrosis and subsequently required nephrectomy. CONCLUSION: An electromagnetic shock wave lithotriptor using the EMSE-150 shock wave emitter is an effective in situ treatment of primary ureteric stones. Patients with large stone size are likely to have a higher retreatment rate, more auxiliary procedures and complications. Having a failed second treatment session, the likelihood of a successful outcome after third session of ESWL is poor.

Adolescent↗
PubMed2001

The efficacy of a range of contact media as coupling agents in extracorporeal shockwave lithotripsy.

OBJECTIVE: To determine if the nature of the coupling agent normally used between the lithotripter and the patient affects the stone fragmentation rate during extracorporeal shock wave lithotripsy. MATERIALS AND METHODS: A jig designed to hold 'phantom' 10-mm stones at the focal point was fixed against the shock wave delivery point of an electromagnetic lithotripter (Dornier Compact, Germany). A layer of either petroleum jelly (Vaseline, Cheeseborough-Ponds Ltd, London, UK) ultrasonography jelly, a eutectic mixture of local anaesthetic (EMLA) cream, Instillagel (Farco-Pharma, Cologne, Germany) or a commercial water-soluble lubricating jelly was placed between the jig and shockwave head, and the number of shock waves required to fragment the stones was recorded. RESULTS: Significantly more shock waves were required to fragment stones when petroleum jelly was used as the coupling agent than with all the other agents under test, whereas significantly fewer shock waves were required when using Instillagel or lubricating jelly than for all other agents. CONCLUSION: The coupling agent used in water-free lithotripsy can affect the stone fragmentation rate and should not be considered inert. Ultrasonography jelly is probably the optimum agent available for use as a lithotripsy coupling agent.

Emollients↗
PubMed2000

Early report: comparison of breath-hold MR excretory urography, Doppler ultrasound and isotope renography in evaluation of symptomatic hydronephrosis in pregnancy.

AIM: To compare assessment by MR excretory urography (MREU), Doppler ultrasound and isotope renography of women with symptomatic hydronephrosis in pregnancy and to define its cause. MATERIALS AND METHODS: Eleven women at 19-34 weeks of gestation were studied prospectively with gadolinium-enhanced breath-hold gradient echo MREU and transabdominal Doppler ultrasound compared with a 'gold standard' of isotope renography employing frusemide challenge. All studies were performed within 24 h, were reported independently in a blinded fashion and employed clearly defined criteria. Obstetric and infant outcomes were obtained. RESULTS: There were no adverse reactions to gadolinium administration in pregnancy and no adverse obstetric or infant outcomes. Three of the 11 women were unable to tolerate the complete MREU protocol. Ultrasound indices could not be used to predict ureteric obstruction as shown by isotope renography. MREU agreed with renographic findings in five of the six cases with obstruction and in two without obstruction. MREU directly demonstrated hydronephrosis to result from extrinsic compression of the ureter between the gravid uterus and iliopsoas muscle. CONCLUSION: MR excretory urography is a promising technique which affords equivalent functional and additional anatomical information to isotope renography. It is more accurate than Doppler ultrasound in the assessment of ureteric obstruction in pregnancy.Spencer, J. A. (2000). Clinical Radiology55, 446-453.

Contrast Media↗
PubMed1999

Changing trends in prostatic cancer.

OBJECTIVES: To examine the diagnosis and treatment of prostatic cancer in a population-based study, reporting incidence trends and survival, in the decade before the introduction of prostate-specific antigen (PSA) testing, and thus determine whether the overall incidence of prostatic cancer is increasing or not. PATIENTS AND METHODS: The study included all men registered as having prostatic cancer in the Yorkshire region between 1981 and 1990. The Northern and Yorkshire Cancer Registry and Information Service has an active registration policy and after notification, the information received is validated by histopathology reports and case-note review. Of the patients registered, 68% were over 70 years old at the time of diagnosis (mean age 74 years). Prostatic cancer was often diagnosed incidentally, after prostatectomy for presumed benign disease. Indications for treatment were not recorded, but most patients had treatment which was designed to control outlet bladder symptoms rather than with intent to cure cancer. RESULTS: In all, 8118 patients with prostatic cancer were registered, of whom 6587 had histological confirmation. There was a 30% increase in the age-standardized incidence of prostatic cancer during the study period (P<0.001). The mortality from prostatic cancer increased by 35% (P<0.001) and the percentage of patients known to have metastases at the time of presentation increased from 18% to 24%. These changes were seen in all age groups. The overall survival was 49% at 5 years and 34% at 10 years. CONCLUSIONS: There has been a real increase in the incidence of prostatic cancer which pre-dates the use of serum PSA testing. The percentage relative survival of patients with prostatic cancer in Yorkshire during the study period is similar to that seen in other parts of the UK, but compares badly with reported survival in other countries.

Adult↗
PubMed1999

Extra-anatomic stents in ureteric obstruction: experience and complications.

OBJECTIVE: To assess the role of extra-anatomic stents (EAS) as a means of urinary diversion in patients with ureteric obstruction secondary to malignancy. PATIENTS AND METHODS: The technique for inserting EAS in patients with ureteric obstruction was described previously; to date, 13 patients (seven women and six men, mean age 45.3 years, range 22-78) have been treated. All patients had ultrasonographic evidence of hydronephrosis and/or significant biochemical evidence of renal impairment. Patients had advanced malignancy and one patient an abdominal aortic aneurysm. RESULTS: Urinary diversion was successful in all patients; two survived for more than 1 year, with stent changes at 6-monthly intervals. In three patients the stents were replaced by percutaneous nephrostomies because of problems with leakage or infection. The remaining patients died with functioning EAS in situ. CONCLUSIONS: In patients with ureteric obstruction secondary to malignancy or medical conditions excluding them from more invasive surgery, EAS provide a further therapeutic option instead of a permanent nephrostomy, which has associated inherent problems. This technique is not without potential problems and careful selection of patients remains vital in this difficult area.

Adult↗
PubMed1999

How is follow-up after transurethral prostatectomy best performed?

OBJECTIVE: To evaluate the role of the nurse practitioner (NP) in screening patients for potential discharge after routine transurethral prostatectomy (TURP) or bladder neck incision (BNI) where, although urologists continue to follow such patients, the trend is away from clinic attendance. PATIENTS AND METHODS: The NP telephoned 70 patients 4 weeks after surgery; information about expected postoperative problems, change in symptoms and the need to visit their general practitioner (GP) was recorded. A doctor then saw all the patients in a clinic 3 months after TURP or BNI. RESULTS: Complete records were available for 66 patients (TURP 56, BNI 10). Four weeks after their operation, 39 (59%) patients still had one or more significant symptoms but only nine (23%) had consulted their GP. After a telephone interview the NP considered that 38 of the 66 patients were fit to be discharged. At the 3-month outpatient appointment, 37 of these 38 patients were subsequently discharged. Of the remaining 29 patients, 15 (seven with carcinoma of the prostate and eight with significant symptoms) were given follow-up appointments. CONCLUSIONS: The persistence of significant symptoms in 12% of patients 3 months after TURP justifies the follow-up of all patients. A telephone interview by the NP at one month is recommended. This could result in safe discharge of more than half the patients and allow follow-up of those who need specialist input.

Continuity of Patient Care↗
PubMed1998

Is the timing of post-vasectomy seminal analysis important?

OBJECTIVE: To review the practice in two hospitals with differing protocols in the timing of seminal analysis after vasectomy. PATIENTS AND METHODS: The results from 245 vasectomies carried out at Hospital A, where semen was assessed 3 months after vasectomy, were reviewed and compared with those from 100 consecutive vasectomies at Hospital B, where semen was assessed 6 months after vasectomy. The results of seminal analysis at Hospital A were also audited after changing to the 6-month protocol. The patients' preferences for the timing of seminal analysis were also obtained. RESULTS: Of the 245 patients at Hospital A, 58 (24%) failed to provide samples, leaving 187 (76%) for evaluation; 528 samples were examined (mean 2.8 per patient, range 1-13). The first sample was positive in 36 (19.3%) and the second positive in 10 (5.3%), the first being negative. Four (2%) patients had persistent spermatozoa at 6 months, one subsequently undergoing exploration. Thirty-one (17%) patients provided further samples despite providing two consecutive clear ones. At Hospital B, 24 (24%) patients failed to provide samples; 10 (13%) patients had persistent spermatozoa at 6 months and live spermatozoa were detected in one patient's samples. All eventually produced clear samples, with none requiring exploration. After changing the protocol, 87 vasectomies were performed, with 18 (21%) patients failing to provide samples; seven (10%) of the samples collected showed occasional nonmotile spermatozoa at 6 months in either the first, second or both samples, with all samples clear by 8 months after vasectomy. CONCLUSIONS: The complete disappearance of spermatozoa after vasectomy takes longer than is generally believed and we therefore suggest that given adequate counselling, seminal analysis 6 months after vasectomy is cost-effective and in the patient's interest.

Humans↗
PubMed1997

A multicentre prospective study of prostatic volume in asymptomatic men in various continents.

Objective: To compare prostatic volumes in asymptomatic Asian men with similar controls in Europe. Patients and methods: Six centres (Beijing, Hong Kong, Jinan, Lisbon, Palermo and Stirling) independently selected asymptomatic men aged 55 y or more for assessment of prostatic volume using transrectal ultrasound (total=320 men) between 1992 and 1993. Results: Prostatic volumes in asymptomatic men were greater in Beijing than Hong Kong, Stirling and Palermo (P<0.05) and were smaller in Stirling than Beijing and Jinan (P<0.05). Conclusions: These results suggest that men from Stirling are less likely to have large prostates, but there is no evidence that men from any of the six cities are more likely to have small prostates. This small series may suggest that benign prostatic hyperplasia (BPH) is as common in China as in European cities. The differences may be due to some cities (Beijing, Jinan and Lisbon) having a greater proportion of high values, perhaps suggesting looser selection criteria. This may indicate an abandonment of traditional Asian foods with their presumptive beneficial effect in favour of a Western dietary style.

Journal Article↗
PubMed1994

Predicted and actual change in serum PSA following prostatectomy for BPH.

OBJECTIVE: To determine the relationship between prostatic adenoma volume and serum prostate-specific antigen (PSA) levels in patients with benign prostatic hyperplasia (BPH), and to compare the predicted change in serum PSA following prostatectomy with the actual change observed. METHODS: Transrectal ultrasound (TRUS) estimation of prostatic adenoma (transition zone) and total gland volumes were calculated in 96 patients prior to prostatectomy. BPH was confirmed histologically following transurethral prostatectomy (in 86) and open prostatectomy (in 10). Serum PSA was measured preoperatively in all patients and post-operatively in 87 patients. RESULTS: Correlation coefficients of 0.607 and 0.614 were observed between PSA and adenoma and total gland volumes, respectively. The geometric mean ratio of PSA to adenoma volume was 0.120 micrograms/L/cc with 95% CI (0.104, 0.139) and to total gland volume was 0.068 micrograms/L/cc with 95% CI (0.058, 0.078). TRUS-determined adenoma and total gland volumes correlated well (r = 0.915), as did TRUS-determined adenoma volume and resected weight (r = 0.878). The mean ratio of change in PSA to resected weight was -0.096 micrograms/L/g with 95% CI (-0.128, -0.064). Neither total gland volume nor operation type affected the relationship between change in serum PSA and resected weight. CONCLUSIONS: The adenoma should be the main determinant of serum PSA levels in patients with BPH. TRUS adenoma volume measurement is therefore the most appropriate preoperative measure when one is interpreting elevated levels of serum PSA in men thought clinically to have BPH.

Aged↗
PubMed1993

Multiple transrectal ultrasound-guided prostatic biopsies--true morbidity and patient acceptance.

Transrectal ultrasound (TRUS) is becoming more widely used as a method of investigating prostatic disease. This study investigated the acceptance of this technique in 89 patients undergoing evaluation for suspected malignant disease. The true morbidity associated with TRUS and TRUS-guided biopsy was evaluated. Serious complications were rare, but minor complications were frequent. Careful counselling is recommended prior to the procedure in order to minimise the patients' anxiety and ensure that if complications do occur they are dealt with swiftly and appropriately.

Biopsy, Needle↗
PubMed1992

Effect of percutaneous nephrolithotomy on thermoregulation.

Hypothermia is a well recognised complication of open surgery. We had observed hypothermia, occasionally followed by rebound hyperthermia in the early post-operative period, in patients undergoing percutaneous nephrolithotomy, and therefore decided to monitor patients undergoing this procedure more closely. During a 12-month period, 32 patients were monitored during 38 percutaneous nephrolithotomies; 12 procedures were performed using irrigation fluid at room temperature (22 degrees C) and 26 with fluid warmed to 37 degrees C. Although no statistically significant differences between temperature changes were seen, the most profound temperature falls occurred in patients who received fluid at room temperature. The recovery ward staff observed improved post-operative recovery in patients who had received warmed fluid. Three of the 5 patients who underwent more than 1 percutaneous procedure received fluid at 22 degrees C and fluid at 37 degrees C on separate occasions. In each patient a more profound temperature fall occurred when the cold fluid was used. Only 1 patient, who received cold fluid, developed rebound hyperthermia in the early post-operative period. Warming of irrigation fluid and close monitoring of core temperature may prevent unnecessary morbidity in patients undergoing percutaneous nephrolithotomy.

Adult↗
PubMed1992

Chronic testicular pain following vasectomy.

The incidence of chronic testicular pain following vasectomy has not been previously assessed. We have carried out a survey by postal questionnaire and telephone interview of 172 patients 4 years after vasectomy to assess the incidence of chronic testicular pain. Significant early post-operative complications occurred in 6 patients (3.5%): 2 infection, 3 haematoma and 1 orchitis. Chronic testicular discomfort was present in 56 patients (33%), considered by 26 (15%) to be troublesome but not by the other 30 (17%). Testicular discomfort related to sexual intercourse occurred in 9 cases (5%). Of the 9 patients who had sought further medical help only 2 had had further surgery (1 an epididymectomy and 1 excision of a hydrocele). Only 3 patients regretted having had the vasectomy because of chronic pain. On ultrasound examination, epididymal cysts were a common finding on both asymptomatic and symptomatic patients following vasectomy. Prior to vasectomy, all patients should be counselled with regard to the risk of chronic testicular pain.

Adult↗
PubMed1992

Is there still a place for prolonged bladder distension?

Over a 2-year period, 31 patients underwent prolonged hydrostatic bladder distension for benign and malignant bladder disease in this unit. Of these, 29 patients had benign functional disorders or bladder contracture, and in 2 patients hydrodistension was performed for complications of treatment for bladder neoplasia. Of the 29 patients with benign disease, 6 observed marked improvement and 8 some improvement in their symptoms, and 12 received no benefit. Patients with detrusor hypersensitivity fared better than those with detrusor instability or interstitial cystitis. A patient with malignant bladder disease died soon after the procedure as a result of a myocardial infarction. Problems attributed to the hydrostatic balloon catheter were responsible for 2 failures. The regional anaesthetic technique failed to provide adequate anaesthesia for hydrodistension in 9 procedures and limited the duration to 2 h in 13 others. Following recall of the perished balloon catheters by the manufacturer, and the introduction of continuous spinal anaesthesia, the number of technical failures has been reduced. This technique still has an important role to play in the relief of severe symptoms unresponsive to medical treatment, but it is important that ideal conditions are provided for hydrodistension in order to ensure maximum success, particularly when the alternative is major surgery.

Adolescent↗
PubMed1992

Is indoramin an effective alternative to prostatectomy?

Alpha-1-adrenergic antagonists are recommended for symptomatic treatment of patients awaiting prostatic surgery. Their efficacy has been confirmed in placebo controlled clinical trials, but to date no comparison of their effects with the results of subsequent prostatectomy has been made. Fifty-five patients awaiting prostatectomy were assessed (by symptom scores and peak urinary flow rates) prior to treatment, on indoramin 20 mg bd, and 2 months following prostatectomy. Side effects while taking indoramin were experienced by 36% of patients. Despite an overall improvement in mean symptom scores, 26% of patients with obstructive and 30% of those with irritative symptoms who were assessed while taking indoramin failed to experience any improvement. Of the 31 patients assessed while on indoramin and again following surgery, prostatectomy produced a greater symptomatic relief than indoramin. The increase in peak flow rate following prostatectomy was 11.7 ml/s compared with 3.2 ml/s on indoramin. However, 5 patients preferred to continue taking indoramin rather than proceeding to surgery. Indoramin is no substitute for prostatectomy. Although some patients might benefit from treatment while awaiting surgery, significant side effects may severely restrict its use for this purpose. The response to indoramin cannot be used as an accurate predictor of response to prostatectomy.

Humans↗