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1.
Prog Urol ; 30(5): 232-251, 2020 Apr.
Article in English | MEDLINE | ID: mdl-32220571

ABSTRACT

INTRODUCTION: Our objective was to provide guidelines covering all aspects of intermittent catheterisation (intermittent self-catheterisation and third-party intermittent catheterisation). MATERIALS AND METHODS: A systematic review of the literature based on Pubmed, Embase, Google scholar was initiated in December 2014 and updated in April 2019. Given the lack of robust data and the numerous unresolved controversial issues, guidelines were established based on the formal consensus of experts from steering, scoring and review panels. RESULTS: This allowed the formulation of 78 guidelines, extending from guidelines on indications for intermittent catheterisation, modalities for training and implementation, choice of equipment, management of bacteriuria and urinary tract infections, to the implementation of intermittent catheterisation in paediatric, geriatric populations, benign prostatic hyperplasia patients and continent urinary diversion patients with a cutaneous reservoir as well as other complications. These guidelines are pertinent to both intermittent self-catheterisation and third-party intermittent catheterisation. CONCLUSION: These are the first comprehensive guidelines specifically aimed at intermittent catheterisation and extend to all aspects of intermittent catheterisation. They assist in the clinical decision-making process, specifically in relation to indications and modalities of intermittent catheterisation options. These guidelines are intended for urologists, gynaecologists, geriatricians, paediatricians, neurologists, physical and rehabilitation physicians, general practitioners and other health professionals including nurses, carers….


Subject(s)
Intermittent Urethral Catheterization/standards , Humans
2.
Spinal Cord ; 55(7): 629-643, 2017 Jul.
Article in English | MEDLINE | ID: mdl-28117329

ABSTRACT

STUDY DESIGN: Systematic review (Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA); http://www.prisma-statement.org). OBJECTIVES: Different types of catheters and techniques have been described in the past three decades to identify the best self-intermittent catheterization method. Our aim is to review systematically the literature on the most appropriate material and technique to perform self-intermittent catheterization in the adult neurogenic population. METHODS: A systematic review search was performed through PubMed/Medline, Embase and Cochrane Central Register of Controlled Trials (CENTRAL) databases to study all types of self-intermittent catheters, and analyzing their impact on urinary tract infections (UTIs), urethral trauma, cost-effectiveness, quality of life and patient's satisfaction. We used the following keywords: 'intermittent catheterization/catheterisation', 'neurogenic', 'urinary catheters for intermittent use' and 'urethral catheterization/catheterisation' published by November 2015. RESULTS: After screening 3768 articles, 31 were included in the final synthesis (level of evidence 1b to 2b). The 2188 trial participants were mainly spinal cord injury adults and women with multiple sclerosis. Hydrophilic-coated catheters tended to decrease the incidence of UTI as well as urethral trauma and improve patient's satisfaction when compared with non-hydrophilic-coated catheters. Similarly, prelubricated catheters were associated with better results in terms of patient satisfaction. Sterile technique seemed to decrease the incidence of recurrent UTI; however, these results are counter-balanced by significantly increasing cost compared with clean catheterization. CONCLUSIONS: The present review demonstrated advantages of hydrophilic-coated catheters in decreasing risk of UTI and urethral trauma as well as improving patient's satisfaction. Prelubricated catheters has been shown to be superior to conventional polyvinyl chloride catheters. Randomized controlled trials comparing hydrophilic and prelubricated catheters must be conducted to assess possible superiority and cost-effectiveness.


Subject(s)
Self-Management , Spinal Cord Injuries/complications , Urinary Catheterization , Urinary Catheters , Humans , Urinary Catheterization/adverse effects , Urinary Catheterization/methods , Urinary Catheters/adverse effects
3.
Neurourol Urodyn ; 35 Suppl 2: S8-24, 2016 Apr.
Article in English | MEDLINE | ID: mdl-27064055

ABSTRACT

PURPOSE: The AMS800™ device, by far the most frequently implanted artificial urinary sphincter (AUS) worldwide, is considered to be the "gold-standard" when male incontinence surgical treatment is contemplated. Despite 40 years of experience, it is still a specialized procedure with a number of challenges. Here, we present the recommendations issued from the AUS Consensus Group, regarding indications, management, and follow-up AMS800™ implantation or revision. MATERIALS AND METHODS: Under ICS auspices, an expert panel met on July 10, 2015 in Chicago, IL, USA in an attempt to reach a consensus on diverse issues related to the AMS800™ device. Participants were selected by the two co-chairs on the basis of their practice in a University hospital and their experience: number of implanted AUSs according to AMS (American Medical System Holdings Inc., Minnetonka, MN) records and/or major published articles. Topics listed were the result of a pre-meeting email brainstorming by all participants. The co-chairs distributed topics randomly to all participants, who then had to propose a statement on each topic for approval by the conference after a short evidence-based presentation, when possible. RESULTS: A total of 25 urologists were invited to participate, 19 able to attend the conference. The present recommendations, based on the most recent and relevant data available in literature as well as expert opinions, successively address multiple specific and problematic issues associated with the AMS800™ trough a eight-chapter structure: pre-operative assessment, pre operative challenges, implantation technique, post-operative care, trouble-shooting, outcomes, special populations, and the future of AUSs. CONCLUSION: These guidelines undoubtedly constitute a reference document, which will help urologists to carefully select patients and apply the most adapted management to implantation, follow-up and trouble-shooting of the AMS800™.


Subject(s)
Urinary Sphincter, Artificial , Guidelines as Topic , Humans , Male , Postoperative Care , Preoperative Care , Prostatectomy/adverse effects , Prosthesis Implantation , Treatment Outcome , Urinary Bladder Neck Obstruction/complications , Urinary Bladder Neck Obstruction/diagnosis , Urinary Incontinence/etiology , Urinary Incontinence/surgery , Urinary Sphincter, Artificial/trends
4.
Neurourol Urodyn ; 35(4): 437-43, 2016 Apr.
Article in English | MEDLINE | ID: mdl-26998767

ABSTRACT

PURPOSE: The AMS800™ device is considered to be the "gold-standard" when male incontinence surgical treatment is contemplated. Despite 40 years of experience, it is still a specialized procedure with a number of challenges. Here, we present the recommendations issued from the AUS Consensus Group, regarding indications, management and follow-up AMS800™ implantation or revision. MATERIALS AND METHODS: Under ICS auspices, an expert panel met on July 10, 2015 in Chicago, IL, USA in an attempt to reach a consensus on diverse issues related to the AMS800™ device. Participants were selected by the two co-chairs on the basis of their practice in a University hospital and their experience: number of implanted AUSs according to AMS (American Medical System Holdings Inc., Minnetonka, MN) records and/or major published articles. Topics listed were the result of a pre-meeting email brainstorming by all participants. The co-chairs distributed topics randomly to all participants, who then had to propose a statement on each topic for approval by the conference after a short evidence-based presentation, when possible. RESULTS: The present recommendations, based on the most recent and relevant data available in literature as well as expert opinions, successively address multiple specific and problematic issues associated with the AMS800™ trough a 6-chapter structure: pre-operative assessment, pre operative challenges, implantation technique, post-operative care, trouble-shooting, and special populations. CONCLUSION: These guidelines undoubtedly constitute a reference document, which will help urologists to carefully select patients and apply the most adapted management to implantation, follow-up and trouble-shooting of the AMS800™. Neurourol. Urodynam. 35:437-443, 2016. © 2016 Wiley Periodicals, Inc.


Subject(s)
Urinary Incontinence/surgery , Consensus , Humans , Male
5.
Prog Urol ; 24(8): 526-32, 2014 Jun.
Article in French | MEDLINE | ID: mdl-24875572

ABSTRACT

OBJECTIVE: To describe the socio-demographical aspects, etiologies and psychosocial consequences of urogenital fistula patients (UGF) in Burkina Faso (BF). PATIENTS AND METHODS: Descriptive study of a cohort of consecutive patients during a period of 18 months (December 1st 2010 to August 31st 2012) in three centers of treatment in BF. Each patient has had a standardized complete medical observation focused on sociodemographics, clinical finding, past medical history and etiologies of UGF. Some patients had an interview with a psychologist. RESULTS: One hundred and seventy patients with mean age 35 years (minimum: 16, maximum: 70) were enrolled during the study period. The majority of patients were housewives (90.5%, n=152) and illiterates (92.9%, n=158). Among the patients, 62.4% (n=106) lived in rural zones. Obstetrical fistula was the most common cause of UGF (87.6%, n=149) in our study and prolonged labor occurred in 93.3% (n=139) of cases with 17.5% (n=26) who delivered at home. The majority of our cases were vesico-vaginal fistula (70.6%, n=120). Fifty-five patients (32.4%) were divorced after the fistula. The sensation of humiliation and sadness were noted at all the patients who had a psychological evaluation and 87.5% (n=14) of them have had suicidal ideas. CONCLUSION: The UGF are frequent in Burkina Faso and obstetrical etiology is dominant. The physical and psychosocial repercussions are important for the women victims of this pathology. LEVEL OF EVIDENCE: 4.


Subject(s)
Urinary Fistula/epidemiology , Urinary Fistula/etiology , Vaginal Fistula/epidemiology , Vaginal Fistula/etiology , Adolescent , Adult , Aged , Burkina Faso/epidemiology , Cohort Studies , Divorce/statistics & numerical data , Female , Humans , Middle Aged , Obstetric Labor Complications/epidemiology , Pregnancy , Suicidal Ideation , Urinary Fistula/psychology , Vaginal Fistula/psychology , Young Adult
12.
Histopathology ; 53(2): 177-83, 2008 Aug.
Article in English | MEDLINE | ID: mdl-18752501

ABSTRACT

AIMS: Predicting prostatic cancer patients' outcome is a major objective for clinicians and patients. Several nomograms are currently implemented prior to treatment to help predict clinical and pathological outcome. The aim of this study was to investigate the prognostic significance of morphometric measurements of cancer on the needle biopsy specimen in relation to the final pathological stage or the biochemical failure status following radical prostatectomy, and to determine which measurement of tumour length in cases with discontinuous foci of cancer (DFC) is most reliably reflective of the pathological stage. METHODS AND RESULTS: Of the 100 patients included in this study, 34% had high-stage disease (pT >or= 3 and/or pN1) and 16% experienced biochemical recurrence. The analysis showed that fraction of positive cores, total percentage of cancer and both total and greatest millimetric cancer lengths were the variables most closely associated with pathological stage and biochemical failure status. CONCLUSIONS: This study confirms the prognostic value of recording tumour extent in prostatic needle biopsy reporting. However, the results are inconclusive in determining the best method to record tumour length in cores with DFC and larger studies are needed to answer this question fully.


Subject(s)
Biopsy, Needle , Prostatic Neoplasms/diagnosis , Prostatic Neoplasms/pathology , Aged , Biopsy, Needle/methods , Humans , Male , Middle Aged , Predictive Value of Tests , Prognosis , Prostate-Specific Antigen/metabolism , Prostatectomy , Prostatic Neoplasms/metabolism , Prostatic Neoplasms/surgery
13.
J Med Genet ; 44(10): 664-9, 2007 Oct.
Article in English | MEDLINE | ID: mdl-17545557

ABSTRACT

BACKGROUND: Mitochondrial DNA (mtDNA) mutations cause a wide range of serious genetic diseases with maternal inheritance. Because of the high transmission risk and the absence of therapy in these disorders, at-risk couples often ask for prenatal diagnosis (PND). However, because heteroplasmy load (coexistence of mutant and wild-type mtDNA) may vary among tissues and with time, the possibility that a single fetal sample may not reflect the whole neonate impedes prenatal diagnosis of mtDNA diseases. METHODS: We performed 13 prenatal diagnoses for the NARP (neurogenic weakness, ataxia, retinitis pigmentosa) m.8993T-->G mtDNA mutation (p.Leu156Arg) in the ATP synthase subunit 6 gene. Analyses were performed on chorionic villous (CVS) and/or amniocyte samples carried out at various stages of pregnancy, using a method enabling quantification of low DNA amounts. RESULTS: Maternal mutant loads ranged from 0 to 75% in blood and had no predictive value for the fetus status, except for women with no detectable mutant DNA, whose fetuses were consistently mutation-free. In 8/13 PND, mutant load was <30%. These children are healthy at 2-7 years of age. In 5/13 PND, mutant load ranged from 65 to 100%, and parents preferred to terminate the pregnancies (15-22 weeks of gestation). Single-cell analysis of 20 trophoblastic cells and 21 amniocytes isolated from two affected fetuses found an average mutant load close to the overall CVS and amniocyte mutant load, despite striking intercellular variation. The m.8993T-->G mutant loads, assessed in 7, 17, 11, and 5 different tissues from 4 terminations, respectively, were identical in all tissues from a given individual (mean (SD) 78 (1.2)%, 91 (0.7)%, 74 (2)%, and 63 (1.6)% for the 4 fetuses, respectively). CONCLUSIONS: Our results indicate that the placental/amniotic mutant loads do reflect the NARP mutant mtDNA load in the whole fetus, even when the sample amount is small, and suggest that heteroplasmy level remains stable during pregnancy, at least after 10 weeks of gestation. Although these data establish the feasibility of PND for this mutation, assessing more precisely the correlation between mutant load and disease severity should further help in interpreting PND results.


Subject(s)
DNA, Mitochondrial/genetics , DNA, Mitochondrial/metabolism , Mitochondrial Proton-Translocating ATPases/genetics , Prenatal Diagnosis , Syndrome , Amniotic Fluid/metabolism , Ataxia/genetics , DNA Mutational Analysis , Embryonic Development , Female , Humans , Male , Models, Genetic , Nervous System Diseases/genetics , Placenta/metabolism , Pregnancy , Retinitis Pigmentosa/genetics
14.
J Med Genet ; 43(10): 788-92, 2006 Oct.
Article in English | MEDLINE | ID: mdl-16690729

ABSTRACT

INTRODUCTION: Myopathy, encephalopathy, lactic acidosis, and stroke-like (MELAS) syndrome, a maternally inherited disorder that is among the most common mitochondrial DNA (mtDNA) diseases, is usually associated with the m.3242A>G mutation of the mitochondrial tRNA(leu) gene. Very few data are available with respect to prenatal diagnosis of this serious disease. The rate of mutant versus wild-type mtDNA (heteroplasmy) in fetal DNA is indeed considered to be a poor indicator of postnatal outcome. MATERIALS AND METHODS: Taking advantage of a novel semi-quantitative polymerase chain reaction test for m.3243A>G mutant load assessment, we carried out nine prenatal diagnoses in five unrelated women, using two different fetal tissues (chorionic villi v amniocytes) sampled at two or three different stages of pregnancy. RESULTS: Two of the five women, although not carrying m.3243A>G in blood or extra-blood tissues, were, however, considered at risk for transmission of the mutation, as they were closely related to MELAS-affected individuals. The absence of 3243A>G in the blood of first degree relatives was associated with no mutated mtDNA in the cardiovascular system (CVS) or amniocytes, and their three children are healthy, with a follow-up of 3 months-3 years. Among the six fetuses from the three carrier women, three were shown to be homoplasmic (0% mutant load), the remaining three being heteroplasmic, with a mutant load ranging from 23% to 63%. The fetal mutant load was fairly stable at two or three different stages of pregnancy in CVS and amniocytes. Although pregnancy was terminated in the case of the fetus with a 63% mutant load, all other children are healthy with a follow-up of 3 months-6 years. CONCLUSION: These data suggest that a prenatal diagnosis for MELAS syndrome might be helpful for at-risk families.


Subject(s)
DNA, Mitochondrial , Fetal Development/genetics , Genes, Mitochondrial/genetics , MELAS Syndrome/diagnosis , Prenatal Diagnosis/methods , Acidosis, Lactic/diagnosis , Acidosis, Lactic/embryology , Acidosis, Lactic/genetics , Adolescent , Adult , Child , Child, Preschool , DNA Mutational Analysis , Family , Female , Humans , Infant , MELAS Syndrome/embryology , MELAS Syndrome/genetics , Male , Mitochondrial Encephalomyopathies/diagnosis , Mitochondrial Encephalomyopathies/embryology , Mitochondrial Encephalomyopathies/genetics , Muscular Diseases/diagnosis , Muscular Diseases/embryology , Muscular Diseases/genetics , Pedigree , Polymerase Chain Reaction , Pregnancy , RNA, Transfer, Leu/genetics , Stroke/diagnosis , Stroke/embryology , Stroke/genetics
15.
Prog Urol ; 17(3): 568-75, 2007 May.
Article in French | MEDLINE | ID: mdl-17622092

ABSTRACT

Botulinum toxins are among the most powerful of all natural poisons. They are responsible for human botulism and constitute potential chemical weapons, but are nevertheless used as therapeutic agents in an increasing number of indications and medical specialties. Botulinum toxins were used for the first time in urology by intrasphincteric injection by Dykstra in 1988 to treat detrusor-sphincter dyssynergia in spinal cord injury patients. Schurch performed the first intradetrusor injections in 2000 to treat incontinence due to overactive bladder in adult spinal cord injury or multiple sclerosis patients. This review of the literature presents the results and level of proof for the use of botulinum toxin intradetrusor injection to treat neurogenic voiding disorders. Botulinum toxin A intradetrusor injections constitute a safe, conservative, reversible and short-term effective (6-12 months) alternative after failure of anticholinergic therapy for overactive bladder and its clinical consequences in adult spinal cord injury or multiple sclerosis patients (level 1b) and in children with neural tube defects (level 4). The efficacy of the first injection appears to be maintained at subsequent injections (up to 10 cycles) (level 4). Convergent and longer-term data are necessary to document and more clearly define the medium- and long-term efficacy profile of this approach, currently considered to be a major progress in neurourology.


Subject(s)
Botulinum Toxins, Type A/therapeutic use , Spinal Cord Injuries/physiopathology , Urinary Bladder, Neurogenic/drug therapy , Urinary Bladder, Overactive/drug therapy , Botulinum Toxins, Type A/administration & dosage , Humans , Injections, Spinal , Neuromuscular Agents/administration & dosage , Neuromuscular Agents/therapeutic use , Spinal Cord Injuries/complications , Urinary Bladder, Neurogenic/etiology , Urinary Bladder, Overactive/etiology , Urinary Incontinence/drug therapy , Urinary Incontinence/etiology
16.
Ann Phys Rehabil Med ; 59(2): 125-9, 2016 Apr.
Article in English | MEDLINE | ID: mdl-27053002

ABSTRACT

Intermittent catheterization is considered the standard of care in most neurologic patients with lower urinary tract disorders. However, in this context, genitourinary tract infection and urethral trauma represent specific challenges. Such conditions have been found to significantly deteriorate quality of life and complicate subsequent treatments. Only optimal prevention associated with appropriate treatment allows for the long-term continuation of such bladder management. Here, we discuss the diagnosis and therapeutic and preventive approaches associated with genitourinary tract infection and urethral trauma in this specific population. This "state-of-the-art" article results from a literature review (MEDLINE articles and scientific society guidelines) and the authors' experience. It was structured in a didactic way to facilitate comprehension and promote the implementation of advice and recommendations in daily practice. Genitourinary tract infection and urethral trauma associated with intermittent catheterization in neurologic patients should be managed with a global approach, including patient and caregiver education, optimal catheterization with hydrophilic-coated or pre-lubricated catheters and adequate use of antibiotic therapy.


Subject(s)
Intermittent Urethral Catheterization/adverse effects , Reproductive Tract Infections/etiology , Reproductive Tract Infections/therapy , Urethra/injuries , Urinary Tract Infections/etiology , Urinary Tract Infections/therapy , Anti-Bacterial Agents/therapeutic use , Humans , Intermittent Urethral Catheterization/instrumentation , Nervous System Diseases/physiopathology , Patient Education as Topic , Reproductive Tract Infections/diagnosis , Urinary Tract Infections/diagnosis
17.
Can J Urol ; 12(1): 2543-6, 2005 Feb.
Article in English | MEDLINE | ID: mdl-15777492

ABSTRACT

INTRODUCTION AND OBJECTIVES: To study the effects of intradetrusor botulinum-A toxin (BTA) (BOTOX) injections in adult patients with detrusor overactivity who failed to respond to anticholinergic medications or developed intolerable side-effects. MATERIALS AND METHODS: Ten patients (average age 41 years, range 19-76 years) with neurogenic bladder and detrusor overactivity who were using clean intermittent catheterization 4 to 7 times a day with anticholinergic therapy were included in our study. Their history, physical examination, abdominal ultrasound, urine analysis, serum creatinine and electrolytes, as well as multichannel urodynamic evaluation were documented before administration of BTA injections. Anticholinergic medication was stopped at the time of injection. Three hundred to 400 U of BTA were injected into 30 to 40 different sites in the detrusor muscle under cystoscopic guidance. Clinical assessment and urodynamic testing were repeated 3 months after injection. RESULTS: Five patients were tetraplegic and five were paraplegic at the thoracic or lumbar level. Three patients had incontinence episodes between catheterizations before treatment, and only one patient continued to have incontinence episodes between catheterizations after treatment. Reflex volume increased by 63.08% from 180 +/- 44.99 ml to 293.7 +/- 208.42 ml (p < 0.02). Maximal bladder capacity was augmented by 73.63% from 290 +/- 131.64 ml to 518.20 +/- 273.35 ml (p < 0.03). Maximal detrusor pressure decreased by 15.52% from 69.60 +/- 39.19 cmH(2)O to 58.80 +/- 33.95 cmH(2)O (p < 0.2). No patients complained of side effects. CONCLUSION: BTA appears to be an effective and safe therapeutic option for overactive bladder in patients with spinal cord injury failing anticholinergic therapy and delays more invasive treatments. These initial results confirm European literature reports.


Subject(s)
Botulinum Toxins, Type A/therapeutic use , Neuromuscular Agents/therapeutic use , Urinary Bladder, Neurogenic/drug therapy , Adult , Aged , Female , Humans , Male , Middle Aged , Spinal Cord Injuries/complications , Urinary Bladder, Neurogenic/etiology
18.
Int J Radiat Oncol Biol Phys ; 11(8): 1483-7, 1985 Aug.
Article in English | MEDLINE | ID: mdl-4019272

ABSTRACT

Maltose tetrapalmitate (MTP), a synthetic nontoxic immunoadjuvant, the radiosensitizer misonidazole (MISO), and 60Co gamma-radiation, alone or in combination, were used in the management of Dunning prostatic tumor in the rat. Nine groups of 10 rats each were used to assess the efficacy of various therapeutic modalities. Tumor growth rates and animal survival times were determined for each group. Radiation was more effective when combined with MTP, but the adjuvant must be present when radiation is given for synergism to occur. MISO was as effective as MTP when used with radiation, but combining them cancels out their individual effects. In a clinical situation it would be advantageous to use separately the synergisms existing between MISO and radiation on the one hand and MTP and radiation on the other hand.


Subject(s)
Adjuvants, Immunologic/therapeutic use , Cobalt Radioisotopes/therapeutic use , Glycolipids/therapeutic use , Misonidazole/therapeutic use , Nitroimidazoles/therapeutic use , Prostatic Neoplasms/therapy , Animals , Antineoplastic Agents/therapeutic use , Combined Modality Therapy , Male , Prostatic Neoplasms/drug therapy , Prostatic Neoplasms/radiotherapy , Rats
19.
Neuropeptides ; 11(2): 83-7, 1988.
Article in English | MEDLINE | ID: mdl-2452993

ABSTRACT

Neurokinins are active stimulants of the human isolated urinary bladder. In a preliminary study, performed on bladders taken from four donors, we attempted the characterization of neurokinin receptors. It was shown that neurokinin A is more active than neurokinin B and substance P. Neurokinin receptors selective agonists were also tested and it was found that the most active compound was the NK-A selective agonist, [Nle10]NKA 4-10: A substance P antagonist was able to reduce the effect of neurokinin A but its affinity was rather low. This suggests that the receptor mediating the contraction of the human urinary bladder to neurokinins is of the NK-A (NK2) type. The action of neurokinins on the human urinary bladder appears to be a direct one and mediated by specific receptors different from those of other agents. On the contrary, kinins were found to be active through a new mechanism which was not influenced by either anti-B1 or anti-B2 receptor antagonists.


Subject(s)
Neuropeptides/pharmacology , Substance P/pharmacology , Urinary Bladder/drug effects , Adult , Humans , In Vitro Techniques , Middle Aged , Muscle Contraction/drug effects , Neurokinin A , Neurokinin B , Neuropeptides/metabolism , Receptors, Neurokinin-2 , Receptors, Neurotransmitter/drug effects , Receptors, Neurotransmitter/metabolism , Urinary Bladder/physiology
20.
Urology ; 46(5): 643-7, 1995 Nov.
Article in English | MEDLINE | ID: mdl-7495113

ABSTRACT

OBJECTIVES: Mineral kidney stones are frequently difficult to detect due to their radiotranslucency. We have recently developed a method that enhances the visibility of such stones by retrograde infusions of certain heavy metal salt solutions such as cesium or lanthanide gadolinium. This report describes toxicologic studies carried out on the use of those contrast agents to introduce this technique eventually into clinical trials. METHODS: Systemic absorption was assessed in dogs through infusion of radioactive contrast agent into the renal pelvis with or without ureteral obstruction. Radioactivity in urine and blood was monitored. Local toxicity was studied in animals infused with the contrast agent at intervals up to 4 weeks. RESULTS: Reabsorption studies under high intrapelvic pressures (70 cm H2O or higher), demonstrated reabsorption of cesium. However, at normal intrapelvic pressures, only a moderate reabsorption of cesium was observed. No gadolinium reabsorption was detected even at high intrapelvic pressures. Histopathologic studies showed no major urothelial lesions but only a transient inflammatory reaction that was undetectable 4 weeks following exposure to gadolinium salts. CONCLUSIONS: Gadolinium salt solutions are good positive radiocontrast agents for mineral kidney stones without having serious toxic effects or systemic reabsorption.


Subject(s)
Cesium Radioisotopes/toxicity , Contrast Media , Gadolinium/toxicity , Radioisotopes/toxicity , Absorption , Animals , Cesium Radioisotopes/pharmacology , Contrast Media/pharmacology , Dogs , Female , Gadolinium/pharmacology , Kidney/drug effects , Kidney/pathology , Kidney Calculi/diagnostic imaging , Pressure , Radioisotopes/pharmacology , Radionuclide Imaging
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