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Master's Dissertation
DOI
10.11606/D.5.2004.tde-19032007-140312
Document
Author
Full name
Rogério Matos Araujo
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2004
Supervisor
Committee
Gomes, Cristiano Mendes (President)
Cordeiro, Paulo
Mazzucchi, Eduardo
Title in Portuguese
Avaliação urodinâmica em pacientes com sintomas do trato urinário inferior e volume prostático menor que 40 centímetros cúbicos
Keywords in Portuguese
Estudos retrospectivos
Hiperplasia prostática/diagnóstico
Próstata/fisiopatologia
Registros médicos/estatística & dados numéricos
trato urinário/ complicações
Trato urinário/patologia
Urodinâmica
Abstract in Portuguese
INTRODUÇÃO - As manifestações clínicas da hiperplasia prostática benigna envolvem a interação entre três fatores: sintomas miccionais, aumento do volume prostático e obstrução infravesical. A relação entre estes fatores é complexa e parcialmente entendida. O objetivo do presente estudo foi avaliar os achados urodinâmicos de pacientes com sintomas do trato urinário inferior e volume prostático menor que 40cm3, com ênfase nos parâmetros obstrução infravesical, hiperatividade detrusora e contratilidade detrusora. CASUÍSTICA E MÉTODOS - Os prontuários e exames urodinâmicos de 33 pacientes foram analisados retrospectivamente. A média de idade dos pacientes foi de 60,3 ± 9,3 anos, variando de 40 a 78 anos. Os sintomas do trato urinário inferior foram avaliados com o escore internacional de sintomas prostáticos (IPSS). O volume prostático e os seguintes parâmetros urodinâmicos foram analisados: fluxo máximo, capacidade cistométrica máxima, complacência, presença de hiperatividade detrusora, fluxo máximo no estudo fluxo/pressão, pressão detrusora no fluxo máximo, contratilidade detrusora e resíduo miccional. Analisou-se, também, o impacto da obstrução infravesical, hiperatividade detrusora e volume prostático nos sintomas miccionais e parâmetros urodinâmicos. RESULTADOS - As médias do volume prostático e IPSS foram 26,5 ± 6,9cm3 e 16,8 ± 5,0, respectivamente. Anormalidades urodinâmicas foram encontradas em 30 (90,9%) pacientes, sendo obstrução infravesical e hiperatividade detrusora os achados mais freqüentes, cada qual acometendo 16 (48,5%) pacientes. A prevalência da hiperatividade detrusora foi de 50,0% entre os pacientes obstruídos e de 47,0% nos pacientes sem obstrução infravesical (p = 0,99). Hipocontratilidade detrusora foi observada em 18,8% dos obstruídos e 64,7% dos pacientes sem obstrução (p = 0,013). O índice de contratilidade detrusora foi de 111,7 ± 20,8 nos pacientes obstruídos e de 92,9 ± 17,3 nos pacientes sem obstrução (p = 0,008). Nos pacientes com e sem hiperatividade detrusora, encontrou-se diferença estatisticamente significativa na complacência vesical, que foi de 15,4 ± 9,6ml/cmH2O nos pacientes com hiperatividade detrusora e de 28,8 ± 10,8ml/cmH2O nos pacientes sem hiperatividade detrusora (p = 0,007). CONCLUSÕES - O estudo urodinâmico identifica anormalidades vesicais na maioria dos pacientes com sintomas do trato urinário inferior e volume prostático menor que 40cm3. Embora a obstrução infravesical seja um achado comum, mais da metade dos pacientes tiveram outras alterações vesicais responsáveis pelos seus sintomas, principalmente hiperatividade detrusora e diminuição da contratilidade detrusora, reforçando o valor dos exames urodinâmicos nesta população.
Title in English
Urodynamic evaluation of patients with lower urinary tract symptoms and prostate volumes less than 40cc
Keywords in English
Medical records/statistics & numerical data
Prostate/physiopathology
Prostatic hyperplasia/diagnosis
Retrospective studies
Urinary Tract/complications
Urinary tract/pathology
Urodynamics
Abstract in English
INTRODUCTION - The clinical manifestations of benign prostatic hyperplasia involve the correlation of three elements: voiding symptoms, prostate enlargement and bladder outlet obstruction. The interaction between these factors is complex and incompletely understood. The objective of this study was to evaluate the urodynamic findings in patients with lower urinary tract symptoms and prostate volumes less than 40cc, focusing on the parameters bladder outlet obstruction, detrusor overactivity and detrusor hypocontractility. PATIENTS AND METHODS - The records and urodynamic studies of 33 patients with lower urinary tract symptoms and prostate volumes less than 40cc were reviewed. Average age of the patients was 60.3 ± 9.3 years (range 40 to 78 years). Lower urinary tract symptoms were evaluated with the International Prostate Symptom Score (IPSS). Prostate volume and the following urodynamic parameters were analyzed: maximum flow rate, maximum cystometric capacity, compliance, presence of detrusor overactivity, maximum flow rate during pressure/flow studies, detrusor pressure at maximum flow rate, detrusor contractility e post void residual volume. We also evaluated the impact of bladder outlet obstruction, detrusor overactivity and prostate volume on the voiding symptoms and urodynamic parameters. RESULTS -Mean prostate volume and IPSS were 26.5 ± 6.9 cc and 16.8 ± 5.0, respectively. Urodynamic abnormalities were found in 30 (90.9%) patients, with a preponderance of bladder outlet obstruction and detrusor overactivity, each affecting 16 (48.5%) patients. The prevalence of detrusor overactivity was 50.0% in the obstructed patients and 47.0% in patients without bladder outlet obstruction (p = 0.99). Detrusor hypocontractility was present in 18.8% of the obstructed patients and 64.7% of the non-obstructed patients (p = 0.013). The detrusor contractility index was 111.7 ± 20.8 in the obstructed patients and 92.9 ± 17.3 in those without bladder outlet obstruction (p = 0.008). In the patients with and without detrusor overactivity there was a statistically significant difference in bladder compliance, which was 15.4 ± 9.6 ml/cmH2O in the patients with detrusor overactivity and 28.8 ± 10.8 ml/cmH2O in those without detrusor overactivity (p = 0.007). CONCLUSIONS - Urodynamic studies identify bladder abnormalities in most patients with lower urinary tract symptoms and prostate volumes less than 40cc. Although bladder outlet obstruction is a common diagnosis, more than half of the patients had other types of bladder dysfunction as the basis for their voiding symptoms, predominantly detrusor overactivity and decreased detrusor contractility, emphasizing the value of urodynamic studies in this population.
 
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Publishing Date
2007-03-21
 
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