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REVIEW ARTICLE
Year : 2008  |  Volume : 24  |  Issue : 1  |  Page : 22-27
 

Chronic prostatitis: Current concepts


Department of Urology, Wexham Park Hospital, Slough, United Kingdom

Correspondence Address:
Vibhash C Mishra
5 Lincolnshire Gardens Warfield, Bracknell RG42 3XB
United Kingdom
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0970-1591.38598

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   Abstract 

Purpose: Chronic prostatitis (CP) is a common condition. It causes significant suffering to the patients and constitutes a sizeable workload for the urologists. The purpose of this review is to describe the currently accepted concepts regarding the aspects of CP.
Materials and Methods: Relevant papers on the epidemiology, etiology, diagnosis, evaluation and management of CP were identified through a search of MEDLINE using text terms "prostatitis", "chronic prostatitis" and "chronic pelvic pain syndrome". The list of articles thus obtained was supplemented by manual search of bibliographies of the identified articles and also by exploring the MEDLINE option "Related Articles".
Results: The salient points of the relevant articles on each aspect of CP have been summarized in the form of a non-systematic narrative review.
Conclusion: Chronic prostatitis is caused by a variety of infective and non-infective factors and is characterized by a rather long remitting and relapsing clinical course. The diagnosis is based on symptoms comprising pain and nonspecific urinary and/or ejaculatory disturbances and microbiological tests to localize bacteria and/or leucocytes in segmented urinary tract specimens. The contemporary classification was proposed by the National Institutes of Health/National Institute of Diabetes Digestive Kidney Diseases (NIH/NIDDK). National Institutes of Health - Chronic Prostatitis Symptom Index (NIH-CPSI) is the patient evaluation tool used extensively in clinical practice and research. Management should be individualized, multimodal and of an appropriate duration.


Keywords: Chronic pelvic pain syndrome, chronic prostatitis, prostate, prostatitis


How to cite this article:
Vaidyanathan R, Mishra VC. Chronic prostatitis: Current concepts. Indian J Urol 2008;24:22-7

How to cite this URL:
Vaidyanathan R, Mishra VC. Chronic prostatitis: Current concepts. Indian J Urol [serial online] 2008 [cited 2019 Nov 13];24:22-7. Available from: http://www.indianjurol.com/text.asp?2008/24/1/22/38598



   Introduction Top


Chronic prostatitis (CP) is a common, yet poorly understood condition. It spells misery not only for the patients who have to suffer, but also for the urologists looking after them. They often find themselves running out of ideas when faced with this difficult problem, as there are few effective treatment options available at their disposal. Research in this field in the last few years has centered on the generation of a new classification system and a symptom score to evaluate patients with. It is expected that better categorization of patients will result in more individualized use of the existing treatment modalities, some of which have recently been tested in a randomized controlled setting. The purpose of this update is to familiarize the reader with the currently accepted concepts in a continuously evolving area.

The term chronic prostatitis should be considered a misnomer in that the entity may not necessarily be inflammatory or exclusively prostatic in origin. Bearing in mind this caveat, CP can be defined as a clinical syndrome characterized by pain in the perineum, pelvis, suprapubic area or the external genitalia, with a variable degree of voiding and/or ejaculatory disturbance. [1]


   Epidemiology Top


Prostatitis is a significant health problem with prevalence rates of 11-16%. [2],[3] More than 2 million consultations for prostatitis are required every year in the United States [4] and each Canadian urologist treats about 262 such patients every year. [5] Prostatitis is the most common reason for men under 50 to consult a urologist [4] and indeed it generates more physician visits than benign prostatic hyperplasia or prostate cancer in the United States. [6] It has a significant impact on the quality of life (QoL) comparable to active Crohn's disease or a recent myocardial infarction. [7] Up to 50% of men may be affected by it at some stage of their lives. [8],[9]


   Classification Top


Rather than being a single entity, prostatitis encompasses a spectrum of closely related symptom complexes of varied etiopathogenesis. Any classification of this condition should recognize this fact. Drach et al. were the first to use a systematic approach to the diagnosis and management of patients with symptoms of prostatitis, based on the microscopic examination and cultures of segmented urogenital tract specimens. [10]

A workshop on prostatitis sponsored by National Institutes of Health/National Institute of Diabetes, Digestive and Kidney diseases (NIH/NIDDK) [11] in 1995 agreed on the standard contemporary classification system, which is Shown in [Table - 1].


   Aetiopathogenesis Top


A myriad of etiological factors - some not even involving the prostate gland - have been postulated. The initiator of the inflammatory process could be a local infection, chemical irritation, dysfunctional voiding, intraductal reflux, neuromuscular disturbances or an immunological process. There may be an etiological link between Category III prostatitis and interstitial cystitis (IC). The pathogenesis is not entirely certain, but the following may be a possible mechanism. Regardless of the triggering factor, the resultant inflammatory process causes tissue edema and increased intra-prostatic pressure leading to local hypoxia and varied mediator-induced tissue damage. This leads to altered neurotransmission in sensory nerve fibers thereby resulting in the pain and other symptoms associated with the condition.

Infection

Category I and II prostatitis are caused by bacterial infection. The role of infection in Category III prostatitis is not established although cryptic, non-culturable organisms may be responsible.

Bacteria can be isolated preferentially from an expressed prostatic secretion (EPS) or a post-prostatic massage urine specimen rather than from the mid-stream urine (MSU) sample [12] or can be demonstrated on the prostatic biopsy specimen. [13],[14] Common pathogens are aerobic gram-negative bacteria and gram-positive cocci including enterococci and staphylococci. Several other anterior urethral commensals can also cause prostatitis under special circumstances. [8]

In Category III prostatitis, although absence of bacterial infection is inherent in the definition, numerous investigators have proposed possible infection with atypical or fastidious organisms. [13],[15] Identification of bacterial DNA [16] and clinical improvement sometimes seen with antibiotic treatment [17] in this group provide justification for the trial of antibiotic treatment in these patients despite the lack of laboratory-proven infection.

Lack of uniformity in response to antibacterial treatment and the inability to consistently isolate any pathogenic organisms in the appropriate specimens in addition to the difficulties in determining the respective roles of commensal versus virulent organisms have led to the search for other etiological factors.

Dysfunctional high-pressure voiding

The NIH classification emphasized genitourinary pain as the main characteristic of CP. Pain and the lower urinary tract symptoms associated with CP are by no means specific to the condition and may be caused by either an anatomic or physiological cause of lower urinary tract obstruction such as bladder neck stenosis, [18] urethral stricture, detrussor sphincter dyssynergia [19] or a dysfunctional voiding pattern. [20] Video pressure flow studies with synchronous electromyography of external sphincter have demonstrated decreased flow rate and increased maximal urethral closure pressure. This was observed in both Category IIIA and IIIB patients. [21],[22] This explains why some of these patients respond favorably to the use of α-blockers. [21]

Intraprostatic ductal reflux

Crystallographic analysis of prostatic calculi has shown them to be made exclusively of urinary constituents [23] and high levels of urate and creatinine have been found in EPS. [24] This suggests intraprostatic ductal reflux as another possible etiological factor in CP. As a result of urine reflux, chronic inflammation and tissue edema may lead to voiding disturbances with further reflux of urine perpetuating a vicious cycle.

Autoimmunity

Several authors [25],[26] have suggested the inflammation in CP to be caused by an autoimmune process or induced by an unknown antigen. Elevated levels of pro-inflammatory cytokines [25] are present in seminal plasma in patients with Category III prostatitis. Shoskes et al., [27] also found low levels of the anti-inflammatory cytokine IL-10 in men with prostatitis.

Immune response in CP seems to be T-cell mediated with cytotoxic (CD8) T cells predominating over helper (CD4) T cells. [28] COX 2 is undetectable in normal tissues but is over-expressed in tissues with inflammation and possibly upregulated by inflammatory cytokines IL-1B and TNFα. NSAIDs blocking COX 1 and 2 have been successfully used in the treatment of CP.

Interstitial cystitis

There are striking similarities in the clinical presentation of CP and IC. Occult infection, "leaky epithelium", neurogenic inflammation, mast cell activation and autoimmunity have been implicated in the etiology of both conditions. Mastocytosis and elevated urinary histamine levels in patients with CP have been reported and Parsons potassium sensitivity test has been shown to be positive in over 80% of Category IIIA prostatitis. A trial of Pentosan polysulfate in Category IIIA prostatitis showed a significant difference in the symptom scores and there is a case for more extensive evaluation of the role of agents to restore the epithelial integrity. [29]

Neuromuscular problem

One of the several hypotheses suggests that chronic pain in CP is neuropathic in character and there is a neuromuscular etiology for both Type IIIA and IIIB prostatitis. Type IIIB prostatitis may be a manifestation of reflex sympathetic dystrophy. [30]

Neurogenic inflammation is a process by which nerves may secrete mediators producing local inflammation and /or hyperalgesia. This role of neurogenic inflammation in Category III prostatitis has not been extensively studied. However, symptomatic improvement with intravesical instillation of substances like dimethylsulfoxide [31] suggests that it may play a role in the symptomatic exacerbation in some patients.


   Clinical Presentation and Evaluation Top


As mentioned at the outset, the symptoms of CP are non-specific and there is great overlap between this condition and other causes of lower urinary tract dysfunction. By definition, the symptoms must have been present for at least three months, though in practice, the patients have usually had them for several years. Waxing and waning of symptoms is a common occurrence.

Chronic prostatitis is essentially a diagnosis of exclusion. Thus the evaluation should aim at excluding other possible causes for the patients' symptoms such as benign prostatic hyperplasia, urethral stricture, urinary infection etc. and a recommended workup is shown in [Table - 2].

Once these competing conditions have been excluded, the evaluation should be carried out using the National Institutes of Health - Chronic Prostatitis Symptom Index (NIH-CPSI) [Table - 3], which is a validated tool generated from the NIH/ NIDDK workshop and recommended for use in clinical practice as well as research. [11]

The NIH-CPSI examines the three main domains of prostatitis namely pain, urinary symptoms and QoL. It is a nine-item questionnaire that is simple, easy and quick to administer and should be used to establish the patients' baseline bother, which should inform the requirement for treatment, to stratify patients on the basis of their predominant symptoms and accordingly to select the best treatment and to monitor the response to treatment.


   Diagnosis Top


The diagnosis is based on symptomatology and localization of organisms and/or leucocytes in segmented urogenital tract specimens. Of all evaluation methods, the gold standard is the four glass test proposed by Meares and Stamey. [32] It involves obtaining the following specimens for microscopy and culture - the first voided 5-10 ml urine (VB1), midstream urine (VB2), pure prostatic secretion expressed by prostatic massage (EPS) and the first voided 5-10 ml urine after prostatic massage (VB3). The findings of organism(s) with or without WBCs, WBCs without organisms and neither WBCs nor organisms in EPS and/or VB3 indicate a diagnosis of Category II, IIIA and IIIB prostatitis respectively.

A less tedious, time-consuming and expensive but almost equally effective modification of the four glass test, the pre- and post-massage test (PMPT), has been proposed by Nickel. [33] The PMPT involves microscopy and culture of pre- and post-prostatic massage urine sample with a positive post-massage sample indicating the possibility of CP.


   Management Top


As is evident from the preceding discussion, CP is not a single disease entity and different factors may be involved not only in different patients but even in an individual patient. Thus the treatment should be individualized. To date there are few data to support rational therapeutic decisions for the management of CP. Studies providing unequivocal evidence of efficacy of any particular modality of treatment are few and far between and therefore, recommendations are commonly based on clinical and anecdotal experience of experts. Symptom control rather than eradication seems a more realistic objective and to be effective towards that goal, the management should be multimodal, of an appropriate duration and incremental in nature.

We have briefly outlined the investigated treatment options based on the material available in literature.

Antimicrobial agents

Bacteria such as E. Coli, Enterococci, Pseudomonas, Klebsiella and Proteus have been implicated in Type I and Type II prostatitis. Moreover, even in Type IIIA prostatitis, there may be a role of Chlamydia, Ureaplasma and other fastidious organisms or viruses. Results of treatment are generally better for CP due to E. coli and other enterobactericeae than that caused by Pseudomonas and Enterococci. [9] The commonly used antibiotics include Quinolones, Azithromycin, Tetracycline, Co-trimoxazole and amoxicillin. Use of a quinolone for at least a month is the most popular regime and seems to be better than co-trimoxazole. [34] It is usually effective in culture-proven Category II patients, but used quite frequently even in the absence of a positive culture.

Anti-inflammatory agents

The theory behind the use of NSAIDs is that they reduce pain, inhibit activation and function of neutrophils and reduce edema. The primary symptoms of chronic prostatitis are perineal, lower abdominal, testicular, penile and ejaculatory pain. Relief of the pain and discomfort associated with CP is the primary goal of therapy. NSAID therapy is one of the most common treatments for CP. However, hard evidence for NSAID therapy has been provided by only one randomized controlled study, which showed a higher percentage of patients with a 25% or six-point improvement in total NIH/CPSI score with 50 mg rofecoxib for six weeks compared to placebo. [35]

Muscle relaxants

Diazepam and baclofen can be used in Category IIIB prostatitis when sphincter dyssynergia or pelvic floor/ perineal muscle spasm is confirmed. The evidence for this is rather old [36] and the role of these agents has not been re-evaluated subsequently.

Alpha-blockers

The rationale for using alpha-blockers is provided by the significant overlap of obstructive and irritative symptoms between prostatitis and benign prostatic hyperplasia. Therefore, by derivation a drug that helps the symptoms of one condition should also be effective for the other. Moreover, Barbalias observed increased maximum urethral closure pressure caused by hypertonia of the prostatic urethra from adrenergic over-activity in CP, resulting in dysfunctional voiding, intraductal reflux and nonspecific inflammation. [37] A recent systematic review of the literature concluded that alpha-blockers administered for at least three months may have a useful role in the treatment of severely symptomatic, treatment naοve patients with Type III prostatitis who have particularly high scores in the NIH-CPSI urinary domain. [38]

Alpha reductase inhibitors

5 alpha reductase inhibitors (5 ARIs) are well known to reduce lower urinary tract symptoms by decreasing the gland size. They may also reduce the intraprostatic reflux and thereby the inflammatory process. [39]

Phytotherapy

There are two phytotherapeutic agents that have been evaluated for use in CP: quercetin and cernilton. [40],[41] Quercetin is an anti-oxidant and nitric oxide inhibitor. Cernilton may be associated with cyclooxygenase inhibition or relaxation of smooth muscles. Both agents have been shown to produce significant symptomatic improvement though the exact mechanism of action is not well understood.

Prostatic massage

The benefits of prostatic massage are believed to be derived from a combination of several factors including expression of inspissated prostatic secretions, relief of pelvic muscle spasm, physical disruption of any protective biofilm, improved circulation and thus penetration of antibiotics. [42] The only randomized controlled trial failed to show any benefit from prostatic massage. [43] However, there are case series and anecdotal reports suggesting that bi- or tri-weekly massage for six to 12 weeks used alongside antibiotics possibly provides some symptomatic relief to a quarter to a third of patients with CP. [33],[44]

Thermotherapy

A Cochraine Review evaluated five studies of different types of heat treatments [either transrectal microwave hyperthermia (TRMH) or transurethral microwave thermotherapy (TUMT)] for Type III prostatitis and showed significant improvements in symptoms with heat treatment compared with sham treatment. [45]

Electromagnetic therapy

In a small randomized controlled trial, Rowe et al., demonstrated a statistically significant difference in NIH-CPSI scores of men with Type III prostatitis treated with pelvic electromagnetic therapy compared to placebo. [46]

The following general management recommendations have been made on the basis of evidence currently available in the literature. [33]

Type I prostatitis is effectively treated with antibiotics and Type IV does not require treatment.

Patients with Type II should be treated with six to 12 weeks of antibiotics, which should be combined with prostatic massage for refractory or relapsing cases, although there is a lack of hard evidence for much benefit from massage in this situation.

Type IIIA prostatitis should first be treated with antibiotics and prostatic massage. Once again the evidence for the latter is soft. Alpha-blockers should be used for patients with a particularly high score in the NIH-CPSI urinary domain. For refractory cases, anti-inflammatories, 5ARIs, phytotherapy or TUMT may be considered.

Patients with Type IIIB prostatitis are the most difficult to treat. Alpha-blockers, analgesics, muscle relaxants and tricyclic antidepressants used concurrently may provide amelioration of symptoms.


   Conclusion Top


In summary, CP is a common problem affecting relatively younger men. It is characterized by a variable mix of pain, urinary and ejaculatory symptoms. The etiology is multifactorial. Diagnosis is based on symptoms and localization tests, which also provide the basis for classification. There are multiple options for treatment, which should be used according to the individual merit of each case to achieve what may often be only symptom control rather than eradication.

 
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    Tables

  [Table - 1], [Table - 2], [Table - 3]

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    Introduction
    Epidemiology
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    Clinical Present...
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    References
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