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==Overview==
==Overview==
Urethritis is due to [[inflammation]] of the [[urethra]]. Based on [[etiology]] it is classified into two main groups,  [[infectious]] and non-infectious. [[Infectious]] [[causes]] are further classified into [[gonorrheal]] and [[non-gonorrheal]]. Urethritis is an [[inflammation]] of the [[Sex organ|genital tract]] that is mostly due to [[infectious]] [[causes]]. Its [[pathogenesis]] depends on the causative [[pathogen]]. [[Microscopic]] findings for gonococcal urethritis include, presence of [[gram-negative]] [[intracellular]] [[diplococci]] ([[GNID]]), invaded [[epithelial cells]], [[vacuoles]] that contain multiple [[organisms]], and >2 [[WBC]] per oil immersion field. [[Nongonococcal urethritis]] (NGU) is [[microscopically characterized by [[signs]] of [[inflammation]] with absence of [[gram-negative]] [[intracellular]] [[diplococci]]. If [[symptoms]] are present but no evidence of [[urethral]] [[inflammation]] is present, Nucleic Acid [[Amplification Tests]] (NAATs) for [[C. trachomatis]] and [[N. gonorrhoeae]] might identify [[infections]].The most potent [[risk factor]] for urethritis is unprotected sex, especially among men who have sex with men. Other risk factors include low socioeconomic status, history of [[sexually transmitted diseases]], and multiple sex partners. Urethritis is primarily [[diagnosed]] based on [[symptoms]], [[signs]] of  [[urethral]] [[inflammation]] and [[microscopic]] findings. Symptoms may comprise of [[dysuria]], [[urethral pruritus]], burning, [[Signs]] of  [[urethral]] [[inflammation]] include urethral discharge, which can be mucoid, mucopurulent, or purulent. [[Microscopic]] findings in gonorrheal urethritis include, identification of  [[gram-negative]] [[intracellular]] [[diplococci]] ([[GNID]]) or purple [[intracellular]] [[diplococci]] on [[methylene blue]], or [[gentian violet]] stain. Presence of Invaded [[epithelial cells]], [[vacuoles]] that contain multiple [[organisms]] and >2 [[WBC]] per oil immersion field. Nongonococcal urethritis (NGU) is [[microscopically]] characterized by [[signs]] of [[inflammation]] with absence of [[gram-negative]] [[intracellular]] [[diplococci]]. If [[symptoms]] are present but no evidence of [[urethral]] [[inflammation]] is present, Nucleic Acid [[Amplification Tests]] (NAATs) for [[C. trachomatis]] and [[N. gonorrhoeae]] might identify [[infections]].Once the [[diagnosis is confirmed]], the appropriate [[antibiotic]] regimen should be initiated to reduce the risk of complications. [[Doxycycline]] 100 mg PO bid for 7 days is administered to treat [[Non-gonococcal urethritis|Non-gonococcal Urethritis]], as an alternative therapy [[azithromycin]] 1 g PO in a single dose or [[azithromycin]] 500 mg orally in a single dose; then 250 mg orally daily for 4 days is recommended. For gonococcal urethritis, [[ceftriaxone]] 500 mg IM in a single dose (for [[patients]] weighing ≥150 kg (300 lbs) [[ceftriaxone]] 1 g IM in a single dose), for alternate therapy [[gentamicin]] 240 mg PO in a single dose plus [[azithromycin]] 2 g PO in a single dose, or cefixime 800 mg PO in a single dose is recommended.
==Historical Perspective==
==Historical Perspective==
The first known case of urethritis was described by Albert Neisser, a German doctor, in 1879. In 1904, Ludwig Waelsch described mild non-gonococcal urethritis (NGU). In the 1930s and later, Philip Thygeson and others in the United States confirmed the [[vertical transmission]] of nongonococcal urethritis (NGU). 
The first known case of urethritis was described by Albert Neisser, a German [[doctor]], in 1879. In 1904, Ludwig Waelsch described mild non-gonococcal urethritis (NGU). In the 1930s and later, Philip Thygeson and others in the United States confirmed the [[vertical transmission]] of nongonococcal urethritis (NGU). 


==Classification==
==Classification==
Urethritis is classified into two main groups of infectious and non-infectious based on the etiology. Infectious causes further classified into gonorrheal and non-gonorrheal.  
Urethritis is classified into two main groups of [[infectious]] and non-infectious based on the [[etiology]]. [[Infectious]] causes are further classified into gonorrheal and non-gonorrheal.  
==Pathophysiology==
==Pathophysiology==
Urethritis is an [[inflammation]] of the [[Sex organ|genital tract]] that is mostly due to infectious causes. Its pathogenesis depends on the causative pathogen. ''[[Neisseria gonorrhoeae|N. gonorrhea]]'' is usually transmitted via the [[Sex organ|genital tract]] to the human host. Following attachment to host cell, which is mediated by [[pili]], [[Gonorrhea|''gonococci'']] become engulfed in a process known as parasite-directed [[endocytosis]]. This [[organism]] will survive inside the [[Vacuole|vacuoles]] and replicate. Among non-gonorrheal causes, ''[[Chlamydiae|Chlamydia trachomatis]]'' is the most common. The infectious process begins with cell surface attachment and [[phagocytosis]] by the host cell. The [[pathogen]] survives inside the [[Cell (biology)|cell]] by debilitating the cellular [[lysosomes]] and replicating as elementary bodies which is considered as the infective form of the [[pathogen]].
Urethritis is an [[inflammation]] of the [[Sex organ|genital tract]] that is mostly due to infectious causes. Its pathogenesis depends on the causative pathogen. ''[[Neisseria gonorrhoeae|N. gonorrhea]]'' is usually transmitted via the [[Sex organ|genital tract]] to the human host. Following attachment to host cell, which is mediated by [[pili]], [[Gonorrhea|''gonococci'']] become engulfed in a process known as parasite-directed [[endocytosis]]. This [[organism]] will survive inside the [[Vacuole|vacuoles]] and replicate. Among non-gonorrheal causes, ''[[Chlamydiae|Chlamydia trachomatis]]'' is the most common. The infectious process begins with cell surface attachment and [[phagocytosis]] by the host cell. The [[pathogen]] survives inside the [[Cell (biology)|cell]] by debilitating the cellular [[lysosomes]] and replicating as elementary bodies which is considered as the infective form of the [[pathogen]]. [[Microscopic]] findings for gonococcal urethritis include, presence of [[gram-negative]] [[intracellular]] [[diplococci]] ([[GNID]]), invaded [[epithelial cells]], [[vacuoles]] that contain multiple [[organisms]], and >2 [[WBC]] per oil immersion field. [[Nongonococcal urethritis]] (NGU) is microscopically characterized by [[signs]] of [[inflammation]] with absence of [[gram-negative]] [[intracellular]] [[diplococci]].
 
==Causes==
==Causes==
Urethritis may be caused by either infectious or non-infectious causes. Infectious causes can be further subdivided into ''gonorrheal'' and ''non-gonorrheal.'' Non-gonorrheal pathogens are the most frequent cause of urethritis; [[Chlamydia trachomatis]] is the most common among them.
Urethritis may be caused by either infectious or non-infectious causes. Infectious causes are divided into gonorrheal and non-gonorrheal. Non-gonorrheal pathogens are the most common cause of urethritis; [[Chlamydia trachomatis|''Chlamydia trachomatis'']] is the most common among them.


==Differentiating Urethritis from Other Diseases==
==Differentiating Urethritis from Other Diseases==
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==Epidemiology and Demographics==
==Epidemiology and Demographics==
[[Chlamydia]] and [[gonorrhea]] are the most commonly reported diseases to the US Centers for Disease Control and Prevention ([[CDC]]). Worldwide, there are approximately 78 million cases of [[gonorrhea]] and 131 million cases of [[chlamydia]] annually.
Urethritis is the cause of several millions of healthcare visits in the United States. ''[[Chlamydia trachomatis]]'' is the most common reportable [[disease]] in the US. In 2014, a total of 350,062 [[gonorrhea]] cases were reported to the CDC in the US. Based on The National Health and Nutrition Examination Survey, the overall [[prevalence]] of [[chlamydia]] among persons aged 14–39 years was 1.7% during 2007-2012. Urethritis has a very good [[prognosis]] with proper [[treatment]]. [[Mortality]] is very uncommon in [[patients]] with [[Gonorrhea|gonococcal]] and [[non-gonococcal urethritis]]. Almost two-thirds of [[chlamydia]] [[infections]] occur among youths aged 15-24 years. The highest [[prevalence]] rates of [[Gonorrhea|gonococcal]] urethritis were found in ages 20 to 24 years both in men and women. In 2014, the overall rate of [[chlamydia]] [[infection]] in the United States among women was 627.2 cases per 100,000 females, over two times the rate among men (278.4 cases per 100,000 males). In 2014, the [[incidence]] of [[gonorrhea]] in the United States was reported as 120 cases per 100,000 males, while it was reported as 100 cases per 100,000 [[females]].
===Incidence===
*'''[[Chlamydia trachomatis]]''' is the most commonly reported disease in the United States. 1,441,789 [[chlamydia]] infections were reported to the [[CDC]] in 2014, which corresponds to a rate of 456.1 cases per 100,000 individuals.
*'''[[Gonorrhea]]:'''  In 2014, a total of 350,062 cases of [[gonorrhea]] were reported in the United States, and the national [[gonorrhea]] rate increased to 110.7 cases per 100,000 individuals in the United States.
 
===Gender===
*'''[[Chlamydia trachomatis]]:''' In 2014, the overall rate of [[chlamydia]] infection in the United States among women (627.2 cases per 100,000 females) was over two times the rate among men (278.4 cases per 100,000 males).
*'''[[Gonorrhea]]:''' In 2014, the incidence of [[gonorrhea]] in the United States was reported as 120 cases per 100,000 males and 100 cases per 100,000 females.
 
===Age===
*'''[[Chlamydia trachomatis]]:''' Almost two-thirds of [[chlamydia]] infections occur among youths aged 15-24 years.
*'''[[Gonorrhea]]:''' The highest prevalence rates were observed in individuals between the ages of 20 and 24 years. This was consistent in both men and women.
 
===Race===
*'''[[Chlamydia trachomatis]]:''' In 2014, the [[chlamydia]] rate in the African-American population in the United States was 6 times the rate in Caucasians, and the rate among American Indians/Alaska Natives was almost 4 times the rate among Caucasians.
*'''[[Gonorrhea]]:''' In 2014, the rate of reported [[gonorrhea]] cases remained highest among African-Americans (405.4 cases per 100,000 individuals). The rate among African-Americans was 10.6 times higher than the rate among Caucasians (reported cases of gonorrhea among Caucasians was 38.3 cases per 100,000 individuals). The [[gonorrhea]] rate among American Indians/Alaska Natives was 159.4 cases per 100,000 population, 4.2 times that of Caucasians.


==Risk Factors==
==Risk Factors==
The most important risk factor in developing urethritis is unprotected sex, especially among men who have sex with men. Other risk factors include:
The most potent [[risk factor]] for urethritis is unprotected sex, especially among men who have sex with men. Other risk factors include low socioeconomic status, history of [[sexually transmitted diseases]], and multiple sex partners.
*Low socioeconomic status
*Prior or current STD
*New or multiple sex partners
*Circumcision
 
==Screening==
==Screening==
According to the U.S. Preventive Service Task Force ([[USPSTF]]), all sexually active women aged under 25 years and over 25 years with increased risk should undergo screening. Factors that increase risk include:
High-risk individuals should be screened for [[sexually transmitted diseases]]. The U.S. Preventive Service Task Force ([[USPSTF]]) developed recommendations for the screening of for [[Chlamydia trachomatis|''Chlamydia trachomatis'']] and [[N. gonorrhea|''N. gonorrhea'']].
*Prior history of [[sexually transmitted infection]]
==Natural History, Complications, and Prognosis==
*A new sex partner
Urethritis has a good prognosis and most patients are treated with appropriate [[antibiotics]]. If left untreated, it can resolve within 3 months in 95% of people with [[Gonorrhea|gonococcal]]<nowiki/>urethritis. The symptoms of [[nongonococcal urethritis]] generally abate within 3 months in 30-70% of untreated people. Rarely, complications such as [[epididymitis]], [[prostatitis]], [[urethral stricture]], chronic [[gonorrhea]] carrier state, may occur.
*More than one sex partner
*A sex partner who has a [[sexually transmitted infection]]
 
==Natural History, Complications, and Prognosis==  
If left untreated, urethritis will resolve within 3 months in 95% of patients. The symptoms of [[non-gonococcal urethritis]] generally abate within 3 months in 30% to 70% of untreated people.<ref>{{cite book |last = Bennett |first = John |title = Mandell, Douglas, and Bennett's principles and practice of infectious diseases |publisher = Elsevier/Saunders |location = Philadelphia, PA |year = 2015 |isbn=9781455748013}}</ref>
Prolonged asymptomatic [[Urethra|urethral]] carriage of gonococci occurs in 2% to 3% of newly infected men if left untreated.
 
Common complications of urethritis include:
*[[Epididymitis|Acute epididymitis]]  
*[[Prostatitis]]
**It occurs In 20% to 30% of men with non-gonorrheal urethritis (NGU); however, it is usually asymptomatic and responds to standard therapy.
*Urethral stricture
**Gonorrhea may cause urethral stricture.
*Oculogenital syndrome
**[[Conjunctivitis]] and non-gonorrheal urethritis (NGU) may be seen in approximately 4% of patients with urethritis.


==Diagnosis==
==Diagnosis==
===Diagnostic Study of Choice===
===Diagnostic Study of Choice===
Urethritis is primarily [[diagnosed]] based on [[symptoms]], [[signs]] of  [[urethral]] [[inflammation]] and [[microscopic]] findings. Symptoms may comprise of [[dysuria]], [[urethral pruritus]], burning, [[Signs]] of  [[urethral]] [[inflammation]] include urethral discharge, which can be mucoid, mucopurulent, or purulent. [[Microscopic]] findings in gonorrheal urethritis include, identification of  [[gram-negative]] [[intracellular]] [[diplococci]] ([[GNID]]) or purple [[intracellular]] [[diplococci]] on [[methylene blue]], or [[gentian violet]] stain. Presence of Invaded [[epithelial cells]], [[vacuoles]] that contain multiple [[organisms]] and >2 [[WBC]] per oil immersion field. Nongonococcal urethritis (NGU) is [[microscopically]] characterized by [[signs]] of [[inflammation]] with absence of [[gram-negative]] [[intracellular]] [[diplococci]]. If [[symptoms]] are present but no evidence of [[urethral]] [[inflammation]] is present, Nucleic Acid [[Amplification Tests]] (NAATs) for [[C. trachomatis]] and [[N. gonorrhoeae]] might identify [[infections]].
===History and Symptoms===
===History and Symptoms===
A detailed history must be taken, with particular emphasis on sexual activity. Specific areas of focus when obtaining a history from the patient include:
A detailed history, particularly with regard to [[sexual]] activity, must be taken. Symptoms suggestive for urethritis include [[dysuria]] and urethral [[discharge]].
*Recent sexual activities
History should specifically include,  recent sexual activities, number of sex partners, or any new partner, use of condoms, history of prior [[STD]]s, and history of recent urethral instrumentation (e.g., urethral [[catheters]]).
*Number of sex partners or any new partner
*Use of condoms
*History of prior [[STD]]s
*History of recent urethral instrumentation (e.g., urethral [[catheters]])


===Symptoms===
===Symptoms===
*Symptoms suggestive of urethritis include [[dysuria]] and [[urethral discharge]].
[[Symptoms]] suggestive of urethritis include [[dysuria]] and [[urethral discharge]].


===Physical Examination===
===Physical Examination===
*The most common physical finding in urethritis is [[urethral discharge]]. The entire genital area must be examined in order to rule out other possibilities.
The most common physical finding in urethritis is [[urethral discharge]]. The entire [[genital area]] must be examined in order to rule out other possibilities. [[Patients]] should be examined for [[Inguinal region|inguinal]] [[lymphadenopathy]], [[ulcers]], and [[urethral discharge]].
*Patients should be examined for [[Inguinal region|inguinal]] [[lymphadenopathy]], [[ulcers]], and [[urethral discharge]].


===Laboratory Findings===
===Laboratory Findings===
Urethritis may be considered on the basis of any of the following:
Urethritis may be considered on the basis of any of the following, mucoid, [[mucopurulent]], or [[purulent]] discharge on [[examination]], [[gram staining|Gram stain]] of urethral [[secretions]] demonstrating ≥2 [[WBC]] per field, positive [[leukocyte]] [[esterase]] test on first-void urine or [[microscopic]] [[examination]] of sediment from a spun first-void [[urine]] demonstrating ≥10 [[WBC]] per high power field.
*Mucoid, [[mucopurulent]], or [[purulent]] discharge on examination
*[[Gram staining|Gram stain]] of urethral secretions demonstrating ≥2 [[WBC]] per field  
*Positive [[leukocyte]] [[esterase]] test on first-void urine or microscopic examination of sediment from a spun first-void urine demonstrating ≥10 [[WBC]] per high power field.


=== Electrocardiogram ===
=== Electrocardiogram ===
There are no [[ECG]] findings associated with urethritis.


=== X-ray ===
=== X-ray ===
There are no [[x-ray]] findings associated with urethritis.


=== Echocardiography and Ultrasound ===
=== Echocardiography and Ultrasound ===
There are no [[echocardiography]]/[[ultrasound]] findings associated with urethritis.


=== CT scan ===
=== CT scan ===
There are no [[CT]] [[scan]] findings associated with urethritis.


=== MRI ===
=== MRI ===
There are no [[MRI]] findings associated with urethritis.


=== Other Imaging Findings ===
=== Other Imaging Findings ===
There are no other [[imaging]] findings associated with urethritis.


=== Other Diagnostic Studies ===
=== Other Diagnostic Studies ===
There are no additional [[diagnostic]] findings for urethritis.


==Treatment==
==Treatment==
===Medical Therapy===
===Medical Therapy===
The preferred [[antibiotic]] regimen depends on the [[etiologic]] pathogen.
Once the diagnosis is confirmed, the appropriate [[antibiotic]] regimen should be initiated to reduce the risk of complications. [[Doxycycline]] 100 mg PO bid for 7 days is administered to treat [[Non-gonococcal urethritis|Non-gonococcal Urethritis]], as an alternative therapy [[azithromycin]] 1 g PO in a single dose or [[azithromycin]] 500 mg orally in a single dose; then 250 mg orally daily for 4 days is recommended. For gonococcal urethritis, [[ceftriaxone]] 500 mg IM in a single dose (for [[patients]] weighing ≥150 kg (300 lbs) [[ceftriaxone]] 1 g IM in a single dose), for alternate therapy [[gentamicin]] 240 mg PO in a single dose plus [[azithromycin]] 2 g PO in a single dose, or cefixime 800 mg PO in a single dose is recommended. [[Metronidazole]] 2 g PO in a single dose is used for patients with recurrent and persistent urethritis. Following treatment, patients should be instructed to return for evaluation if symptoms persist or recur after completion of therapy. Providers should be alert to the possibility of chronic [[prostatitis]]/chronic pelvic pain syndrome in male patients experiencing persistent pain ([[perineal]], penile, or [[pelvic]]), discomfort, irritating voiding symptoms, pain during or after ejaculation, or new onset premature ejaculation lasting for >3 months. All sex partners within the preceding 60 days should be referred for evaluation, testing, and empiric treatment with a drug regimen effective against [[Chlamydia]]. Clinicians must report both [[chlamydia]] and [[gonorrhea]] to health departments.
*'''Gonorrheal urethritis:''' [[Ceftriaxone]] 250 mg IM in a single dose '''PLUS''' [[Azithromycin]] 1 g PO in a single dose
*'''Non-gonorrheal urethritis:''' [[Azithromycin]] 1 g PO in a single dose '''OR''' [[Doxycycline]] 100 mg PO bid for 7 days


===Interventions===
===Interventions===
There are no recommended therapeutic interventions for the management of urethritis.
===Surgery===
===Surgery===
Surgical intervention is not recommended for the management of urethritis.
===Primary Prevention===
===Primary Prevention===
Effective measures for the primary prevention of urethritis include:
Effective measures for the [[primary prevention]] of urethritis include limiting the number of sex partners and using condoms.
*Educating adolescents about safe sex practices
*Practicing abstinence
*Using condoms
*Limiting the number of sex partners


===Secondary Prevention===
===Secondary Prevention===
In order to prevent transmission to partners and decrease the risk of [[antibiotic resistance]], all patients must be instructed on guidelines for safe sex practice, and have screening tests done following treatment.
In order to prevent transmission to one's partner and decrease the risk of [[antibiotic resistance]], all patients must be instructed on safe sex practices and screening requirements after treatment.


==References==
==References==
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{{Reflist|2}}
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Latest revision as of 16:08, 27 August 2021

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Seyedmahdi Pahlavani, M.D. [2]

Overview

Urethritis is due to inflammation of the urethra. Based on etiology it is classified into two main groups, infectious and non-infectious. Infectious causes are further classified into gonorrheal and non-gonorrheal. Urethritis is an inflammation of the genital tract that is mostly due to infectious causes. Its pathogenesis depends on the causative pathogen. Microscopic findings for gonococcal urethritis include, presence of gram-negative intracellular diplococci (GNID), invaded epithelial cells, vacuoles that contain multiple organisms, and >2 WBC per oil immersion field. Nongonococcal urethritis (NGU) is [[microscopically characterized by signs of inflammation with absence of gram-negative intracellular diplococci. If symptoms are present but no evidence of urethral inflammation is present, Nucleic Acid Amplification Tests (NAATs) for C. trachomatis and N. gonorrhoeae might identify infections.The most potent risk factor for urethritis is unprotected sex, especially among men who have sex with men. Other risk factors include low socioeconomic status, history of sexually transmitted diseases, and multiple sex partners. Urethritis is primarily diagnosed based on symptoms, signs of urethral inflammation and microscopic findings. Symptoms may comprise of dysuria, urethral pruritus, burning, Signs of urethral inflammation include urethral discharge, which can be mucoid, mucopurulent, or purulent. Microscopic findings in gonorrheal urethritis include, identification of gram-negative intracellular diplococci (GNID) or purple intracellular diplococci on methylene blue, or gentian violet stain. Presence of Invaded epithelial cells, vacuoles that contain multiple organisms and >2 WBC per oil immersion field. Nongonococcal urethritis (NGU) is microscopically characterized by signs of inflammation with absence of gram-negative intracellular diplococci. If symptoms are present but no evidence of urethral inflammation is present, Nucleic Acid Amplification Tests (NAATs) for C. trachomatis and N. gonorrhoeae might identify infections.Once the diagnosis is confirmed, the appropriate antibiotic regimen should be initiated to reduce the risk of complications. Doxycycline 100 mg PO bid for 7 days is administered to treat Non-gonococcal Urethritis, as an alternative therapy azithromycin 1 g PO in a single dose or azithromycin 500 mg orally in a single dose; then 250 mg orally daily for 4 days is recommended. For gonococcal urethritis, ceftriaxone 500 mg IM in a single dose (for patients weighing ≥150 kg (300 lbs) ceftriaxone 1 g IM in a single dose), for alternate therapy gentamicin 240 mg PO in a single dose plus azithromycin 2 g PO in a single dose, or cefixime 800 mg PO in a single dose is recommended.

Historical Perspective

The first known case of urethritis was described by Albert Neisser, a German doctor, in 1879. In 1904, Ludwig Waelsch described mild non-gonococcal urethritis (NGU). In the 1930s and later, Philip Thygeson and others in the United States confirmed the vertical transmission of nongonococcal urethritis (NGU). 

Classification

Urethritis is classified into two main groups of infectious and non-infectious based on the etiology. Infectious causes are further classified into gonorrheal and non-gonorrheal.

Pathophysiology

Urethritis is an inflammation of the genital tract that is mostly due to infectious causes. Its pathogenesis depends on the causative pathogen. N. gonorrhea is usually transmitted via the genital tract to the human host. Following attachment to host cell, which is mediated by piligonococci become engulfed in a process known as parasite-directed endocytosis. This organism will survive inside the vacuoles and replicate. Among non-gonorrheal causes, Chlamydia trachomatis is the most common. The infectious process begins with cell surface attachment and phagocytosis by the host cell. The pathogen survives inside the cell by debilitating the cellular lysosomes and replicating as elementary bodies which is considered as the infective form of the pathogen. Microscopic findings for gonococcal urethritis include, presence of gram-negative intracellular diplococci (GNID), invaded epithelial cells, vacuoles that contain multiple organisms, and >2 WBC per oil immersion field. Nongonococcal urethritis (NGU) is microscopically characterized by signs of inflammation with absence of gram-negative intracellular diplococci.

Causes

Urethritis may be caused by either infectious or non-infectious causes. Infectious causes are divided into gonorrheal and non-gonorrheal. Non-gonorrheal pathogens are the most common cause of urethritis; Chlamydia trachomatis is the most common among them.

Differentiating Urethritis from Other Diseases

Urethritis must be differentiated from other causes of dysuria and urethral discharge, which include acute cystitis, epididymitis, prostatitis, cervicitis, and vulvovaginitis.

Epidemiology and Demographics

Urethritis is the cause of several millions of healthcare visits in the United States. Chlamydia trachomatis is the most common reportable disease in the US. In 2014, a total of 350,062 gonorrhea cases were reported to the CDC in the US. Based on The National Health and Nutrition Examination Survey, the overall prevalence of chlamydia among persons aged 14–39 years was 1.7% during 2007-2012. Urethritis has a very good prognosis with proper treatment. Mortality is very uncommon in patients with gonococcal and non-gonococcal urethritis. Almost two-thirds of chlamydia infections occur among youths aged 15-24 years. The highest prevalence rates of gonococcal urethritis were found in ages 20 to 24 years both in men and women. In 2014, the overall rate of chlamydia infection in the United States among women was 627.2 cases per 100,000 females, over two times the rate among men (278.4 cases per 100,000 males). In 2014, the incidence of gonorrhea in the United States was reported as 120 cases per 100,000 males, while it was reported as 100 cases per 100,000 females.

Risk Factors

The most potent risk factor for urethritis is unprotected sex, especially among men who have sex with men. Other risk factors include low socioeconomic status, history of sexually transmitted diseases, and multiple sex partners.

Screening

High-risk individuals should be screened for sexually transmitted diseases. The U.S. Preventive Service Task Force (USPSTF) developed recommendations for the screening of for Chlamydia trachomatis and N. gonorrhea.

Natural History, Complications, and Prognosis

Urethritis has a good prognosis and most patients are treated with appropriate antibiotics. If left untreated, it can resolve within 3 months in 95% of people with gonococcalurethritis. The symptoms of nongonococcal urethritis generally abate within 3 months in 30-70% of untreated people. Rarely, complications such as epididymitis, prostatitis, urethral stricture, chronic gonorrhea carrier state, may occur.

Diagnosis

Diagnostic Study of Choice

Urethritis is primarily diagnosed based on symptoms, signs of urethral inflammation and microscopic findings. Symptoms may comprise of dysuria, urethral pruritus, burning, Signs of urethral inflammation include urethral discharge, which can be mucoid, mucopurulent, or purulent. Microscopic findings in gonorrheal urethritis include, identification of gram-negative intracellular diplococci (GNID) or purple intracellular diplococci on methylene blue, or gentian violet stain. Presence of Invaded epithelial cells, vacuoles that contain multiple organisms and >2 WBC per oil immersion field. Nongonococcal urethritis (NGU) is microscopically characterized by signs of inflammation with absence of gram-negative intracellular diplococci. If symptoms are present but no evidence of urethral inflammation is present, Nucleic Acid Amplification Tests (NAATs) for C. trachomatis and N. gonorrhoeae might identify infections.

History and Symptoms

A detailed history, particularly with regard to sexual activity, must be taken. Symptoms suggestive for urethritis include dysuria and urethral discharge. History should specifically include, recent sexual activities, number of sex partners, or any new partner, use of condoms, history of prior STDs, and history of recent urethral instrumentation (e.g., urethral catheters).

Symptoms

Symptoms suggestive of urethritis include dysuria and urethral discharge.

Physical Examination

The most common physical finding in urethritis is urethral discharge. The entire genital area must be examined in order to rule out other possibilities. Patients should be examined for inguinal lymphadenopathy, ulcers, and urethral discharge.

Laboratory Findings

Urethritis may be considered on the basis of any of the following, mucoid, mucopurulent, or purulent discharge on examination, Gram stain of urethral secretions demonstrating ≥2 WBC per field, positive leukocyte esterase test on first-void urine or microscopic examination of sediment from a spun first-void urine demonstrating ≥10 WBC per high power field.

Electrocardiogram

There are no ECG findings associated with urethritis.

X-ray

There are no x-ray findings associated with urethritis.

Echocardiography and Ultrasound

There are no echocardiography/ultrasound findings associated with urethritis.

CT scan

There are no CT scan findings associated with urethritis.

MRI

There are no MRI findings associated with urethritis.

Other Imaging Findings

There are no other imaging findings associated with urethritis.

Other Diagnostic Studies

There are no additional diagnostic findings for urethritis.

Treatment

Medical Therapy

Once the diagnosis is confirmed, the appropriate antibiotic regimen should be initiated to reduce the risk of complications. Doxycycline 100 mg PO bid for 7 days is administered to treat Non-gonococcal Urethritis, as an alternative therapy azithromycin 1 g PO in a single dose or azithromycin 500 mg orally in a single dose; then 250 mg orally daily for 4 days is recommended. For gonococcal urethritis, ceftriaxone 500 mg IM in a single dose (for patients weighing ≥150 kg (300 lbs) ceftriaxone 1 g IM in a single dose), for alternate therapy gentamicin 240 mg PO in a single dose plus azithromycin 2 g PO in a single dose, or cefixime 800 mg PO in a single dose is recommended. Metronidazole 2 g PO in a single dose is used for patients with recurrent and persistent urethritis. Following treatment, patients should be instructed to return for evaluation if symptoms persist or recur after completion of therapy. Providers should be alert to the possibility of chronic prostatitis/chronic pelvic pain syndrome in male patients experiencing persistent pain (perineal, penile, or pelvic), discomfort, irritating voiding symptoms, pain during or after ejaculation, or new onset premature ejaculation lasting for >3 months. All sex partners within the preceding 60 days should be referred for evaluation, testing, and empiric treatment with a drug regimen effective against Chlamydia. Clinicians must report both chlamydia and gonorrhea to health departments.

Interventions

There are no recommended therapeutic interventions for the management of urethritis.

Surgery

Surgical intervention is not recommended for the management of urethritis.

Primary Prevention

Effective measures for the primary prevention of urethritis include limiting the number of sex partners and using condoms.

Secondary Prevention

In order to prevent transmission to one's partner and decrease the risk of antibiotic resistance, all patients must be instructed on safe sex practices and screening requirements after treatment.

References

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