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Dysuria is a common symptom in children and adolescents that can be defined as the feeling of pain, burning or discomfort upon urination. Dysuria is usually caused by a urinary tract infection that involves the urethra, i.e., urethritis, but the possibility of a sexually transmitted disease should not be excluded in any adolescent girl who is sexually active. Urethritis is a lower urinary tract infection that is usually not associated with systemic symptoms.
Epidemiology of Urethritis in Adolescent Girls
Sexually transmitted diseases are common in adolescent girls for several reasons. Firstly, almost half of high school students have had at least one sexual encounter and up to one-fifth of adolescent girls have had more than four sexual partners. The use of condoms is less likely among adolescent girls compared to adults as only half of the sexually active adolescent girls used a condom.
Additionally, adolescent girls are more likely to have a sexual encounter with a male or female partner whose medical history might be unknown. Because of this behavior, the incidence of chlamydia is twice as high among adolescent girls compared to female adults. The estimated prevalence of chlamydia among adolescent girls is around 13 to 16 % whereas the prevalence of gonorrhea is 2 to 10 %.
Clinical Presentation of Urethritis in Adolescent Girls
Differentiation between urethritis caused by a sexually transmitted infection and a urinary tract infection based on the clinical presentation is difficult. Sexually transmitted infections such as chlamydia and gonorrhea are very common in sexually active adolescent girls, and they usually present with symptoms and signs of a lower urinary tract infection, i.e., urethritis.
Such differentiation, however, between sexually transmitted infections and simple urinary tract infections, is essential as the treatment might differ. Chlamydial infections cause dysuria that is more commonly associated with abdominal pain, vaginal discharge and vaginal bleeding. Gonorrhea can also present in a similar way to chlamydia, but it is more likely to cause proctitis or a swelling over the labia minora due to an abscess of Bartholin’s gland.
On the other hand, urethritis due to urinary tract infections is usually associated with urgency, increased frequency and gross hematuria. Abdominal pain, vaginal discharge and vaginal bleeding are uncommon in simple cases of urethritis. A low-grade fever is more commonly seen in cases of sexually transmitted infections than in urinary tract infections.
Diagnostic Workup for Urethritis in Adolescent Girls
Adolescent girls with dysuria should be always offered an external exam of the genitalia to exclude common causes of dysuria such as herpes simplex. If vesicles are present, the treating physician should inquire about other common symptoms of herpes infection such as fever, malaise, headache and muscle pain. A Tzanck test of the vesicle base can provide an immediate confirmation of herpes simplex infection.
Less commonly, the genitalia examination might reveal a chancroid. Chancroids are also painful and can be associated with symptoms and signs suggestive of urethritis. Gram or Giemsa stain of the fluid from the chancroid can confirm the diagnosis.
Girls with symptoms and signs suggestive of a chlamydial infection should undergo a pelvic examination to confirm the diagnosis. Friability of the cervix, cervical motion tenderness and the presence of mucopus are all diagnostic of chlamydia. Additionally, the use of urinary ligase chain reaction tests, when coupled with a swab of the vaginal vault examination, can be enough for establishing the diagnosis of chlamydia. Gene amplification tests, i.e., polymerase chain reaction assays, can also confirm the diagnosis of chlamydia or gonorrhea in an adolescent girl with dysuria.
Adolescent girls who have abdominal pain, cervical motion tenderness and adnexal tenderness are very likely to have pelvic inflammatory disease. This condition puts the girl at an increased risk of infertility and a diagnostic laparoscopy might be indicated. C-reactive protein and the erythrocyte sedimentation rate are also elevated in adolescent girls with pelvic inflammatory disease. C-reactive protein levels can be also used to monitor response to treatment as they usually fall to normal limits if treatment was successful.
Urinary dipstick examination can show a positive leukocyte esterase result in urethritis due to the simple urinary tract, chlamydial or gonorrheal infections. The presence of nitrites in the urine is suggestive of a urinary tract infection.
The most commonly identified organism in cases of urinary tract infections in adolescent girls is staphylococcus saprophytic. The presence of pyuria, which is defined as the presence of 8 or more white blood cells per high-power field on the microscopic examination of urine, is also suggestive of urethritis. Pyuria does not differentiate between urinary tract infections and sexually transmitted infections. Microscopic examination with a gram stain can help in confirming the diagnosis especially if a single organism was seen. The presence of intracellular gram-negative diplococci on urine microscopy is pathognomonic of gonorrheal urethritis.
Urinary cultures should not be routinely performed. Complicated cases of urinary tract infections, failure to respond to antibiotic therapy within 48 hours or recurrent cases of urinary tract infections in adolescent girls should undergo a urine sample collection and culture to determine the sensitivity profile of the offending organism.
Treatment of Urethritis in Adolescent Girls
The treatment of urethritis in an adolescent girl depends on whether the most likely etiology is a sexually transmitted infection or not. Cases of uncomplicated urethritis or cystitis due to urinary tract infections usually respond to a three-day course of trimethoprim-sulfamethoxazole, ciprofloxacin, ofloxacin or another fluoroquinolone.
Adolescent girls who are found to have chlamydial or gonorrheal urethritis should receive dual therapy against the two organisms because the risk of co-infection is very high. The antibiotics of choice for the management of chlamydial and gonorrheal uncomplicated cases of urethritis are doxycycline and azithromycin plus ceftriaxone. A single dose of intramuscular ceftriaxone when combined with a single dose of azithromycin is usually sufficient for the treatment of uncomplicated gonococcal infections. Doxycycline is usually used twice a day for seven days.