GUM + Breast Flashcards
What is bacterial vaginosis?
An overgrowth of bacteria in the vagina, specifically anaerobic bacteria. It is not a sexually transmitted infection. It is caused by a loss of the lactobacilli “friendly bacteria” in the vagina causing an increase in pH. Bacterial vaginosis can increase the risk of women developing sexually transmitted infections. It is the most common cause of abnormal vaginal discharge in women of childbearing age.
What is the pathophysiology of BV?
Lactobacilli are the main component of the healthy vaginal bacterial flora. These bacteria produce lactic acid that keeps the vaginal pH low (under 4.5). The acidic environment prevents other bacteria from overgrowing. When there are reduced numbers of lactobacilli in the vagina, the pH rises. This more alkaline environment enables anaerobic bacteria to multiply.
Which bacteria cause BV?
Gardnerella vaginalis (most common)
Mycoplasma hominis
Prevotella species
What are the RF for BV?
Sexual activity – particularly a new partner or multiple sexual partners
The use of a contraceptive intrauterine device (IUD)
Receptive oral sex
Presence of an STI
Vaginal douching, or the use of scented soaps/vaginal deodorant
Recent antibiotic use
Ethnicity – more common in black women
Smoking
Women who have sex with women are more at risk due to shared vaginal flora patterns.
What are the clinical features of BV?
Fishy-smelling (especially after sex) watery grey or white homogenous vaginal discharge. Half of women with BV are asymptomatic.
Itching, irritation and pain are not typically associated with BV and suggest an alternative cause or co-occurring infection.
How is BV investigated and diagnosed? What criteria is used?
the Amstel criteria are often used. Three out of four features are needed to confer a diagnosis:
Vaginal pH >4.5
Homogenous grey or milky discharge
Positive whiff test (addition of 10% potassium hydroxide produces fishy odour)
Clue cells present on wet mount
What are clue cells?
Clue cells are epithelial cells from the cervix that have bacteria stuck inside them, usually Gardnerella vaginalis.
Microscopy may also show reduced numbers of lactobacilli and absence of pus cells
How is BV managed?
Asymptomatic does not require treatment
Metronidazole specifically targets anaerobic bacteria. This is given orally, or by vaginal gel. Clindamycin is an alternative but less optimal antibiotic choice.
Assess for additional infections, educate about how to reduce BV in the future and remind patients about how you can’t drink with Metronidazole. It causes “disulfiram-like reaction”, with nausea and vomiting, flushing and sometimes severe symptoms of shock and angioedema.
What does BV in pregnancy increase risks of and how is it managed?
Untreated symptomatic BV can increase the risk of pregnancy-related complications such as premature birth or rupture of membranes, miscarriage and chorioamnionitis, low birth weight and postpartum endometritis.
Treatment is the same as for non-pregnant women however if receiving treatment following birth, lactating women are advised to be treated with lower doses of metronidazole which can affect the taste of the breast milk.
What is vaginal candidiasis?
It refers to vaginal infection with a yeast of the Candida family. The most common is Candida albicans.
Candida may colonise the vagina without causing symptoms. It then progresses to infection when the right environment occurs, for example, during pregnancy or after treatment with broad-spectrum antibiotics that alter the vaginal flora.
What are the RF for thrush?
Pregnancy
Diabetes
Use of broad spectrum antibiotics- alters normal vaginal micro-biota
Use of corticosteroids - immunosuppressive action of corticosteroids can allow commensal candida the opportunity to thrive excessively.
Immunosuppression or compromised immune system
For example in HIV or cancer patients.
How does thrush present?
itching, white curdy or lumpy discharge, non-offensive or sour milk odour, dysuria, superficial dyspareunia, pruritus, tenderness, burning sensation
Examination - redness, fissuring, swelling, intertrigo, thick white discharge, satellite lesions (red, pustular lesions with superficial white/creamy pseudomembranous plaques that can be scraped off)
How is thrush diagnosed?
If uncomplicated then can give empiracal treatment.
Testing the vaginal pH using a swab and pH paper can be helpful in differentiating between bacterial vaginosis and trichomonas (pH > 4.5) and candidiasis (pH < 4.5).
A charcoal swab with microscopy can confirm the diagnosis. May show spores and mycelia which are indicative of candida infection but it is commensal in a lot of women so not always cause of symptoms
How is thrush managed?
Oral (-azoles) e.g. fluconazole, itraconazole
Intravaginal e.g. clotrimazole pessary
Vulval e.g. topical clotrimazole cream
Canesten Duo is a standard over-the-counter treatment worth knowing. It contains a single fluconazole tablet and clotrimazole cream to use externally for vulval symptoms. Cream can damage condoms and diaphragms so need to use alternative contraception for at least 5 days
Recurrent infections (more than 4 in a year) can be treated with an induction and maintenance regime over six months with oral or vaginal antifungal medications.
Why is thrush more common in pregnancy?
By stimulating increased glycogen production, this provides a more favourable environment for microorganisms to thrive. It is also thought that oestrogen may have a direct influence on the candida organism by promoting its growth and encouraging it to ‘stick’ to the walls of the vagina.
How is thrush treated in pregnancy?
Treat infection with intravaginal antifungal (e.g. clotrimazole)
Do not give oral antifungals such as fluconazole and itraconazole
Treat vulval symptoms with topical antifungal
Advise the patient to be careful to avoid physical damage when inserting intravaginal treatment applicator
Return if symptoms have not resolved within 7-14 days
What is chlamydia?
Chlamydia trachomatis is a gram-negative bacteria. It is an intracellular organism, meaning it enters and replicates within cells before rupturing the cell and spreading to others. Chlamydia is the most common sexually transmitted infection in the UK and a significant cause of infertility.
How does the national chlamydia screening programme work?
aims to screen every sexually active person under 25 years of age for chlamydia annually or when they change their sexual partner. Everyone that tests positive should have a re-test three months after treatment. This re-testing is to ensure they have not contracted chlamydia again, rather than to check the treatment has worked.
In general, when a patient attends a GUM clinic for STI screening, as a minimum, they are tested for:
Chlamydia
Gonorrhoea
Syphilis (blood test)
HIV (blood test)
How does chlamydia present?
Asymptomatic
Abnormal vaginal discharge
Pelvic pain
Abnormal vaginal bleeding (intermenstrual or postcoital)
Painful sex (dyspareunia)
Painful urination (dysuria)
Men:
Urethral discharge or discomfort
Dysuria
Epididymo-orchitis
Reactive arthritis
NB. consider anal chlamydia or LV when someone has anorectal symptoms, such as discomfort, discharge, bleeding and change in bowel habits.
What are the clinical findings of chlamydia on examination?
Pelvic or abdominal tenderness
Cervical motion tenderness (cervical excitation)
Inflamed cervix (cervicitis)
Purulent discharge
In men:
Epididymal tenderness
Mucopurulent discharge
What are the Ix for chlamydia?
nucleic acid amplification test (NAAT):
Women: Vulvo-vaginal swab (first choice), endocervical swab or first catch urine sample.
Men: first catch urine sample (first choice) or urethral swab.
If indicated, swabs may also need to be taken from the rectum, eye(s) and throat.
Patients recommended to have full STI screen to check for co-infection
How is chlamydia managed?
Doxycycline 100mg 2x day for 7 days, abstain during treatment, contact tracing, screen and treat other STIs, advise on how to prevent in the future and screen for safeguarding and abuse
Contraindicated in pregnancy and breastfeeding, other options are azithromycin, erythromycin or amoxicillin
Test of cure only needed if rectal, pregnant or persistant symptoms
What are the complications of chlamydia?
Pelvic inflammatory disease
Chronic pelvic pain
Infertility
Ectopic pregnancy
Epididymo-orchitis
Conjunctivitis
Lymphogranuloma venereum
Reactive arthritis
Pregnancy-related complications include:
Preterm delivery
Premature rupture of membranes
Low birth weight
Postpartum endometritis
Neonatal infection (conjunctivitis and pneumonia)
What infections do the different serotypes of chlamydia cause?
Serotypes A-C – cause ocular infection.
Serotypes D-K – responsible for classical genitourinary infection.
Serotypes L1-L3 – cause lymphogranuloma venereum (LGV), an emerging infection in men who have sex with men, often resulting in proctitis.