SEXUAL HEALTH + GUM TO DO Flashcards
CHLAMYDIA
How would you manage chlamydia?
- Test for other STIs, contraceptive advice, ?safeguarding if child.
- Doxycycline 100mg BD for 7d (C/I pregnancy or breastfeeding).
- 1g azithromycin stat dose in pregnancy (erythromycin or amoxicillin safe too)
- Referral to GUM for partner notification + contact tracing.
GONORRHOEA
What are the systemic complications of gonorrhoea?
- PID
- Gonococcal arthritis (most common cause of septic arthritis in young adults)
- Disseminated gonococcal infection as triad (tenosynovitis, migratory polyarthritis, dermatitis lesions can be maculopapular or vesicular)
GONORRHOEA
What is the management of gonorrhoea?
- 1g single dose IM ceftriaxone (add PO ciprofloxacin 500mg but only if sensitive as high antibiotic resistance)
- Follow-up test of cure with NAAT testing or cultures
- Contact tracing, partner notification, contraceptive advice, ?safeguarding
SYPHILIS
What is the clinical presentation of secondary syphilis?
- Systemic (low grade fever, lymphadenopathy).
- Maculopapular rash (trunk, soles + palms).
- Condylomata lata (grey wart-like lesions around genitals + anus).
- Alopecia
- Buccal ‘snail track ulcers’
SYPHILIS
What is the clinical presentation of tertiary syphilis?
- Gummas (granulomatous lesions that can affect skin, organs + bones)
- Aortic aneurysms
- Neurosyphilis – tabes dorsalis (locomotor ataxia), paralysis, dementia, Argyll-Robertson (prositutes) pupil
SYPHILIS
What investigations would you do for syphilis?
- Treponemal tests (enzyme immunoassay or haemagglutination assay)
- Samples from site of infection tested with dark field microscopy or PCR
SYPHILIS
How would you manage syphilis?
- Specialist GUM (full STI screening, contact tracing, contraceptive information).
- Single dose IM benzathine benzylpenicillin or PO doxycycline if allergic
SYPHILIS
What is a potential adverse effect of treating syphilis?
- Jarisch-Herxheimer reaction within a few hours of treatment
- Fever, rash + tachycardia thought to be due to release of endotoxins following bacterial death
GENITAL HERPES
What other specific symptoms may be seen in genital herpes?
- Aphthous ulcers (small painful oral sores)
- Herpes keratitis (inflammation of the cornea = blue)
- Herpetic whitlow (painful skin lesion on finger/thumb)
GENITAL HERPES
What is the main complication of genital herpes in pregnancy?
Does the foetus have any immunity?
- Neonatal HSV infection as high morbidity + mortality.
- After initial infection woman will produce IgG that cross placenta to give foetus passive immunity + protect during labour + delivery
GENITAL WARTS
What are the investigations for genital warts?
- Clinical diagnosis (may use magnifying glass or colposcope)
- Application of acetic acid/vinegar produces acetowhite changes of surface
- Biopsy if atypical
GENITAL WARTS
How is genital warts managed?
- Prophylaxis with HPV vaccine for 12–13y (may be given to MSM, trans men/women + sex workers)
- Topical podophyllotoxin cream/lotion or cryotherapy.
- GUM contact tracing, contraceptive advice
LICHEN SCLEROSUS
What is the clinical presentation of lichen sclerosus in men?
- Painful erections
- Dyspareunia
- Urinary Sx
- Soreness
HIV
What is HIV?
What is the pathophysiology of HIV?
- RNA retrovirus that encodes reverse transcriptase
- Binds to GP120 envelope glycoprotein to CD4 receptors which migrate to lymphoid tissue where virus replicates + produces billions of new virions
- Reverse transcriptase makes single strand RNA > double stranded DNA + viral DNA is integrated to host cell’s DNA with enzyme integrase + core viral proteins synthesised + cleaved by viral protease
- These then released + in turn infect new CD4 cells
HIV
What are AIDS-defining illnesses?
Give some examples
- All associated with end-stage HIV infection where CD4 count dropped to a level that allows opportunistic diseases to occur.
- Kaposi’s sarcoma, pneumocystis jiroveci pneumonia, cytomegalovirus, candidiasis (oesophageal or bronchial), lymphomas, TB
HIV
What tests can be used to investigation HIV?
- Serum/salivary HIV enzyme-linked immunosorbent assay (ELISA)
- Rapid point of care screening blood test for HIV antibodies
- PCR testing
HIV
Explain the process of HIV ELISA
Can take 3m for HIV Ab detection so confirmatory assay after 3m.
HIV
What are the considerations with HIV and pregnancy?
- Normal vaginal delivery if viral load <50 copies/ml
- Consider c-section if >50, but mandatory in >400
- IV zidovudine 4h before c-section
- Neonatal PO zidovudine if maternal viral load <50 if not triple ART both for 4–6w
- No breastfeeding
HIV
What is the generic management for HIV?
What is the standard therapy?
What is the aim of therapy?
- Specialist HIV, infectious diseases + GUM clinics
- Highly active anti-retrovirus therapy (HAART) with 2 NRTIs + third agent
- Goal to achieve normal CD4 count + undetectable viral load
HIV
What are the 4 main groups of HIV treatment?
- Nucleoside reverse transcriptase inhibitors (NRTIs)
- Protease inhibitors (PIs)
- Integrase inhibitors (IIs)
- Non-nucleoside reverse transcriptase inhibitors (NNRTIs)
HIV
What are some examples of and the mechanism of action of…
i) NRTIs?
ii) PIs?
iii) IIs?
iv) NNRTIs?
i) Zidovudine, tenofovir, emtricitabine – inhibits synthesis of DNA by reverse transcriptase
ii) Indinavir (end –navir) – acts competitively on HIV enzyme involved in production of functional viral proteins
iii) Raltegravir (end –gravir) – inhibits insertion of HIV DNA to genome
iv) Nevirapine – binds directly to + inhibits reverse transcriptase
HIV
What additional management can be given to HIV +ve patients?
- Education about safe sex + condoms, less partners, regular tests.
- Prophylactic co-trimoxazole if CD4 <200 to protect from PCP
- Monitor blood lipids + CVD RFs as increased risk
- Yearly smears for women
- Vaccines up to date but avoid live vaccinations
- Can conceive safely via techniques like sperm washing + IVF
SYPHILIS
What is the causative organism?
Treponema pallidum – spirochete (spiral-shaped) bacteria
CANDIDIASIS
What are some risk factors?
Increased oestrogen (pregnancy, during menstrual years)
poorly controlled DM,
immunosuppression,
broad spectrum Abx