Syphilis Flashcards

1
Q

What is primary syphilis

A

occurs 3-4 wks post exposure. Painless ulcer (chancre)- clear margins and punched out crater-like appearance. Heals spontaneously without treatment.

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2
Q

What is secondary syphilis?

A

occurs 4-8 weeks post-chancre.
- Maculopapular rash of torso, palms/soles, lymphadenopathy, condylomata lata (painless mucosal warty lesions)

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3
Q

What is tertiary syphilis?

A

occurs 1-10 yrs post-infection.
Gummas (granulomatous lesion), cardiovascular syphilis, vascular anueyrms, tabes dorsalis (degeneration of spinal cord-pain and sensory ataxia), ARgyll-Robinson pupil

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4
Q

What is neurosyphilis?

A

can occur at any time in process. Need IV PCN.

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5
Q

What is RPR?

A

Non-treponemal test. RPR titer at time of initial ddx. 4-fold (1:32 to 1:8 is considered adequate). Early syphilis: check at 6, 12 months. Late syphilis: 6,12,24 months.

Rapid plasma reagin (RPR) - tests for reagin antibodies.

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6
Q

What is latent syphilis?

A

Positive testing with no signs/symptoms. after UNTREATED secondary stage.
Early latent: <1 yr since infection: tx w/ PCN G 2.4million units IM x 1 dose
Late latent> 1 year - PCN G 2.4 million units weekly x 3 doses

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7
Q

What are causes of false positive RPR?

A

Autoimmune disease (SLE), smallpox vaccination, malaria, Pregnancy (1%), malaria, HIV, IV drug use.

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8
Q

What are alternative treatments for syphilis?

A

Doxycycline 100mg BID x14d or ceftriaxone 1g IM/IV x 10-14d.

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9
Q

What are the different serologies for syphilis?

A

Non-specific: VDRL, STS, RPR. screening, +false positives, not permanent. can return to zero but can remain weakly positive for life after treatment.

Specific: fTA-Abs, TPI, TPHA: confirmatory tests. no false positives, permanent.

sero-conversion takes 4-6 weeks.

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10
Q

What are syphilis titers?

A

Generally:
Should get 4-fold decline within 3 months
8-fold decline within 6 months
non-reactive within 1 year
- screening tests may be weakly positive indefinitely

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11
Q

What is the Jarisch-Herxheimer reaction?

A

acute febrile illness (Fever, HA, myalgias, rash).
occurs within 6-8 hrs of treatment with PCN
- often mistaken for PCN allergy
can cause PTL/fetal distress
due to release of toxins from dying spirochetes.

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12
Q

What is treatment for syphilis?

A

penicillin. If pregnant, desensitize since tetracycline contraindicated (yellow teeth) and erythromycin doesn’t adequately treat fetus.

if penicillin sensitive, given erythromycin if not pregnant.

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13
Q

What are the differences between syphilis and chancroid?

A

Syphilis: single, painless, clear margin (crater-like), rubbery painless nodes, treponema palladium

Chancroid: multiple, painful, vague margin, painful nodes, hemophilus ducreyi.

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14
Q

What are sonographic features of in-utero syphilis?

A
  • hepatosplenomegaly
  • intrahepatic calcifications
  • placentomegaly
  • fetal ascites

In severe cases there may be evidence of hydrops

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