28/3 Flashcards
(34 cards)
Safest antiepileptics to take in preg
lamotrigine, and carbamazepine mono
(although carbamazepine- cleft palate)
Sodium valproate congenital effect
neural tube defects
facial cleft
hypospadias
phenobarbital and phenytoin congenital effect
cardiac malformations
phenytoin - cleft palate
Predicting seizure deterioration in preg
seizure-free duration is the most important factor in assessing the risk of seizure deterioration.
how to test for ntd
Biochemical screening with maternal serum alphafetoprotein when combined with
ultrasonography increases the detection rate for neural tube defects to 94–100%,56 thereby
offering the opportunity to detect these abnormalities in early gestation for WWE.
What is the role of vitamin K in preventing haemorrhagic disease of the newborn and
maternal haemorrhage in WWE taking AEDs?
All babies born to WWE taking enzyme-inducing AEDs should be offered 1 mg of intramuscular
vitamin K to prevent haemorrhagic disease of the newborn.
enzyme inducing antiepileptics
phenytoin, carbamazepine, topiramate and phenobarbital,
BF and antiepileptics
Lamotrigine levetiracetam and topiramate transfer to
a larger extent in breast milk
Sodium valproate, carbamazepine, and phenytoin = minimal transfer.
non-enzyme-inducing AEDs
sodium valproate
levetiracetam
gabapentin
pregabalin
Lamotrigine
Effect on Lamo
CHC
May reduce lamotrigine effectiveness, requiring dose increase (up to two-fold) and serum level monitoring. Continuous CHC use advised to prevent fluctuations.
PO
Watch for lamotrigine toxicity signs (dizziness, ataxia, diplopia). Serum levels may need monitoring when stopping progestogen.
Contraceptive Effectiveness
CHC, POP and IMP may be less effective with lamotrigine—use additional contraception (e.g., condoms).
Depot , IUS, and IUDs unaffected.
AEDs and UKMEC
Enzyme-inducing
CHC 3
POP 3
PO-I 2
DMPA 1
IUD/ IUS 1
So same as any EI
Non enzyme inducing
CHC 1 (other than lamotrigine which is 3!!)
All rest 1
Unless teratogenic like –> Sodium valproate then only implant and coils
When does RPR become positive
Seroconversion 2-4 weeks after exposure
Treponemal Tests tend to become positive then
6 weeks
What are trep and non treps acc looking at
Treponemal Tests:
EIA and TPPA
Detect antibodies against the syphilis bacteria itself, and are generally more sensitive in early infection, remaining reactive indefinitely once positive.
> > Syphilis IgG (Syphilis EIA)
restest in 2 weeks if neg ulcer or high risk
Non-Treponemal Tests:
RPR
Detect antibodies against a substance produced by the body in response to the infection (reagin), and are used to monitor treatment response.
Less specific, and can be elevated due to other conditions, including autoimmune diseases or acute febrile illnesses.
STS TESTING
Biological False Positives:
If only one marker is positive within the range of syphilis screening tests this usually indicates a
false positive test. Discuss with Dr. The patient should be informed and asked to provide a
follow up sample 2 weeks later. If there is no change in the titre this confirms a false positive.
PN STS
In patients with primary syphilis all sexual partners in the past 3 months should be contacted. (50% of contacts of primary infection will also have syphilis)
In patients with secondary or early latent syphilis partner notification should include all
partners in the last 2 years.
Asymptomatic contacts of early syphilis should have serology performed at presentation + 4 and +12wks after last sexual contact with the index case.
(consider epidemiological treatment if unlikely to attend for FU)
STS FU post rx
Early
Rpt sereology following rx
+1month
+ 3,6 and 12 months
then 6 monthly until the RPR is negative or serofast.
RPR should fall by four-fold with in 3-6 / eight-fold with in 6-12 months. Normally comes neg.
15% of individuals with primary / secondary syphilis are expected to fail to show adequate serological response to treatment and may need further investigation.
Late
Falls is slower than above, and although it may
eventually become negative, it may also remain positive at low titre (<16).
Serological follow up is 6 monthly until serofast.
Serology: early syphilis
An RPR >8 and a positive IgM suggest early, active syphilis.
Penicillin desensitisation
BG: With the passage of time after a hypersensitivity reaction to Penicillin, most individuals cease to produce specific IgE and can safely be given the drug. About 10% of people however remain hypersensitive.
Penicillin V (Phenoxymethylpenicillin) given orally and increased by doubling the dose every 15 minutes for 14 doses.
The desensitisation procedure is performed in hospital with intravenous access and close personal medical supervision for 24 hours.
Mild cutaneous reactions are allowed to resolve spontaneously or are treated with Chlorphenamine
10 mg intravenously over one minute.
The injection of Benzathine Penicillin is then given within 30 minutes of completing the final dose of the desensitisation regimen, and the patient is
monitored overnight.
false positive EIA vs RPR
EIA is generally more specific and less prone to false positives than RPR, especially when used in a reverse screening algorithm (EIA first, then RPR).
EAI false +ve: history of syphilis or other conditions that can cause a false-positive result.
RPR false +ve:
infections, autoimmune diseases, pregnancy, and certain medications.
Syphilis IgG and IgM
IgM is detectable during the second week of infection, whereas production of IgG begins around the fourth week after infection and usually reaches much higher titres than those for IgM.
Half life NO
5-10 seconds
Half life RBC
100 days
Half life GH
20 mins
Half life E2
2 hours
E2=2
