Teratogenesis, Pregnancy, and Postpartum Issues Flashcards
What factors influence teratogenic potential?
- Duration of Use
- Susceptibility of Fetus
- Placental Transfer
- Timing of Exposure
What is the mechanism of Placental Transfer?
Passive Diffusion
What factors influence rate and extent of passive diffusion?
- MW
- Protein Binding
- Lipid Solubility
- Ionization
- Concentration Gradient
- Uterine Blood Flow
In terms of MW, what are the sizes that cross and do not cross the placenta?
<500 daltons, readily cross
>1000 daltons, do not cross in significant amounts
Do highly protein bound drugs cross the placenta?
NO
Ionized or Unionized drugs cross the placenta?
Unionized
The Pre-Embyronic Stage is 0-14 days after fertilization, what is the teratogen effect?
Teratogen exposure produces ALL or NOTHING effect
The Embryonic Stage is 14-56 days, what is the teratogen effect?
MOST Susceptible = MAJOR structural anomalies
The Fetal Stage is 57 days - term, what is the teratogen effect?
Anomalies more likely to involve growth and functional aspects
What are the limitations of the OLD FDA Categories?
Derived from animal data
No distinction between drugs in the same class
Majority in Category C
Lacks informative data
What does the REVISED FDA labeling include?
- Removed letter category
- Pregnancy Subsection
- Lactation Subsection
- Females and Males of Reproductive Subsection
What are agents to avoid DURING pregnancy?
- ACE/ARBs/Renin Inhibitors
- DOACs
- Isotretinoin
- NSAIDs
- Retinoids
- Thalidomide
- Trimethoprim
- Valproic Acid
- Warfarin
What is the concern with Thalidomide and does it have a REMs?
Contraindicated in Pregnancy
YES
What are the requirements for the REMS of Thalidomide?
- Prescription filled <7 days and no more than a 4-week supply at one time
- Patients required to use contraceptive measures
- Females must have neg pregnancy test within 24 hrs prior to starting treatment
What is the concern with Lenalidomide and does it have a REMs?
Contraindicated in pregnancy
YES
What is the concern with Retinoids?
Contraindicated in pregnancy
When is the greatest risk for Retinoids?
At 4-7 weeks gestation and risk persists after stopping therapy
What is the contraception requirement for Isotretinoin?
Contraception 1 month following DC
What is the contraception requirement for Acitretin (Soriatane)?
Contraception for 3 years following DC
What is the iPLEDGE Program?
REMs for Isotretinoin, requires all patients, prescribers, pharmacists, and wholesale distributors to register
For iPLEDGE patients must complete an informed consent with pick prescription within?
30 days for men and women who cannot get pregnant
7 days for women of childbearing potential
For females of childbearing potential, iPLEDGE requires what?
2 negative pregnancy tests before starting, negative pregnancy test every month, and use of 2 forms of contraception
Can you donate blood while taking Isotretinoin?
NO
How does the dating of pregnancy (gestation) work?
Gestation age refers to age of fetus beginning the first days of the last menstrual period which is ~2 weeks prior to fertilization
Prematurity is defined as?
<37 weeks gestation
Late Pretrerm is defined as?
34-36 weeks gestation
Gravidity (G) means what?
Number of pregnancies
Parity (P) means what?
Number of pregnancies that exceed 20 weeks of gestation and outcome of each pregnancy
What are the PK changes in pregnancy?
- Delayed gastric emptying, INCREASED gastric pH
- Decreased motility
- Increased total body water
- Increased body fat
- Increased cardiac output
- Increased GFR
- Decreased plasma albumin
Increase in gastric pH causes what?
Increase availability of acid-labile drugs or decrease availability for drugs that require acidic environment
Decrease gastric emptying causes what?
Delay time to peak concentration after admin
Decrease in GI motility causes what?
Increased absorption of enteral meds
Increase in total body water causes what?
Increase volume of distribution for hydrophilic meds = increase dose
Increase body fat causes what?
Increase volume of distribution for lipophilic meds
Increase cardiac output causes what?
Increase hepatic blood flow = increase hepatic metabolism
Increase GFR causes what?
Increase clearance of renal eliminated drugs
Decrease plasma albumin causes what?
Increase free drug for drugs that are highly protein bound
What Vitamins and Supplements should be taken?
- Pre-Natal Multi-Vitamin
- Iron
- Folate
- Calcium/Vitamin D
What is the minimum amount of iron that should be taken?
30 mg
What amount of iron is recommended during pregnancy?
30 mg/day
60-120 if iron deficiency anemia is present
What amount of iron is recommended in prenatal vitamin?
30-90 mg of elemental iron
What is the recommended amount of folate for all women of child-bearing age?
0.4 mg/day
What is the recommend amount of folate for women during pregnancy?
0.8 mg/day
What is the recommend amount of folate in prenatal vitamins?
0.8-1 mg of folic acid
What is the recommend amount of calcium and vitamin D for pregnancy?
1000 mg of calcium and 600 IU of vitamin D
When is dietary modifications recommended to treat diabetes in pregnant women?
Type 2 DM
What is the first line choice treatment of type 1 and 2 diabetes in pregnant women?
Insulin, does not cross placenta
If insulin is not used in Type 2 DM, what oral agents are recommended?
First Line: Metformin
Second Line; Glyburide
What is the concern with Glyburide in pregnant women?
May result in more neonatal hypoglycemia
What is chronic hypertension defined as in pregnancy?
Diagnosed before pregnancy or before 20 weeks gestation
What is the treatment for Mild-Mod Hypertension 140-149/90-108 mmHg?
Watch and Wait
Decrease salt, protein, stress
What is the treatment for CHRONIC Severe Hypertension >160/100 mmHg?
1st Lne: Labetalol PO or Nifedipine ER PO
2nd/3rd Line: Methyldopa PO or HCTZ PO
What is the goal BP for CHRONIC Severe Hypertension?
120-159/80-106 mmHg
What is the treatment for ACUTE Severe Hypertension >160/100 mmHg?
Hydralazine IV, Labetalol IV, Nifedipine IM
Start within 60 mins, not one is 1st line, if one doesn’t work at max dose move on to the next
When do you avoid ACE/ARBs in pregnancy?
2nd/3rd, with concern in the first
When do you avoid MRAs in pregnancy?
1st
What is the FDA box warning for ACE/ARBs?
DC use as soon as possible once pregnancy is detected
What is the drug of choice for asthma that is a beta agonist?
Albuterol
What is the drug of choice for asthma that is an inhaled corticosteroid?
Budesonide
What is the drug of choice for asthma that is a long-acting beta agonist?
Salmeterol/Formoterol
What are the anti-epileptic agents?
Valproic Acid, Phenytoin, Phenobarbital, Carbamazepine, and Topiramate
What does Valproic Acid cause?
Neural tube defects
Facial Cleft
What does Phenytoin cause?
Cleft palate
Limb defects
What does Phenobarbital cause?
Cardiac malformations
What does Carbamazepine cause?
Cleft palate
What does Topiramate cause?
Cleft palate
How do you manage epilepsy when pregnant?
Monotherapy at lowest effective dose, AVOID valproic acid, phenobarbital, and phenytoin if possible
What is the recommended folate supplementation for patients with epilepsy?
1 mg/day for w/epilepsy
4 mg/day for patients on carbamazepine or valproic acid
When is nonpharmacologic psychotherapy appropriate treatment for depression in pregnant women?
Effective for most with mild to moderate depression
What is the drug of choice for depression in pregnancy?
SSRIs are drug of choice
Sertaline and Fluoxetine
AVOID paroxetine and citalopram
What is the alternative drug for depression in pregnancy?
Tricyclic Antidepressants
Desipramine and Nortiptyline
What are the neonatal effects of SSRIs?
Persistent Pulmonary Hypertension of the newborn
Poor neonatal adjustment syndrome
What are the pregnancy-induced conditions?
- N/V
- Constipation
- GERD
- Gestational Diabetes
- Gestational HTN
- Preeclampsia
- Thromboembolism
What is the treatment goal for N/V (hyperemesis gravid arum)?
Decrease symptom severity and frequency, prevent and treat complications, and minimize potential fetal effects
What is the treatment algorithm for N/V?
- Dietary Changes
- Vitamin B6 and Doxylamine
- Add Dimenhydrinate, Diphenhydramine, Promethazine, or Prochlorperazine
- Add Metoclopramide or Ondansetron
- Add Chlorpromazine or Methylprednisolone
Add On: Ginger Extract
What are the precautions of Promethazine second line drug for N/V?
Dystonia, sedation, extrapyramidal reactions
What are the precautions of Prochlorperazine second line drug for N/V?
Dystonia, sedation, extrapyramidal reactions
What are the precautions of Metoclopramide second line drug for N/V?
Caution with use at < 10 weeks gestation, prolong QT interval
What are the precautions of Ondansetron third line drug for N/V?
Caution with use at < 10 weeks gestation, prolong QT interval
What are the precautions for Pyridoxine/Doxylamine (Diclegis) combination for N/V?
Delayed release tablet, sedation
What are the precautions for Pyridoxine/Doxylamine (Bonjesta) combination for N/V?
Extended release tablet, sedation
What is the first line option for N/V?
Pyridoxine
What are the OTC meds for N/V?
Diphenhydramine, Doxylamine, Meclizine, Pyridoxine, and Ginger
What is first line therapy for constipation in pregnancy?
Nonpharmacologic, dietary changes
What are the first line agents for constipation in pregnancy?
Antacids, H2 Antagonists, and PPI
What are the Antacids, and which one is most recommended?
Calcium Carbonate (most)
Aluminum Hydroxide (least)
Magnesium Hydroxide
What are the H2 Antagonists, and which one is most recommended?
Ranitidine (no)
Famotidine (most)
Cimetidine (avoid)
What are the PPIs and which one is most recommended?
Lansoprazole
Omeprazole (most)
Pantoprazole
What drugs should be avoided in constipation with pregnancy?
Antidiarrheal/Antisecretory Bismuth Subsalicylate and Antacid Sodium Bicarb
Why do you avoid Bismuth Subsalicylate?
Closure of ductus arterious
Why do you avoid Sodium Bicarbonate?
Maternal/Fetal metabolic alkalosis
What are the risk factors for Gestational Diabetes?
- Age >25
- Overweight
- Ethnic group with high incidence DM
- FH of DM
- History of abnormal glucose test
When should screening with oral glucose tolerance test OGTT occur?
24-48 weeks gestation
What is the drug of choice for gestational diabetes?
Insulin
What is the alternative oral agent for gestational diabetes?
Metformin
What is the classification for Gestational Hypertension?
Increase BP SBP>140 mmHg or DBP> 90 mmHg, after 20 weeks gestation
What is Preeclampsia?
Increase BP with proteinuria, Increase BP with thrombocytopenia, renal/hepatic insufficiency, pulmonary edema, or new onset headache
What is Eclampsia?
Tonic clonic seizures with preeclampsia
Is Eclampsia a medical emergency?
YES, requires intubation to protect airway, seizures can occur antepartum, intrapartum, or postpartum
What are the HELLP Complications for Preeclampsia?
H: Hemolysis
E: Elevated L: Liver Function tests
L: Low P: Platelets
What are the risk factors for Preeclampsia?
- Chronic HTN
- Chronic Renal Disease
- Maternal Age >40
- Multiple Gestation
- Preeclampsia in a previous pregnancy
- Gestational diabetes or diabetes
- Obesity
Management of Severe Preeclampsia applies to what patients?
- BP <160 SBP or >110 DBP on two occasions 4 hours apart
- Thrombocytopenia
- Impaired hepatic function
- Renal insufficiency
- Pulmonary edema
- New onset HA/or visual disturbances
What should be used to manage BP in Severe Preeclampsia?
IV Labetalol or Hydralazine
What should be used to manage Seizure Prevention in Severe Preeclampsia?
Magnesium Sulfate
What is the goal range for magnesium concentration for prevention of eclampsia?
4-7 mEq/L
What can be used for prevention of preeclampsia?
Low dose ASA may be used after 12 weeks of pregnancy for women at high risk for preeclampsia
How does the ASA dose change for patients with Type 1 or 2 DM?
100-150 mg/day
What is the preferred treatment for Thromboembolism in Pregnancy?
LMWH
What is the alternative first line treatment for Thromboembolism in Pregnancy?
UFH
When can Warfarin be used in pregnancy?
TERATOGEN, avoid unless used in women with mechanical heart valves (teratogenic risk decrease with doses <5mg)
Drug of Choice for Pain in Pregnancy?
Acetaminophen
Alternative Choice for Pain in Pregnancy?
NSAIDs, avoid in 1st/2nd trimester
Drug of Choice for Allergies in Pregnancy?
Chlorpheniramine or Intranasal Corticosteroids
Alternative Choice for Allergies in Pregnancy?
Diphenhydramine, Loratadine, and Cetirizine
Drug of Choice for Cough/Congestion in Pregnancy?
Oxymetazoline (nasal)
Pseudoephedrine (oral)
Dextromethorphan
Alternative Choice for Cough/Congestion in Pregnancy?
Guaifenesin, avoid due to congenital effects
Drug of Choice for UTI in Pregnancy?
Amoxicillin-Clavulanta or Nitrofurantoin
Alternative Choice for UTI in Pregnancy?
Cephalexin
Bactrim (avoid in 2nd/3rd trimester)
Drug of Choice for Diarrhea in Pregnancy?
Stool bulking
Alternative Choice for Diarrhea in Pregnancy?
Loperamide, use sparingly
What is defined as preterm labor?
Cervical dilation and/or uterine contractions at <37 weeks gestation
What are Tocolytic Agents used for?
Postpone delivery long enough (up to 38 hours) to allow for: administration of antenatal corticosteroids or transport of mother
What is the tocolytic beta agonist?
Terbutaline, not ideal due to hypotension, arrhythmias, and hyperkalemia
What is the tocolytic CCB?
Nifedipine, predominant agent
May cause hypotension
What is the tocolytic NSAID?
Indomethacin, predominant agent
May cause premature closure of ductus arterioles
What is the tocolytic magnesium?
Magnesium Sulfate, limited efficacy
What are the antenatal steroids that are utilized to accelerate fetal lung maturation?
Betamethasone or Dexamethasone
When is Betamethasone 12 mg IM or Dexamethasone 6 mg IM recommended?
Risk for delivery >24 to <34 weeks
Risk for delivery at >34 to <37 weeks with no previous course
What are the Cervical Ripening Agents?
Misoprostol (intravaginal/oral)
Dinoprostone (intravaginal/intracervical)
Dinoprostone Gel (prepidil) is what route?
Intracervical
Dinoprostone Vaginal (Cervidil) is what route?
Intravaginal
What drug stimulates/induces labor?
Oxytocin
How does drug excrete into breast milk?
Passive Diffusion
Maternal Serum Concentration in relation to breast milk
High maternal concentration = greater passive diffusion into milk
Lipid Solubility in relation to breast milk
Higher lipid solubility = greater transfer into milk
Protein Binding in relation to breast milk
Higher protein bound = less transfer into breast milk
Ionization in relation to breast milk
Unionized = greater transfer into milk
Molecular Weight in relation to breast milk
Low MW = greater transfer into milk
Acid/Base in relation to breast milk
Weak bases can be ionized when in breast milk
What drugs are contraindicated or use with caution in lactation?
- Bromocriptine
- Chemotherapy
- Codeine
- Cyclophosphamide
- Cyclosporine
- Iodine
- Lithium Carbonate
- Methotrexate
- Radiopharmaceutical
- Tetracyclines
What are acceptable meds for pain with lactation?
Acetaminophen or Ibuprofen
NOT ASA
What are acceptable meds for allergies with lactation?
Loratadine or Diphenhydramine
Can dry up milk supply
What are acceptable meds for cough/congestion with lactation?
Nasal Decongestants or Dextromethorphan
NOT Psuedoephedrine
What are acceptable meds for heartburn/reflux with lactation?
Antacids/Famotidine/Pantoprazole
NOT bismuth subsalicylate or cimetidine
What are acceptable meds for constipation with lactation?
Bulking Agents, Docusate, Bisacodyl, PEG
NOT Senna
What are acceptable meds for diarrhea with lactation?
Bulking Agents or Loperamide
NOT bismuth subsalicylate
What medications can cause low milk production?
- Bromocriptine
- Estrogen Containing contraceptive
- Oral Decongestants
- Antihistamines
- Nicotine
- Diuretics
What is a pharmacologic therapy for low milk production?
Metoclopramide
What is the management for Mastitis?
- Antibiotics for 10-14 days (cephalexin)
- Anti-Inflammatory Medications for Pain (ibuprofen)
- Nonpharmacologic Therapy
What is pharmacologic therapy for postpartum depression with lactation?
Sertraline First Line
Paroxetine or Nortriptyline Second Line
Fluoxetine CAUTION