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PR3152 > Contraception > Flashcards

Contraception Flashcards

1
Q

What are the 2 forms of contraception

A
  1. Barrier method –> inhibiting viable sperm from coming into contact with a mature ovum
  2. Hormonal method –> preventing fertilized ovum from successfully implanting into the endometrium
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2
Q

What are the 4 barrier contraceptives available?

A
  1. Condoms (male)
  2. Condoms (female)
  3. Diaphragm with spermicide
  4. Cervical cap
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3
Q

Which contraceptives are useful for preventing STI transmission?

A

Condoms (male and female)

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4
Q

What are the limitations of barrier contraceptives?

A

High user failure rate

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5
Q

Benefits brought about by hormonal contraceptives

A
  1. Prevention of pregnancy
  2. Improvements in menstrual cycle regularity
  3. Management of perimenopause
  4. Management of PCOS
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6
Q

What is the MOA of progestin in COC?

A
  1. Thicken cervical mucus to prevent sperm penetration -> delaying sperm transport
  2. Induce endometrial atrophy (maintain thickness of endometrial and prevent it from growing)
  3. Stabilize the endometrial lining
  4. Provide cycle control
  5. Inhibit LH release –> prevents ovulation
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7
Q

What are the estrogen agents available?

A
  1. Ethinyl estradiol
  2. Estradiol valerate
  3. Esterol
  4. Mestranol
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8
Q

What is the main side effect of progestins?

A
  1. Androgenic side effects (ie. acne, oily skin, hirsutism) (associated with Gen1-3 progestins)
  2. Episodes of unpredictable spotting and bleeding (increases with increasing dose)
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9
Q

What is the MOA of Ethinyl estradiol?

A
  1. Synthetic estrogen
  2. Estrogen receptor agonist
  3. Inhibit FSH release from anterior pituitary –> suppress the development of ovarian follicle (prevent ovulation)
  4. Make endometrium unsuitable for implantation of the ovum
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10
Q

ADR of EE?

A
  1. breast tenderness
  2. Headahce
  3. Fluid retention (bloating)
  4. Nausea/ Vomiting or dizziness
  5. Weight gain
  6. Liver damage
  7. VTE
  8. MI/ stroke
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11
Q

ADR of EE?

A
  1. breast tenderness
  2. Headache
  3. Fluid retention (bloating)
  4. Nausea
  5. Dizziness
  6. Weight gain
  7. VTE
  8. MI/ stroke
  9. Liver damage
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12
Q

Factors favoring lower dose of EE?

A
  1. Adolescence
  2. underweight (< 50kg)
  3. Age >35 yo
  4. Peri-menopausal
  5. Fewer side effects
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13
Q

Factors favoring higher dose of EE?

A
  1. Obesity or weight >70.5 kg
  2. Early to mid-cycle breakthrough bleeding/ spotting
  3. Tendency to be non-compliant
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14
Q

List all the progestin agents by their Generation

A

Gen1: Norethindrone, Ethynodiol diacetate, Norgestrel, Norethindrone acetate
Gen2: Levonorgestrel
Gen3: Norgestimate, Desogestrel
Gen4: Drosperinone, Cyproterone

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15
Q

What are the features of Drosperinone (gen 4)?

A
  1. Analogue of spironolactone
  2. Anti-mineralocorticoid + some anti-androgenic action
  3. Less water retention and acne
  4. Can cause hyperkalemia, thromboembolism (VTE), and bone loss
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16
Q

What are the features of Cyproterone?

A
  1. Anti-androgenic + Anti-gonadotrophic
  2. Primary indication is to treat excessive androgen-related conditions
  3. Should not be used solely for contraception
  4. High risk for thromboembolism (VTE)
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17
Q

When there is early-mid-cycle breakthrough bleeding, what do you adjust in the COC?

A

Increase estrogen concentration

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18
Q

When there is late-cycle breakthrough bleeding and painful menstrual cramps, what do you adjust in the COC?

A

Increase progestin concentration

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19
Q

Advantages of monophasic COC

A
  1. Less confusing
  2. Less complicated miss-dosed instructions
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20
Q

Advantages of multiphasic COC

A
  1. Tend to have lower progestin –> less androgenic s/es
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21
Q

How many active and placebo pills are in conventional COC

A

21 days active pill + 7 days placebo (pill-free interval)
- Newer formulations has 24 active pills + 4 days placebo

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22
Q

Benefit of shorter pill-free interval?

A
  1. Reduce hormone fluctuations between cycles –> less side effects
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23
Q

How many active pills and placebo are in extended-cycle COC?

A

84 days active + 7 days placebo –> less periods
- Continuous COC has no placebo

24
Q

What are the different methods for initiating COC and what to take note of?

A
  1. First day method: Start on first day of menstrual cycle –> no backup contraceptions required
  2. Sunday start method: Start on first Sunday of menstrual cycle –> require backup contraceptive for 7 days
  3. Quick start method: Start ASAP –> require 7 days backup contraceptive or more (until next cycle)
25
Factors in selecting COC?
1. Hormonal content required 2. Convenience 3. Adherence level 4. Tendency for acne, oily skin, or hirsutism 5. Medical conditions (eg. premenstrual syndrome, dysmenorrhea)
26
Non-contraceptive benefits of COC
1. Relief from menstrual related problems 2. Improvement in menstrual regularity 3. Better for acne 4. Premenstrual dysphoric disorder (PMDD - severe PMS) 5. Iron-deficient anemia 6. PCOS 7. Reduced risk for ovarian and endometrial cancers 8. Reduced risk of ovarian cysts, ectopic pregnancy, pelvic inflammatory diseases, endometriosis, uterine fibroids, benign breast disease
27
Major side effects associated with COC?
1. Breast cancer 2. Venous Thromboembolism (VTE) 3. Ischemic stroke/ MI
28
Risk factors for breast cancer when on COC
1. Duration on COC (after discontinuation, risk return to normal) 2. Age >40 yo (avoid) 3. Family Hx/ risk factors for breast cancer 4. Current/ recent PMH of breast cancer (within 5 years)
29
Which agent in COC are responsible for increasing VTE risk?
1. Estrogen: Increase hepatic production of factor VII, factor X, and fibrinogen --> increase coagulation 2. Newer generation progestin (Desogestrel, Drosperinone, Cyproterone)
30
Risk factors for VTE
1. >35 yo 2. Obesity 3. Smoker 4. Family Hx of VTE 5. Immobilization 6. Cancer
31
Alternative contraceptives if patient is at risk of VTE?
1. Low dose estrogen with older generation progestins 2. Progestin-only contraceptives 3. Barrier method
32
Which component in COC is responsible for the increased risk of MI/ ischemic stroke?
Estrogen > progestin
33
Which risk factor of MI/ ischemic stroke is an absolute contraindication for COC?
Migraine with aura (opt for progestin-only or barrier contraceptives)
34
Risk factors of MI/ ischemic stroke that requires low-dose estrogen/ progestin-only/ barrier contraceptives
1. Age 2. HTN 3. Obesity 4. Dyslipidemia 5. Smoking 6. Prothrombotic mutations
35
Absolute contraindications for COC
1. Current breast cancer/ Recent Hx of breast cancer (within 5 years) 2. Hx of Deep vein thrombosis/ pulmonary embolism, acute DVT/ PE and patients with DVT/ PE while on anticoagulant therapy 3. Major surgery with prolonged immobilization (increased risk for VTE) 4. <21 days postpartum 5. Thrombogenic mutations 6. Migraine with aura 7. Severe HTN (SBP >160mmHg or DBP >100mmHg) 8. HTN with vascular disease 9. Current/ Hx of ischemic heart disease 10. Cardiomyopathy 11. Smoking ≥15 sticks/day AND age ≥35 yo 12. Hx of cerebrovascular disease
36
Common adverse effects of COC use and management
1. Breakthrough bleeding: If early/ mid cycle, increase estrogen; If late cycle, increase progestin 2. Acne: Change to less androgenic progestin 3. Bloating: Decrease estrogen/ change to progestin with mild diuretic effect (ie. Drosperinone) 4. N/V: Reduce estrogen/ take pills at night 5. Headache: Usually occurs in pill-free interval, switch to extended-cycle COC or continuous COC 6. Menstrual cramps: Increase progestin/ switch to extended-cycle or continuous COC 7. Breast tenderness/ Weight gain: Reduce estrogen and progestin
37
Counselling points for patient complaining about mild side effects associated with COC
1. Adverse effects tend to occur during early COC use, may improve by 3rd-4th cycle after adjusting to hormone levels 2. Persevere on COC for 2-3 months before considering a change
38
DDI with COC
1. Rifampin: Antibiotic that can alter gut flora --> alter metabolism --> less active drug; use backup contraceptive for 7 days after discontinuing rifampin 2. Anticonvulsants (eg. phenytoin, carbamazepine, barbiturates, topiramate, oxcarbazepine, lamotrigine): Reduces free serum concentrations of both estrogen and progestin 3. HIV antiretrovirals (eg. Ritonavir, Darunavir): Reduces both effectiveness of COC and antiretroviral
39
Counseling for missed dose of COC
- If one dose is missed (<48hrs since a pill should have been taken), take the missed dose immediately and continue with the rest as usual - If ≥2 consecutive doses are missed (>48hrs), take the missed dose immediately and discard the rest of the missed dose --> continue the rest as usual and have backup contraceptive for 7 days - If pills were missed during the last week of hormonal tablets (eg. day 15-21), finish the remaining active pills in the current pack, skip the hormone-free interval and start a new pack the next day, backup contraceptive for 7 days
40
Advantages of Progestin-only pills (POP)
1. Good for breast-feeding (avoid estrogen while breastfeeding), intolerant to estrogen, conditions that preclude estrogen 2. Continuous pills (28 days pills)
41
Counselling points for initiating Progestin-only pills (Norethisterone)
1. Start within 5 days of menstrual cycle/ bleeding --> no backup contraceptive required 2. Start any other day --> require backup contraceptive for 2 days
42
Counselling for missed dose of Progestin-only pill
If late dose by >3 hours, back-up contraceptive for 2 days is required
43
What are the components in transdermal contraceptives
Both estrogen and progestin
44
Limitations of transdermal contraceptive
1. Not as effective in patients >90 kg 2. Continuous exposure to estrogen can increase risk of VTE
45
Limitation of transdermal rings
Continuous exposure to estrogen can increase risk of VTE
46
Frequency of progestin injections
IM injection every 12 weeks (3 months)
47
Limitation of progestin injection
1. Return to fertility might be delayed 2. Breakthrough bleeding especially in the first 9 months 3. 50% of patients become amenorrhea after 12 months 4. Regular doctor's visit
48
Notable adverse effects of progestin injections
1. Weight gain 2. Short term bone loss --> reduced bone mineral density (Black Box Warning)
49
When to avoid progestin injections
1. Older women 2. Osteoporosis risk factors (especially long-term steroids) --> risk of bone loss
50
List the 2 long acting reversible contraception (LARC) available
1. Intrauterine device (IUD) 2. Subdermal progestin implants
51
MOA of IUD
1. Inhibition of sperm migration 2. Damage ovum 3. Damage/ disrupt transport of fertilized ovum 4. (if with progestin) Endometrial suppression and thickening of cervical mucus
52
Contraindication of IUD
1. Pregnant 2. Current STI 3. Undiagnosed vaginal bleeding 4. Malignancy of genital tract 5. Uterine anomalies of uterine fibroids
53
Risk associated with IUD
1. Uterine perforation 2. Expulsion 3. Pelvic inflammation
54
Uses for Levonorgestrel IUD
1. To decrease menstrual flow 2. Ideally used if concomitant menorrhagia 3. Inserted for 5 years 4. Side effects include: spotting and amenorrhea
55
Use for Copper IUD
1. Used for heavier menses/ bleeding 2. Ideally used if concomitant amenorrhea 3. Inserted for 10 years 4. Can be used as emergency contraception

PR3152 (7 decks)

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