Obs & Gyne Flashcards
What is the name of the axis, controlling the menstrual cycle?
Hypothalamic-pituitary-gonadal axis (HPG)
What are the 3 types of hormone involved in the control of the menstrual cycle?
Gonadotrophs (LH, FSH, hCG), steroids (Oestrogen, Progesterone), cytokines (activins, Inhibins)
What cells are sensitive to luteinising hormone?
Theca cells
What cells are sensitive to follicular stimulating hormone?
Granulosa Cells
What is the function of Theca cells?
Sensitive to LH, convert cholesterol precursor to testosterone and progesterone
What is the function of granulosa cells
Sensitive to FSH, Contain aromatase, and convert testosterone to oestrogen. Induce LH receptors one dominant follicle.
What hormone causes increased LH receptors on dominant follicle?
FSH, Granulosa cells cause increased receptors.
Which part of the menstrual cycle is variable in length.
Follicular stage (1-14 days)
What part of the menstrual cycle is constant in length?
Luteal Phase (15-28 days)
Explain implantation of the blastocyst.
2 way communication between the blastocyst and endometrium.
What is the function of hCG?
Signals to the corpus luteum to continue to produce progesterone, until the placenta is formed.
When does the fertilised egg start producing hCG?
6-7 days.
What is the name of the drug which competitively inhibits progesterone?
Mifepristone
What is mifepristone used for?
Medical abortion
What is the function of progesterone?
Proliferation, vascularisation and differentiation fo endometrium. Th1 regression and Th2 formation.
What does a decline in oestrogen during pregnancy indicate?
Fetal distress
What is the process of placenta formation called in humans?
Haemochorial placentation.
What are the cells called which invade the endometrium to aid implantation?
Extra-villus trophoblast.
What is the process of EVT invading spiral arteries called?
Endovascular invasion.
What diseases can failed endovascular invasion cause?
Prematurity Preeclampsia Miscarriage Abruption Fetal growth restriction
What is the definition of ectopic pregnancy?
Pregnancy anywhere outside the uterus
Where is the Fallopian tube is the most common site for ectopic pregnancy?
Ampulla (50%)
Isthums (20%)
What term is given to a placenta which invades past Nitabuchs layer, into the superficial myometrium?
Placenta accreta (80%)
What term is given to a placenta which invades past Nitabuchs layer, into the deeper myometrium?
Placenta Increta (17%)
What term is given to a placenta which invades past Nitabuchs layer, and penetrated into the uterine serosa?
Placenta Percreta (5%)
What is the risk of an abnormal placental connection?
Poor placental separation at parturition, leading to significant post part UK bleeding.
Do syncitiotrophoblast cells contain MHC?
No
Which Th cells have more of a role in pregnancy?
Th2
What diseases improve during pregnancy?
Auto immune diseases, Th1, Rheumatoid Arthritis
Which autoimmune diseases get worse during pregnancy?
SLE, Th2
What are the 3 stages of parturition?
Cervical dilatation, fetal expulsion, placental delivery and haemostasis
What is the Ferguson reflex?
Positive feedback of oxytocin on the hypothalamus, to sustain uterine contractions.
What are the reasons for using contraception?
Prevent unwanted birth, prevent teenage birth, prevent STI Transmission, control family sizes, reduce abortion rates.
What should be asked in the clinical assessment when prescribing contraception?
Obs: Previous pregnancy, Menstrual History, contraceptive need
PMH: Previous STI, Heart disease, VTE. Breast cancer, migraine
DHx: StJohns Wort
Sx: Smoking, breast feeding
What should be included in the examination when prescribing contraception?
BP Measurements, BMI, Cervical smear, STI screen
What is the Fraser criteria?
A girl under 16 has capacity to contraception if they:
Understand the doctors advise,
The benefits outweigh the risks in giving contraception,
The girl will continue having unprotected sex,
Physical or mental health with suffer from pregnancy
What do you need to tell a patient starting contraception?
How to use Mode of action Efficacy Drug Interactions Side-effects/ benefits
What is the mechanism of the COCP?
Prevents ovulation, and alters cervical mucus to act as a plug. It also thins the lining of the womb.
What is the perfect use failure rate of the COCP?
0.1% to 2%
What is the typical use failure rate of the COCP?
8%
What are the advantages of the COCP?
Reversible, reliable, 12hr window Regular predictable cycle. Helps with acne. Low menorrhagia. Lower risk of PID Helps with PMS. Protective against ovarian, endometrium and colorectal cancer
What are the disadvantages of COCP?
Drug interactions (-epileptics, antibiotics, herbals)
Doesn’t prevent STI
D&V reduces efficacy
Small risk of breast cancer and cervical cancer
RISK OF VTE
What are the advantages of Contraceptive patches?
Even delivery of hormones (oestrogen and progesterone)
What are the disadvantages of contraceptive patches?
Skin irritation, expensive
How does the progesterone only pill work?
Thickens cervical mucus
Thins endometrium
Decreases tubular motility
Stops ovulation (15-40%)
What is the perfect use failure rate of the POP?
0.5%
What is the typical use failure rate of the POP?
13%
What are the advantages of the POP?
Prevent oestrogenic side effects (breast tenderness, headache, nausea),
Can be used in large BMI,
Unused in individuals with migraines.
What are the disadvantages of POP?
Less effective than COCP, 3Hr window, Risk of ectopic Disrupt mistrial pattern, Ovarian cysts.
What is the perfect use failure rate of condoms?
2%
What is the typical use failure rate of condoms?
15%
What are the disadvantages of female condoms?
Loud, Intrusive, Easy for penis to miss Higher failure rate than male condoms, Careful insertion
What are the advantages of female condoms?
Protection from STI
Not affected by oils
What is the failure rate of diaphragms?
2-5%
Why would someone need their diaphragm size changing?
> 3kg weight change
What are the disadvantages of diaphragms?
Correct insertion by trained staff,
Spermicide can be messy,
Must be in place 6hr after intercourse,
Can become dislodged.
What are fertility awareness methods?
Planning of menstrual cycle to predict fertility in infertility periods.
What are the disadvantages of FAM?
Teacher required pregnancy/ prevent,
3-12 months data needed before start,
Period of abstinence.
What is Lactational amenorrgea?
A postpartum period where a women is ammenorrhoeic if fully breast feeding
What is the effectiveness of LAM in normal breast feeding?
98%
What is the failure rate of LAM in pump breast milking?
5-6%
Give some examples of user dependant contraceptives.
COCP POP Contraceptive patch Condoms LAM FAM Diaphragms
Give examples of London acting contraceptives (LARC).
Injectable contraceptive
Implant
IUD
IUS
Give examples of permanent contraceptives.
Male sterilisation
Female sterilisation
Give examples of emergency contraceptives.
Levonelle, elleOne
What is the name of the injectable contraceptive?
Deep-provera
What interval is depo-provers given?
12 week intervals
How does the injectable contraceptive work?
Inhibits ovulation by suppressing LH & FSH
How soon after abortion can depo-provers be given?
Immediately.
Should depo-provers be given to diabetic women?
Diabetic women can find altered blood sugar, so close regulation is needed.
What are the advantages of injectables?
Little user dependence, helps with PMS, heavy periods, amenorrhoic
What are the disadvantages of the injectables?
Irregular bleeding, amenorrhoea, increase appetite, increase weight gain, slow reversibility
What hormone do implants contain?
Progesterone
How long can I plants be fitted after abortion?
5 days
How is an implant identified on X-ray?
Barium sulphate
How do IUD’s work?
Foreign body reaction within uterus (copper), prevents implantation
How soon after abortion can IUD’s be fitted?
Immediately
How soon can IUD’s be fitted after delivery?
6 weeks
What are the advantages of IUD’s?
Long term, effective immediately, effective as immediate contraception
What are the disadvantages of IUD’s?
Menstrual irregularities, spotting, menorrhagia, increase risk of PID, Risk of ectopic
What hormone does mirena contain?
Progesterone
What are disadvantages of IUS?
Irregular bleeding, painful fitting, PID, Not emergency contraception
How does IUS work?
Endometrial atrophy
What are the advantages of IUS?
Effective, low risk of ectopic, low menstrual blood loss, low hormone levels
What hormone do levonella and Ella one contain?
Progesterone
What are the disadvantages of emergency contraception?
N&V, disrupt menstruation, doesn’t protect against STI
What are the advantages of emergency contraception?
Effective, easily available
What 2 medications are given to induce a miscarriage?
Mifepristone, and mesoprostol
What is the definition of Labour?
Spontaneous in onset, low-risk at start of labour and remaining throughout to delivery. The infant is born at 37-42 weeks of pregnancy. After birth mother and child are in good condition.
What is the latent phase?
Irregular contractions of uterus
How long does the latent phase last?
6hrs - 3 days
What is the management for the latent phase?
Stay at home, paracetamol
What is effacement?
Retraction of the cervix
What is dilation of the cervix?
Aperture of the cervix opening.
Labour: What is meant by ‘Presentation’?
The anatomical part of the foetus which presents itself first through the birth canal.
Labour: What is meant by ‘lie’?
The relationship between the long axis of the foetus and the long axis of the uterus.
Labour: What is meant by ‘attitude’?
Presenting part flexed or extended
Labour: What is meant by ‘engagement’?
The widest part of the presenting part has passed through the pelvic brim
Labour: What is meant by ‘station’?
Relationship between the lowest point of the presenting part and the ischial spines
What are the 3 P’s of active labour?
Power, passage, passenger
What is a side effect of Entonox?
N&V
What are fetal side effects of opiates?
Respiratory depression, diminished breast seeking behaviour
What are the maternal side effects of opiates?
N&V, euphoria, longer labour.
What is the most effective form of labour pain relief?
Epidural.
What are the maternal side effects of an epidural?
Longer labour (1&2 stage),
Fetal malposition, increase instrumental use,
Bladder incontinence, hypotension
What are fetal side effects of epidural?
Tachycardia, decreased breast feeding behaviour
How often is the fetal heart monitored at 1st stage & after a contraction?
Every 15 minutes, after 1 minute
What characterises 2nd stage labour?
Full dilation,
Visible head,
Descent.
What are the stages of the mechanism of labour?
Descent, Flexion, Internal rotation, Crowning, Extension, Restitution, Lateral flexion
What is the 3rd stage of labour?
Decrease blood loss, after birth delivery, cut cord, check placenta.
Why is cord clamping delayed?
Encourage drainage of blood into foetus, to reduce fetal anaemia.
What are risk factors for pelvic floor disorders?
Age, parity, obesity, smoking.
What is the definition of incontinence?
Involuntary leakage of urine
What are the 2 syndromes of incontinence?
Stress incontinence, overactive bladder
What is the pathophysiology of stress incontinence?
Sphincter weakness
What is the pathophysiology of an overactive bladder?
Involuntary bladder contractions.
What are the symptoms of an overactive bladder?
Urgency incontinence Frequency Nocturia Nocturnal enuresis ‘Key in door’/ handwash
What are the symptoms of stress incontinence?
Involuntary leakage
What are the simple assessments for incontinence?
Frequency volume chart
Urinalysis
Residual urine measurement
Questionnaire
What information does a frequency volume chart provide?
Voided volume Frequency Fluid intake Diurnal variation Leakage frequency and quantity
What does nitrites on urinalysis indicate?
Infection
What can microscopic haematuria on urinalysis indicate?
Glomeruloneohritis,
Neoplasia, calculus, infection
What does protein on urinalysis indicate?
Nephrotic syndrome, cardiovascular disease
What does glucose on urinalysis indicate?
Diabetes, IGT
What are the e-PAQ dimensions?
Vaginal Bowel Urinary Coitus/ Sexual (V-bucks)
What is the treatment for stress incontinence?
Conservative- physiotherapy
Surgical- sling
What is the treatment for overactive bladder?
Bladder drill, Botox Anticholinergics Augment Bypass
Give some examples of containment options for incontinence.
Pads, catheters, odour control, skin care
What lifestyle adaptations could you give to someone who is incontinent?
Weight loss, smoking cessation, reduce caffeine intake, avoid straining
What symptoms can local vaginal oestrogen help with incontinence?
Frequency, urgency, incontinence.
What parasympathetic nerve roots innervate the detrusor?
S2,3,4
What nerve roots innervate the detrusor for micturition?
T11-L2 (Sympathetic)
What can be used to treat an overactive bladder?
Atropine.
What nerve controls the external sphincter?
Pudendal (S2,3,4)
What receptors innvervate the detrusor?
M2, M3
Name an muscarinic antagonist.
Oxybutynin
What are the side effects of muscarinic antagonists?
Dry mouth, constipation, blurred vision, fast heart, memory loss
Name a beta-3 adrenergic agonist.
Mirabegron
Give some examples of physiotherapy for incontinence.
Pelvic floor exercises, Tens, vaginal cones
When should you repair a prolapse?
Symptomatic or severe
What is the procedure called for a prolapsed vagina?
Sacrifice spinous.
Give some examples of non-STI, genital infections.
Candidiasis, vestibulitis, balantis, bacterial vaginosis, lichen sclerosis, vulvodynia
What is the definition of the menopause?
Cessation of menstruation
What is the average age of the menopause?
51
How is the menopause diagnosed?
12 months amenorrhoea
What is the perimenopause?
Period leading up to menopause
What are symptoms of the perimenopause?
Irregular periods, hot flush, mood swings, atrophy of vagina
Give some short term impacts of the menopause.
Vasomotor symptoms (Sleep, mood, QoL) Generalised symptoms (Mood swings, hot flush, memory loss, headache, joint Pain)
Give some medium term impacts of the menopause.
Urogenital atrophy, UTI, Dyspareunia, incontinence (55-65 yrs)
Give some long term impacts of the menopause.
Osteoporosis, cardiovascular disease, dementia
What are the 3 options for menopause management.
Hormonal (HRT), non hormonal (Clonidine), non pharmaceutical (CBT)
What are the benefits of HRT?
Relief of menopausal symptoms, BMD protection
What are the risks of HRT?
Breast cancer, VTE, CVD, CVA
What is the risk increase of breast cancer with HRT (Oestrogen).
Little change
What is the increase risk of breast cancer with
HRT (Oestrogen and progesterone)?
Increased risk
What is the management of women with early, local breast cancer and menopausal symptoms?
Discontinue HRT, do not offer HRT
Women with BMI 32 is offered HRT? Transdermal or oral?
Transdermal, lower risk of VTE (Baseline population)
What age does CVD risk not increase when starting HRT?
<60 yrs
Who should have transdermal HRT?
Gastric upset, migraine, increased VTE, HTx, Choice
What is premature ovarian syndrome?
Menopause <40yrs, chromosomal abnormality, genetic
What is the advice in management of POS?
Hormonal replacement at least until the age of the menopause.
What are non hormonal methods to treat the menopause?
Clonidine, citalopram, fluoxetine.
What is endometriosis?
Endometrial tissue outside the uterus
What causes endometriosis?
Retrograde menstruation
What are 2 sites for endometriosis?
Umbilicus (Halbans), lungs (Meyers)
What is the usual presentation of endometriosis?
Pain, infertility
Describe the pain of endometriosis.
Cyclic Pain, dysmenorrhea, deep dyspareunia