Obstetrics & gynaecology Flashcards
(591 cards)
What hormonal changes occur in pregnancy?
increased:
steroid hormones
T3/4
prolactin
melanocyte stimulating hormone
oestrogen
progesterone
HcG
What cardiovascular changes occur in pregnancy?
increased:
blood volume
plasma volume
cardiac output
decreased:
vascular resistance
blood pressure
What respiratory changes occur in pregnancy?
Increased:
tidal volume
resp rate
What renal changes occur in pregnancy?
Increased:
blood flow
GFR
sodium reabsorption
water reabsorption
protein excretion
What haematological changes occur in pregnancy?
Increased:
RBC production
WBC
Clotting factors
ALP
decreased:
Platelets
Haematocrit
Albumin
What skin changes occur in pregnancy?
Linear Nigra
melasma
striae gravidarum
spider naevi
Palmar erythema
When does labour and delivery normally occur?
between 37 and 42 weeks gestation
What are the 3 stages of labour?
The first stage is from the onset of labour (true contractions) until 10cm cervical dilatation.
The second stage is from 10cm cervical dilatation to delivery of the baby.
The third stage is from delivery of the baby to delivery of the placenta.
What is the role of prostaglandins in labour?
Ripening of cervix
uterine contractions
can use prostaglandin E2 pessaries to induce labour
What are the 3 phases of the first stage of labour?
Latent phase: From 0 to 3cm dilation of the cervix. This progresses at around 0.5cm per hour. There are irregular contractions.
Active phase: From 3cm to 7cm dilation of the cervix. This progresses at around 1cm per hour, and there are regular contractions.
Transition phase: From 7cm to 10cm dilation of the cervix. This progresses at around 1cm per hour, and there are strong and regular contractions.
What 3 factors does the second stage of labour depend on?
Power: strength of contraction
Passenger: size, attitude(posture), lie, presentation
Passage: size and shape of pelvis/birth canal
What are the 7 cardinal movements of labour?
Engagement
Descent
Flexion
Internal Rotation
Extension
Restitution and external rotation
Expulsion
How is decent of the baby measured?
position of baby’s head in relation to ischial spines
-5: when the baby is high up at around the pelvic inlet
0: when the head is at the ischial spines (this is when the head is “engaged”)
+5: when the fetal head has descended further out
What 2 factors should prompt active management of the 3rd stage of labour?
Haemorrhage
more than 60 minute delay in delivery of placenta
What is active management of the 3rd stage of labour?
IM oxytocin
traction to the umbilical cord
What are some causes of primary amenorrhoea?
Abnormal functioning of the hypothalamus or pituitary gland (hypogonadotropic hypogonadism)
Abnormal functioning of the gonads (hypergonadotropic hypogonadism)
Imperforate hymen or other structural pathology
What is secondary amenorrhoea?
when the patient previously had periods that subsequently stopped
What are some causes of secondary amenorrhoea?
Pregnancy (the most common cause)
Menopause
Physiological stress due to excessive exercise, low body weight, chronic disease or psychosocial factors
Polycystic ovarian syndrome
Medications, such as hormonal contraceptives
Premature ovarian insufficiency
Thyroid hormone abnormalities
Excessive prolactin, from a prolactinoma
Cushing’s syndrome
What are some differentials for irregular menstruation?
Extremes of reproductive age
Polycystic ovarian syndrome
Physiological stress
Medications, particularly progesterone only contraception, antidepressants and antipsychotics
Hormonal imbalances, such as thyroid abnormalities, Cushing’s syndrome and high prolactin
What are some differentials for intermenstrual bleeding?
Hormonal contraception
Cervical ectropion, polyps or cancer
Sexually transmitted infection
Endometrial polyps or cancer
Vaginal pathology, including cancers
Pregnancy
Ovulation can cause spotting in some women
Medications, such as SSRIs and anticoagulants
What are some differentials for dysmenorrhoea (painful periods) ?
Primary dysmenorrhoea (no underlying pathology)
Endometriosis or adenomyosis
Fibroids
Pelvic inflammatory disease
Copper coil
Cervical or ovarian cancer
What are some differentials for menorrhagia?
Dysfunctional uterine bleeding (no identifiable cause)
Extremes of reproductive age
Fibroids
Endometriosis and adenomyosis
Pelvic inflammatory disease
Contraceptives, particularly the copper coil
Anticoagulant medications
Bleeding disorders (e.g. Von Willebrand disease)
Endocrine disorders (diabetes and hypothyroidism)
Connective tissue disorders
Endometrial hyperplasia or cancer
Polycystic ovarian syndrome
What are some differentials for postcoital bleeding?
Cervical cancer, ectropion or infection
Trauma
Atrophic vaginitis
Polyps
Endometrial cancer
Vaginal cancer
What are some differentials for pelvic pain?
Urinary tract infection
Dysmenorrhoea (painful periods)
Irritable bowel syndrome (IBS)
Ovarian cysts
Endometriosis
Pelvic inflammatory disease (infection)
Ectopic pregnancy
Appendicitis
Mittelschmerz (cyclical pain during ovulation)
Pelvic adhesions
Ovarian torsion
Inflammatory bowel disease (IBD)