Clinical Notes Flashcards
What role does progesterone play in pregnancy?
Lecture: Steroid biosynthesis Correlation box p.247
- Supports gestation (pregnancy) & embryogenesis
- Is involved in the maintenance of the menstrual cycle.
- Regulates the voltage gated calcium channels on spermatozoa
- Prepares the uterus for implantation
- Causes smooth muscle relaxation
- Decreases maternal immune response
A decrease in progesterone precedes menstruation, labor & lactation
What is the correlation between glucocorticoids and infant respiratory distress syndrome (IRDS)
Lecture: Steroid biosynthesis Correlation box p.247
During delivery, a burst of glucocorticoids alters the lung structure in infants by stimulating the production of surfacants, which allows the air spaces to expand. In preterm neonates this process is defective, leading to IRDS. It can be prevented by giving glucocorticoids to expectant mothers.
How can licorice cause hypertension
Lecture: Steroid biosynthesis Correlation box p.247
Natural licorice roots contain isoflavones which are inhibitors of 11B-dehydrogeanse. This can cause hypertension due to salt retention.
What has Finasteride been used for?
Lecture: Steroid biosynthesis Correlation box p.247
- Treat benign prostatic hyperplasia
- Male pattern baldness (caused by accumulation of DHT in the scalp)
What is adrenal hyperplasia?
Lecture: Steroid Biosynthesis
Caused by deficiencies in the adrenal enzymes that are used to synthesize glucocorticoids which leads to the increased production of cortisol precurors and androgens from the adrenal gland
How can women present with adrenal hyperplasia?
Lecture: Steroid Biosynthesis
- Hirsutism (excess body hair)
- General oligomenorrhea (infrequent or light periods)
- Infertility
What is Primary Aldosteronism/Conn Syndrome
Lecture: Steroid Biosynthesis
Adrenal glands produces excessive levels of aldosterone which causes a loss of potassium and retention of sodium leading to hypertension:
- Body holds on to too much water
- Increases blood volume
- Increases blood pressure
What are some disorders associated with vitamin D
Lecture: Steroid biosynthesis Correlation box p.10
Insufficient Vitamin D
- Brittle bones (rickets) in children
- Osteomalacia in adults
- Hypocalcemic tetany (involuntary muscle contraction)
Excess Vitamin D
- Elevated calcium in blood and urine
- Appear dazed
- Loss of apetite
- Sarcoidosis
What is hypospadias
A common male birth defect that is a result of the failure of the urogenital (urethral) folds to close properly
Lecture: Development of the Reproductive System
What is Epispadias
Opening of the urethra on the superior aspect of the penis. Cause is unknown but may be due to improper ventral body closure or formation of too large of a cloacal membrane to be covered when it ruptures
Lecture: Development of the Reproductive System
What is didelphys
Double uterus
Lecture: Development of the Reproductive System
What is it called when an individual has testes but their phenotype appears female
46, XY DSDs
Lecture: Development of the Reproductive System
What are some causes of 46, XY DSDs
- Inadequate testosterone synthesis
- Androgen insensitivity syndrome
- 5 alpha-reductase deficiency
- Mutation in AMH or AMH receptor
* Lecture: Development of the Reproductive System*
What are the characteristics of androgen insensitvity syndrome
- Common cause is loss of functional androgen receptors (X linked recessive)
- They have testes but no spermatogensis. Testosterone levels may be high due to a lack of negative feedback.
- At puberty, the testosterone is metabolized to estradiol initiating female secondary sexual characteristics
- Produce AMH so paramesonephric system is supressed = no uterus or uterine tube and the vagina is short and ends blindly.
- Testes usually found in inguinal or labial regions
- Increased risk of tumor formation in gonads
* Lecture: Development of the Reproductive System*
What are the characteristics of 5- alpha-reducatse deficiency
- Autosomal recessive
- Have a 46 XY genotype
- Normal testis and duct system since there is AMH and testosterone
- Underdeveloped male external genitalia due to deficieny in DHT
- Lecture: Development of the Reproductive System*