Gynecology and Obstetrics Course - Master OB/GYN Topics

Use the grams target fetal cells mnemonic to identify antibiotics to avoid in pregnancy, including griseofulvin, aminoglycosides, macrolides, sulfonamides, tetracyclines, fluoroquinolones, and chloramphenicol, with fetal risks.

Learn early signs of pregnancy, including breast soreness, darkened areola, cramps and spotting, with rising hcg, plus common symptoms like morning sickness, bloating, fatigue, and heartburn.

Identify group B strep risk during pregnancy and apply penicillin prophylaxis based on rectovaginal culture at 37 weeks or for preterm delivery, fever, prolonged rupture of membranes, or prior GBS.

Describe intrahepatic cholestasis of pregnancy due to biliary obstruction and conjugated bilirubin buildup, with itchiness. Describe acute fatty liver of pregnancy as sudden liver failure with pain and fetal risk.

Diagnose preeclampsia when hypertension with proteinuria or end-organ dysfunction appears after 20 weeks, and deliver to halt the disease; use antihypertensives and IV magnesium to prevent eclampsia.

Trace implantation and twinning through fertilization to fetus, detailing zygote, morula, and blastocyst stages, and explain dichorionic/diamniotic, monochorionic/monoamniotic, and conjoined twins.

Bacteria always cause premature rupture of membranes; treat with penicillin and steroids. Less than 34 weeks, wait; more than 34 weeks or complications, deliver; under 32 weeks, add magnesium sulfate.

Learn how twin pregnancies arise from fertility treatments and IVF, differentiate identical from non-identical twins, and recognize signs, diet guidelines, activity, and the risk of pre-term delivery.

Learn twin pregnancy types, including monochorionic diamniotic, monoamniotic, and dichorionic diamniotic configurations, and recognize common complications like preterm labor, hyperemesis gravidarum, and twin twin transfusion syndrome.

Follow the first trimester from fertilization to week 13, detailing placenta formation, embryo growth, hormone surges, and key pregnancy signs and tests.

Explore the second trimester from week 14 to 26, detailing fetal development—eyes with fused eyelids, tear glands, hair, taste buds, and hearing—plus maternal changes.

Explore week-by-week changes in the third trimester, from fetal development and maternal symptoms like back pain, swelling, and sleep trouble to distinguishing false from true contractions and delivery readiness.

Define ectopic pregnancy as implantation outside the uterus, usually in the ampulla of the fallopian tube. Identify Kartagener syndrome as a risk factor; treat early with methotrexate, sometimes with misoprostol.

Compare Klumpke palsy and Erb palsy by their causes: lower trunk damage with hand clawing for Klumpke, and upper trunk damage with waiter’s tip posture for Erb.

Trigger hemolytic uremic syndrome by antibiotics in E coli O157 H7 infection. Provide plasmapheresis and supportive care, and avoid antibiotics and platelets; note no neurological symptoms as with TTP.

Differentiate hemolytic uremic syndrome and thrombotic thrombocytopenic purpura by decreased platelets and uremia versus neurological symptoms and ADAMTS13 deficiency, treat with plasmapheresis while avoiding platelets and antibiotics.

Examines placental abnormalities—abruption with painful bleeding, previa with painless bleeding, vasa previa, and invasion types accreta, increta, percreta—highlighting risk factors and potential hysterectomy.

Identify how deep vein thrombosis leads to pulmonary embolism as leg or pelvic clots travel to the lungs and block blood flow, an acute life-threatening event treated with anticoagulation.

Examine preload, cardiac output, and afterload to compare cardiac, hypovolemic, and fistula-related high-output states, and how arterial resistance and venous return shape circulation.

Thrombotic thrombocytopenic purpura arises from Adamts13 deficiency, triggering RBC and platelet destruction under stress; neurological symptoms are a hallmark, distinguishing it from hemolytic uremic syndrome, with plasmapheresis and avoiding platelets.

Explain stress, urgency, and overflow urinary incontinence and how a weak urethral gate or bladder hyperactivity causes leakage. Cover Kegel exercises, pessaries, bladder training, and antimuscarinics like oxybutynin.

Trace the cholesterol to pregnenolone pathway producing aldosterone, cortisol, and sex hormones, guided by enzymes such as cholesterol desmolase, 21-hydroxylase, 11β-hydroxylase, 17-hydroxylase, and aromatase.

Explain congenital adrenal hyperplasia pathways, including 21 hydroxylase deficiency with salt wasting and ambiguous genitalia, 11 beta hydroxylase deficiency with hypertension, and 17 alpha hydroxylase deficiency with low sex hormones.

Explore how PaCO2 and bicarbonate drive respiratory and metabolic acid-base changes, define alkalosis and acidosis thresholds, and teach anion gap calculation with mud piles and hardass mnemonics.

Explore active and passive immunity, detailing natural and artificial subtypes, including antibodies from mothers during gestation and vaccines, and monoclonal antibodies used in patients.

Explore lactation: prolactin drives milk production; estrogen and progesterone block receptors during pregnancy. Lift the blockade after delivery as hormones fall, enabling oxytocin-driven milk letdown and the suckling reflex.

Learn to manage menopause and perimenopause, addressing night sweats, flashes, vaginal atrophy, and moodiness with lifestyle changes, relaxation methods, and acupuncture, and decide on estrogen therapy with or without progesterone.

Identify signs of precocious puberty and assess bone age; if advanced, check pH levels, perform LH stimulation, then MRI brain for central causes or CT abdomen for peripheral origins.

Describe oogenesis and spermatogenesis, detailing diploid primary oocytes arrested in prophase I and haploid secondary oocytes arrested in metaphase II before fertilization, and outline spermatogenesis from spermatogonia to mature sperm.

Assess the newborn's health with the Apgar score on a ten-point scale at one and five minutes after birth. Use appearance, pulse, grimace, activity, and respiration to indicate pathology.

Describe breastfeeding jaundice from immature bilirubin conjugation, causing indirect bilirubin rise worsened by dehydration; continue and increase breastfeeding, with phototherapy at total bilirubin 20 and exchange therapy at 25.

Identify Edwards' syndrome as trisomy 18, with hypotonia, overlapping fingers, rocker-bottom feet, and renal anomalies such as horseshoe kidney. Quad screen shows decreased alpha fetoprotein, hCG, estriol, and inhibin.

Explore patau syndrome, a trisomy 13 condition, with features like cleft lip/palate, renal anomalies, polydactyly, and mental retardation; and quad screen markers inhibin, estriol, alpha fetoprotein, and hcg.

Turner syndrome arises from loss of one sex chromosome, leaving an X in 46 chromosomes, causing webbed neck, cystic hygroma, lymphedema, streak ovaries, short stature, and cardiovascular and renal anomalies.

The Downchild mnemonic highlights Down syndrome features and associated risks, including nondisjunction trisomy 21, duodenal atresia double bubble, hypotonia, single palmar crease, epicanthic folds, and quad test findings.

Explore prenatal Down syndrome diagnosis using the quad test and ultrasound, then confirm with invasive chorionic villus sampling or amniocentesis for a definitive karyotype.

Examine common and severe Down syndrome complications, including congenital heart defects, gastrointestinal issues, sleep apnea, obesity, atlantoaxial instability, leukemia, and early dementia risk.

Explore common breast lumps: abscesses from infection, painless cysts, fat necrosis after trauma, fibroadenoma versus lipoma, fibrocystic cyclic changes, intraductal papilloma with bloody discharge, and contraceptive pill tenderness.

Alcohol raises risk for ovarian and breast cancer; contraceptives protect ovarian cancer, but not breast cancer; BRCA testing advised if a relative under 50 has breast cancer or ovarian cancer.

Explain HPV vaccination at age 11 for both sexes and female screening: pap smear every three years from 21–30, then pap smear with HPV testing every five years after 30.

Identify carcinogens like aflatoxin, arson, vinyl chloride, benzene, asbestos, and alcohol, and their associated cancers, including liver, angiosarcoma, bladder, lung, thyroid, gastric, esophageal, and other cancers.

Explore adjuvant, neoadjuvant, salvage, induction, consolidation, and maintenance chemotherapy concepts, with examples like doxorubicin and cyclophosphamide in breast cancer.

Tumor lysis syndrome is an oncological emergency after chemotherapy, with rapid tumor cell lysis releasing potassium, phosphate, calcium, and uric acid, risking hyperkalemia, hyperphosphatemia, hypocalcemia, and hyperuricemia, and kidney injury.

Assess how tumor grading reflects cellular differentiation and mitotic activity to predict prognosis. Learn t, n, m staging, tumor size, nodal involvement, and metastasis, with c, p, or b annotations.

Discover how aldosterone from the zona glomerulosa of the adrenal cortex reabsorbs sodium and promotes water retention, signaling hypervolemia, hypertension, and heart failure in Conn's syndrome and Addison's disease.

Explain how androgens such as androstenedione, testosterone, and dihydrotestosterone differ in potency, metabolism by 5 alpha reductase and aromatase, and their clinical implications for hypogonadism.

Antidiuretic hormone regulated by hypothalamic osmoreceptors acts via V1 and V2 to vasoconstrict and raise blood volume. Desmopressin treats diabetes insipidus and nocturnal enuresis; demeclocycline and reptons correct hyponatremia.

CRH from hypothalamus triggers anterior pituitary to secrete FX, stimulating cortisol release from adrenal cortex's zona fasciculata; excess causes Cushing's syndrome and deficiency Addison's disease via negative feedback.

Explore how estrogen increases myocyte excitability, supports ovarian follicle and endometrial growth, and signals through nuclear receptors, with estradiol as the most abundant and potent form and estriol from placenta.

Menopause and perimenopause involve vasomotor symptoms, night sweats, hot flashes, vaginal atrophy, and mood changes; the course covers lifestyle strategies, estrogen therapy with or without progesterone, and SSRIs for contraindications.

Identify signs of precocious puberty and assess bone age. If bone age is advanced, test LH and PH; use brain MRI for central cases and CT abdomen for peripheral causes.

Neonatal ophthalmia outlines management: chemical irritation within one day; Neisseria by seven days; chlamydia after seven; viral after twenty; two drops in each eye with azithromycin, tetracycline, or silver nitrate.

Measles, caused by the rubeola virus of the paramyxovirus family, spreads via coughing and sneezing, presenting fever, the three c's, koplik spots, maculopapular rash, and potential encephalitis.

Differentiate common newborn rashes, including blanching nevus simplex, hemangioma with beta-blocker regression, port-wine stain (nevus flammeus), congenital melanocytic nevus, congenital melanocytosis, and cafe-au-lait spots.

Group A streptococci trigger autoimmune rheumatic fever; Jones criteria determine two major or one major and two minor symptoms, with penicillin for five years, ten years for cardiac involvement.

Explore scarlet fever, a group A streptococcal infection, marked by sandpaper rash on folds and strawberry tongue, with rapid strep test and penicillin to prevent rheumatic fever.

Differentiate Bordetella pertussis from Haemophilus influenzae by whooping cough with butterfly chest versus barking cough with steeple or thumb signs, and treat with azithromycin, noting the 100 day cough.

Bordetella pertussis, a gram-negative bacterium producing pertussis toxin, causes catarrhal, paroxysmal, convalescent stages; vaccination prevents infection, and macrolides such as azithromycin are advised for patients and contacts during catarrhal stage.

Chlamydia is an obligate intracellular organism with infectious elementary bodies and reticular bodies, diagnosable by giemsa stain or fluorescence antibodies, and treated with azithromycin or doxycycline.

Explore Clostridioides difficile infection, detailing toxin A–mediated binding, toxin B–induced cell damage, toxin-based diagnosis, pseudomembranous colitis, antibiotic risk (clindamycin), toxic megacolon, and treatments: metronidazole, vancomycin, fidaxomicin, fecal microbiota transplant.

Clostridium botulinum's exotoxin inhibits acetylcholine receptors, causing descending flaccid paralysis; adults from undercooked food, infants from honey spores; botox can relieve dystonia.

Explore four E. coli types, including haemorrhagic 0157 causing hemolytic uremic syndrome and dysentery, and enteric types causing pediatric diarrhea, traveler's diarrhea, or dysentery; treated with penicillins and cephalosporins.

Describe the eight human herpesviruses, their transmission routes, and key diseases from HSV‑1 and HSV‑2 to VZV, EBV, CMV, roseola, and Kaposi sarcoma.

Identify Legionella as an intracellular bacterium diagnosed by silver stain or charcoal agar culture; urine antigen supports diagnosis, with transmission from water or air sources and hyponatremia as a hallmark.

Listeria grows in raw meat and unpasteurized dairy, crosses the placenta, and spreads cell-to-cell with listeriolysin O and a rocket tail; immunocompromised patients face septicemia, meningitis, abortion, treated with ampicillin.

Lyme disease, caused by Borrelia and transmitted by the Exodus deer tick, progresses through three stages from erythema migrans to carditis and arthritis, with possible encephalopathy.

Memorize Pseudomonas aeruginosa features with a mnemonic, covering pneumonia in CF, sepsis, erythema gangrenosum, UTIs, otitis externa, osteomyelitis, nosocomial infections, exotoxin A, phospholipase, pyocyanin, blue-green pigment, keratitis, and antipseudomonal therapy.

Understand respiratory syncytial virus (RSV), a seasonal paramyxovirus causing upper and lower respiratory illness in children, with apnea risk in newborns; palivizumab targets the F protein.

Compare staphylococcal scalded skin syndrome, Stevens-Johnson syndrome, and toxic epidermal necrolysis, noting age patterns, mucosal involvement, extent of skin separation, and triggers.

Identify Staphylococcus aureus as a gram-positive, beta-hemolytic, catalase-positive, coagulase-positive pathogen. Describe virulence factors, including protein A and hemolysin, and its spectrum from skin infections to toxic shock and food poisoning.

Streptococcus forms long chains and releases toxins, causing scarlet fever and pus-forming infections, while M protein mimics immunity to drive rheumatic fever and post-streptococcal glomerulonephritis.

Tetanus toxin tetanospasmin targets spinal neurons and Renshaw cells, causing spastic paralysis with sardonicus, trismus, and opisthotonus; treat with antitoxins and vaccinate by two months (one month for high-risk newborns).

Delve into TORCH infections, outlining toxoplasma transmission, blueberry muffin rash, hydrocephalus, and intracranial calcifications. Explore rubella, CMV, HIV, herpes simplex 2, and syphilis with their maternal symptoms and newborn sequelae.

Chlamydia is an obligate intracellular pathogen requiring host ATP; diagnose with giemsa or fluorescence antibodies, and treat with azithromycin or doxycycline, covering trachomatis, lymphogranuloma, and psittaci.

Explore how human papillomavirus causes genital warts, their contagiousness and pregnancy-related treatment constraints, vaccination prevention, and options such as surgical excision, cryotherapy, laser therapy, and topical agents.

Compare gonococci and meningococci, intracellular gram-negative pathogens; note meningococci have a capsule while gonococci do not, and both produce IgA proteases and pili. Outline treatments from PID to meningitis.

Learn HIV prophylaxis strategies tied to CD counts, including folate inhibitors for PCP at 100 and toxoplasmosis in antibody-positive patients, itraconazole for histoplasmosis in endemic areas, and herpes zoster precautions.

Outline HIV therapy guidelines: test resistance before starting therapy, initiate first-line three-drug regimens (two RTIs and an integrase inhibitor), and manage pregnancy and newborn prophylaxis with zidovudine and PCR testing.

Understand how HPV spreads by skin-to-skin contact, can infect despite condom use, and causes contagious warts, with cervical cancer risk and vaccination at 11–12 (two doses, six months apart).