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OG2.1,OG3.1,OG4.1,OG5.1-2,OG6.1,OG7.1 | Foundations of Reproduction and Pregnancy — Graded Quiz
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During a radical hysterectomy for cervical carcinoma, the surgeon attempts to clamp the uterine artery at the level of the lateral cervix. Which complication is MOST likely if the surgeon fails to correctly identify the relevant anatomical relationship at this point?
Correct. The ureter passes under the uterine artery at the level of the lateral cervix ('water under the bridge'). Failure to identify this relationship before clamping is the most common cause of iatrogenic ureteric injury during hysterectomy. The ureter then runs forward and medially to enter the bladder.
'Water under the bridge': uterine artery (bridge) crosses above the ureter (water) at the lateral cervix. Ureteric injury is the most common serious complication of hysterectomy, caused by failure to identify this relationship.
The critical relationship is the ureter (which runs below the uterine artery at the lateral cervix). Inadvertent clamping or ligating the ureter causes ureteric injury — the most feared complication of hysterectomy. Bladder injury is also possible but requires a different mechanism.
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A 35-year-old woman undergoing laparoscopic myomectomy has a ligature placed inadvertently on the right round ligament. Which structure would be preserved despite this error, and continues to support the uterus in its normal anteversion?
Correct. Mackenrodt's (cardinal/transverse cervical) ligament is the primary support of the uterus against descent. The round ligament mainly maintains anteversion of the uterus, not prolapse prevention. Ligation of the round ligament alone would not cause significant prolapse because the cardinal and uterosacral ligaments remain intact.
Uterine support: round ligament = anteversion (not prolapse prevention). Cardinal (Mackenrodt's) + uterosacral ligaments = primary support against descent. Broad ligament = peritoneal fold, minimal structural support.
The round ligament helps maintain anteversion, not prevent prolapse. The PRIMARY support against uterine descent and prolapse comes from the cardinal (Mackenrodt's) ligament and the uterosacral ligaments, which attach the cervix and upper vagina to the pelvic sidewall and sacrum.
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A couple undergoes infertility evaluation. Semen analysis shows azoospermia. Testicular biopsy reveals complete absence of germ cells with intact Sertoli cells — 'Sertoli-cell-only' syndrome. Which hormonal pattern would you expect on serum analysis?
Correct. Sertoli cells produce inhibin B, which provides negative feedback on FSH. With no germ cells, inhibin B production is absent or severely reduced → FSH rises. Testosterone is produced by Leydig cells (not Sertoli cells), so LH and testosterone are normal. Elevated FSH with azoospermia points to primary testicular failure.
Inhibin B from Sertoli cells specifically suppresses FSH. Loss of germ cells → loss of inhibin B → elevated FSH alone. Normal LH + testosterone = intact Leydig function. This FSH-specific elevation distinguishes germ-cell failure from hypogonadotrophic hypogonadism (both low).
Sertoli cells suppress FSH via inhibin B. Without germ cells, inhibin B is absent → FSH rises unchecked. Testosterone is from Leydig cells (LH-dependent), unaffected in Sertoli-cell-only syndrome. This pattern — elevated FSH + azoospermia + normal testosterone — indicates non-obstructive azoospermia.
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A woman reports that her baby was diagnosed with a ventricular septal defect. She recalls that during the critical period of cardiac organogenesis, she was prescribed a medication by another doctor for nausea. Which drug, had it been prescribed, would carry the HIGHEST established teratogenic risk for a cardiac septal defect?
Correct. Lithium is associated with Ebstein's anomaly (a right-sided cardiac malformation — displacement of the tricuspid valve). While the relative risk is lower than historically stated, it remains the most established cardiac teratogen among these options. The cardiac teratogen window is weeks 3–8 of embryonic development.
Lithium → Ebstein's anomaly (tricuspid valve displacement). Cardiac organogenesis is weeks 3–8. Other established cardiac teratogens: alcohol (septal defects), rubella (PDA, pulmonary stenosis), thalidomide (cardiac + limb). Always obtain a full drug history at preconception and in early pregnancy.
Among these options, lithium has the most established cardiac teratogenic profile — associated with Ebstein's anomaly (tricuspid valve displacement). The cardiac structures form during embryonic weeks 3–8. Ondansetron has some signals for cleft palate in epidemiological studies but the cardiac association is with lithium.
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A 30-year-old epileptic woman on sodium valproate wishes to conceive. Her neurologist controls her seizures adequately on this drug. What is the MOST important teratogenic risk that must be discussed during preconception counselling?
Correct. Sodium valproate is strongly associated with neural tube defects (particularly spina bifida — open NTD) and also causes valproate syndrome (cognitive impairment, facial dysmorphism). High-dose folic acid (5 mg/day) is recommended, though it does not fully mitigate the NTD risk. Changing to a safer anticonvulsant (e.g. lamotrigine) before conception should be considered.
Valproate teratogenicity: NTD (spina bifida) + valproate syndrome (cognitive impairment). Give folic acid 5 mg/day. Consider drug switch (lamotrigine/levetiracetam) pre-conception. Never stop antiepileptics abruptly — risk of status epilepticus. High-dose folic acid also indicated for: previous NTD, diabetes, BMI >30, antiepileptics.
Valproate is one of the most teratogenic drugs in common use — the primary structural risk is neural tube defects (spina bifida), and it also causes fetal valproate syndrome. High-dose folic acid 5 mg/day is required but does not eliminate the risk. Preconception switch to lamotrigine or levetiracetam should be discussed.
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A 26-year-old woman with SLE on hydroxychloroquine, azathioprine, and low-dose prednisolone attends preconception counselling. Which of her medications poses the GREATEST risk for the fetus and requires a change or careful monitoring in pregnancy?
Correct. Methotrexate is an absolute contraindication in pregnancy — it is a folic acid antagonist that causes aminopterin syndrome (NTD, craniofacial defects, limb abnormalities) and abortifacient. It must be stopped at least 3 months before conception. Hydroxychloroquine is safe (and should be continued in SLE pregnancy). Azathioprine and low-dose prednisolone are generally used as the least harmful immunosuppressants in pregnancy.
SLE preconception: continue hydroxychloroquine (reduces flares, safe). Stop methotrexate ≥3 months before conception (absolute contraindication). Azathioprine + low-dose prednisolone are the preferred immunosuppressants in pregnancy. Monitor anti-Ro/La antibodies for neonatal lupus risk.
Among SLE medications, hydroxychloroquine is safe to continue in pregnancy. Azathioprine and low-dose steroids are preferred immunosuppressants in pregnancy. Methotrexate is absolutely contraindicated and must be stopped 3 months before conception (folic acid antagonist → NTD + abortifacient). The question tests awareness of what to AVOID — methotrexate is the critical answer.
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A 19-year-old student presents with a 10-week history of amenorrhoea, nausea, and breast tenderness. Urine hCG is positive. On bimanual examination, the uterus is 10-week size, soft, and the cervix is bluish. Transvaginal ultrasound shows a single live intrauterine embryo with cardiac activity. What sign accounts for the cervical colour change?
Correct. Chadwick's sign is the bluish-violet discolouration of the cervix and vagina due to increased vascularity and venous engorgement — a probable sign of pregnancy. Goodell's sign is softening of the cervix. Hegar's sign is softening of the uterine isthmus. Palmer's sign is regular uterine contractions on bimanual examination.
Chadwick's sign = blue/violet cervix and vagina (venous engorgement). Probable sign. Other probable signs: Goodell's (cervical softening), Hegar's (isthmic softening), positive hCG test, enlarged uterus. Positive signs: auscultated fetal heart, ultrasound, fetal movements felt by examiner.
Cervical bluish discolouration = Chadwick's sign (increased vascularity and venous engorgement). Goodell's = cervical softening. Hegar's = isthmic softening. Palmer's = rhythmic uterine contractions. All three (Chadwick, Goodell, Hegar) are 'probable' signs of pregnancy.
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A 25-year-old woman is 7 weeks pregnant by last menstrual period. Her serum beta-hCG is 8,000 mIU/mL but transvaginal ultrasound shows no intrauterine gestational sac. Serial hCG 48 hours later is 9,200 mIU/mL — a rise of only 15%. What is the MOST appropriate interpretation of this hCG doubling pattern?
Correct. In a normal intrauterine pregnancy, beta-hCG doubles every 48–72 hours (at least a 66% rise in 48 hours) in early pregnancy. A rise of only 15% over 48 hours is abnormally slow and — combined with no intrauterine sac above the discriminatory zone — strongly suggests an ectopic or failing pregnancy. Urgent evaluation (laparoscopy/surgical review) is required.
Serial beta-hCG: in normal IUP, rises ≥66% in 48 hours (approximate doubling time 48–72h). Suboptimal rise (<66% in 48h) + no IUP on TVU above discriminatory zone → ectopic or failing pregnancy. Falling hCG (>50% drop in 48h) suggests complete miscarriage.
Normal early IUP: hCG rises ≥66% in 48 hours (approximate doubling). A 15% rise is abnormally slow. Combined with no intrauterine sac (above the discriminatory zone of ~1,500–2,000 mIU/mL TVU), this indicates ectopic or non-viable pregnancy. This is NOT reassuring — urgent management is required.
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A pregnant woman at 28 weeks is investigated for a suspected urinary tract infection. Her serum creatinine is reported as 0.85 mg/dL (75 µmol/L). The laboratory reports this as 'within normal limits'. How should the clinician interpret this result in the context of pregnancy?
Correct. Renal plasma flow and GFR increase by 40–60% in pregnancy, causing a physiological FALL in serum creatinine. Normal pregnant creatinine is approximately 0.4–0.6 mg/dL. A value of 0.85 mg/dL — which is 'normal' by standard laboratory reference ranges — may actually represent significant renal impairment in a pregnant woman. Non-pregnant reference ranges must NOT be applied.
Pregnancy: GFR increases 40–60% → creatinine falls to ~0.4–0.6 mg/dL (normal is ~0.8–1.0 mg/dL non-pregnant). Therefore a 'normal' lab creatinine of 0.85 mg/dL in pregnancy IS abnormal. Always use pregnancy-specific reference ranges. Also: uric acid falls, albumin falls (dilutional), alkaline phosphatase rises (placental isoform).
In pregnancy, GFR increases 40–60% → creatinine falls to approximately 0.4–0.6 mg/dL. A value of 0.85 mg/dL that is 'normal' by standard ranges represents RELATIVE IMPAIRMENT in pregnancy. This is the most dangerous mistake in obstetric medicine — applying non-pregnant reference ranges to pregnant women.
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A 32-week pregnant woman presents with exertional dyspnoea. Spirometry shows a reduced functional residual capacity (FRC) and total lung capacity (TLC). Arterial blood gas shows PaCO₂ of 30 mmHg. Which statement BEST explains these findings?
Correct. The enlarging uterus elevates the diaphragm by 4 cm, reducing FRC (by ~20%) and TLC. Progesterone acts as a respiratory stimulant, increasing tidal volume and causing mild hyperventilation — PaCO₂ falls to ~30 mmHg (normal in pregnancy). This is a compensated respiratory alkalosis. These are expected physiological adaptations, not pathological findings.
Respiratory changes in pregnancy: FRC/TLC fall 20% (diaphragm elevation). Tidal volume INCREASES (progesterone). RR barely changes. Net: minute ventilation increases 40–50% → PaCO₂ falls to 30 mmHg → mild compensated respiratory alkalosis. This facilitates CO₂ transfer from fetal to maternal circulation via the double Bohr effect.
In pregnancy, the uterus elevates the diaphragm (~4 cm) → FRC and TLC FALL by ~20%. Progesterone drives hyperventilation → PaCO₂ falls to ~30 mmHg (normal in pregnancy). This compensated respiratory alkalosis facilitates CO₂ transfer from fetus to mother. These are normal pregnancy changes, not pathological findings.
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A 26-year-old primigravida at 20 weeks gestation develops supine hypotension syndrome while lying on her back for a scan. What is the underlying mechanism?
Correct. When a pregnant woman lies supine, the gravid uterus compresses the inferior vena cava (and to a lesser extent the aorta), reducing venous return to the right heart → reduced cardiac output → hypotension, dizziness, and fetal bradycardia. Relieved by left lateral tilt (15 degrees) or left lateral position.
Supine hypotension syndrome: IVC compression by gravid uterus → reduced venous return → hypotension + fetal bradycardia. Management: LEFT LATERAL TILT (15-30 degrees). This is why pregnant women >20 weeks must not be placed supine — even during CPR (manual uterine displacement is applied during resuscitation).
Supine hypotension in pregnancy is caused by the gravid uterus compressing the inferior vena cava → reduced venous return → reduced cardiac output → hypotension. This is why pregnant women after 20 weeks are nursed in left lateral tilt (15-30 degrees), not flat supine, including during resuscitation.
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A woman who had an episode of unprotected intercourse on Day 10 of her regular 28-day cycle presents 72 hours later requesting emergency contraception. Which method has the highest efficacy at this point?
Correct. The copper IUD is the most effective emergency contraception available — >99% effective when inserted within 5 days (120 hours) of unprotected intercourse. It works by inhibiting fertilisation and implantation. Additionally, it can continue as ongoing contraception for up to 10 years. Levonorgestrel is effective within 72 hours but less so than the copper IUD.
Emergency contraception efficacy: copper IUD >99% (up to 120 hours, then ongoing contraception); ulipristal acetate ~98% (up to 120 hours); levonorgestrel ~85–95% (most effective <24 hours, still given up to 72 hours). Copper IUD mechanism: inhibits fertilisation + implantation. Works even around ovulation.
The copper IUD is the MOST effective emergency contraception (>99%), effective up to 5 days post-intercourse. Levonorgestrel (Plan B) is approximately 85–95% effective within 72 hours (less effective the later it is taken). Ulipristal acetate maintains efficacy to 120 hours. The Yuzpe method is the least effective. Copper IUD is the best option overall.
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