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Sample 1·High Yield
A 24-year-old woman comes for her 6-week postpartum checkup. She is breastfeeding exclusively and has not had a period yet. She asks about contraception and wants to start a method immediately. Which method is most suitable to start at this visit?
- ACombined oral contraceptive pill
- BContraceptive patch
- ✓Progestin-only pill
- DContraceptive vaginal ring
Explanation
For breastfeeding women, progestin-only methods are preferred as they do not affect milk supply. The progestin-only pill ('mini-pill') can be started immediately postpartum. Estrogen-containing methods (combined pill, patch, ring) are typically avoided for at least the first 3-6 weeks postpartum, and often longer in breastfeeding women, due to concerns about affecting milk production and a slightly increased risk of VTE.
Sample 2·High Yield
A 19-year-old student ingests an unknown quantity of paracetamol (acetaminophen) tablets in a suicide attempt. She presents to the emergency department 4 hours after ingestion. She is asymptomatic. What is the most important next step?
- AAdminister activated charcoal.
- BStart N-acetylcysteine (NAC) infusion immediately.
- ✓Check a serum paracetamol level.
- DReassure and discharge with psychiatric follow-up.
Explanation
The management of paracetamol overdose is guided by the serum paracetamol level, plotted on the Rumack-Matthew nomogram. The blood test should be taken at least 4 hours post-ingestion to ensure absorption is complete. A: Activated charcoal is only effective if given within 1-2 hours of ingestion. B: NAC is started based on the nomogram results, not empirically at 4 hours unless the timing is unknown or presentation is late. D: Discharging the patient is unsafe without assessing the risk of hepatotoxicity.
Sample 3·High Yield
A 30-year-old male intravenous drug user is admitted with a 2-week history of fever, fatigue, and dyspnea. On examination, a new holosystolic murmur is heard best at the left lower sternal border, which increases with inspiration. Multiple septic emboli are seen on his chest X-ray. What is the most likely causative organism for his endocarditis?
- AStreptococcus viridans
- ✓Staphylococcus aureus
- CEnterococcus faecalis
- DStaphylococcus epidermidis
Explanation
Infective endocarditis in intravenous drug users (IVDU) most commonly affects the right side of the heart, particularly the tricuspid valve. Staphylococcus aureus is the most frequent causative organism in this population. A holosystolic murmur at the left lower sternal border that increases with inspiration (Carvallo's sign) is characteristic of tricuspid regurgitation. Streptococcus viridans is associated with subacute endocarditis on previously damaged native valves. Staphylococcus epidermidis is associated with prosthetic valve endocarditis.
Sample 4·High Yield
A 45-year-old construction worker in Dubai is brought to the emergency department after collapsing. He is confused and agitated with hot, dry skin. His temperature is 41.5°C, heart rate is 140/min, and blood pressure is 90/60 mmHg. What is the most critical initial step in managing this patient?
- AIntravenous administration of 0.9% saline.
- ✓Rapid external cooling with ice water immersion.
- CAdministration of intravenous diazepam for agitation.
- DObtaining a CT scan of the head.
Explanation
The patient has exertional heatstroke, a life-threatening emergency. The cornerstone of management is immediate and rapid cooling to reduce core body temperature. Ice water immersion is the most effective method. A: While IV fluids are important, they are secondary to reducing hyperthermia. C: Sedation may be necessary but does not address the primary problem. D: A CT scan is not indicated initially unless there is suspicion of a primary neurological event.
Sample 5·High Yield
A 2-week-old neonate presents with poor feeding and a temperature of 38.5°C. A full septic workup is performed, including a urine sample obtained via sterile catheterization. The urinalysis is positive for nitrites and leukocyte esterase. Which finding is the most reliable indicator of a urinary tract infection in this age group?
- APresence of nitrites on urinalysis
- BMore than 5 white blood cells per high-power field
- ✓Growth of >50,000 CFU/mL of a single uropathogen on catheterized specimen culture
- DPresence of leukocyte esterase on urinalysis
Explanation
The gold standard for diagnosing a UTI in an infant is a urine culture obtained via a sterile method (catheterization or suprapubic aspiration). A growth of ≥50,000 colony-forming units (CFU)/mL is considered diagnostic for a catheter specimen. Urinalysis findings like nitrites and leukocyte esterase are suggestive but not definitive, and nitrites are often negative in young infants who do not hold urine long enough for bacteria to convert nitrates.
