This child demonstrates classic features of obsessive-compulsive disorder (OCD): intrusive contamination fears (obsession) and repetitive handwashing behaviors (compulsion) performed to reduce anxiety. The symptoms are excessive, impairing school function, and persist beyond normal developmental concerns. According to MCCQE objectives, first-line treatment for mild to moderate pediatric OCD is cognitive-behavioral therapy (CBT) with exposure and response prevention (ERP). ERP involves gradual exposure to feared contaminants while preventing the compulsive handwashing response, thereby reducing anxiety through habituation and cognitive restructuring. Pharmacologic treatment with selective serotonin reuptake inhibitors (e.g., fluoxetine) is indicated for moderate to severe cases or when CBT alone is insufficient, but it is not the preferred initial intervention when psychotherapy is accessible. Risperidone is not first-line and may be considered only as augmentation in refractory cases. Changing schools or providing a teaching assistant does not address the underlying anxiety disorder. Early evidence-based intervention improves prognosis and functional outcomes in pediatric OCD.

The findings of exophthalmos (bulging eyes), conjunctival inflammation, and periorbital swelling are hallmark features of Graves ophthalmopathy, a manifestation of autoimmune hyperthyroidism.

Toronto Notes 2023 – Endocrinology, “Thyroid Disorders”:

“Graves ophthalmopathy: proptosis, periorbital edema, conjunctivitis, and diplopia due to extraocular muscle involvement. Often independent of thyroid levels.”

MCCQE1 Objectives (Internal Medicine > 36-1: Thyroid Disease):

“Candidates must recognize and manage Graves disease and its ocular manifestations.”

Myasthenia gravis may cause diplopia but not proptosis or swelling. Pseudotumor and cellulitis are painful and acute. Allergic conjunctivitis is itchy but lacks proptosis.

Fibroadenomas can grow slightly or fluctuate in size. A minimal increase (from 1.5 cm to 1.7 cm) over six months is clinically insignificant. No malignant features are reported, and the previous biopsy confirmed benign nature. Annual follow-up is appropriate.

Toronto Notes 2023 – Obstetrics and Gynecology, “Breast Disorders” Section:

“Fibroadenomas are benign breast masses that may slightly enlarge. Routine imaging follow-up at 6 to 12 months is appropriate for lesions with benign imaging and histology.”

MCCQE1 Objectives (Obstetrics and Gynecology > 82-3: Breast Mass):

“Candidates must distinguish between benign and suspicious masses and determine appropriate intervals for follow-up imaging.”

Repeat biopsy (A) or surgery (B) is unwarranted without suspicious change. MRI (C) is not needed in stable, benign lesions. Tamoxifen (D) is not used for fibroadenomas.

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When couples face infertility-related decisions—particularly involving donor insemination—psychosocial counseling is essential. A mental health consultation helps explore emotional concerns, expectations, and readiness for non-biological parenting.

Toronto Notes 2023 – Gynecology, “Infertility and ART”:

“Psychological counseling is recommended for couples considering donor gametes to address emotional, ethical, and identity issues before proceeding.”

MCCQE1 Objectives (ELOM > Reproductive Ethics > 83-1):

“Candidates must understand the ethical and psychosocial considerations of assisted reproductive techniques and provide appropriate referrals.”

Suggesting adoption or switching care dismisses valid concerns (B, C). Ovulation induction (D) does not address azoospermia.

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This presentation most strongly suggests cocaine intoxication . MCCQE objectives emphasize recognizing toxidromes and life-threatening causes of chest pain. Cocaine is a potent sympathomimetic that increases catecholamines and causes marked hypertension, tachycardia, agitation/anxiety, tremor, tachypnea, and mydriasis , and it can precipitate severe chest pain via coronary vasospasm, increased myocardial oxygen demand, platelet activation, and potential aortic dissection. An ECG may show only sinus tachycardia early despite significant ischemic risk. In contrast, opioids (heroin, oxycodone) typically cause CNS depression, miosis , and respiratory depression. Alcohol intoxication does not usually cause extreme hypertension, mydriasis, and severe sympathomimetic agitation. Cannabis may cause anxiety and tachycardia but is less likely to produce this degree of hypertension and classic stimulant features. Therefore, cocaine best explains the combination of acute severe chest pain with a prominent sympathetic toxidrome. Immediate priorities include cardiac evaluation and treating stimulant toxicity (e.g., benzodiazepines and blood pressure control while avoiding isolated beta-blockade).

Given the lack of prenatal care, the mother ' s withdrawal, and prior involvement of child protection services, a newborn drug screen is warranted to assess for possible in utero exposure. This is part of the safety assessment.

Toronto Notes 2023 – Pediatrics, Newborn Assessment:

“Infants born to mothers with no prenatal care or prior social concerns should undergo a full newborn screening, including toxicology if indicated.”

MCCQE1 Objectives – Pediatrics > Newborn Care and Social Issues:

“Candidates must identify social risk factors and initiate appropriate newborn evaluations, including toxicology screens when substance use is suspected.”

The mother was previously immune to hepatitis B, so (A) is not immediately required. Skin-to-skin care (D) is beneficial but secondary to screening in this context. Donor milk (B) is not indicated unless breastfeeding is contraindicated.

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Comprehensive and Detailed Explanation:

Travel to rural Cambodia poses a high risk of malaria, which can be life-threatening in pregnancy. Antimalarial prophylaxis is strongly recommended for pregnant women traveling to endemic regions. Chloroquine or mefloquine (depending on resistance patterns) may be used in pregnancy under specialist guidance.

Toronto Notes 2023 – Infectious Disease / Travel Medicine:

“Malaria prophylaxis is indicated in pregnant women traveling to endemic regions. The risk of severe malaria and poor fetal outcomes is high.”

MCCQE1 Objectives (Public Health > 65-3: Travel Medicine and Pregnancy):

“Candidates must provide preventive care to pregnant travelers including vaccination and malaria prophylaxis.”

Tetanus boosters (D) are given every 10 years. Hep B Ig (B) is for acute post-exposure prophylaxis. Ciprofloxacin (C) is contraindicated in pregnancy.

Comprehensive and Detailed Explanation:

This patient has end-stage heart failure with frequent hospitalizations, progressive symptoms, and functional decline. The most appropriate next step is to initiate a goals-of-care conversation, including acknowledgment of the prognosis.

Toronto Notes 2023 – Cardiology / Palliative Care:

“In advanced heart failure with recurrent admissions and functional decline, a goals-of-care discussion should be initiated to align treatment with patient values.”

MCCQE1 Objectives (Cardiology > 34-4 / ELOM > 90-2):

“Candidates must recognize end-stage illness and provide appropriate communication and palliative care planning.”

Deactivating the defibrillator (B) may be appropriate later but should follow a goals-of-care conversation. Reassuring (C) ignores the true clinical trajectory.

The attack rate is a measure of cumulative incidence used in outbreak investigations. It represents the proportion of individuals at risk who develop the disease during a specified time period. MCCQE objectives emphasize understanding key epidemiologic measures, particularly in institutional outbreaks.

In this scenario, 163 residents were at risk during the influenza outbreak. Of these, 101 developed new-onset symptoms consistent with influenza. Therefore, the attack rate is calculated as:

Number of new cases ÷ Number of people at risk

= 101 ÷ 163

The number transferred to acute care (37) reflects disease severity but does not represent all cases. The number of deaths (17) would be used to calculate the case fatality rate (17/101), not the attack rate.

Thus, the best estimate of the attack rate among residents is 101/163 , representing the proportion of the at-risk population who became ill during the outbreak.

During an outbreak in a long-term care facility, prompt control measures include keeping symptomatic staff at home to prevent spread. Staff are often vectors of infection, and exclusion is a key public health intervention.

Toronto Notes 2023 – Infectious Diseases, “Infection Control and Prevention”:

“During influenza outbreaks in institutional settings, exclusion of symptomatic staff is critical to controlling spread.”

MCCQE1 Objectives (Population Health > 63-2: Outbreak Management):

“Candidates must understand outbreak control, including staff exclusion, cohorting, and surveillance in congregate settings.”

Vaccination (B) is preventive but not immediately effective during an outbreak. Masking and visitor vaccination are supportive but secondary measures.