Pass the Medical Council of Canada MCCQE Part 1 MCCQE Questions and answers with ExamsMirror

Valproic acid is well known to cause thrombocytopenia, especially at higher serum concentrations or in patients over 60. Bruising with platelet count < 100 × 10⁹/L is a classic manifestation.

Toronto Notes 2023 – Psychiatry, Mood Disorders & Pharmacology Section:

“Valproic acid is associated with hematologic side effects including thrombocytopenia. Platelet counts should be monitored regularly.”

MCCQE1 Objectives – Psychiatry > Pharmacotherapy:

“The candidate must recognize adverse effects of mood stabilizers including hematologic complications of valproic acid.”

Other listed medications (A–D) have no common or direct link with thrombocytopenia in this context.

Stimulants like methylphenidate can increase heart rate and blood pressure. In patients with cardiovascular risk (e.g., hypertension, nephropathy), stimulants should not be increased without first addressing elevated blood pressure.

Toronto Notes 2023 – Psychiatry, “ADHD in Adults”:

“Stimulants can exacerbate hypertension and must be used cautiously. Evaluate cardiovascular risk factors and control blood pressure before dose increases.”

MCCQE1 Objectives (Psychiatry > 71-1: ADHD):

“Candidates must consider the cardiovascular risks of stimulant therapy and monitor for hypertension prior to adjusting doses.”

While poor glycemic control (B) and renal disease (A) are important, BP control is most critical for immediate stimulant safety.

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Comprehensive and Detailed Explanation:

Complex endometrial hyperplasia with atypia carries a high risk of progression to or concurrent endometrial carcinoma. Definitive management in postmenopausal women is total hysterectomy with bilateral salpingo-oophorectomy.

Toronto Notes 2023 – Gynecology, Abnormal Uterine Bleeding:

“Endometrial hyperplasia with atypia in postmenopausal women is best managed surgically due to the risk of malignancy.”

MCCQE1 Objectives – Gynecology > Postmenopausal Bleeding:

“Candidates should identify endometrial hyperplasia with atypia as an indication for hysterectomy in appropriate patients.”

Ablation (A) is contraindicated. Progesterone (B) is used for non-atypical hyperplasia. D & C (C) and hysteroscopy (D) are diagnostic but not definitive.

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This case addresses informed consent and professional integrity. MCCQE ELOM objectives emphasize that competent patients have the right to refuse recommended treatment, but they cannot demand a treatment that is medically inappropriate or contrary to the standard of care. If a proposed intervention (e.g., bypass of a strictured Crohn segment expected not to heal) is not clinically indicated and may cause harm, the physician is not ethically obligated to provide it.

The appropriate response is to decline to perform the inappropriate procedure while clearly explaining the rationale, including risks, benefits, alternatives, and likely outcomes. Shared decision-making and addressing the patient’s fears (e.g., risk of short bowel syndrome) are essential. If disagreement persists, offering a second opinion is reasonable—but transferring care solely to find someone willing to perform an inappropriate surgery is unethical.

A formal competency assessment is unnecessary unless there is evidence of impaired decision-making capacity. Performing a different surgery than agreed upon would violate consent. The physician must balance respect for autonomy with nonmaleficence and adherence to evidence-based practice.

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.

The clinical presentation of mild prodromal symptoms followed by oral lesions in a school-aged child is most consistent with a viral stomatitis such as primary herpes simplex virus (HSV-1) infection. HSV-1 is highly contagious and is transmitted primarily through direct contact with infected oral secretions. According to MCCQE objectives on pediatric infectious diseases, prevention of transmission relies on appropriate infection control measures, particularly avoidance of sharing utensils, cups, toothbrushes, and minimizing direct contact such as kissing during the active lesion phase. Antibiotics are not indicated because this is a viral infection. Routine antiviral prophylaxis for healthy siblings is not recommended. Varicella vaccination is unrelated to HSV infection and would not prevent spread. The condition is contagious, especially when lesions are present and viral shedding occurs. Therefore, counseling families regarding strict hand hygiene and avoidance of direct contact with oral secretions is the most appropriate preventive strategy.

The most important factor in determining the surveillance interval in Barrett esophagus is the presence and grade of dysplasia (e.g., none, low-grade, high-grade). High-grade dysplasia requires more frequent monitoring or intervention due to the risk of progression to esophageal adenocarcinoma.

Toronto Notes 2023 – Gastroenterology, Barrett Esophagus:

“Surveillance intervals depend on histologic findings. No dysplasia: q3–5 years; low-grade: q6–12 months; high-grade: consider endoscopic resection or ablation.”

MCCQE1 Objectives – Internal Medicine > Gastroenterology:

“Candidates must identify the risk of progression in Barrett esophagus and apply appropriate surveillance strategies based on dysplasia.”

Length of the segment (A) may influence risk but not surveillance frequency alone. Other options (B, C, E) are less determinative.

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Physicians should order investigations only when clinically indicated based on their own assessment and an evidence-based differential diagnosis, not solely at the request of a non-physician practitioner. The appropriate next step is to decline to order the requested tests as written and perform (or arrange) a proper evaluation of the patient’s chronic back pain, including red-flag screening, functional impact, and prior work-up/treatments. This aligns with MCCQE objectives on stewardship of health resources and professional accountability: unnecessary testing can cause harm (false positives, downstream procedures) and misuses publicly funded services. Sending results to a reflexologist as “other doctor” is also inappropriate without confirming the person’s role, ensuring relevance to care, and obtaining appropriate patient consent for disclosure; even with consent, the physician should not facilitate non-indicated testing. Reporting (A/B) or directing the patient to stop (E) is premature; the initial focus should be patient-centred care, education about evidence-based options, and collaborative planning while respecting patient autonomy and addressing potential safety concerns.

This presentation is classic for Zenker diverticulum, characterized by progressive dysphagia, regurgitation of undigested food, coughing, and halitosis due to food retention in a pharyngoesophageal pouch. Symptoms are chronic and episodic, often involving regurgitation hours after eating. MCCQE objectives emphasize selecting the safest and most appropriate diagnostic test. The best initial test is a barium swallow (contrast esophagram), which clearly visualizes the posterior outpouching above the upper esophageal sphincter.

Endoscopy is not the first step because there is a risk of perforation if a large diverticulum is present. pH monitoring and PPI trials are used for gastroesophageal reflux disease, which does not explain regurgitation of undigested food and halitosis. CT chest is unnecessary for diagnosis.

Therefore, a barium swallow is the safest and most informative investigation to confirm suspected Zenker diverticulum before considering surgical or endoscopic management.

Comprehensive and Detailed Explanation:

Providing clinical advice (particularly treatment advice) without formally seeing or evaluating the patient creates a physician-patient relationship, potentially establishing a duty of care. If the advice leads to harm, you could be found liable, even if you never saw the patient directly.

Toronto Notes 2023 – Legal Medicine:

“Giving specific medical advice about diagnosis or treatment may imply a physician-patient relationship and establish duty of care.”

MCCQE1 Objectives (ELOM > 90-2: Legal Risk Management):

“Candidates must understand that liability can arise from informal consultations where medical advice is given.”

Providing advice (D) is riskier than simply hearing about a case or patient (A, C). Recommending consultation (B) does not establish duty of care. Not seeing the patient (E) does not automatically shield from liability if treatment advice was given.

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