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

This patient has classic acute pericarditis : pleuritic chest pain relieved by sitting forward, a pericardial friction rub, diffuse ST-segment elevation with PR depression on ECG, and a small pericardial effusion on echocardiogram. MCCQE objectives emphasize recognizing the characteristic clinical and ECG features that distinguish pericarditis from myocardial infarction (diffuse ST elevation rather than territorial changes).

First-line treatment for uncomplicated acute pericarditis is high-dose nonsteroidal anti-inflammatory therapy , such as acetylsalicylic acid (ASA) or ibuprofen, often combined with colchicine to reduce recurrence risk. ASA is particularly appropriate when ischemia is in the differential diagnosis.

Apixaban (anticoagulation) is not indicated and may worsen effusion. Pericardiocentesis is reserved for large effusions or cardiac tamponade. Levofloxacin is unnecessary without evidence of bacterial infection. Beta-blockers such as metoprolol do not treat pericardial inflammation.

Thus, high-dose acetylsalicylic acid is the most appropriate initial management for uncomplicated acute pericarditis.

This elderly man has classic lower urinary tract symptoms (LUTS) suggestive of benign prostatic hyperplasia (BPH) : hesitancy, straining, and incomplete emptying (obstructive symptoms). MCCQE objectives emphasize recognizing obstructive voiding symptoms in older men as most commonly due to prostatic enlargement causing bladder outlet obstruction.

First-line pharmacologic therapy for symptomatic BPH is an alpha-1 adrenergic receptor blocker (e.g., tamsulosin), which relaxes smooth muscle in the prostate and bladder neck, thereby improving urinary flow and reducing obstruction. Tamsulosin works relatively quickly and is appropriate for symptomatic relief.

Nitrofurantoin treats urinary tract infections, which are not suggested here. Fesoterodine is an antimuscarinic used for overactive bladder and could worsen urinary retention in obstructive BPH. Empagliflozin (an SGLT2 inhibitor) increases urinary glucose excretion and may worsen urinary frequency. Hydrochlorothiazide increases urine output and would not relieve obstructive symptoms.

Therefore, tamsulosin is the most appropriate medication to improve this patient’s symptoms.

Accurate determination of gestational age is essential, particularly in suspected preterm labour at 24 weeks. MCCQE objectives emphasize that first-trimester ultrasound , specifically measurement of the crown-rump length (CRL) at 8–12 weeks , is the most reliable method for dating a pregnancy. In early gestation, biological variation in fetal size is minimal, making CRL highly accurate (±3–5 days).

Dating by last menstrual period (LMP) is less reliable due to recall error, irregular cycles, or ovulation variability. Second-trimester ultrasound provides reasonable accuracy but is less precise than first-trimester CRL (±7–10 days). Third-trimester ultrasound is the least accurate for dating because fetal growth variation increases significantly (±2–3 weeks). Symphysis-fundal height is useful for monitoring growth trends but not for precise dating.

In preterm labour management, correct gestational age influences decisions about corticosteroids, magnesium sulfate for neuroprotection, and neonatal resuscitation planning. Therefore, first-trimester CRL measurement is the gold standard for establishing gestational age.

A molar pregnancy (gestational trophoblastic disease) is the most likely diagnosis because the β-hCG level is markedly elevated (300,000 IU/L) for an 8-week gestation, far exceeding typical levels for a normal intrauterine pregnancy. MCCQE objectives highlight that unusually high β-hCG—often accompanied by first-trimester bleeding—should raise strong suspicion for a hydatidiform mole. Bleeding is common due to abnormal trophoblastic proliferation and placental separation. A closed cervix does not exclude a molar pregnancy; it simply indicates that products of conception are not being expelled at the time of exam.

Ectopic (tubal) pregnancy more often presents with abdominal/pelvic pain and typically has lower or inappropriately rising β-hCG. Incomplete abortion usually features heavier bleeding, cramping, and an open cervix. Threatened abortion involves bleeding with a closed cervix but does not explain an extremely high β-hCG. Implantation bleeding occurs earlier (around the time of missed menses), not at 8 weeks, and would not be associated with very high β-hCG.

The most appropriate response is to recommend vaccination and explain that the risk of intussusception after rotavirus vaccination is extremely low , while the benefits in preventing severe rotavirus gastroenteritis are substantial. MCCQE objectives in immunization and preventive pediatrics emphasize balancing risks and benefits using evidence-based data. Current rotavirus vaccines are associated with a very small increased risk of intussusception (on the order of a few additional cases per 100,000 vaccinated infants), but this risk is far outweighed by the prevention of hospitalizations, severe dehydration, and complications from rotavirus infection.

Option B overstates the risk as “markedly increased,” which is inaccurate and may heighten parental anxiety. Intussusception is not always easily treatable and can be serious (C). It occurs most commonly in infants under 1 year, not only in 1- to 3-year-olds (D). Rotavirus can cause significant morbidity in healthy infants, so routine vaccination is recommended (E). Clear, balanced counselling supports informed parental decision-making.

Comprehensive and Detailed Explanation:

This patient has tardive dyskinesia, a late-onset, often irreversible movement disorder caused by chronic dopamine receptor blockade (e.g., haloperidol). It is especially common in older adults and may not resolve after stopping the drug.

Toronto Notes 2023 – Psychiatry, “Extrapyramidal Symptoms”:

“Tardive dyskinesia is often irreversible and typically occurs after prolonged antipsychotic use. Elderly patients are at greater risk.”

MCCQE1 Objectives (Psychiatry > 71-5: Side Effects of Psychotropics):

“Candidates must recognize tardive dyskinesia and understand that it can persist or worsen even after discontinuation of antipsychotics.”

Anticholinergics may worsen it (D). The condition does not reliably improve with age (C). It does not affect a majority of patients (A).

This infant has evidence of urinary outflow obstruction on ultrasound. The most common cause in male infants is posterior urethral valves. Poor urinary stream is a hallmark symptom of bladder outlet obstruction in neonates.

Toronto Notes 2023 – Pediatrics, “Pediatric Urology” Section:

“Posterior urethral valves should be suspected in male infants with recurrent UTIs, hydronephrosis, and a weak urinary stream. Diagnosis is confirmed by voiding cystourethrogram.”

MCCQE1 Objectives (Pediatrics > 78-4: Urinary Tract Abnormalities):

“Candidates must identify congenital causes of urinary obstruction. Poor stream and hydronephrosis are classic features of posterior urethral valves.”

Crying with urination (E) is nonspecific. Hematuria (B) and malodorous urine (D) are common with infections. Circumcision (A) is unrelated.

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This presentation is most consistent with somatic symptom disorder/illness anxiety : persistent distressing physical symptoms (abdominal pain/constipation) with excessive health-related anxiety, repeated reassurance-seeking, and “doctor shopping” despite normal investigations. MCCQE objectives emphasize avoiding iatrogenic harm from repeated testing and using a structured, therapeutic relationship to manage medically unexplained or disproportionate symptom concerns. The best next step is regularly scheduled follow-up visits with one consistent physician (e.g., monthly), focused on validating symptoms, addressing fears, monitoring for new objective findings, and gradually shifting toward coping strategies and functional goals. This approach reduces unnecessary investigations, reinforces continuity, and helps interrupt the cycle of anxiety-driven health-care utilization.

Repeating investigations (B) perpetuates reassurance-seeking and increases false positives and harm. Consulting additional specialists (A) without new red flags similarly reinforces maladaptive beliefs and fragmentation of care. Exercise (D) may be beneficial as an adjunct but is not the core management strategy. Therefore, planned, regular appointments are the most appropriate next step.

Comprehensive and Detailed Explanation:

The child’s presentation (weight gain, short stature, truncal obesity, facial swelling, hypertrichosis) is classic for Cushing syndrome. One of the hallmark findings on physical examination in pediatric Cushing syndrome is hypertension, due to increased cortisol-mediated mineralocorticoid receptor activation.

Toronto Notes 2023 – Pediatrics / Endocrinology:

“Cushing syndrome in children presents with growth failure, weight gain, moon facies, truncal obesity, and hypertension.”

MCCQE1 Objectives (Pediatrics > 77-2: Endocrine Disorders in Children):

“Candidates must identify clinical signs of hypercortisolism and evaluate for associated findings such as elevated blood pressure.”

Café-au-lait spots (A) suggest neurofibromatosis. Goiter (C) is more related to thyroid dysfunction. Hepatomegaly (D) and acanthosis (E) are more commonly seen in metabolic syndrome or insulin resistance.

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Comprehensive and Detailed Explanation:

This patient is likely experiencing extrapyramidal symptoms (dysphagia/dystonia) due to haloperidol. Switching to an atypical antipsychotic (like quetiapine), which has a lower risk of EPS, is appropriate. Dysphagia in the context of antipsychotic use requires prompt medication review.

Toronto Notes 2023 – Psychiatry, “Antipsychotics and Extrapyramidal Effects”:

“Dysphagia can be a sign of extrapyramidal side effects. Consider switching to an atypical antipsychotic with lower EPS risk.”

MCCQE1 Objectives (Psychiatry > 71-5: Antipsychotic Adverse Effects):

“Candidates must recognize and manage EPS, including drug-induced dysphagia.”

Dantrolene (C) is for neuroleptic malignant syndrome, not isolated dysphagia. Laryngoscopy (B) may be useful later but not first-line. Reassurance (D) is unsafe. Lorazepam (E) may help in dystonia but doesn ' t address the root cause.