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

A low-lying placenta identified at the routine 20-week anatomy scan is common and often resolves as the pregnancy progresses. As the uterus enlarges, the lower uterine segment stretches and the placenta typically “migrates” upward relative to the internal cervical os. Therefore, immediate intervention is not indicated in an asymptomatic patient. The appropriate next step is repeat ultrasonography in the third trimester, commonly around 32 weeks’ gestation, to reassess placental location. Early recommendation of cesarean delivery is premature because many low-lying placentas identified at mid-pregnancy resolve before term. Routine activity restriction or stopping work is not indicated in the absence of bleeding. Acupuncture has no evidence-based role in placental positioning. While placenta previa is associated with painless third-trimester bleeding, at 20 weeks most cases are transient findings. MCCQE objectives emphasize appropriate follow-up of incidental ultrasound findings, avoidance of unnecessary interventions, patient reassurance, and evidence-based monitoring in obstetric care.

Recruiting participants from an autism seminar introduces selection bias. This non-random selection increases the likelihood of overestimating associations due to pre-existing beliefs or exposures in that subgroup.

Toronto Notes 2023 – Epidemiology:

“Selection bias occurs when participants are not representative of the general population, as in recruitment from disease-specific support groups.”

MCCQE1 Objectives (Population Health > 65-2: Study Design and Appraisal):

“Candidates must recognize sources of bias in epidemiologic studies, including selection bias due to non-representative recruitment.”

Recall bias (D) is more of a concern in retrospective studies. Sponsorship (B) may create perception bias but is not a flaw in methodology itself. Standard error reporting (A) is normal. Not accounting for confounders (E) matters but recruitment source is more directly biasing.

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This patient’s obstetric history suggests recurrent fetal macrosomia (birthweight > 4000–4500 g) and rapid (precipitous) labours. MCCQE objectives emphasize identifying maternal risk factors for postpartum hemorrhage (PPH) , particularly those associated with uterine atony , the most common cause of PPH. Delivery of a macrosomic infant increases uterine overdistension, which reduces effective postpartum uterine contraction and predisposes to atony and hemorrhage. In addition, precipitous labour can be associated with genital tract trauma, which can also contribute to postpartum bleeding, but the strongest and most consistent risk factor in the options provided is PPH from atony related to prior large infants.

The other choices are less supported by the stem: prior macrosomic term deliveries do not inherently increase risk of preterm delivery, gestational hypertension, or DVT. Therefore, the most likely risk to anticipate and plan for is postpartum hemorrhage, prompting proactive intrapartum planning (active management of the third stage, readiness with uterotonics, and risk-based monitoring).

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.

In a patient with known diverticular bleeding and no red flags (e.g., weight loss, anemia, family history), repeating colonoscopy is not required. Diverticular bleeding is typically self-limited. Colonoscopy within the past few years with clear findings suffices.

Toronto Notes 2023 – Gastroenterology, Lower GI Bleed:

“Patients with known diverticulosis and self-limited bleeding who have had prior complete colonoscopy do not require repeat endoscopy unless symptoms recur or persist.”

MCCQE1 Objectives – Internal Medicine > Gastroenterology:

“Candidates must recognize when no further invasive investigation is necessary in elderly patients with known benign findings and resolved symptoms.”

Option E is considerate but not clinically necessary for independent patients. Options A, B, and D are not indicated in resolved, low-risk cases.

MCCQE ELOM objectives emphasize patient safety, appropriate delegation, and respecting professional scope of practice. If a nurse states an activity is outside their scope (or they are not authorized/competent in that setting), the physician should not pressure or coerce them to perform it. Delegation requires that the delegated act is permitted by regulation and workplace policy, that the person has the competence to perform it, and that appropriate supports/medical directives exist. Supervision alone does not make an out-of-scope act acceptable, so offering to “be present” does not address the underlying legal/professional boundary. Escalating immediately to the regulator is inappropriate without first clarifying the issue locally, and simply “refraining from asking again” fails to ensure the infant receives indicated care today.

The best immediate step is to ensure timely care by administering the immunizations yourself. Afterward, discuss the matter with the nurse to clarify clinic policy, required medical directives, training/competency, and how immunizations should be handled in this practice going forward (e.g., establishing protocols so authorized staff can provide vaccines safely).

Radiation proctitis is a well-known complication of pelvic radiation therapy (e.g., for prostate cancer). It presents months to years after treatment with rectal bleeding, tenesmus, and mucosal ulceration on colonoscopy.

Toronto Notes 2023 – Gastroenterology, “Radiation-Induced GI Injury”:

“Radiation proctitis presents with rectal bleeding, tenesmus, urgency. Colonoscopy shows pale, friable mucosa, ulcerations, and telangiectasia.”

MCCQE1 Objectives (Gastroenterology > 47-2: GI Bleeding and Complications):

“Candidates must recognize radiation proctitis based on history of radiation and characteristic endoscopic findings.”

Ulcerative colitis (B) usually starts younger and is more diffuse. Diverticulosis (C) affects the left colon and causes painless bleeding. Recurrent prostate cancer (D) and rectal cancer (E) would show mass or infiltration.

A febrile neonate (≤28 days old) requires a full sepsis evaluation (e.g., blood cultures, urine testing, lumbar puncture) because of the high risk of serious bacterial infection despite a well appearance. MCCQE objectives emphasize both appropriate medical management and effective communication with parents. When caregivers are distressed about painful procedures, the best approach is empathetic communication and reassurance that adequate analgesia and comfort measures (e.g., topical anesthetic, oral sucrose, swaddling) will be provided.

Threatening child protection involvement is inappropriate unless there is clear refusal of life-saving care after thorough discussion. Saying the infant “will not remember” dismisses parental concerns and undermines trust. Proceeding without addressing concerns violates principles of shared decision-making. Excluding parents from procedures may increase anxiety and is not routinely recommended.

The physician should acknowledge concerns, explain the rationale for testing (risk of occult sepsis), outline pain-control strategies, and invite questions. This maintains trust while ensuring timely, evidence-based care.

For an otherwise healthy 60-year-old woman, screening mammography every 2 years provides the greatest proven population-health benefit among the listed options. MCCQE prevention objectives emphasize selecting screening that meaningfully reduces morbidity and mortality in the target age group. Breast cancer screening with mammography in women aged approximately 50–74 has evidence for earlier detection and reduction in breast-cancer mortality, and biennial screening balances benefit with harms (false positives, overdiagnosis) better than annual screening.

Annual cervical cytology is not recommended for average-risk women; screening intervals are longer (and discontinuation is generally considered after adequate prior screening at older ages). Bone densitometry is typically initiated later (commonly at 65) for average-risk women, with earlier testing reserved for additional risk factors. Routine annual fasting lipids and annual fasting glucose are not the most useful universal interventions in a healthy person; testing frequency is risk-based rather than yearly for all. Therefore, biennial mammography is the best choice for highest preventive value in this patient.

Obsessive-compulsive disorder (OCD) is a chronic and often relapsing condition. MCCQE objectives emphasize that patients with severe OCD requiring hospitalization or prolonged high-dose SSRI therapy are at significant risk of relapse if medication is discontinued. This patient has remained stable for 2 years on a high dose of paroxetine after inpatient treatment, suggesting a history of more severe disease.

For moderate-to-severe or recurrent OCD, long-term or indefinite maintenance pharmacotherapy is often recommended, particularly when the patient has responded well and tolerated the medication. Abrupt discontinuation or large dose reductions (e.g., 50%) increase the risk of relapse and discontinuation syndrome, especially with paroxetine, which has a short half-life. Switching to another SSRI is unnecessary when the current medication is effective and tolerated. Supportive psychotherapy alone is generally insufficient for patients with previously severe OCD.

Therefore, the most appropriate recommendation is to maintain the current dosage , while discussing risks and benefits and reassessing periodically.