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

This pregnancy demonstrates fetal growth restriction (FGR) with biometric measurements at or below the 10th percentile and oligohydramnios (AFI 5 cm). Most concerning is the finding of reversed end-diastolic flow (REDF) in the umbilical artery Doppler, which indicates severe placental insufficiency and significantly increased risk of fetal hypoxia, acidosis, and intrauterine demise. MCCQE objectives emphasize that abnormal umbilical artery Doppler findings—particularly absent or reversed end-diastolic flow—represent critical fetal compromise.

At 37 weeks’ gestation, the fetus is term. The risks of continued intrauterine exposure in the setting of REDF outweigh the risks of delivery. Therefore, immediate delivery is indicated. Expectant management with nonstress testing or delayed reassessment is inappropriate because REDF is associated with high perinatal mortality.

Prompt delivery (often by cesarean section depending on fetal status and cervical factors) is required to prevent stillbirth and severe neonatal morbidity.

Comprehensive and Detailed Explanation:

In postpartum hemorrhage with a firm uterine fundus and intact placenta, a common cause is trauma such as a vaginal or cervical tear. Uterine atony (A) typically presents with a boggy uterus. The absence of systemic instability or coagulopathy makes options D and E less likely.

Toronto Notes 2023 – Obstetrics, Postpartum Hemorrhage:

“Continued bleeding despite a firm fundus and intact placenta should raise suspicion for genital tract trauma, especially cervical or vaginal lacerations.”

MCCQE1 Objectives – Obstetrics > Postpartum Complications:

“Candidates must differentiate causes of postpartum hemorrhage and identify when bleeding is due to trauma vs uterine atony.”

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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.

The key issue is patient confidentiality and informed consent for disclosure of identifiable information . Although the patient consented to having the image taken and uploaded to the medical record, consent for photography does not automatically extend to sharing the image with external parties , especially through informal channels. MCCQE objectives emphasize that physicians must obtain specific consent for disclosure , including the purpose, recipient, and method of transmission, unless the information is fully anonymized and non-identifiable. Clinical photographs may still be identifiable even if names are removed.

Texting the image, even if anonymized, risks breaching privacy and may not meet security standards. Simply refusing to share any photos is unnecessary because consultation is appropriate with consent. Even sending through a secure portal requires proper patient authorization for that specific disclosure.

Therefore, the appropriate next step is to contact the patient and obtain explicit consent to share the photograph with the identified physician for consultation, ensuring documentation of that consent and use of secure transmission methods thereafter.

The image shows an asymmetrical light reflex (corneal light reflex not centered in both eyes), which is diagnostic of strabismus. This misalignment of the eyes must be treated early to prevent amblyopia (lazy eye).

Toronto Notes 2023 – Pediatrics, Ophthalmology:

“Strabismus presents with misaligned visual axes. The Hirschberg light reflex is off-center in the affected eye. Prompt referral is necessary to prevent amblyopia.”

MCCQE1 Objectives – Pediatrics > Vision and Developmental Disorders:

“Candidates must recognize strabismus on visual screening and refer early for correction to prevent permanent vision impairment.”

Pseudostrabismus (B) can be ruled out here because the light reflex is not symmetric. Ptosis (A) involves drooping of the eyelid, which is not evident. Cataracts (D) would typically present with a leukocoria (white reflex), not misalignment.

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This scenario raises end-of-life ethics: balancing relief of suffering with the prohibition against intentionally hastening death. MCCQE ELOM objectives emphasize compassionate communication, capacity, consent, and appropriate use of palliative interventions. The immediate best step is to acknowledge the family’s distress, explore what they are witnessing (pain, dyspnea, agitation, delirium), and reassure them that you will continue to prioritize the patient’s comfort.

Options B and C are inappropriate because the family cannot authorize “expediting death,” and MAID requires a voluntary request from the patient with decision-making capacity (and other legal safeguards); a substitute decision-maker cannot request MAID on the patient’s behalf. Option D (midazolam for deep sedation) may be appropriate only if the patient has refractory symptoms despite optimal treatment and after careful assessment, consent discussions (with the patient if capable or SDM for goals-of-care), and proportional dosing aimed at symptom relief—not to cause death.

Therefore, the ethically correct next step is supportive, clarifying communication and reassessment of symptom control.

Ramipril, an ACE inhibitor, is contraindicated in pregnancy due to risks of fetal renal dysgenesis, oligohydramnios, and fetal death, especially in the second and third trimesters.

Toronto Notes 2023 – Obstetrics, Hypertensive Disorders of Pregnancy:

“ACE inhibitors and ARBs are contraindicated in pregnancy due to their teratogenic potential and adverse fetal effects.”

MCCQE1 Objectives – Obstetrics > Hypertension in Pregnancy:

“Candidates must identify safe antihypertensives during pregnancy and contraindicated medications such as ACE inhibitors and ARBs.”

Methyldopa, labetalol, nifedipine, and hydralazine are considered safe and are commonly used in pregnancy.

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Comprehensive and Detailed Explanation:

Publication bias refers to the tendency for positive results to be published more often than negative or inconclusive ones. In your review, 3 of 4 studies show positive findings. However, studies showing no effect may not have been published, skewing your impression.

Toronto Notes 2023 – Public Health, Critical Appraisal:

“Publication bias can lead to overestimation of treatment efficacy. Systematic reviews must account for unpublished or negative findings.”

MCCQE1 Objectives – Preventive Medicine > Critical Appraisal:

“Candidates must recognize and account for biases such as publication bias in interpreting literature.”

Random error (A) and power (D) affect individual studies. Systematic and information biases (B, E) affect data quality, not publication trends.

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This patient is in septic shock, likely from pyelonephritis, with hypotension, tachycardia, and fever. Her laboratory findings demonstrate thrombocytopenia (platelets 85 × 10⁹/L), elevated INR, very low fibrinogen ( < 1 g/L), and schistocytes on blood film, along with active bleeding from the central line site. These findings are classic for disseminated intravascular coagulation (DIC).

MCCQE objectives emphasize recognizing DIC as a complication of severe sepsis. In DIC, systemic activation of coagulation leads to widespread microthrombi formation and consumption of platelets and clotting factors (consumptive coagulopathy), resulting in both thrombosis and bleeding. Low fibrinogen and prolonged INR are key distinguishing features.

ITP causes isolated thrombocytopenia without coagulation abnormalities. TTP presents with thrombocytopenia and schistocytes but typically has normal coagulation studies. Heparin-induced thrombocytopenia requires prior heparin exposure and does not cause elevated INR or low fibrinogen. Vitamin K deficiency causes prolonged INR but does not produce thrombocytopenia or schistocytes.

Thus, DIC secondary to sepsis is the most likely cause of her bleeding.

This patient has a Stanford type B aortic dissection , involving the descending thoracic aorta distal to the left subclavian artery, with no evidence of branch vessel compromise or rupture. MCCQE objectives emphasize that uncomplicated type B dissections are managed medically , whereas type A dissections (ascending aorta) require urgent surgical repair.

The immediate priority is to reduce shear stress on the aortic wall by controlling heart rate and blood pressure . Intravenous beta-blockers such as labetalol or esmolol are first-line therapy. The goal is to reduce heart rate to approximately 60 bpm and lower systolic blood pressure to 100–120 mm Hg. This decreases the force of left ventricular contraction (dP/dt), limiting propagation of the dissection.

Endovascular or open repair is reserved for complicated cases (e.g., malperfusion, rupture, refractory pain, uncontrolled hypertension). Anticoagulation with heparin is contraindicated due to bleeding risk. Observation alone without blood pressure control is inappropriate.

Therefore, intravenous labetalol is the best next step.