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| Section | Objectives |
|---|---|
| Topic 1: Physician Activities | - Professionalism
|
| Topic 2: Dimensions of Care | - Health Promotion and Illness Prevention
|
>> Medical Council of Canada MCCQE Latest Dumps Free <<
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NEW QUESTION # 235
A 6-year-old boy is brought to the Emergency Department by his daycare provider because he has an injured left arm. Physical examination findings show a swollen left arm just below the shoulder and bruising around both knees and the upper right arm. Radiographs of the left arm show a fracture with early callus formation around the proximal humeral shaft. Which one of the following is the most important next step?
Answer: A
Explanation:
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.
NEW QUESTION # 236
A 25-year-old woman presents to the Emergency Department with a 4-hour history of severe left flank pain.
Her vital signs are as follows:
* Heart rate: 94/min
* Blood pressure: 130/80 mm Hg
* Temperature: 37.3 °C
A non-contrast computed tomography shows a 6 mm stone in the distal left ureter with mild associated hydronephrosis. In addition to appropriate analgesia, which one of the following is the best next step?
Answer: E
Explanation:
Alpha blockers such as tamsulosin can facilitate the passage of ureteral stones, especially those between 5-10 mm. This is part of medical expulsive therapy.
Toronto Notes 2023 - Urology, Nephrolithiasis:
"Alpha blockers help relax the ureteral smooth muscle and improve stone passage in symptomatic distal ureteral stones." MCCQE1 Objectives - Surgery > Urologic Emergencies:
"Candidates should initiate medical expulsive therapy for ureteral stones under 10 mm with alpha blockers." Reassurance alone (A) is inadequate. Antibiotics (B) are not indicated without infection. IV fluids (E) do not significantly aid stone passage. Urology consult (D) is not needed unless there's infection, intractable pain, or obstruction.
NEW QUESTION # 237
A 17-year-old boy presents to your clinic with a 6-month history of recurrent headaches. The headaches are excruciating, and he describes them as a stabbing pain, usually around his right eye. They occur several times daily for 2 to 3 weeks and recur every few months. The headaches are associated with tearing from his right eye and tend to get worse when he is overtired. Which one of the following is the most likely diagnosis?
Answer: C
Explanation:
The classic description of brief, severe unilateral periorbital pain with autonomic symptoms (tearing), occurring in clusters (same time daily for weeks), is diagnostic of cluster headache.
Toronto Notes 2023 - Neurology, "Headaches":
"Cluster headaches: severe unilateral periorbital pain, often with lacrimation, nasal congestion, occurring in clusters over weeks. More common in young males." MCCQE1 Objectives (Internal Medicine > 35-2: Headache Disorders):
"Candidates must distinguish among headache types based on duration, pattern, and associated symptoms." Migraine tends to last hours and has nausea or photophobia. Sinusitis causes dull, pressure-like pain. Tumour- related headache is progressive and worse with Valsalva. Post-concussive headache would have trauma history.
NEW QUESTION # 238
An 80-year-old woman presents to the Emergency Department with dizziness. She has a medical history of coronary artery disease. On examination, she is alert and oriented. Her vital signs are as follows:
Her electrocardiogram is shown in the image.
Which one of the following is the most likely diagnosis?
Blood pressure
80/60 mm Hg
Heart rate
40/min
Respiratory rate
12/min
Her electrocardiogram is shown in the attached image. Which one of the following is the most likely diagnosis?
Answer: B
Explanation:
Comprehensive and Detailed Explanation:
The ECG reveals:
* Regular P waves that are not consistently followed by QRS complexes
* A dissociation between the atrial (P wave) and ventricular (QRS complex) activity
* A slow ventricular rate (~40 bpm) independent of atrial rate
These findings are characteristic of a third-degree (complete) atrioventricular (AV) block, where there is no conduction of atrial impulses to the ventricles. The atria and ventricles beatindependently, and the ventricular rate is maintained by an escape rhythm, often junctional or ventricular in origin.
This correlates with the patient's symptoms (dizziness, hypotension) and bradycardia, suggesting inadequate cardiac output due to AV dissociation.
Toronto Notes 2023 - Cardiology:
"Third-degree AV block shows complete AV dissociation with independent atrial and ventricular activity. It typically presents with bradycardia and hypotension. Urgent pacing may be required." MCCQE1 Objectives (Cardiology > 34-2: Bradyarrhythmias and Conduction Disorders):
"Candidates must identify complete heart block and recognize its clinical urgency." Ruling out other options:
* A. Sinus bradycardia would show regular P waves with 1:1 P-QRS conduction.
* B. First-degree AV block has prolonged PR intervals (>200 ms) but all P waves are conducted.
* D. Junctional escape rhythm may present with bradycardia, but P waves would be absent, inverted, or occur after QRS complexes.
* E. Mobitz type I (Wenckebach) has progressively lengthening PR intervals before a dropped QRS.
NEW QUESTION # 239
You are called to the Emergency Department to see a 6-month-old boy with a 3-day history of fever. Physical examination reveals an irritable infant with a temperature of 38.1°C. His vital signs are:
Blood pressure: 87/50 mm Hg
Respiratory rate: 80/min
Heart rate: 140/min
Oxygen saturation: 92% on room air
The infant has no skin findings. On chest examination, you hear coarse crackles on the right side of the chest.
Which one of the following is the best next step in the management of this child?
Answer: E
Explanation:
This 6-month-old presents with signs of systemic illness, tachypnea, hypoxia, and focal lung findings. In this age group, pneumonia can rapidly progress, and given the severity of symptoms, oral treatment is insufficient.
Intravenous antibiotics are urgently indicated.
Toronto Notes 2023 - Pediatrics, Respiratory Infections in Infants:
"Infants under 6 months with signs of systemic illness, hypoxia (SpO2 < 94%), and respiratory distress should receive IV antibiotics. Delayed treatment may result in rapid clinical deterioration." MCCQE1 Objectives - Pediatrics > Respiratory Conditions:
"Candidates must recognize signs of serious lower respiratory tract infection in infants and initiate prompt IV antibiotic therapy when criteria for hospitalization are met." Oral antibiotics (C) are appropriate for mild outpatient pneumonia. Reassurance (B) and oral steroids (A) are inappropriate. IV fluids (D) may be supportive but do not address the infectious cause.
NEW QUESTION # 240
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