COMSAE Phase 1 Form 116 Exam Test
Bank – Newest 2026 Edition |
Comprehensive 176-Question Set with
Verified Answers & Detailed Rationales
Question 1
A 58-year-old man with a 40-pack-year smoking history presents to the
emergency department with acute-onset shortness of breath and sharp
right-sided chest pain that worsens with inspiration. His heart rate is 110
bpm, respiratory rate is 26/min, and oxygen saturation is 89% on room
air. On examination, breath sounds are diminished on the right side, and
percussion is hyperresonant. Which of the following is the most
appropriate next step in management?
A. Needle decompression of the right chest
B. Emergent endotracheal intubation
C. Administration of alteplase (tPA)
D. Placement of a right-sided chest tube
Correct ,,,,answer,,,: D. Placement of a right-sided chest tube
Rationale: This patient presents with the classic features of a
spontaneous pneumothorax: acute dyspnea, pleuritic chest pain,
tachypnea, tachycardia, hypoxia, and diminished breath sounds with
,hyperresonance on percussion. Given his significant smoking history, he
is at increased risk for spontaneous pneumothorax due to rupture of
subpleural blebs. The oxygen saturation of 89% indicates a large
pneumothorax causing significant physiologic compromise. While
needle decompression (A) is indicated for tension pneumothorax, this
patient does not exhibit the hallmark signs of tension physiology such as
tracheal deviation, jugular venous distention, or hypotension. Emergent
intubation (B) is not indicated as the primary management and could
actually worsen the pneumothorax if positive pressure ventilation is
initiated without first decompressing the chest. Alteplase (C) is used for
massive pulmonary embolism, not pneumothorax. The definitive
management for a large, symptomatic spontaneous pneumothorax is tube
thoracostomy (chest tube placement), which allows continuous
evacuation of air from the pleural space and re-expansion of the lung.
Question 2
A 45-year-old woman presents with a three-month history of progressive
weakness in her proximal upper and lower extremities. She reports
difficulty rising from a seated position and brushing her hair. On
physical examination, she has symmetric proximal muscle weakness and
a heliotrope rash on her eyelids. Laboratory studies reveal an elevated
creatine kinase level. Which of the following autoantibodies is most
specifically associated with this condition?
A. Anti-Jo-1 antibody
B. Anti-SSA/Ro antibody
C. Anti-Smith antibody
D. Anti-centromere antibody
,Correct ,,,,answer,,,: A. Anti-Jo-1 antibody
Rationale: This patient's presentation of proximal muscle weakness,
difficulty with activities of daily living, and the characteristic heliotrope
rash (purple discoloration of the eyelids) is classic for dermatomyositis.
Dermatomyositis is an idiopathic inflammatory myopathy characterized
by symmetric proximal muscle weakness and characteristic skin
findings. Elevated creatine kinase confirms muscle damage. Anti-Jo-1
antibody is an antisynthetase antibody that is highly specific for
dermatomyositis and polymyositis, particularly in patients who also have
interstitial lung disease, arthritis, or Raynaud phenomenon. Anti-
SSA/Ro (B) is associated with Sjögren syndrome and subacute
cutaneous lupus erythematosus. Anti-Smith (C) is highly specific for
systemic lupus erythematosus but is not associated with myositis. Anti-
centromere antibody (D) is associated with the limited cutaneous form
of systemic sclerosis (CREST syndrome). While not all patients with
dermatomyositis have anti-Jo-1 antibodies, their presence is strongly
supportive of the diagnosis and is the most specific among the options
provided.
Question 3
A 72-year-old man with a history of hypertension and type 2 diabetes
mellitus presents with sudden-onset, painless vision loss in his right eye
that occurred approximately two hours ago. On examination, his right
pupil reacts sluggishly to light, and funduscopic examination reveals a
pale, edematous retina with a cherry-red spot at the fovea. Which of the
following is the most likely diagnosis?
, A. Central retinal vein occlusion
B. Retinal detachment
C. Central retinal artery occlusion
D. Acute angle-closure glaucoma
Correct ,,,,answer,,,: C. Central retinal artery occlusion
Rationale: This patient's presentation of sudden, painless monocular
vision loss with a pale retina and a cherry-red spot at the fovea is
pathognomonic for central retinal artery occlusion (CRAO). The cherry-
red spot occurs because the fovea receives its blood supply from the
choroidal circulation rather than the central retinal artery, so it remains
perfused and appears red against the pale, ischemic retina. CRAO is
typically caused by an embolus originating from the carotid artery or the
heart, and risk factors include hypertension, diabetes, and
hyperlipidemia. Central retinal vein occlusion (A) typically presents
with sudden vision loss but funduscopic findings include diffuse retinal
hemorrhages, dilated and tortuous veins, and optic disc edema—not a
cherry-red spot. Retinal detachment (B) usually presents with gradual
vision loss, floaters, and flashes of light, and the retina appears elevated
and wrinkled on examination. Acute angle-closure glaucoma (D)
presents with painful vision loss, conjunctival injection, corneal edema,
and a fixed, mid-dilated pupil—not the funduscopic findings described
here.
Question 4
A 28-year-old woman who is 32 weeks pregnant presents with a three-
day history of headache, blurred vision, and right upper quadrant
Bank – Newest 2026 Edition |
Comprehensive 176-Question Set with
Verified Answers & Detailed Rationales
Question 1
A 58-year-old man with a 40-pack-year smoking history presents to the
emergency department with acute-onset shortness of breath and sharp
right-sided chest pain that worsens with inspiration. His heart rate is 110
bpm, respiratory rate is 26/min, and oxygen saturation is 89% on room
air. On examination, breath sounds are diminished on the right side, and
percussion is hyperresonant. Which of the following is the most
appropriate next step in management?
A. Needle decompression of the right chest
B. Emergent endotracheal intubation
C. Administration of alteplase (tPA)
D. Placement of a right-sided chest tube
Correct ,,,,answer,,,: D. Placement of a right-sided chest tube
Rationale: This patient presents with the classic features of a
spontaneous pneumothorax: acute dyspnea, pleuritic chest pain,
tachypnea, tachycardia, hypoxia, and diminished breath sounds with
,hyperresonance on percussion. Given his significant smoking history, he
is at increased risk for spontaneous pneumothorax due to rupture of
subpleural blebs. The oxygen saturation of 89% indicates a large
pneumothorax causing significant physiologic compromise. While
needle decompression (A) is indicated for tension pneumothorax, this
patient does not exhibit the hallmark signs of tension physiology such as
tracheal deviation, jugular venous distention, or hypotension. Emergent
intubation (B) is not indicated as the primary management and could
actually worsen the pneumothorax if positive pressure ventilation is
initiated without first decompressing the chest. Alteplase (C) is used for
massive pulmonary embolism, not pneumothorax. The definitive
management for a large, symptomatic spontaneous pneumothorax is tube
thoracostomy (chest tube placement), which allows continuous
evacuation of air from the pleural space and re-expansion of the lung.
Question 2
A 45-year-old woman presents with a three-month history of progressive
weakness in her proximal upper and lower extremities. She reports
difficulty rising from a seated position and brushing her hair. On
physical examination, she has symmetric proximal muscle weakness and
a heliotrope rash on her eyelids. Laboratory studies reveal an elevated
creatine kinase level. Which of the following autoantibodies is most
specifically associated with this condition?
A. Anti-Jo-1 antibody
B. Anti-SSA/Ro antibody
C. Anti-Smith antibody
D. Anti-centromere antibody
,Correct ,,,,answer,,,: A. Anti-Jo-1 antibody
Rationale: This patient's presentation of proximal muscle weakness,
difficulty with activities of daily living, and the characteristic heliotrope
rash (purple discoloration of the eyelids) is classic for dermatomyositis.
Dermatomyositis is an idiopathic inflammatory myopathy characterized
by symmetric proximal muscle weakness and characteristic skin
findings. Elevated creatine kinase confirms muscle damage. Anti-Jo-1
antibody is an antisynthetase antibody that is highly specific for
dermatomyositis and polymyositis, particularly in patients who also have
interstitial lung disease, arthritis, or Raynaud phenomenon. Anti-
SSA/Ro (B) is associated with Sjögren syndrome and subacute
cutaneous lupus erythematosus. Anti-Smith (C) is highly specific for
systemic lupus erythematosus but is not associated with myositis. Anti-
centromere antibody (D) is associated with the limited cutaneous form
of systemic sclerosis (CREST syndrome). While not all patients with
dermatomyositis have anti-Jo-1 antibodies, their presence is strongly
supportive of the diagnosis and is the most specific among the options
provided.
Question 3
A 72-year-old man with a history of hypertension and type 2 diabetes
mellitus presents with sudden-onset, painless vision loss in his right eye
that occurred approximately two hours ago. On examination, his right
pupil reacts sluggishly to light, and funduscopic examination reveals a
pale, edematous retina with a cherry-red spot at the fovea. Which of the
following is the most likely diagnosis?
, A. Central retinal vein occlusion
B. Retinal detachment
C. Central retinal artery occlusion
D. Acute angle-closure glaucoma
Correct ,,,,answer,,,: C. Central retinal artery occlusion
Rationale: This patient's presentation of sudden, painless monocular
vision loss with a pale retina and a cherry-red spot at the fovea is
pathognomonic for central retinal artery occlusion (CRAO). The cherry-
red spot occurs because the fovea receives its blood supply from the
choroidal circulation rather than the central retinal artery, so it remains
perfused and appears red against the pale, ischemic retina. CRAO is
typically caused by an embolus originating from the carotid artery or the
heart, and risk factors include hypertension, diabetes, and
hyperlipidemia. Central retinal vein occlusion (A) typically presents
with sudden vision loss but funduscopic findings include diffuse retinal
hemorrhages, dilated and tortuous veins, and optic disc edema—not a
cherry-red spot. Retinal detachment (B) usually presents with gradual
vision loss, floaters, and flashes of light, and the retina appears elevated
and wrinkled on examination. Acute angle-closure glaucoma (D)
presents with painful vision loss, conjunctival injection, corneal edema,
and a fixed, mid-dilated pupil—not the funduscopic findings described
here.
Question 4
A 28-year-old woman who is 32 weeks pregnant presents with a three-
day history of headache, blurred vision, and right upper quadrant
