COMSAE 2026 Study Guide: 100% Verified
Questions And Well Graded Solutions With
Rationales Updated 2026 2027
Master the COMSAE 2026 Phase 1 with this definitive, high-yield study guide. This complete exam
preparation resource features 100% correct, verified answers and comprehensive rationales
mimicking official board styling. Perfect for active recall, self-study, and targeted revision, it
thoroughly covers essential clinical knowledge, diagnostic triads, pharmacology, and highly tested
viscerosomatic levels (T1–L2). Reinforce your understanding and gain maximum confidence to
excel.
High-Yield Viscerosomatic Levels (T1–L2) Breakdown
On the COMSAE and COMLEX exams, viscerosomatic reflexes are heavily tested.
Memorize this definitive structural breakdown:
• T1–T4: Head, neck, heart, and lungs (upper respiratory tract).
• T1–T5: Heart.
• T2–T7: Lungs and respiratory tree.
• T5–T9: Upper GI tract (Stomach, Liver, Gallbladder, Spleen, portion of Duodenum)
via the Greater Splanchnic Nerve / Celiac Ganglion.
• T10–T11: Middle GI tract (Portion of Duodenum to proximal 2/3 of Transverse Colon)
via the Lesser Splanchnic Nerve / Superior Mesenteric Ganglion.
• T10–T11: Kidneys, Upper Ureters, Gonads (Ovaries and Testes).
• T12–L2: Lower GI tract (Distal 1/3 of Transverse Colon to Rectum) via the
Least/Lumbar Splanchnic Nerves / Inferior Mesenteric Ganglion.
1|Page
,• T12–L2: Lower Ureters, Bladder, Uterus, Prostate, and Erectile Tissue.
1. A 64-year-old male with a history of severe major depressive disorder
presents to the emergency department after an intentional ingestion of an
unknown medication. Physical examination reveals an altered mental status,
dry skin, dilated pupils, and a palpable suprapubic mass. An
electrocardiogram (ECG) reveals a QRS duration of 124 ms. Which of the
following medications is most likely responsible for this patient's clinical
presentation?
A. Sertraline
B. Bupropion
C. Phenelzine
D. Imipramine
Rationale: Imipramine is a tricyclic antidepressant (TCA). The hallmark of
TCA toxicity follows the "Tri-Cs": Convulsions, Coma, and Cardiotoxicity
(characterized by QRS prolongation due to myocardial sodium channel
blockade). Additionally, TCAs possess strong anticholinergic properties,
leading to symptoms like altered mental status, mydriasis (dilated pupils), dry
skin, and urinary retention (palpable suprapubic mass).
2. A 23-year-old female presents with severe right upper quadrant abdominal
pain that radiates to her right scapula, accompanied by nausea and vomiting
after eating a fatty meal. Physical examination reveals tenderness to palpation
in the right upper quadrant with inspiratory arrest. If a viscerosomatic reflex is
present for this condition, at which of the following spinal levels would somatic
dysfunction most likely be palpated?
A. T1–T4
B. T5–T9
C. T10–T11
D. T12–L2
Rationale: The patient exhibits signs of acute cholecystitis (positive Murphy's
sign). The gallbladder and liver are upper gastrointestinal structures derived
from the foregut. Sympathetic innervation to foregut structures originates from
the T5–T9 spinal segments, synapsing in the celiac ganglion via the greater
splanchnic nerve. Somatic dysfunction associated with gallbladder pathology
will present as tissue texture changes or restriction at T5–T9 on the right.
3. A 19-year-old college student presents to the outpatient clinic complaining of
a 3-week history of productive cough, shortness of breath, and wheezing. She
notes a childhood history of recurrent respiratory infections and steatorrhea. A
sweat chloride test confirms the diagnosis. Chest X-ray is likely to reveal
which of the following long-term pulmonary complications?
A. Idiopathic pulmonary fibrosis
B. Centrilobular emphysema
C. Bronchiectasis
D. Sarcoidosis
Rationale: The patient's history of recurrent respiratory infections, steatorrhea,
2|Page
, and a positive sweat chloride test is diagnostic for Cystic Fibrosis (CF). The
defective CFTR channel leads to thick, viscous mucus production across
exocrine glands. In the lungs, this causes chronic airway obstruction,
recurrent infections, chronic bronchitis, and permanent abnormal dilation of
the bronchi, known as bronchiectasis.
4. A 68-year-old female presents to her primary care physician following a minor
fall in her kitchen that resulted in a distal radius fracture. A dual-energy X-ray
absorptiometry (DEXA) scan is ordered and reveals a T-score of -2.8. Which
of the following structural components of bone is primarily lost in this patient's
underlying condition?
A. Cortical bone mass
B. Trabecular bone mass
C. Osteoid matrix mineralization
D. Periosteal bone diameter
Rationale: A T-score of -2.8 confirms a diagnosis of osteoporosis (T-score ≤ -
2.5). Osteoporosis is characterized by a reduction in total bone mass where
bone resorption exceeds bone formation. This condition preferentially affects
trabecular (spongy or cancellous) bone mass, making areas rich in trabecular
bone—such as the vertebral bodies, femoral neck, and distal radius—highly
susceptible to fragility fractures.
5. A 28-year-old male is brought to the emergency department following a high-
speed motor vehicle collision. He is in severe respiratory distress, cyanotic,
and hypotensive. Physical examination reveals absent breath sounds on the
right side and hyperresonance to percussion. His trachea is visibly deviated
toward the left side. Which of the following is the most appropriate immediate
intervention?
A. Obtain an urgent chest X-ray
B. Endotracheal intubation
C. Needle decompression
D. Tube thoracostomy
Rationale: The clinical triad of absent breath sounds, hyperresonance to
percussion, hypotension, and contralateral tracheal deviation (away from the
side of the lesion) is diagnostic for a tension pneumothorax. This is a medical
emergency requiring immediate needle decompression in the second
intercostal space at the midclavicular line (or fifth intercostal space at the
anterior axillary line) before obtaining imaging, followed by a definitive tube
thoracostomy.
6. A 34-year-old male returns from a volunteer trip to a rural tropical region and
presents with a 2-week history of bloody diarrhea, lower abdominal cramping,
and low-grade fever. Microscopic evaluation of a stool sample reveals
trophozoites containing engulfed erythrocytes. Which of the following
organisms is the causative agent?
A. Giardia lamblia
B. Cryptosporidium parvum
C. Entamoeba histolytica
D. Campylobacter jejuni
Rationale: Entamoeba histolytica is a protozoan parasite that causes amebic
dysentery. A classic, high-yield diagnostic feature seen on stool microscopy is
erythrophagocytosis—trophozoites containing ingested red blood cells inside
their cytoplasm. This distinguishes it from non-pathogenic amoebae.
3|Page
, 7. A 24-year-old medical student seeks relief from seasonal allergic rhinitis
before a major exam. He requests an antihistamine that will not impair his
cognitive performance or cause drowsiness during his test. Which of the
following medications matches his criteria, and what is its mechanism?
A. Diphenhydramine; crosses the blood-brain barrier
B. Loratadine; does not cross the blood-brain barrier
C. Ranitidine; blocks histamine H2 receptors
D. Hydroxyzine; blocks central H1 receptors
Rationale: Loratadine is a second-generation H1 receptor antagonist. Unlike
first-generation antihistamines (e.g., diphenhydramine, hydroxyzine), second-
generation agents are highly polar and do not readily cross the blood-brain
barrier. Consequently, they cause significantly less sedation and minimal
central nervous system side effects, making them ideal for daytime use.
8. A 45-year-old male with a history of gastroesophageal reflux disease (GERD)
is managing his symptoms with ranitidine. Which of the following describes
the mechanism of action of this medication?
A. Irreversible inhibition of the H+/K+ ATPase pump
B. Competitive antagonism of H2 receptors
C. Neutralization of gastric acid via chemical buffering
D. Direct stimulation of upper GI motility
Rationale: Ranitidine is a histamine H2 receptor antagonist. It competitively
blocks H2 receptors on gastric parietal cells, thereby reducing basal and
nocturnal gastric acid secretion. In contrast, proton pump inhibitors (like
omeprazole) irreversibly inhibit the H+/K+ ATPase pump.
9. A patient is diagnosed with an inflammatory condition affecting the
descending colon and rectum. An osteopathic physician performing a
structural examination notes tissue texture abnormalities in the lumbar spine.
At which of the following spinal segments would a viscerosomatic reflex for
these lower gastrointestinal structures be expected?
A. T5–T9
B. T10–T11
C. T12–L2
D. L3–L5
Rationale: The descending colon, sigmoid colon, and rectum are hindgut
structures. The sympathetic innervation to the hindgut originates from the
T12–L2 spinal levels, with preganglionic fibers traveling through lumbar
splanchnic nerves to synapse in the inferior mesenteric ganglion. Somatic
dysfunction corresponding to hindgut disease manifests at T12–L2.
10. A 72-year-old male patient with a history of closed-angle glaucoma is
prescribed imipramine for neuropathic pain. Two days after starting the
medication, he presents with severe right eye pain, blurred vision, and a fixed,
mid-dilated pupil. This acute exacerbation is primarily caused by which
property of imipramine?
A. Alpha-1 adrenergic blockade
B. Anticholinergic activity
C. Serotonin reuptake inhibition
D. Sodium channel blockade
Rationale: Imipramine possesses strong muscarinic (anticholinergic)
antagonist properties. Blocking muscarinic receptors prevents pupillary
constrictor muscle activation, leading to mydriasis. In patients with pre-
4|Page
Questions And Well Graded Solutions With
Rationales Updated 2026 2027
Master the COMSAE 2026 Phase 1 with this definitive, high-yield study guide. This complete exam
preparation resource features 100% correct, verified answers and comprehensive rationales
mimicking official board styling. Perfect for active recall, self-study, and targeted revision, it
thoroughly covers essential clinical knowledge, diagnostic triads, pharmacology, and highly tested
viscerosomatic levels (T1–L2). Reinforce your understanding and gain maximum confidence to
excel.
High-Yield Viscerosomatic Levels (T1–L2) Breakdown
On the COMSAE and COMLEX exams, viscerosomatic reflexes are heavily tested.
Memorize this definitive structural breakdown:
• T1–T4: Head, neck, heart, and lungs (upper respiratory tract).
• T1–T5: Heart.
• T2–T7: Lungs and respiratory tree.
• T5–T9: Upper GI tract (Stomach, Liver, Gallbladder, Spleen, portion of Duodenum)
via the Greater Splanchnic Nerve / Celiac Ganglion.
• T10–T11: Middle GI tract (Portion of Duodenum to proximal 2/3 of Transverse Colon)
via the Lesser Splanchnic Nerve / Superior Mesenteric Ganglion.
• T10–T11: Kidneys, Upper Ureters, Gonads (Ovaries and Testes).
• T12–L2: Lower GI tract (Distal 1/3 of Transverse Colon to Rectum) via the
Least/Lumbar Splanchnic Nerves / Inferior Mesenteric Ganglion.
1|Page
,• T12–L2: Lower Ureters, Bladder, Uterus, Prostate, and Erectile Tissue.
1. A 64-year-old male with a history of severe major depressive disorder
presents to the emergency department after an intentional ingestion of an
unknown medication. Physical examination reveals an altered mental status,
dry skin, dilated pupils, and a palpable suprapubic mass. An
electrocardiogram (ECG) reveals a QRS duration of 124 ms. Which of the
following medications is most likely responsible for this patient's clinical
presentation?
A. Sertraline
B. Bupropion
C. Phenelzine
D. Imipramine
Rationale: Imipramine is a tricyclic antidepressant (TCA). The hallmark of
TCA toxicity follows the "Tri-Cs": Convulsions, Coma, and Cardiotoxicity
(characterized by QRS prolongation due to myocardial sodium channel
blockade). Additionally, TCAs possess strong anticholinergic properties,
leading to symptoms like altered mental status, mydriasis (dilated pupils), dry
skin, and urinary retention (palpable suprapubic mass).
2. A 23-year-old female presents with severe right upper quadrant abdominal
pain that radiates to her right scapula, accompanied by nausea and vomiting
after eating a fatty meal. Physical examination reveals tenderness to palpation
in the right upper quadrant with inspiratory arrest. If a viscerosomatic reflex is
present for this condition, at which of the following spinal levels would somatic
dysfunction most likely be palpated?
A. T1–T4
B. T5–T9
C. T10–T11
D. T12–L2
Rationale: The patient exhibits signs of acute cholecystitis (positive Murphy's
sign). The gallbladder and liver are upper gastrointestinal structures derived
from the foregut. Sympathetic innervation to foregut structures originates from
the T5–T9 spinal segments, synapsing in the celiac ganglion via the greater
splanchnic nerve. Somatic dysfunction associated with gallbladder pathology
will present as tissue texture changes or restriction at T5–T9 on the right.
3. A 19-year-old college student presents to the outpatient clinic complaining of
a 3-week history of productive cough, shortness of breath, and wheezing. She
notes a childhood history of recurrent respiratory infections and steatorrhea. A
sweat chloride test confirms the diagnosis. Chest X-ray is likely to reveal
which of the following long-term pulmonary complications?
A. Idiopathic pulmonary fibrosis
B. Centrilobular emphysema
C. Bronchiectasis
D. Sarcoidosis
Rationale: The patient's history of recurrent respiratory infections, steatorrhea,
2|Page
, and a positive sweat chloride test is diagnostic for Cystic Fibrosis (CF). The
defective CFTR channel leads to thick, viscous mucus production across
exocrine glands. In the lungs, this causes chronic airway obstruction,
recurrent infections, chronic bronchitis, and permanent abnormal dilation of
the bronchi, known as bronchiectasis.
4. A 68-year-old female presents to her primary care physician following a minor
fall in her kitchen that resulted in a distal radius fracture. A dual-energy X-ray
absorptiometry (DEXA) scan is ordered and reveals a T-score of -2.8. Which
of the following structural components of bone is primarily lost in this patient's
underlying condition?
A. Cortical bone mass
B. Trabecular bone mass
C. Osteoid matrix mineralization
D. Periosteal bone diameter
Rationale: A T-score of -2.8 confirms a diagnosis of osteoporosis (T-score ≤ -
2.5). Osteoporosis is characterized by a reduction in total bone mass where
bone resorption exceeds bone formation. This condition preferentially affects
trabecular (spongy or cancellous) bone mass, making areas rich in trabecular
bone—such as the vertebral bodies, femoral neck, and distal radius—highly
susceptible to fragility fractures.
5. A 28-year-old male is brought to the emergency department following a high-
speed motor vehicle collision. He is in severe respiratory distress, cyanotic,
and hypotensive. Physical examination reveals absent breath sounds on the
right side and hyperresonance to percussion. His trachea is visibly deviated
toward the left side. Which of the following is the most appropriate immediate
intervention?
A. Obtain an urgent chest X-ray
B. Endotracheal intubation
C. Needle decompression
D. Tube thoracostomy
Rationale: The clinical triad of absent breath sounds, hyperresonance to
percussion, hypotension, and contralateral tracheal deviation (away from the
side of the lesion) is diagnostic for a tension pneumothorax. This is a medical
emergency requiring immediate needle decompression in the second
intercostal space at the midclavicular line (or fifth intercostal space at the
anterior axillary line) before obtaining imaging, followed by a definitive tube
thoracostomy.
6. A 34-year-old male returns from a volunteer trip to a rural tropical region and
presents with a 2-week history of bloody diarrhea, lower abdominal cramping,
and low-grade fever. Microscopic evaluation of a stool sample reveals
trophozoites containing engulfed erythrocytes. Which of the following
organisms is the causative agent?
A. Giardia lamblia
B. Cryptosporidium parvum
C. Entamoeba histolytica
D. Campylobacter jejuni
Rationale: Entamoeba histolytica is a protozoan parasite that causes amebic
dysentery. A classic, high-yield diagnostic feature seen on stool microscopy is
erythrophagocytosis—trophozoites containing ingested red blood cells inside
their cytoplasm. This distinguishes it from non-pathogenic amoebae.
3|Page
, 7. A 24-year-old medical student seeks relief from seasonal allergic rhinitis
before a major exam. He requests an antihistamine that will not impair his
cognitive performance or cause drowsiness during his test. Which of the
following medications matches his criteria, and what is its mechanism?
A. Diphenhydramine; crosses the blood-brain barrier
B. Loratadine; does not cross the blood-brain barrier
C. Ranitidine; blocks histamine H2 receptors
D. Hydroxyzine; blocks central H1 receptors
Rationale: Loratadine is a second-generation H1 receptor antagonist. Unlike
first-generation antihistamines (e.g., diphenhydramine, hydroxyzine), second-
generation agents are highly polar and do not readily cross the blood-brain
barrier. Consequently, they cause significantly less sedation and minimal
central nervous system side effects, making them ideal for daytime use.
8. A 45-year-old male with a history of gastroesophageal reflux disease (GERD)
is managing his symptoms with ranitidine. Which of the following describes
the mechanism of action of this medication?
A. Irreversible inhibition of the H+/K+ ATPase pump
B. Competitive antagonism of H2 receptors
C. Neutralization of gastric acid via chemical buffering
D. Direct stimulation of upper GI motility
Rationale: Ranitidine is a histamine H2 receptor antagonist. It competitively
blocks H2 receptors on gastric parietal cells, thereby reducing basal and
nocturnal gastric acid secretion. In contrast, proton pump inhibitors (like
omeprazole) irreversibly inhibit the H+/K+ ATPase pump.
9. A patient is diagnosed with an inflammatory condition affecting the
descending colon and rectum. An osteopathic physician performing a
structural examination notes tissue texture abnormalities in the lumbar spine.
At which of the following spinal segments would a viscerosomatic reflex for
these lower gastrointestinal structures be expected?
A. T5–T9
B. T10–T11
C. T12–L2
D. L3–L5
Rationale: The descending colon, sigmoid colon, and rectum are hindgut
structures. The sympathetic innervation to the hindgut originates from the
T12–L2 spinal levels, with preganglionic fibers traveling through lumbar
splanchnic nerves to synapse in the inferior mesenteric ganglion. Somatic
dysfunction corresponding to hindgut disease manifests at T12–L2.
10. A 72-year-old male patient with a history of closed-angle glaucoma is
prescribed imipramine for neuropathic pain. Two days after starting the
medication, he presents with severe right eye pain, blurred vision, and a fixed,
mid-dilated pupil. This acute exacerbation is primarily caused by which
property of imipramine?
A. Alpha-1 adrenergic blockade
B. Anticholinergic activity
C. Serotonin reuptake inhibition
D. Sodium channel blockade
Rationale: Imipramine possesses strong muscarinic (anticholinergic)
antagonist properties. Blocking muscarinic receptors prevents pupillary
constrictor muscle activation, leading to mydriasis. In patients with pre-
4|Page
