COMSAE PHASE 1 FORM 114 EXAM with Questions
and Answers/Plus a Rationale Updated 2026 A+/Instant
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EXAM COVERAGE
1. Cardiovascular System and Hemodynamics
2. Respiratory Physiology and Pulmonary Pathology
3. Renal Fluid, Electrolytes, and Acid-Base Balance
4. Gastrointestinal Tract and Hepatobiliary Systems
5. Central and Peripheral Nervous Systems
6. Endocrine, Metabolic, and Reproductive Disorders
7. Musculoskeletal, Dermatologic, and Connective Tissue
8. Immune System, Infectious Disease, and Pharmacology
51. A 54-year-old male with a history of long-standing hypertension and type 2 diabetes presents to
the emergency department with sudden-onset, tearing chest pain radiating to his back between
the shoulder blades. His blood pressure is 190/110 mmHg in the right arm and 140/85 mmHg in
the left arm. A widened mediastinum is noted on chest radiography. Which of the following is
the most appropriate initial medical management prior to definitive surgical intervention?
A. Administration of sublingual nitroglycerin to reduce preload and coronary filling pressure.
B. Immediate intravenous fluid boluses to maintain systemic vascular resistance and end-organ
perfusion.
C. Intravenous labetalol or esmolol infusion to control heart rate and blood pressure shear stress.
D. High-dose oral hydralazine monotherapy for rapid vasodilation.
, CORRECT ANSWER : C
Rationale: In acute aortic dissection, the primary goal of medical management is to aggressively
reduce both blood pressure and the rate of left ventricular contraction (dP/dt) to minimize shear
stress on the aortic wall. Intravenous beta-blockers such as labetalol or esmolol are the agents
of choice. Nitroglycerin and hydralazine can cause reflex tachycardia, worsening aortic wall
stress, while fluid boluses would dangerously elevate blood pressure.
52. A 32-year-old female is evaluated for recurrent fatigue, weight gain, constipation, and cold
intolerance over the past six months. Laboratory evaluation reveals a significantly elevated
thyroid-stimulating hormone (TSH) level and a decreased free thyroxine (T4) level. Anti-thyroid
peroxidase (TPO) antibodies are strongly positive. Histological examination of this patient's
thyroid gland would most characteristically demonstrate which of the following findings?
A. Granulomatous inflammation with multinucleated giant cells
B. Extensive dense fibrosis extending beyond the thyroid capsule into surrounding neck
structures
C. Extensive mononuclear infiltration with lymphocytes, plasma cells, and Hurthle cells
D. Follicular hyperplasia with scalloped colloid and papillary infoldings
CORRECT ANSWER : C
Rationale: Hashimoto thyroiditis is the most common cause of hypothyroidism in iodine-
sufficient regions and is characterized by high titers of anti-TPO antibodies. Histologically, it
presents with a dense mononuclear inflammatory infiltrate comprising lymphocytes, plasma
cells, germinal centers, and characteristic eosinophilic metaplastic cells known as Hurthle cells.
Granulomatous inflammation is seen in subacute thyroiditis, dense fibrosis in Riedel thyroiditis,
and follicular hyperplasia with scalloped colloid in Graves disease.
53. A 67-year-old chronic smoker presents with a 3-month history of progressive shortness of breath,
a chronic cough productive of copious amounts of mucoid sputum, and peripheral edema.
Physical examination reveals cyanosis, use of accessory respiratory muscles, coarse crackles, and
prominent jugular venous distension. Arterial blood gas analysis reveals hypoxemia and
hypercapnia. This clinical presentation is most characteristic of which underlying
pathophysiology?
A. Loss of elastic recoil and destruction of alveolar walls resulting in hyperinflated air spaces
B. Chronic airway inflammation, hypertrophy of bronchial mucous glands, and airway
remodeling
C. Granulomatous pulmonary infiltration with interstitial fibrosis and impaired gas diffusion
, D. Acute pulmonary thromboembolism causing ventilation-perfusion mismatch
CORRECT ANSWER : B
Rationale: This patient exhibits the classic clinical profile of chronic bronchitis, colloquially
known as a "blue bloater," characterized by chronic productive cough, cyanosis, airway
inflammation, and hypertrophy of bronchial mucous glands (quantified by an increased Reid
index). Emphysema features destruction of alveolar walls with minimal sputum production.
Interstitial fibrosis presents with a restrictive pattern, and pulmonary embolism causes acute
hemodynamic instability.
54. A 45-year-old male is brought to the emergency department after being found unresponsive.
Arterial blood gas analysis reveals a pH of 7.21, a partial pressure of carbon dioxide (PaCO2) of
60 mmHg, and a serum bicarbonate (HCO3-) level of 24 mEq/L. Serum electrolytes show a
sodium of 138 mEq/L, chloride of 102 mEq/L, and potassium of 4.2 mEq/L. Which of the
following is the most likely underlying mechanism for this acid-base disturbance?
A. Primary metabolic acidosis with an elevated anion gap secondary to lactic acid accumulation
B. Acute alveolar hypoventilation resulting in uncompensated respiratory acidosis
C. Chronic renal failure causing impaired hydrogen ion excretion and bicarbonate resorption
failure
D. Primary metabolic alkalosis secondary to severe protracted vomiting and volume depletion
CORRECT ANSWER : B
Rationale: The arterial blood gas demonstrates acidemia (pH 7.21) driven by an elevated
PaCO2 (60 mmHg), which indicates acute respiratory acidosis due to alveolar hypoventilation.
The serum bicarbonate is normal, indicating an acute phase without renal compensation yet. The
anion gap is normal, ruling out high anion gap metabolic acidosis.
55. A 28-year-old female presents with acute right lower quadrant abdominal pain, nausea, and low-
grade fever. Physical examination reveals tenderness at McBurney's point and a positive psoas
sign. The patient undergoes an uncomplicated laparoscopic appendectomy. Histopathological
examination of the resected appendix is most likely to demonstrate which of the following
cellular infiltrates?
A. Eosinophils and granulomatous nodules containing caseating necrosis
B. Neutrophils infiltrating the muscularis propria wall layers
C. Lymphocytes and plasma cells restricted solely to the mucosal lamina propria
D. Non-caseating granulomas with multinucleated giant cells distributed transmurally
and Answers/Plus a Rationale Updated 2026 A+/Instant
Download PDF
EXAM COVERAGE
1. Cardiovascular System and Hemodynamics
2. Respiratory Physiology and Pulmonary Pathology
3. Renal Fluid, Electrolytes, and Acid-Base Balance
4. Gastrointestinal Tract and Hepatobiliary Systems
5. Central and Peripheral Nervous Systems
6. Endocrine, Metabolic, and Reproductive Disorders
7. Musculoskeletal, Dermatologic, and Connective Tissue
8. Immune System, Infectious Disease, and Pharmacology
51. A 54-year-old male with a history of long-standing hypertension and type 2 diabetes presents to
the emergency department with sudden-onset, tearing chest pain radiating to his back between
the shoulder blades. His blood pressure is 190/110 mmHg in the right arm and 140/85 mmHg in
the left arm. A widened mediastinum is noted on chest radiography. Which of the following is
the most appropriate initial medical management prior to definitive surgical intervention?
A. Administration of sublingual nitroglycerin to reduce preload and coronary filling pressure.
B. Immediate intravenous fluid boluses to maintain systemic vascular resistance and end-organ
perfusion.
C. Intravenous labetalol or esmolol infusion to control heart rate and blood pressure shear stress.
D. High-dose oral hydralazine monotherapy for rapid vasodilation.
, CORRECT ANSWER : C
Rationale: In acute aortic dissection, the primary goal of medical management is to aggressively
reduce both blood pressure and the rate of left ventricular contraction (dP/dt) to minimize shear
stress on the aortic wall. Intravenous beta-blockers such as labetalol or esmolol are the agents
of choice. Nitroglycerin and hydralazine can cause reflex tachycardia, worsening aortic wall
stress, while fluid boluses would dangerously elevate blood pressure.
52. A 32-year-old female is evaluated for recurrent fatigue, weight gain, constipation, and cold
intolerance over the past six months. Laboratory evaluation reveals a significantly elevated
thyroid-stimulating hormone (TSH) level and a decreased free thyroxine (T4) level. Anti-thyroid
peroxidase (TPO) antibodies are strongly positive. Histological examination of this patient's
thyroid gland would most characteristically demonstrate which of the following findings?
A. Granulomatous inflammation with multinucleated giant cells
B. Extensive dense fibrosis extending beyond the thyroid capsule into surrounding neck
structures
C. Extensive mononuclear infiltration with lymphocytes, plasma cells, and Hurthle cells
D. Follicular hyperplasia with scalloped colloid and papillary infoldings
CORRECT ANSWER : C
Rationale: Hashimoto thyroiditis is the most common cause of hypothyroidism in iodine-
sufficient regions and is characterized by high titers of anti-TPO antibodies. Histologically, it
presents with a dense mononuclear inflammatory infiltrate comprising lymphocytes, plasma
cells, germinal centers, and characteristic eosinophilic metaplastic cells known as Hurthle cells.
Granulomatous inflammation is seen in subacute thyroiditis, dense fibrosis in Riedel thyroiditis,
and follicular hyperplasia with scalloped colloid in Graves disease.
53. A 67-year-old chronic smoker presents with a 3-month history of progressive shortness of breath,
a chronic cough productive of copious amounts of mucoid sputum, and peripheral edema.
Physical examination reveals cyanosis, use of accessory respiratory muscles, coarse crackles, and
prominent jugular venous distension. Arterial blood gas analysis reveals hypoxemia and
hypercapnia. This clinical presentation is most characteristic of which underlying
pathophysiology?
A. Loss of elastic recoil and destruction of alveolar walls resulting in hyperinflated air spaces
B. Chronic airway inflammation, hypertrophy of bronchial mucous glands, and airway
remodeling
C. Granulomatous pulmonary infiltration with interstitial fibrosis and impaired gas diffusion
, D. Acute pulmonary thromboembolism causing ventilation-perfusion mismatch
CORRECT ANSWER : B
Rationale: This patient exhibits the classic clinical profile of chronic bronchitis, colloquially
known as a "blue bloater," characterized by chronic productive cough, cyanosis, airway
inflammation, and hypertrophy of bronchial mucous glands (quantified by an increased Reid
index). Emphysema features destruction of alveolar walls with minimal sputum production.
Interstitial fibrosis presents with a restrictive pattern, and pulmonary embolism causes acute
hemodynamic instability.
54. A 45-year-old male is brought to the emergency department after being found unresponsive.
Arterial blood gas analysis reveals a pH of 7.21, a partial pressure of carbon dioxide (PaCO2) of
60 mmHg, and a serum bicarbonate (HCO3-) level of 24 mEq/L. Serum electrolytes show a
sodium of 138 mEq/L, chloride of 102 mEq/L, and potassium of 4.2 mEq/L. Which of the
following is the most likely underlying mechanism for this acid-base disturbance?
A. Primary metabolic acidosis with an elevated anion gap secondary to lactic acid accumulation
B. Acute alveolar hypoventilation resulting in uncompensated respiratory acidosis
C. Chronic renal failure causing impaired hydrogen ion excretion and bicarbonate resorption
failure
D. Primary metabolic alkalosis secondary to severe protracted vomiting and volume depletion
CORRECT ANSWER : B
Rationale: The arterial blood gas demonstrates acidemia (pH 7.21) driven by an elevated
PaCO2 (60 mmHg), which indicates acute respiratory acidosis due to alveolar hypoventilation.
The serum bicarbonate is normal, indicating an acute phase without renal compensation yet. The
anion gap is normal, ruling out high anion gap metabolic acidosis.
55. A 28-year-old female presents with acute right lower quadrant abdominal pain, nausea, and low-
grade fever. Physical examination reveals tenderness at McBurney's point and a positive psoas
sign. The patient undergoes an uncomplicated laparoscopic appendectomy. Histopathological
examination of the resected appendix is most likely to demonstrate which of the following
cellular infiltrates?
A. Eosinophils and granulomatous nodules containing caseating necrosis
B. Neutrophils infiltrating the muscularis propria wall layers
C. Lymphocytes and plasma cells restricted solely to the mucosal lamina propria
D. Non-caseating granulomas with multinucleated giant cells distributed transmurally
