COMSAE Phase 2 BSA – Comprehensive Exam
Study Guide with Questions, Answers and
Rationales 2026/2027 Update
Section 1: Cardiovascular System
Question 1
A 68-year-old man with a history of hypertension, type 2 diabetes mellitus, and dyslipidemia is
evaluated in the emergency department for severe, crushing substernal chest pain that began 45
minutes ago while resting. The pain radiates to his left jaw and is associated with diaphoresis and
nausea. An electrocardiogram (ECG) demonstrates 3 mm of ST-segment elevation in leads V1
through V4.
Which of the following coronary arteries is most likely occluded?
A. Left anterior descending artery
B. Right coronary artery
C. Left circumflex artery
D. Obtuse marginal branch
Correct Answer: A. Left anterior descending artery
Rationale:
The left anterior descending (LAD) artery supplies blood to the anterior wall of the left ventricle
and the anterior portion of the interventricular septum. Acute occlusion of the LAD
characteristically produces ST-segment elevations in the anterior precordial leads (V1–V4). The
right coronary artery typically supplies inferior leads (II, III, aVF), while the circumflex artery
supplies lateral leads (I, aVL, V5–V6).
Question 2
A 55-year-old woman is evaluated for progressive shortness of breath with exertion, orthopnea,
and paroxysmal nocturnal dyspnea over the past six months. She has a 10-year history of poorly
controlled essential hypertension. Physical examination reveals a laterally displaced apical
impulse and an S4 heart sound. Echocardiography demonstrates a left ventricular ejection
fraction of 55%, concentric left ventricular hypertrophy, and normal end-diastolic dimensions,
but impaired early diastolic filling.
,What is the primary physiological mechanism responsible for her symptoms?
A. Decreased ventricular compliance and impaired diastolic relaxation
B. Systolic pump failure with depressed myocardial contractility
C. Severe valvular incompetence leading to massive volume overload
D. High-output cardiac state secondary to systemic vasodilation
Correct Answer: A. Decreased ventricular compliance and impaired diastolic relaxation
Rationale:
Heart failure with preserved ejection fraction (HFpEF) is characterized by normal left ventricular
systolic function alongside a stiffened, hypertrophied ventricular myocardium. This impaired
relaxation and reduced ventricular compliance lead to elevated left ventricular end-diastolic
filling pressures, which transmit backward into the pulmonary circulation to cause pulmonary
congestion and dyspnea.
Section 2: Pulmonary System
Question 3
A 62-year-old man with a 40-pack-year smoking history presents with worsening dyspnea on
exertion, a chronic productive cough, and a barrel-shaped chest. Spirometry demonstrates a
forced expiratory volume in 1 second to forced vital capacity (FEV1/FVC) ratio of 0.60 that
shows minimal reversibility after bronchodilator administration.
What is the primary physiological mechanism responsible for airflow limitation in this
condition?
A. Loss of elastic recoil and destruction of alveolar walls
B. Immediate IgE-mediated bronchoconstriction of smooth muscle
C. Fixed granulomatous obstruction of central airways
D. Pulmonary capillary bed obliteration without parenchymal damage
Correct Answer: A. Loss of elastic recoil and destruction of alveolar walls
Rationale:
Chronic obstructive pulmonary disease (COPD), specifically the emphysematous phenotype,
involves permanent destruction of alveolar walls and loss of radial traction on small airways.
,This loss of elastic recoil causes premature expiratory airway collapse, air trapping, and
irreversible airflow limitation, yielding a reduced FEV1/FVC ratio.
Question 4
A 55-year-old man who worked as a shipyard insulation installer for 30 years presents with
progressive dyspnea and dry cough. Chest radiograph demonstrates lower lobe interstitial
reticular opacities and calcified pleural plaques.
Exposure to which substance significantly increases this patient's risk of developing both
bronchogenic carcinoma and malignant mesothelioma?
A. Asbestos fibers
B. Silica dust
C. Beryllium particles
D. Coal mine dust
Correct Answer: A. Asbestos fibers
Rationale:
Asbestos exposure causes pulmonary interstitial fibrosis (asbestosis) and pleural plaques. It is
uniquely synergistic with cigarette smoking in significantly increasing the risk of bronchogenic
carcinoma, and it serves as the primary independent risk factor for malignant mesothelioma of
the pleura and peritoneum.
Section 3: Gastrointestinal System
Question 5
A 45-year-old man presents with recurrent burning epigastric pain that worsens when his
stomach is empty and improves shortly after eating meals or taking antacids.
What is the most common underlying etiology of this condition?
A. Helicobacter pylori infection
B. Chronic non-steroidal anti-inflammatory drug overuse
C. Zollinger-Ellison gastrin-secreting tumor
D. Autoimmune destruction of parietal cells
, Correct Answer: A. Helicobacter pylori infection
Rationale:
Duodenal peptic ulcers are most frequently caused by Helicobacter pylori colonization of the
gastric antrum. The bacteria produce urease and local inflammatory changes that reduce mucosal
defenses and increase gastric acid secretion, giving rise to classic postprandial pain relief when
food buffers the acid.
Question 6
A 50-year-old man with chronic hepatitis C cirrhosis presents with worsening abdominal
distension and pedal edema. Paracentesis reveals straw-colored peritoneal fluid. The serum-
ascites albumin gradient (SAAG) is calculated at 1.5 g/dL.
What does a SAAG value of 1.5 g/dL (greater than or equal to 1.1 g/dL) indicate?
A. Portal hypertension (transudative ascites)
B. Peritoneal carcinomatosis (exudative ascites)
C. Tuberculous peritonitis
D. Nephrotic syndrome-induced ascites
Correct Answer: A. Portal hypertension (transudative ascites)
Rationale:
The serum-ascites albumin gradient (SAAG) is calculated by subtracting the ascites albumin
concentration from the serum albumin concentration. A SAAG value 1.1 g/dL indicates that
portal hypertension is the underlying driver of ascites formation, such as cirrhosis, alcoholic
hepatitis, or right-sided heart failure.
Section 4: Renal & Genitourinary System
Question 7
A patient with chronic kidney disease presents to the emergency department complaining of
generalized muscle weakness and palpitations. An electrocardiogram reveals tall, peaked T
waves, a prolonged PR interval, and widened QRS complexes.
What isalu the underlying electrolyte disturbance?
A. Hypocalcemia
Study Guide with Questions, Answers and
Rationales 2026/2027 Update
Section 1: Cardiovascular System
Question 1
A 68-year-old man with a history of hypertension, type 2 diabetes mellitus, and dyslipidemia is
evaluated in the emergency department for severe, crushing substernal chest pain that began 45
minutes ago while resting. The pain radiates to his left jaw and is associated with diaphoresis and
nausea. An electrocardiogram (ECG) demonstrates 3 mm of ST-segment elevation in leads V1
through V4.
Which of the following coronary arteries is most likely occluded?
A. Left anterior descending artery
B. Right coronary artery
C. Left circumflex artery
D. Obtuse marginal branch
Correct Answer: A. Left anterior descending artery
Rationale:
The left anterior descending (LAD) artery supplies blood to the anterior wall of the left ventricle
and the anterior portion of the interventricular septum. Acute occlusion of the LAD
characteristically produces ST-segment elevations in the anterior precordial leads (V1–V4). The
right coronary artery typically supplies inferior leads (II, III, aVF), while the circumflex artery
supplies lateral leads (I, aVL, V5–V6).
Question 2
A 55-year-old woman is evaluated for progressive shortness of breath with exertion, orthopnea,
and paroxysmal nocturnal dyspnea over the past six months. She has a 10-year history of poorly
controlled essential hypertension. Physical examination reveals a laterally displaced apical
impulse and an S4 heart sound. Echocardiography demonstrates a left ventricular ejection
fraction of 55%, concentric left ventricular hypertrophy, and normal end-diastolic dimensions,
but impaired early diastolic filling.
,What is the primary physiological mechanism responsible for her symptoms?
A. Decreased ventricular compliance and impaired diastolic relaxation
B. Systolic pump failure with depressed myocardial contractility
C. Severe valvular incompetence leading to massive volume overload
D. High-output cardiac state secondary to systemic vasodilation
Correct Answer: A. Decreased ventricular compliance and impaired diastolic relaxation
Rationale:
Heart failure with preserved ejection fraction (HFpEF) is characterized by normal left ventricular
systolic function alongside a stiffened, hypertrophied ventricular myocardium. This impaired
relaxation and reduced ventricular compliance lead to elevated left ventricular end-diastolic
filling pressures, which transmit backward into the pulmonary circulation to cause pulmonary
congestion and dyspnea.
Section 2: Pulmonary System
Question 3
A 62-year-old man with a 40-pack-year smoking history presents with worsening dyspnea on
exertion, a chronic productive cough, and a barrel-shaped chest. Spirometry demonstrates a
forced expiratory volume in 1 second to forced vital capacity (FEV1/FVC) ratio of 0.60 that
shows minimal reversibility after bronchodilator administration.
What is the primary physiological mechanism responsible for airflow limitation in this
condition?
A. Loss of elastic recoil and destruction of alveolar walls
B. Immediate IgE-mediated bronchoconstriction of smooth muscle
C. Fixed granulomatous obstruction of central airways
D. Pulmonary capillary bed obliteration without parenchymal damage
Correct Answer: A. Loss of elastic recoil and destruction of alveolar walls
Rationale:
Chronic obstructive pulmonary disease (COPD), specifically the emphysematous phenotype,
involves permanent destruction of alveolar walls and loss of radial traction on small airways.
,This loss of elastic recoil causes premature expiratory airway collapse, air trapping, and
irreversible airflow limitation, yielding a reduced FEV1/FVC ratio.
Question 4
A 55-year-old man who worked as a shipyard insulation installer for 30 years presents with
progressive dyspnea and dry cough. Chest radiograph demonstrates lower lobe interstitial
reticular opacities and calcified pleural plaques.
Exposure to which substance significantly increases this patient's risk of developing both
bronchogenic carcinoma and malignant mesothelioma?
A. Asbestos fibers
B. Silica dust
C. Beryllium particles
D. Coal mine dust
Correct Answer: A. Asbestos fibers
Rationale:
Asbestos exposure causes pulmonary interstitial fibrosis (asbestosis) and pleural plaques. It is
uniquely synergistic with cigarette smoking in significantly increasing the risk of bronchogenic
carcinoma, and it serves as the primary independent risk factor for malignant mesothelioma of
the pleura and peritoneum.
Section 3: Gastrointestinal System
Question 5
A 45-year-old man presents with recurrent burning epigastric pain that worsens when his
stomach is empty and improves shortly after eating meals or taking antacids.
What is the most common underlying etiology of this condition?
A. Helicobacter pylori infection
B. Chronic non-steroidal anti-inflammatory drug overuse
C. Zollinger-Ellison gastrin-secreting tumor
D. Autoimmune destruction of parietal cells
, Correct Answer: A. Helicobacter pylori infection
Rationale:
Duodenal peptic ulcers are most frequently caused by Helicobacter pylori colonization of the
gastric antrum. The bacteria produce urease and local inflammatory changes that reduce mucosal
defenses and increase gastric acid secretion, giving rise to classic postprandial pain relief when
food buffers the acid.
Question 6
A 50-year-old man with chronic hepatitis C cirrhosis presents with worsening abdominal
distension and pedal edema. Paracentesis reveals straw-colored peritoneal fluid. The serum-
ascites albumin gradient (SAAG) is calculated at 1.5 g/dL.
What does a SAAG value of 1.5 g/dL (greater than or equal to 1.1 g/dL) indicate?
A. Portal hypertension (transudative ascites)
B. Peritoneal carcinomatosis (exudative ascites)
C. Tuberculous peritonitis
D. Nephrotic syndrome-induced ascites
Correct Answer: A. Portal hypertension (transudative ascites)
Rationale:
The serum-ascites albumin gradient (SAAG) is calculated by subtracting the ascites albumin
concentration from the serum albumin concentration. A SAAG value 1.1 g/dL indicates that
portal hypertension is the underlying driver of ascites formation, such as cirrhosis, alcoholic
hepatitis, or right-sided heart failure.
Section 4: Renal & Genitourinary System
Question 7
A patient with chronic kidney disease presents to the emergency department complaining of
generalized muscle weakness and palpitations. An electrocardiogram reveals tall, peaked T
waves, a prolonged PR interval, and widened QRS complexes.
What isalu the underlying electrolyte disturbance?
A. Hypocalcemia
