RRT Clinical Simulations (CSE) – NBRC
Practice Scenarios with Verified Answers
2026
Domain 1: Patient Assessment & Diagnostics (Questions 1-25)
1. A 'flat' sound heard during chest percussion is most closely associated with:
A. Empty, air-filled space
B. Fatty tissue
C. Bone
D. Consolidation
Answer: C. Bone
Rationale: A flat percussion sound indicates very dense tissue with minimal
vibration, which is characteristic of percussing over solid structures like bone or
muscle. Resonant is normal lung, Hyperresonant is air trapping
(COPD/Pneumothorax), and Dull indicates fluid/consolidation .
2. For a patient with suspected pleural effusion, which radiography procedure
is most helpful?
A. Apical lordotic radiograph
B. PA chest radiograph
C. Lateral decubitus radiograph
D. AP chest radiograph
,Answer: C. Lateral decubitus radiograph
Rationale: In a lateral decubitus view (patient lying on their side), small amounts of
fluid will layer out along the dependent chest wall, making effusions as small as 5
mL visible. A standard PA view requires at least 175-200 mL to be noticeable .
3. To determine mixed venous oxygen saturation (SvO2), blood should be
drawn from:
A. Pulmonary artery
B. Pulmonary vein
C. Vena cava
D. Aorta
Answer: A. Pulmonary artery
Rationale: Mixed venous blood represents the oxygen saturation of blood returning
to the right side of the heart after systemic extraction. It is obtained by drawing
blood from the distal port of a pulmonary artery (Swan-Ganz) catheter .
4. A patient with COPD has an FEV1/FVC ratio of 65%. To confirm emphysema,
you would check:
A. DLCO
B. FEF25-75%
C. Nitrogen washout
D. Peak flow
Answer: A. DLCO (Diffusing Capacity of the Lungs for Carbon Monoxide)
Rationale: While a low FEV1/FVC confirms obstruction, a reduced DLCO
specifically indicates damage to the alveolar-capillary membrane, which is the
hallmark of emphysema. In chronic bronchitis, the DLCO is usually normal .
5. For a patient with suspected pulmonary embolism (PE), the most helpful
bedside screening tool is:
A. CO-oximeter
B. Capnometer
,C. E-Zcap CO2 detector
D. Radio-doppler
Answer: B. Capnometer
Rationale: A sudden drop in end-tidal CO2 (EtCO2) with a widening of the arterial-
to-etCO2 gradient suggests increased dead space ventilation, a classic sign of
pulmonary embolism where blood is shunted away from alveoli .
6. Ascites is defined as accumulation of fluid in the abdomen caused by:
A. Heart failure
B. Liver failure
C. Kidney failure
D. Malnutrition
Answer: B. Liver failure
Rationale: Ascites is the accumulation of serous fluid in the peritoneal cavity, most
commonly resulting from portal hypertension secondary to liver cirrhosis or failure .
7. Pulsus paradoxus (a drop in BP during inspiration) is a key sign of:
A. Simple pneumothorax
B. Severe status asthmaticus
C. Chronic bronchitis
D. Pulmonary fibrosis
Answer: B. Severe status asthmaticus
Rationale: Pulsus paradoxus occurs when large negative intrapleural pressures
during inspiration (due to severe airway obstruction) reduce left ventricular filling. It
is a hallmark of severe asthma exacerbation or cardiac tamponade .
8. A patient presents with a "barking" cough and a "steeple sign" on a neck X-
ray. This indicates:
A. Epiglottitis
B. Bacterial pneumonia
, C. Croup (Laryngotracheobronchitis)
D. Foreign body aspiration
Answer: C. Croup
Rationale: Croup is a viral infection causing subglottic swelling, which appears as a
"steeple sign" (narrowing of the trachea) on X-ray. Epiglottitis presents with a
"thumb sign" .
9. Cheyne-Stokes respiration is characterized by:
A. Rapid deep breathing with regular rhythm
B. Gradually increasing then decreasing rate/depth followed by apnea
C. Irregular rate/depth with random apneas
D. Prolonged inspiratory gasp
Answer: B. Gradually increasing then decreasing rate/depth followed by apnea
Rationale: Cheyne-Stokes respirations typically cycle over 30-180 seconds and
are associated with increased intracranial pressure (ICP), heart failure, or drug
overdoses .
10. What is the normal value for Cerebral Perfusion Pressure (CPP)?
A. 0 - 10 mmHg
B. 20 - 40 mmHg
C. 70 - 90 mmHg
D. 150 - 180 mmHg
Answer: C. 70 - 90 mmHg
Rationale: CPP = MAP (Mean Arterial Pressure) - ICP (Intracranial Pressure). It
requires a pressure of at least 70 mmHg to maintain adequate blood flow to the
brain; below this threshold, ischemia occurs .
11. Yellow sputum is indicative of:
A. Presence of white blood cells (bacterial infection)
B. Old blood (resolving hematoma)
Practice Scenarios with Verified Answers
2026
Domain 1: Patient Assessment & Diagnostics (Questions 1-25)
1. A 'flat' sound heard during chest percussion is most closely associated with:
A. Empty, air-filled space
B. Fatty tissue
C. Bone
D. Consolidation
Answer: C. Bone
Rationale: A flat percussion sound indicates very dense tissue with minimal
vibration, which is characteristic of percussing over solid structures like bone or
muscle. Resonant is normal lung, Hyperresonant is air trapping
(COPD/Pneumothorax), and Dull indicates fluid/consolidation .
2. For a patient with suspected pleural effusion, which radiography procedure
is most helpful?
A. Apical lordotic radiograph
B. PA chest radiograph
C. Lateral decubitus radiograph
D. AP chest radiograph
,Answer: C. Lateral decubitus radiograph
Rationale: In a lateral decubitus view (patient lying on their side), small amounts of
fluid will layer out along the dependent chest wall, making effusions as small as 5
mL visible. A standard PA view requires at least 175-200 mL to be noticeable .
3. To determine mixed venous oxygen saturation (SvO2), blood should be
drawn from:
A. Pulmonary artery
B. Pulmonary vein
C. Vena cava
D. Aorta
Answer: A. Pulmonary artery
Rationale: Mixed venous blood represents the oxygen saturation of blood returning
to the right side of the heart after systemic extraction. It is obtained by drawing
blood from the distal port of a pulmonary artery (Swan-Ganz) catheter .
4. A patient with COPD has an FEV1/FVC ratio of 65%. To confirm emphysema,
you would check:
A. DLCO
B. FEF25-75%
C. Nitrogen washout
D. Peak flow
Answer: A. DLCO (Diffusing Capacity of the Lungs for Carbon Monoxide)
Rationale: While a low FEV1/FVC confirms obstruction, a reduced DLCO
specifically indicates damage to the alveolar-capillary membrane, which is the
hallmark of emphysema. In chronic bronchitis, the DLCO is usually normal .
5. For a patient with suspected pulmonary embolism (PE), the most helpful
bedside screening tool is:
A. CO-oximeter
B. Capnometer
,C. E-Zcap CO2 detector
D. Radio-doppler
Answer: B. Capnometer
Rationale: A sudden drop in end-tidal CO2 (EtCO2) with a widening of the arterial-
to-etCO2 gradient suggests increased dead space ventilation, a classic sign of
pulmonary embolism where blood is shunted away from alveoli .
6. Ascites is defined as accumulation of fluid in the abdomen caused by:
A. Heart failure
B. Liver failure
C. Kidney failure
D. Malnutrition
Answer: B. Liver failure
Rationale: Ascites is the accumulation of serous fluid in the peritoneal cavity, most
commonly resulting from portal hypertension secondary to liver cirrhosis or failure .
7. Pulsus paradoxus (a drop in BP during inspiration) is a key sign of:
A. Simple pneumothorax
B. Severe status asthmaticus
C. Chronic bronchitis
D. Pulmonary fibrosis
Answer: B. Severe status asthmaticus
Rationale: Pulsus paradoxus occurs when large negative intrapleural pressures
during inspiration (due to severe airway obstruction) reduce left ventricular filling. It
is a hallmark of severe asthma exacerbation or cardiac tamponade .
8. A patient presents with a "barking" cough and a "steeple sign" on a neck X-
ray. This indicates:
A. Epiglottitis
B. Bacterial pneumonia
, C. Croup (Laryngotracheobronchitis)
D. Foreign body aspiration
Answer: C. Croup
Rationale: Croup is a viral infection causing subglottic swelling, which appears as a
"steeple sign" (narrowing of the trachea) on X-ray. Epiglottitis presents with a
"thumb sign" .
9. Cheyne-Stokes respiration is characterized by:
A. Rapid deep breathing with regular rhythm
B. Gradually increasing then decreasing rate/depth followed by apnea
C. Irregular rate/depth with random apneas
D. Prolonged inspiratory gasp
Answer: B. Gradually increasing then decreasing rate/depth followed by apnea
Rationale: Cheyne-Stokes respirations typically cycle over 30-180 seconds and
are associated with increased intracranial pressure (ICP), heart failure, or drug
overdoses .
10. What is the normal value for Cerebral Perfusion Pressure (CPP)?
A. 0 - 10 mmHg
B. 20 - 40 mmHg
C. 70 - 90 mmHg
D. 150 - 180 mmHg
Answer: C. 70 - 90 mmHg
Rationale: CPP = MAP (Mean Arterial Pressure) - ICP (Intracranial Pressure). It
requires a pressure of at least 70 mmHg to maintain adequate blood flow to the
brain; below this threshold, ischemia occurs .
11. Yellow sputum is indicative of:
A. Presence of white blood cells (bacterial infection)
B. Old blood (resolving hematoma)
