FCCS – Fundamentals of Critical Care Support
Post-Test Questions and Answers
1. A patient with a GCS of 6 is breathing spontaneously with adequate oxygen
saturation on a non-rebreather mask. Should this patient be intubated, and why?
Answer: Yes, the patient should be intubated.
Rationale: A GCS ≤8 is a widely used threshold indicating inability to protect the airway,
regardless of adequate oxygenation. Airway protective reflexes (cough, gag) are
typically lost at this level of consciousness, placing the patient at high risk for aspiration,
so intubation is indicated for airway protection even if gas exchange is currently
adequate.
2. During rapid sequence intubation, why is cricoid pressure (Sellick maneuver)
traditionally applied, and what is the current evidence-based stance on its routine use?
Answer: It is applied to occlude the esophagus against the cricoid cartilage and reduce
passive regurgitation/aspiration risk, but current evidence does not support its
routine mandatory use.
Rationale: Cricoid pressure was traditionally taught to prevent regurgitation during RSI
by compressing the esophagus. However, contemporary evidence shows it can distort
the airway view, impede intubation, and does not reliably prevent aspiration, so many
current protocols consider it optional and instruct release if it impairs laryngoscopy.
3. A patient requires emergent intubation and has a known difficult airway with
limited neck extension. What is the single most important preparatory step before
attempting laryngoscopy?
Answer: Ensure a backup/rescue airway plan and equipment (e.g., video laryngoscope,
supraglottic airway, surgical airway kit) are immediately available before the first
attempt.
Rationale: FCCS emphasizes anticipating a difficult airway and having a structured
backup plan (difficult airway algorithm) ready before the first attempt, since repeated
failed attempts increase hypoxemia, trauma, and aspiration risk.
4. Explain why preoxygenation with 100% oxygen for 3–5 minutes prior to intubation
is critical in critically ill patients.
Answer: It denitrogenates the functional residual capacity, creating an oxygen
reservoir that extends the safe apnea time during laryngoscopy.
Rationale: Critically ill patients have reduced FRC and higher oxygen consumption, so
they desaturate faster during apnea. Preoxygenation maximizes the oxygen reserve in
the lungs, delaying the onset of hypoxemia while the airway is secured.
,5. After endotracheal intubation, what is the gold-standard method to confirm correct
tracheal (versus esophageal) tube placement?
Answer: Continuous waveform capnography (quantitative end-tidal CO2 detection).
Rationale: Waveform capnography provides a continuous, reliable, breath-to-breath
confirmation of tracheal placement, as sustained CO2 detection over several breaths
indicates the tube is in the trachea. Auscultation and chest rise are supportive but less
reliable than capnography.
6. A ventilated patient develops sudden desaturation, increased peak airway
pressures, and absent breath sounds on the left. What is the most likely cause, and
what is the initial management?
Answer: Right mainstem bronchial intubation (tube migrated too far) or a left-sided
pneumothorax; initial management is to pull back/reposition the tube and reassess,
or needle decompress if tension pneumothorax is suspected.
Rationale: The differential for the 'DOPE' mnemonic (Displacement, Obstruction,
Pneumothorax, Equipment failure) should be applied. Absent left breath sounds with
unchanged right-sided sounds is classic for right mainstem migration; if accompanied by
tracheal deviation, hypotension, and distended neck veins, tension pneumothorax must
be excluded and decompressed emergently.
7. Why is a cuff leak test performed prior to extubation in certain patients, and what
does a failed test indicate?
Answer: It assesses for laryngeal/airway edema; a failed test (absent air leak around a
deflated cuff) suggests significant airway swelling and increased risk of post-
extubation stridor and reintubation.
Rationale: The cuff leak test evaluates whether air can pass around the endotracheal
tube when the cuff is deflated. Absence of a leak suggests the airway lumen is narrowed
by edema, warranting corticosteroid pretreatment, delayed extubation, or extubation
with heightened readiness for reintubation.
8. What physiologic criteria, beyond adequate oxygenation, should be assessed before
determining a patient is ready for a spontaneous breathing trial?
Answer: Hemodynamic stability (minimal/no vasopressor requirement), adequate
mentation to protect the airway, resolving underlying cause of respiratory failure, and
ability to initiate spontaneous breaths.
Rationale: Readiness for weaning requires more than oxygenation; the patient must be
hemodynamically stable, have a manageable secretion burden, adequate cough/airway
protection, and the process driving respiratory failure should be improving before a
spontaneous breathing trial is attempted.
, Mechanical Ventilation
9. A patient with ARDS is ventilated with a tidal volume of 8 mL/kg predicted body
weight and plateau pressure of 32 cmH2O. What change should be made and why?
Answer: Reduce the tidal volume toward 6 mL/kg predicted body weight to bring
plateau pressure below 30 cmH2O.
Rationale: Lung-protective ventilation strategies (ARDSNet protocol) target tidal
volumes of 6 mL/kg PBW and plateau pressures ≤30 cmH2O to minimize ventilator-
induced lung injury (volutrauma and barotrauma) in ARDS patients.
10. Why is predicted body weight, rather than actual body weight, used to calculate
tidal volume settings?
Answer: Because lung size correlates with height and sex, not with actual body weight,
which can be inflated by edema, obesity, or ascites.
Rationale: Using actual body weight in an obese or fluid-overloaded patient would result
in excessive tidal volumes relative to true lung capacity, increasing the risk of ventilator-
induced lung injury; PBW is calculated from height and sex.
11. A patient on volume-control ventilation develops progressively worsening auto-
PEEP (breath stacking). What ventilator adjustments can reduce this?
Answer: Decrease respiratory rate and/or tidal volume, and increase expiratory time
(e.g., by decreasing the inspiratory:expiratory ratio) to allow more complete
exhalation.
Rationale: Auto-PEEP occurs when the next breath is delivered before the previous one is
fully exhaled, common in obstructive disease or high minute ventilation. Reducing
respiratory rate and prolonging expiratory time gives the lungs more time to empty,
reducing dynamic hyperinflation.
12. Explain the physiologic rationale for using higher PEEP levels in a patient with
severe ARDS and diffuse bilateral infiltrates.
Answer: Higher PEEP recruits collapsed alveoli, improves functional residual capacity
and oxygenation, and prevents cyclic alveolar collapse/reopening (atelectrauma)
during the respiratory cycle.
Rationale: In ARDS, many alveoli are flooded or collapsed. Adequate PEEP keeps
recruitable alveoli open throughout the respiratory cycle, improving ventilation-
perfusion matching and oxygenation while reducing shear injury from repetitive opening
and closing.
Post-Test Questions and Answers
1. A patient with a GCS of 6 is breathing spontaneously with adequate oxygen
saturation on a non-rebreather mask. Should this patient be intubated, and why?
Answer: Yes, the patient should be intubated.
Rationale: A GCS ≤8 is a widely used threshold indicating inability to protect the airway,
regardless of adequate oxygenation. Airway protective reflexes (cough, gag) are
typically lost at this level of consciousness, placing the patient at high risk for aspiration,
so intubation is indicated for airway protection even if gas exchange is currently
adequate.
2. During rapid sequence intubation, why is cricoid pressure (Sellick maneuver)
traditionally applied, and what is the current evidence-based stance on its routine use?
Answer: It is applied to occlude the esophagus against the cricoid cartilage and reduce
passive regurgitation/aspiration risk, but current evidence does not support its
routine mandatory use.
Rationale: Cricoid pressure was traditionally taught to prevent regurgitation during RSI
by compressing the esophagus. However, contemporary evidence shows it can distort
the airway view, impede intubation, and does not reliably prevent aspiration, so many
current protocols consider it optional and instruct release if it impairs laryngoscopy.
3. A patient requires emergent intubation and has a known difficult airway with
limited neck extension. What is the single most important preparatory step before
attempting laryngoscopy?
Answer: Ensure a backup/rescue airway plan and equipment (e.g., video laryngoscope,
supraglottic airway, surgical airway kit) are immediately available before the first
attempt.
Rationale: FCCS emphasizes anticipating a difficult airway and having a structured
backup plan (difficult airway algorithm) ready before the first attempt, since repeated
failed attempts increase hypoxemia, trauma, and aspiration risk.
4. Explain why preoxygenation with 100% oxygen for 3–5 minutes prior to intubation
is critical in critically ill patients.
Answer: It denitrogenates the functional residual capacity, creating an oxygen
reservoir that extends the safe apnea time during laryngoscopy.
Rationale: Critically ill patients have reduced FRC and higher oxygen consumption, so
they desaturate faster during apnea. Preoxygenation maximizes the oxygen reserve in
the lungs, delaying the onset of hypoxemia while the airway is secured.
,5. After endotracheal intubation, what is the gold-standard method to confirm correct
tracheal (versus esophageal) tube placement?
Answer: Continuous waveform capnography (quantitative end-tidal CO2 detection).
Rationale: Waveform capnography provides a continuous, reliable, breath-to-breath
confirmation of tracheal placement, as sustained CO2 detection over several breaths
indicates the tube is in the trachea. Auscultation and chest rise are supportive but less
reliable than capnography.
6. A ventilated patient develops sudden desaturation, increased peak airway
pressures, and absent breath sounds on the left. What is the most likely cause, and
what is the initial management?
Answer: Right mainstem bronchial intubation (tube migrated too far) or a left-sided
pneumothorax; initial management is to pull back/reposition the tube and reassess,
or needle decompress if tension pneumothorax is suspected.
Rationale: The differential for the 'DOPE' mnemonic (Displacement, Obstruction,
Pneumothorax, Equipment failure) should be applied. Absent left breath sounds with
unchanged right-sided sounds is classic for right mainstem migration; if accompanied by
tracheal deviation, hypotension, and distended neck veins, tension pneumothorax must
be excluded and decompressed emergently.
7. Why is a cuff leak test performed prior to extubation in certain patients, and what
does a failed test indicate?
Answer: It assesses for laryngeal/airway edema; a failed test (absent air leak around a
deflated cuff) suggests significant airway swelling and increased risk of post-
extubation stridor and reintubation.
Rationale: The cuff leak test evaluates whether air can pass around the endotracheal
tube when the cuff is deflated. Absence of a leak suggests the airway lumen is narrowed
by edema, warranting corticosteroid pretreatment, delayed extubation, or extubation
with heightened readiness for reintubation.
8. What physiologic criteria, beyond adequate oxygenation, should be assessed before
determining a patient is ready for a spontaneous breathing trial?
Answer: Hemodynamic stability (minimal/no vasopressor requirement), adequate
mentation to protect the airway, resolving underlying cause of respiratory failure, and
ability to initiate spontaneous breaths.
Rationale: Readiness for weaning requires more than oxygenation; the patient must be
hemodynamically stable, have a manageable secretion burden, adequate cough/airway
protection, and the process driving respiratory failure should be improving before a
spontaneous breathing trial is attempted.
, Mechanical Ventilation
9. A patient with ARDS is ventilated with a tidal volume of 8 mL/kg predicted body
weight and plateau pressure of 32 cmH2O. What change should be made and why?
Answer: Reduce the tidal volume toward 6 mL/kg predicted body weight to bring
plateau pressure below 30 cmH2O.
Rationale: Lung-protective ventilation strategies (ARDSNet protocol) target tidal
volumes of 6 mL/kg PBW and plateau pressures ≤30 cmH2O to minimize ventilator-
induced lung injury (volutrauma and barotrauma) in ARDS patients.
10. Why is predicted body weight, rather than actual body weight, used to calculate
tidal volume settings?
Answer: Because lung size correlates with height and sex, not with actual body weight,
which can be inflated by edema, obesity, or ascites.
Rationale: Using actual body weight in an obese or fluid-overloaded patient would result
in excessive tidal volumes relative to true lung capacity, increasing the risk of ventilator-
induced lung injury; PBW is calculated from height and sex.
11. A patient on volume-control ventilation develops progressively worsening auto-
PEEP (breath stacking). What ventilator adjustments can reduce this?
Answer: Decrease respiratory rate and/or tidal volume, and increase expiratory time
(e.g., by decreasing the inspiratory:expiratory ratio) to allow more complete
exhalation.
Rationale: Auto-PEEP occurs when the next breath is delivered before the previous one is
fully exhaled, common in obstructive disease or high minute ventilation. Reducing
respiratory rate and prolonging expiratory time gives the lungs more time to empty,
reducing dynamic hyperinflation.
12. Explain the physiologic rationale for using higher PEEP levels in a patient with
severe ARDS and diffuse bilateral infiltrates.
Answer: Higher PEEP recruits collapsed alveoli, improves functional residual capacity
and oxygenation, and prevents cyclic alveolar collapse/reopening (atelectrauma)
during the respiratory cycle.
Rationale: In ARDS, many alveoli are flooded or collapsed. Adequate PEEP keeps
recruitable alveoli open throughout the respiratory cycle, improving ventilation-
perfusion matching and oxygenation while reducing shear injury from repetitive opening
and closing.
