ITE Pulmonary and Critical Care Questions and Answers — Questions and Answers
Question 1: A 58-year-old male is admitted to the ICU with sepsis and develops acute respiratory distress syndrome (ARDS). He is intubated and placed on mechanical ventilation. His height is 178 cm (5'10") and his ideal body weight is 75 kg. According to the ARDSNet protocol and current clinical practice guidelines, which of the following represents the most appropriate initial ventilator settings?
- Tidal volume of 750 mL, PEEP of 5 cm H₂O, and plateau pressure < 40 cm H₂O
- Tidal volume of 450 mL, PEEP of 10 cm H₂O, and plateau pressure < 30 cm H₂O (Correct answer)
- Tidal volume of 600 mL, PEEP of 5 cm H₂O, and permissive hypercapnia is strictly avoided
- Tidal volume of 300 mL, PEEP of 15 cm H₂O, and respiratory rate of 35 breaths/min
Correct answer: Tidal volume of 450 mL, PEEP of 10 cm H₂O, and plateau pressure < 30 cm H₂O
The cornerstone of mechanical ventilation in ARDS is a lung-protective strategy to minimize ventilator-induced lung injury. This involves using a low tidal volume, typically 4-8 mL/kg of ideal body weight. For this 75 kg patient, 450 mL (6 mL/kg) is an appropriate initial tidal volume. Additionally, maintaining a plateau pressure (the pressure in the alveoli at the end of inspiration) below 30 cm H₂O is crucial to prevent barotrauma. An adequate level of PEEP (Positive End-Expiratory Pressure) is also used to prevent alveolar collapse and improve oxygenation. A PEEP of 10 cm H₂O is a reasonable starting point in moderate-to-severe ARDS.
Question 2: A 24-year-old female with a known history of intermittent asthma presents to the urgent care clinic with complaints of wheezing and shortness of breath for the past two days. She uses her albuterol inhaler 4-5 times a day with partial relief. She has no daily controller medication. According to the 2024 GINA guidelines, which of the following is the most appropriate long-term management plan to initiate?
- Continue with as-needed short-acting beta-agonist (SABA) only
- Prescribe a daily low-dose inhaled corticosteroid (ICS) and continue SABA as needed
- Prescribe as-needed low-dose inhaled corticosteroid (ICS)-formoterol (Correct answer)
- Prescribe a daily long-acting beta-agonist (LABA) inhaler
Correct answer: Prescribe as-needed low-dose inhaled corticosteroid (ICS)-formoterol
The 2024 Global Initiative for Asthma (GINA) guidelines strongly recommend against treatment with a short-acting beta-agonist (SABA) alone due to safety concerns. The preferred approach (Track 1) for patients with mild asthma (symptoms less than daily) is to use an as-needed low-dose inhaled corticosteroid (ICS)-formoterol combination inhaler. This strategy provides both rapid symptom relief from the formoterol and anti-inflammatory action from the ICS, reducing the risk of severe exacerbations compared to SABA-only treatment.
Question 3: A 66-year-old male with a history of COPD presents to the emergency department with increased dyspnea, cough, and sputum production. He has a history of two exacerbations in the past year. His blood eosinophil count is 350 cells/µL. According to the 2024 GOLD report, which of the following is the most appropriate initial pharmacologic management for this patient's chronic condition?
- A long-acting muscarinic antagonist (LAMA) monotherapy
- A combination of a long-acting beta-agonist (LABA) and a long-acting muscarinic antagonist (LAMA)
- A combination of an inhaled corticosteroid (ICS), a long-acting beta-agonist (LABA), and a long-acting muscarinic antagonist (LAMA) (Correct answer)
- A short-acting beta-agonist (SABA) as needed with no maintenance therapy
Correct answer: A combination of an inhaled corticosteroid (ICS), a long-acting beta-agonist (LABA), and a long-acting muscarinic antagonist (LAMA)
According to the 2024 GOLD guidelines, for a patient with a history of frequent exacerbations (≥2 in the past year) and a blood eosinophil count ≥300 cells/µL, initial therapy with a triple combination of ICS/LABA/LAMA is recommended. This approach targets bronchoconstriction with the dual bronchodilators (LABA/LAMA) and airway inflammation with the ICS, which is particularly beneficial in patients with eosinophilic features.
Question 4: A 72-year-old female is brought to the emergency department from a nursing home with a fever of 39.1°C (102.4°F), a respiratory rate of 28 breaths/min, and confusion. Her blood pressure is 85/50 mmHg despite receiving a 1L bolus of normal saline. A chest X-ray confirms a right lower lobe pneumonia. According to the Surviving Sepsis Campaign guidelines, which of the following interventions is the highest priority within the first hour of recognition?
- Administering a 30 mL/kg crystalloid fluid bolus
- Obtaining blood cultures and administering broad-spectrum antibiotics (Correct answer)
- Measuring serum lactate level
- Initiating vasopressor therapy with norepinephrine
Correct answer: Obtaining blood cultures and administering broad-spectrum antibiotics
The Surviving Sepsis Campaign guidelines emphasize the immediate initiation of treatment in patients with sepsis and septic shock. The 'Hour-1 Bundle' includes several critical actions. While fluid resuscitation (30 mL/kg crystalloid for hypotension) and measuring lactate are essential, the highest priority is to obtain blood cultures *before* administering broad-spectrum antibiotics, with the goal of starting antibiotics within the first hour of recognition. Delayed antibiotic administration is associated with increased mortality.
Question 5: A 65-year-old patient is mechanically ventilated in the ICU for pneumonia. The clinical team is discussing the sedation strategy. Which of the following approaches has been associated with improved clinical outcomes, including shorter duration of mechanical ventilation and ICU length of stay?
- Maintaining deep sedation (RASS -4 to -5) to ensure patient comfort and prevent ventilator recall
- Using daily sedation interruptions combined with a protocol targeting light sedation (RASS 0 to -2) (Correct answer)
- Administering continuous high-dose benzodiazepines without a daily awakening trial
- Avoiding all sedation and analgesia to promote rapid extubation
Correct answer: Using daily sedation interruptions combined with a protocol targeting light sedation (RASS 0 to -2)
Maintaining a light level of sedation (e.g., Richmond Agitation-Sedation Scale [RASS] 0 to -2) in critically ill, mechanically ventilated patients is associated with better outcomes. Studies have shown that strategies combining daily interruptions of sedative infusions ('sedation vacations') with protocols that target light sedation lead to a shorter duration of mechanical ventilation, reduced ICU length of stay, and decreased incidence of delirium without increasing psychological stress. Deep sedation is associated with adverse outcomes, while avoiding all sedation may not be feasible or safe for all patients.
Question 6: A 78-year-old man is admitted to the hospital with radiographically confirmed community-acquired pneumonia (CAP). He is clinically stable with normal vital signs, mental status, and oral intake. According to the most recent American Thoracic Society (ATS)/Infectious Diseases Society of America (IDSA) guidelines, which of the following is an appropriate duration of antibiotic therapy for this patient?
- A fixed 10-day course of antibiotics
- Antibiotic therapy for at least 14 days
- A course of 3-5 days, provided he has achieved clinical stability (Correct answer)
- Antibiotic treatment until the C-reactive protein level normalizes
Correct answer: A course of 3-5 days, provided he has achieved clinical stability
Recent updates to the ATS/IDSA guidelines for community-acquired pneumonia recommend a shorter duration of antibiotic therapy for patients who are clinically stable. For both outpatients and inpatients with non-severe CAP who achieve clinical stability (resolution of vital sign abnormalities, ability to eat, normal mentation), a course of antibiotics as short as 3-5 days is now conditionally recommended. This is a shift from previous recommendations of longer, fixed-duration courses and aims to reduce antibiotic exposure and resistance.
ITE Pulmonary and Critical Care Questions and Answers
A 58-year-old male is admitted to the ICU with sepsis and develops acute respiratory distress syndrome (ARDS).
He is intubated and placed on mechanical ventilation.
His height is 178 cm (5'10") and his ideal body weight is 75 kg.
According to the ARDSNet protocol and current clinical practice guidelines, which of the following represents the most appropriate initial ventilator settings?