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A 54-year-old woman is evaluated in the intensive care unit for worsening respiratory distress. She was admitted 48 hours ago for a severe right lower lobe community-acquired pneumonia and was started on intravenous ceftriaxone and azithromycin. Blood and sputum cultures drawn on admission are now growing *Streptococcus pneumoniae* susceptible to penicillin.

Current vital signs are:
Temperature: 38.9°C (102.0°F)
Pulse: 124/min
Blood pressure: 82/50 mmHg
Respirations: 32/min
SpO2: 87% on a high-flow nasal cannula (FiO2 60%)

Over the past 4 hours, she has received 3 L of intravenous normal saline without improvement in her blood pressure. Physical examination reveals cool, mottled extremities. Jugular venous pressure is 5 cm H2O. Pulmonary auscultation reveals diffuse bilateral crackles, a change from the isolated right-sided crackles noted on admission. A bedside chest radiograph demonstrates new, diffuse bilateral alveolar opacities in addition to the right lower lobe consolidation.

Laboratory results:
Leukocytes: 18,500/mm³
Serum sodium: 138 mEq/L
Serum potassium: 4.8 mEq/L
Serum chloride: 101 mEq/L
Serum bicarbonate: 13 mEq/L
Blood urea nitrogen: 34 mg/dL
Serum creatinine: 2.2 mg/dL
Serum lactate: 6.5 mmol/L

Arterial blood gas (on HFNC 60%):
pH: 7.20
PaCO2: 35 mmHg
PaO2: 55 mmHg

Which of the following statements regarding this patient's condition and management are correct? (Select all that apply)

During a routine outpatient follow-up, a 69-year-old retired carpenter complains of gradually increasing swelling in both ankles over the past month. He has a 45-pack-year smoking history and severe chronic obstructive pulmonary disease. The patient states his chronic daily cough and baseline exertional shortness of breath have not worsened. He denies waking up gasping for air at night and sleeps comfortably on a single pillow. He is afebrile. Vital signs show a blood pressure of 118/76 mm Hg, a pulse of 84/min, and a respiratory rate of 18/min. Pulse oximetry reveals an oxygen saturation of 87% on room air. Physical examination demonstrates an elevated jugular venous pressure, a prominent right ventricular heave, and 2+ bilateral pitting edema up to the shins. Auscultation of the lungs reveals distant breath sounds with prolonged expiration but no crackles. A basic metabolic panel reveals a serum bicarbonate of 32 mEq/L. Which of the following management steps is most likely to improve this patient's long-term survival?

A 42-year-old woman presents to the clinic with progressively worsening exertional dyspnea and fatigue over the past 6 months. She has no significant past medical history and takes no medications. Physical examination reveals a prominent jugular venous a-wave, a loud pulmonic component of the second heart sound (P2), a right ventricular heave, and trace bilateral pedal edema. Her lungs are clear to auscultation. Pulmonary function testing demonstrates normal spirometry with an isolated reduction in the diffusing capacity of the lungs for carbon monoxide (DLCO). Arrange the following diagnostic and therapeutic steps in the most appropriate chronological sequence for evaluating and managing this patient's condition.

A $74$-year-old woman is brought to the emergency department via ambulance with acute, severe respiratory distress that awoke her from sleep $30$ minutes ago. She is profoundly diaphoretic, anxious, and sitting bolt upright on the stretcher. Her blood pressure is $240/130$ mm Hg, heart rate is $128$/min, and respiratory rate is $38$/min. Oxygen saturation is $82\%$ on room air. Physical examination reveals a hyperdynamic precordium and diffuse, coarse crackles auscultated throughout all lung fields bilaterally. There is no significant lower extremity edema. Arrange the following therapeutic interventions in the most appropriate chronological sequence for the optimal acute management of this patient's condition.

A 55-year-old man is evaluated in the intensive care unit on his fourth day of mechanical ventilation for acute respiratory distress syndrome secondary to severe pneumonia. Over the past 48 hours, his clinical status has markedly improved. His fraction of inspired oxygen (FiO2) requirement has decreased to 35%, his positive end-expiratory pressure (PEEP) is at a minimal setting, and he no longer requires vasopressor support. The critical care team decides to initiate the protocol to liberate him from the ventilator. Arrange the following steps in the standard sequential order for evaluating and performing ventilator liberation.

An emergency department physician evaluates a 67-year-old man due to four days of escalating dyspnea and nocturnal coughing. The patient reports having to sleep upright in a recliner to avoid respiratory distress. His medical background includes type 2 diabetes, essential hypertension, and osteoarthritis. He recently began taking over-the-counter ibuprofen around the clock for severe knee pain. He smoked one pack of cigarettes daily for 35 years but ceased a decade ago. Temperature is 37.0°C (98.6°F), blood pressure is 158/92 mm Hg, pulse is 112/min, and respirations are 22/min. Pulse oximetry is 92% on room air. Physical examination reveals an anxious patient utilizing accessory respiratory muscles. Jugular venous pressure is elevated at 11 cm H2O. Chest auscultation demonstrates bibasilar dullness to percussion and widespread expiratory wheezes. Cardiac evaluation shows a regular rhythm with a normal S1 and S2, accompanied by a low-frequency sound occurring shortly after S2. Moderate pitting edema is present up to the mid-shins bilaterally. Which of the following is the most appropriate initial pharmacotherapy for this patient?

During morning rounds in the medical intensive care unit, a physician evaluates a 69-year-old male who was intubated two days prior for hypercapnic respiratory failure. The patient has a medical history significant for severe emphysema and hypertension. He initially presented to the emergency department with a severe exacerbation characterized by a productive cough and severe dyspnea, leading to emergent intubation. He is currently mechanically ventilated in the volume assist-control mode.

Today, his temperature is $38.9^\circ\text{C}$ ($102.0^\circ\text{F}$), blood pressure is $94/62\text{ mm Hg}$, heart rate is $116/\text{min}$, and oxygen saturation is $93\%$ on an $FiO_2$ of $0.50$ and a positive end-expiratory pressure (PEEP) of $8\text{ cm H}_2\text{O}$. The set respiratory rate is $14/\text{min}$.

Physical examination reveals diminished breath sounds bilaterally with a notably prolonged expiratory phase. A central venous catheter and a pulmonary artery catheter are in place. Hemodynamic monitoring shows a central venous pressure (CVP) of $15\text{ mm Hg}$ and a pulmonary capillary wedge pressure (PCWP) of $10\text{ mm Hg}$.

Laboratory results are as follows:
Leukocyte count: $19,200/\text{mm}^3$
Serum sodium: $141\text{ mEq/L}$
Serum chloride: $103\text{ mEq/L}$
Serum bicarbonate: $16\text{ mEq/L}$
Serum creatinine: $1.9\text{ mg/dL}$ (baseline $1.1\text{ mg/dL}$)

Arterial blood gas analysis (on current ventilator settings):
pH: $7.24$
$pCO_2$: $38\text{ mm Hg}$
$pO_2$: $65\text{ mm Hg}$

A tracheal aspirate culture obtained at the time of intubation has grown heavy growth of *Staphylococcus aureus* that is susceptible to oxacillin, cefazolin, and vancomycin. The patient is currently receiving empiric intravenous meropenem and vancomycin.

Which of the following is the most appropriate next step in the management of this patient?

A 24-year-old woman is brought to the emergency department for severe shortness of breath that began 8 hours ago. She has a history of persistent asthma that has been poorly controlled over the past month. On arrival, she is visibly exhausted, diaphoretic, and speaking in single words.

Vital signs are:
Temperature: $37.1^\circ\text{C}$ ($98.8^\circ\text{F}$)
Blood pressure: 138/85 mm Hg
Heart rate: 128/min
Respiratory rate: 32/min
Oxygen saturation: 91% on room air.

Physical examination reveals profound accessory muscle use, paradoxical abdominal breathing, and diffuse expiratory wheezing. She is immediately started on continuous nebulized albuterol and ipratropium, intravenous methylprednisolone, and supplemental oxygen.

Forty-five minutes later, the patient states she is feeling 'too tired to breathe.' Her heart rate is 115/min and her respiratory rate is 16/min. Lung auscultation reveals markedly diminished breath sounds bilaterally with minimal wheezing. Arterial blood gas analysis on 40% $\text{FiO}_2$ reveals:

$\text{pH}$: 7.37
$\text{PaCO}_2$: 44 mm Hg
$\text{PaO}_2$: 68 mm Hg
$\text{HCO}_3^-$: 24 mEq/L

Which of the following is the most appropriate next step in management?

A 65-year-old man presents to the emergency department reporting a 2-day history of worsening dyspnea, increased cough, and a change in his sputum from clear to yellow-green. He has a 40-pack-year smoking history and a known diagnosis of chronic obstructive pulmonary disease. His current medications include a daily tiotropium inhaler and albuterol as needed. Vital signs show a temperature of 37.8°C (100.0°F), blood pressure of 145/88 mm Hg, pulse of 105/min, and respiratory rate of 24/min. Pulse oximetry reveals an oxygen saturation of 87% on ambient air. Physical examination is notable for a prolonged expiratory phase with diffuse bilateral wheezing. Cardiac examination shows a regular rate and rhythm without murmurs, rubs, or gallops. There is no jugular venous distention, and the lower extremities are free of edema.

Which of the following interventions are appropriate for the initial management of this patient? (Select all that apply)

A 58-year-old man is brought to the emergency department by his wife due to worsening confusion and lethargy over the past 24 hours. The patient has a history of alcohol-induced cirrhosis and portal hypertension. He has not had any recent fever, falls, or changes in his medications. Vital signs are within normal limits. On physical examination, he is disoriented to time and place. Scleral icterus is present. When asked to hold his arms outstretched with wrists extended, a sudden, brief downward flapping of the hands is observed. Laboratory studies show a normal leukocyte count, an elevated serum ammonia level, and normal serum electrolytes. Which of the following is the most appropriate next step in management?

A $50$-year-old man presents to the clinic with a $6$-month history of progressively worsening exertional dyspnea, fatigue, and bilateral lower extremity swelling. He also reports frequent morning headaches and excessive daytime sleepiness that interferes with his work. He does not smoke and has no history of pulmonary disease. His body mass index (BMI) is $44 \text{ kg/m}^2$.

Vital signs show a blood pressure of $148/92 \text{ mmHg}$, a heart rate of $88/\text{min}$, and a respiratory rate of $16/\text{min}$. Pulse oximetry on room air is $87\%$. Physical examination reveals an obese man with a thick neck. Cardiac auscultation demonstrates a loud pulmonic component of the second heart sound ($P_2$). Lungs are clear to auscultation bilaterally. He has $2+$ pitting edema in both lower extremities.

Laboratory evaluation reveals a hematocrit of $58\%$. An arterial blood gas on room air shows:

Which of the following is the most appropriate initial long-term management for this patient's underlying condition?

Match each of the following gastrointestinal disorders with its classic characteristic endoscopic or histopathologic finding.

A 62-year-old male with a history of severe chronic obstructive pulmonary disease presents to an urgent care facility due to a two-day history of progressively worsening shortness of breath. The patient reports that his baseline chronic cough has increased in frequency, but he explicitly states his sputum remains clear and minimal in amount. He denies any fever, chills, orthopnea, or swelling in his legs. His current medications include a daily long-acting muscarinic antagonist and an albuterol inhaler, which he has been using every two hours today with minimal relief. Vital signs reveal a temperature of 37.0°C (98.6°F), blood pressure of 142/88 mm Hg, heart rate of 96/min, and respiratory rate of 22/min. Oxygen saturation is 92% on his baseline 2 L/min nasal cannula. Physical examination demonstrates a barrel-shaped chest, distant heart sounds, and a prolonged expiratory phase with scattered end-expiratory wheezes. Jugular venous pressure is normal, and there is no peripheral edema. Which of the following is the most appropriate next step in management?

A $42$-year-old woman is receiving continuous mechanical ventilation in the critical care unit due to severe acute respiratory distress syndrome (ARDS) secondary to viral pneumonitis. Over the past $12$ hours, her oxygen saturation has declined to $84\%$ despite aggressive optimization of sedation and initiation of a continuous cisatracurium infusion.

Currently, she is receiving norepinephrine at $0.15$ $\mu\text{g/kg/min}$. Vital signs show a blood pressure of $105/65$ mmHg and a heart rate of $98$/min.

Ventilator parameters (Volume Assist-Control mode) are set as follows:
- Tidal volume: $380$ mL ($6$ mL/kg predicted body weight)
- Respiratory rate: $28$/min
- $\text{FiO}_2$: $0.95$
- PEEP: $16$ cm $\text{H}_2\text{O}$

The ventilator display indicates a peak airway pressure of $48$ cm $\text{H}_2\text{O}$ and a plateau airway pressure of $38$ cm $\text{H}_2\text{O}$.

An arterial blood gas demonstrates:
- pH: $7.21$
- $\text{pCO}_2$: $58$ mmHg
- $\text{pO}_2$: $52$ mmHg
- $\text{HCO}_3^-$: $23$ mEq/L

Which of the following interventions should be implemented immediately? (Select all that apply)

A $28$-year-old woman is brought to the emergency department after coughing up approximately $800 \text{ mL}$ of bright red blood over the past two hours. She has a history of cystic fibrosis and recurrent respiratory tract infections. On arrival, she is in severe respiratory distress, actively expectorating blood, and appears cyanotic. Vital signs are temperature $37.4^\circ\text{C}$ ($99.3^\circ\text{F}$), heart rate $135/\text{min}$, respiratory rate $34/\text{min}$, and blood pressure $85/50 \text{ mm Hg}$. Oxygen saturation is $82\%$ on room air. Breath sounds are diminished bilaterally with coarse rhonchi. Arrange the following interventions in the most appropriate sequential order for managing this patient's condition.

An emergency response team evaluates a $65$-year-old female in the resuscitation bay for sudden-onset respiratory distress. The patient's husband states she has been experiencing progressive exertional fatigue over the past week and abruptly awoke gasping for air early this morning. Her medical history includes diet-controlled type 2 diabetes, essential hypertension, and a long-standing history of tobacco use ($45$ pack-years). Her home medications are metformin and lisinopril, though she admits to frequent nonadherence.

Upon initial assessment, her temperature is $36.8^{\circ}\text{C}$ ($98.2^{\circ}\text{F}$), blood pressure is $192/110\text{ mm Hg}$, pulse is $118/\text{min}$, and respiratory rate is $30/\text{min}$. Pulse oximetry displays an oxygen saturation of $86\%$ on ambient air. The patient is diaphoretic and speaks in one-word sentences. Pulmonary auscultation reveals widespread, high-pitched expiratory wheezing; no rales are present. Heart rhythm is rapid and regular. Examination of the neck shows prominent sternocleidomastoid retractions, making venous assessment difficult.

An arterial blood gas analysis reveals a pH of $7.47$, a $\text{PaCO}_2$ of $31\text{ mm Hg}$, and a $\text{PaO}_2$ of $54\text{ mm Hg}$. A portable anteroposterior chest radiograph demonstrates thickening of the bronchial walls (peribronchial cuffing), prominent interlobular septa, and loss of distinct margins of the hilar vessels. Both hemidiaphragms possess a normal, domed contour.

Which of the following is the most appropriate initial intervention for this patient's acute respiratory failure?

A 68-year-old man with a history of severe chronic obstructive pulmonary disease (COPD) presents to the emergency department with worsening dyspnea, increased sputum purulence, and lethargy. Arterial blood gas analysis indicates acute-on-chronic hypercapnic respiratory failure. Arrange the following respiratory support interventions in the most appropriate sequential order of clinical escalation, from initial first-line management to the most advanced long-term support.

A $26$-year-old man is evaluated in the emergency department for severe shortness of breath. He has a history of poorly controlled persistent asthma. Over the past two days, he has been using his albuterol inhaler every hour with minimal relief. On initial presentation, he was in severe respiratory distress with a respiratory rate of $34/\text{min}$, prominent accessory muscle use, and minimal air entry bilaterally. He was treated aggressively with supplemental oxygen, intravenous methylprednisolone, intravenous magnesium sulfate, and continuous nebulized albuterol.

Two hours later, the patient reports feeling significantly better and is breathing more comfortably. His temperature is $37.1^\circ\text{C}$ ($98.8^\circ\text{F}$), blood pressure is $122/76\text{ mm Hg}$, pulse is $112/\text{min}$, and respiratory rate is $20/\text{min}$. Pulse oximetry is $96\%$ on a $40\%$ Venturi mask. Physical examination shows no accessory muscle use, no jugular venous distention, and pulmonary auscultation reveals good bilateral air entry with mild end-expiratory wheezing.

Arterial blood gas and serum chemistry results are as follows:

Which of the following is the most appropriate next step in management?

A 62-year-old woman is brought to the emergency department due to sudden onset of severe shortness of breath and lightheadedness. She underwent a right total hip arthroplasty 10 days ago. Her temperature is 37.1°C (98.8°F), blood pressure is 76/48 mm Hg, pulse is 128/min, and respirations are 28/min. Pulse oximetry shows 87% on room air. Physical examination reveals a patient in severe respiratory distress. The jugular venous pressure is estimated at 13 cm H2O. Auscultation of the lungs reveals clear breath sounds bilaterally. Cardiac auscultation reveals a regular tachycardia and a prominent P2, but no murmurs or gallops. The right lower extremity is mildly swollen and tender to palpation compared to the left. Which of the following is the most appropriate next step in the management of this patient?

Paramedics transport a 70-year-old male with a known history of severe chronic obstructive pulmonary disease to the acute care bay. His wife activated emergency services after noting a two-day history of progressively darkening sputum and profoundly labored breathing. Triage assessment reveals an oxygen saturation of 85% on ambient air, though the patient remains fully awake, interactive, and able to answer questions in short phrases. Assume his clinical trajectory over the subsequent week encompasses initial stabilization, progressive decompensation requiring maximal life support, and eventual recovery. Arrange the following clinical interventions in the appropriate chronological sequence of standard care.