Critical Care Practice Questions

Q: Which of the following is true regarding Acute Respiratory Distress Syndrome (ARDS)?

Lung compliance is decreased. Explanation: **Acute Respiratory Distress Syndrome (ARDS)** is characterized by diffuse alveolar damage leading to increased permeability of the alveolar-capillary membrane. 1. **Why Option B is Correct:** In ARDS, the alveoli are filled with protein-rich edema fluid and inflammatory debris, and there is a significant loss of functional surfactant [1]. This leads to alveolar collapse (atelectasis) and makes the lungs "stiff." Therefore, **lung compliance is markedly decreased**, requiring higher pressures to achieve the same tidal volume (often referred to as "Baby Lung" physiology) [1]. 2. **Why Other Options are Incorrect:** * **Option A:** ARDS typically causes **Type 1 Respiratory Failure** (Hypoxemic) [2]. While $CO_2$ retention can occur in late stages or due to protective lung ventilation strategies (permissive hypercapnia), the hallmark is profound hypoxemia due to right-to-left shunting [2]. * **Option C:** The **diffusion capacity (DLCO) is decreased**, not increased. The accumulation of fluid and the formation of hyaline membranes thicken the blood-gas barrier, severely impairing gas exchange. **High-Yield Clinical Pearls for NEET-PG:** * **Berlin Criteria:** Acute onset (within 1 week), bilateral opacities on imaging not fully explained by effusions/collapse, and respiratory failure not fully explained by heart failure (PCWP < 18 mmHg) [1]. * **Severity:** Based on $PaO_2/FiO_2$ ratio: Mild (201–300), Moderate (101–200), Severe (≤ 100). * **Management:** The mainstay is **Low Tidal Volume Ventilation** (6 mL/kg of predicted body weight) to prevent volutrauma and **Prone Positioning** (for at least 16 hours/day in severe cases) to improve V/Q matching.

Q: Which of the following is not a component of qSOFA score?

LDH-Lactate dehydrogenase. ***LDH-Lactate dehydrogenase*** - The **quick Sequential Organ Failure Assessment (qSOFA) score** is a rapid bedside tool used to identify adult patients with suspected infection who are at high risk for poor outcomes, but it does not include laboratory markers like LDH. - qSOFA only includes three simple, readily available clinical criteria (respiratory rate, mental status, and systolic BP), therefore **LDH** is not a component. *Respiratory rate >22* - A **respiratory rate of 22 breaths per minute (or higher)** is one of the three components of the qSOFA score (a score of 1 point is given if RR ≥ 22) [1]. - This parameter indicates a potential compensatory mechanism for **metabolic acidosis** or severe underlying respiratory compromise due to infection. *Altered mental status* - **Altered mental status** (Glasgow Coma Scale score < 15 or any change from baseline) is a key component of the qSOFA score (1 point) [1]. - This reflects neurological **end-organ dysfunction** secondary to systemic inflammation and hypoperfusion (sepsis-associated encephalopathy). *Systolic blood pressure < 100 mmHg* - A systolic blood pressure (SBP) **less than 100 mmHg** is the third component of the qSOFA score (1 point) [1]. - This criterion indicates **hemodynamic compromise** and potential **shock**, reflecting severe circulatory dysfunction associated with sepsis.

Q: Which of the following is seen in all kinds of shock?

Reduced tissue perfusion. ***Reduced tissue perfusion*** - **Shock** is fundamentally defined as a state of cellular and tissue hypoxia due to reduced oxygen delivery, which results from inadequate or ineffective **tissue perfusion** [1]. - In all forms (hypovolemic, cardiogenic, distributive, and obstructive), the core pathophysiological defect is the inability to meet the metabolic demands of the tissues, hence **reduced tissue perfusion** is a universal finding [1], [2]. *Increased peripheral resistance*- This finding is characteristic of **compensatory shock** (e.g., early hypovolemic or cardiogenic) as part of the sympathetic response to maintain mean arterial pressure. - It is *not* seen in **distributive shock** (like septic or anaphylactic shock), which is characterized by profound **vasodilation** and thus marked *decreased* peripheral resistance [2]. *Decreased respiratory rate*- A decreased respiratory rate is *not* characteristic of shock; rather, **metabolic acidosis** (due to anaerobic metabolism) typically stimulates the respiratory center, leading to **compensatory tachypnea** (increased rate). - A decreased respiratory rate might only be seen if shock is severe and complicated by **CNS depression** from drugs or profound decompensation. *Cold clammy skin*- **Cold, clammy skin** is the classic presentation of **hypoperfusion** combined with sympathetic-driven peripheral **vasoconstriction**, typically seen in *hypovolemic* and *cardiogenic* shock. - In contrast, **distributive shock** (especially **septic shock**) presents with **warm, flushed skin** due to widespread peripheral vasodilation and increased cardiac output (hyperdynamic state).

Q: A 20-year-old female diagnosed with septic shock presents with a blood pressure of 58/30 mmHg. After receiving 3 liters of crystalloid fluid, her mean arterial pressure (MAP) remains 58 mmHg. What is the next best step in management?

Start noradrenaline. ***Start noradrenaline*** - **Noradrenaline (Norepinephrine)** is the preferred first-line vasopressor in **septic shock** to achieve a target Mean Arterial Pressure (MAP) of $\ge 65$ mmHg, especially when fluid resuscitation (3L of crystalloids given) is inadequate [1]. - It primarily acts as an $\alpha$-agonist, causing significant **vasoconstriction** which increases systemic vascular resistance (SVR) and improves blood pressure. ***Start dopamine*** - Dopamine is considered a second-line agent due to its potential to cause more **tachyarrhythmias** compared to noradrenaline. - It is often reserved for patients with a low risk of tachyarrhythmias or relative **bradycardia** in addition to hypotension. ***Repeat crystalloid fluid*** - The current fluid challenge (3L) is substantial; administering more fluid without a pressor in refractory shock can lead to detrimental effects like **pulmonary edema** and fluid overload, which has diminishing returns on MAP [1]. - The patient's persistent hypotension (MAP 58 mmHg) despite significant fluid resuscitation indicates inadequate peripheral vascular tone (**vasoplegia**), requiring immediate vasopressor support [1]. ***Start vasopressin*** - **Vasopressin** is generally added as a second-line agent to noradrenaline (**vasopressor weaning**) to potentially reduce the dose of noradrenaline needed. - It is not recommended as the initial monotherapy for hypotension in septic shock because it lacks the potent $\alpha$-agonist effect of noradrenaline.

Q: In a septic shock patient who remains hypotensive despite adequate fluid resuscitation, what would be the next drug of choice?

Noradrenaline. ***Noradrenaline*** - **Noradrenaline (Norepinephrine)** is the preferred first-line vasopressor for septic shock, recommended to target a mean arterial pressure (MAP) of at least **65 mmHg** [1]. - It is the vasoconstrictor with the most potent **alpha-1 adrenergic agonist effects**, effectively raising systemic vascular resistance (SVR) and blood pressure while having less tachycardia compared to adrenaline. ***Adrenaline*** - **Adrenaline (Epinephrine)** is typically a second-line agent, added when noradrenaline alone is insufficient, due to its mixed alpha and potent **beta-1 effects** (which can increase heart rate and the risk of arrhythmias). - Its use as a first-line agent is generally reserved for situations like **anaphylactic shock** or severe cardiogenic shock, not routine septic shock management. ***Dopamine*** - **Dopamine** is no longer recommended as the primary vasopressor in septic shock because it is associated with a higher incidence of **tachyarrhythmias** compared to noradrenaline. - It may be considered only in highly selected patients with a low risk of tachyarrhythmias and **absolute or relative bradycardia**. ***Hydrocortisone*** - **Hydrocortisone** (low-dose corticosteroids) is indicated only if the patient remains hypotensive despite adequate fluid resuscitation and **high-dose vasopressor therapy** (e.g., noradrenaline and likely a second agent like vasopressin or adrenaline). - This treatment addresses potential **critical illness-related corticosteroid insufficiency (CIRCI)**, but it is not the immediate next step after initial fluid failure.

Q: A 65-year-old alcoholic is admitted to the ICU with diagnosis of acute pancreatitis. After 48 hours he is unconscious and has the following findings: $\mathrm{sPO}_{2}=$ $60 \%, \mathrm{pO}_{2}=60 \mathrm{~mm} \mathrm{Hg}, \mathrm{pCO}_{2}=30 \mathrm{~mm} \mathrm{Hg}$ and $\mathrm{HR}=$ 120 bpm . CXR was performed. Diagnosis is?

Shock lung. ***Shock lung*** - The rapid progression to severe hypoxemia (sPO2 60%, pO2 60 mmHg), tachycardia, and the CXR findings of **bilateral diffuse infiltrates** in a patient with severe pancreatitis is highly suggestive of **Acute Respiratory Distress Syndrome (ARDS)**, which is colloquially known as "shock lung". - **Acute pancreatitis** is a common cause of ARDS due to the systemic inflammatory response leading to increased pulmonary vascular permeability and non-cardiogenic pulmonary edema. *Mendelson syndrome* - This syndrome refers to **chemical pneumonitis** caused by aspiration of gastric contents, typically during anesthesia or in patients with impaired consciousness. - While aspiration is a concern in an unconscious patient, the diffuse, widespread infiltrates seen on CXR and the context of severe pancreatitis point more strongly to ARDS. *Nosocomial pneumonia* - Nosocomial pneumonia is an infection acquired in a hospital setting, often characterized by **new onset fever, purulent sputum, and new infiltrate on chest X-ray**. - While possible in an ICU patient, the rapid deterioration, severe hypoxemia, and acute onset after 48 hours of admission with acute pancreatitis are more classic for ARDS than typical nosocomial pneumonia. *Sympathetic pleural effusion* - **Sympathetic pleural effusions** can occur in acute pancreatitis, particularly on the left side, due to localized inflammation. - However, the chest X-ray shows **diffuse bilateral parenchymal infiltrates** rather than predominant pleural fluid, and the severe hypoxemia is indicative of significant lung tissue involvement, not just an effusion.

Question 1

A 40-year-old woman with a clinical suspicion of sepsis develops moderate hemoptysis one hour after a procedure. She has sinus tachycardia and clear lung fields. She has received IV fluids, blood cultures have been drawn, she is on antibiotics, and subcutaneous heparin for thromboembolic prophylaxis. A CXR has been performed. What is the next best step in management?

Accepted Answer

Withdraw the catheter

Answer

Perform an urgent echocardiogram

Answer

Administer protamine sulfate

Answer

Start inotropic agents

Question 2

When evaluating an arterial blood gas (ABG) from a client with a subdural hematoma, the nurse notes the PaCO2 is 30 mm Hg. Which of the following responses best describes this finding?

Accepted Answer

Appropriate; lowering carbon dioxide (CO2) reduces intracranial pressure (ICP).

Answer

Emergent; the client is poorly oxygenated.

Answer

Normal.

Answer

Significant; the client has alveolar hypoventilation.

Question 3

In which of the following conditions is a rapid reduction of blood pressure indicated?

Accepted Answer

Hypertensive encephalopathy

Answer

Cerebral infarct

Answer

Myocardial infarction

Answer

Any patient with hypertension

Question 4

Which of the following is true regarding Acute Respiratory Distress Syndrome (ARDS)?

Accepted Answer

Lung compliance is decreased

Answer

Type 2 respiratory failure

Answer

Increased diffusion capacity of the lungs

Answer

None of the above

Question 5

Which of the following describes the features of neurogenic shock?

Accepted Answer

Decreased peripheral resistance and decreased cardiac output

Answer

Increased peripheral resistance and decreased cardiac output

Answer

Increased venous return and increased cardiac output

Answer

Venoconstriction and decreased cardiac output

Question 6

Which of the following is not a component of qSOFA score?

Accepted Answer

LDH-Lactate dehydrogenase

Answer

Systolic blood pressure < 100 mmHg

Answer

Respiratory rate >22

Answer

Altered mental status

Question 7

Which of the following is seen in all kinds of shock?

Accepted Answer

Reduced tissue perfusion

Answer

Increased peripheral resistance

Answer

Cold clammy skin

Answer

Decreased respiratory rate

Question 8

A 20-year-old female diagnosed with septic shock presents with a blood pressure of 58/30 mmHg. After receiving 3 liters of crystalloid fluid, her mean arterial pressure (MAP) remains 58 mmHg. What is the next best step in management?

Accepted Answer

Start noradrenaline

Answer

Start vasopressin

Answer

Start dopamine

Answer

Repeat crystalloid fluid

Question 9

In a septic shock patient who remains hypotensive despite adequate fluid resuscitation, what would be the next drug of choice?

Accepted Answer

Noradrenaline

Answer

Adrenaline

Answer

Dopamine

Answer

Hydrocortisone

Question 10

A 65-year-old alcoholic is admitted to the ICU with diagnosis of acute pancreatitis. After 48 hours he is unconscious and has the following findings: $\mathrm{sPO}_{2}=$ $60 \%, \mathrm{pO}_{2}=60 \mathrm{~mm} \mathrm{Hg}, \mathrm{pCO}_{2}=30 \mathrm{~mm} \mathrm{Hg}$ and $\mathrm{HR}=$ 120 bpm . CXR was performed. Diagnosis is?

Accepted Answer

Shock lung

Answer

Mendelson syndrome

Answer

Nosocomial pneumonia

Answer

Sympathetic pleural effusion

Critical Care — MCQs

Critical Care — MCQs

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