Critical Care Practice Questions

Q: Which of the following is NOT an evidence-based recommended therapy for the management of acute respiratory distress syndrome?

Inhaled nitric oxide. **Explanation:** The management of Acute Respiratory Distress Syndrome (ARDS) focuses on "lung-protective" strategies and improving oxygenation without causing further injury. **Why Inhaled Nitric Oxide (iNO) is the correct answer:** While iNO is a potent pulmonary vasodilator that can transiently improve oxygenation by reducing ventilation-perfusion (V/Q) mismatch [1], large clinical trials and meta-analyses have shown that it **does not improve mortality** in ARDS. Furthermore, it is associated with an increased risk of renal impairment. Therefore, it is not recommended for routine use and is considered only as a "rescue therapy" for refractory hypoxemia. **Analysis of incorrect options:** * **Low Tidal Volume (6 mL/kg PBW):** This is the cornerstone of ARDS management (ARDSNet protocol). It prevents **volutrauma** and barotrauma, significantly reducing mortality [1]. * **Minimize Left Atrial Filling Pressures:** A "conservative fluid strategy" (FACTT trial) is recommended. By maintaining lower filling pressures (CVP <4 mmHg or PAOP <8 mmHg), clinicians can reduce pulmonary edema and improve lung function without compromising organ perfusion. * **Prone Positioning:** For patients with severe ARDS (PaO2/FiO2 <150), prone positioning for at least 16 hours a day (PROSEVA trial) significantly reduces mortality by improving recruitment and V/Q matching [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Berlin Definition of ARDS:** Acute onset (<1 week), bilateral opacities on imaging, and respiratory failure not fully explained by heart failure (PaO2/FiO2 ratio <300) [1]. * **Neuromuscular Blockade (Cisatracurium):** May be used in early severe ARDS to improve patient-ventilator synchrony. * **Target SpO2:** 88–95% is generally acceptable to avoid oxygen toxicity.

Q: Water intoxication occurs in all of the following conditions except?

Heroin abuse. **Explanation:** Water intoxication refers to **dilutional hyponatremia** caused by an excessive intake or absorption of free water relative to sodium [1]. **Why Heroin abuse is the correct answer:** Heroin abuse is typically associated with **Non-Cardiogenic Pulmonary Edema (NCPE)** and nephrotoxicity (FSGS), but it does not directly cause water intoxication [2]. While some drugs like MDMA (Ecstasy) cause hyponatremia via SIADH and excessive thirst, Heroin does not have a recognized clinical association with acute water intoxication. **Why the other options are incorrect:** * **TURP Syndrome:** During Transurethral Resection of the Prostate, large volumes of non-conductive irrigation fluids (like Glycine or Sorbitol) are used. Systemic absorption of these hypotonic fluids leads to dilutional hyponatremia and water intoxication [1]. * **Enema for colonic wash:** Repeated use of tap water enemas, especially in children or patients with megacolon (Hirschsprung’s disease), allows for significant transmucosal absorption of free water into the circulation, leading to hyponatremia. * **Gastric lavage:** If large volumes of plain water are used for gastric lavage (instead of normal saline), the water can be absorbed through the gastric and intestinal mucosa, precipitating acute water intoxication. **High-Yield Clinical Pearls for NEET-PG:** * **TURP Syndrome Triad:** Hypertension (early), Bradycardia, and Mental status changes (due to hyponatremia). * **Psychogenic Polydipsia:** A common psychiatric cause of water intoxication where the patient drinks water exceeding the kidney's excretory capacity (usually >12L/day) [1]. * **Management:** Acute symptomatic water intoxication is a medical emergency treated with **3% Hypertonic Saline** to prevent cerebral edema, while avoiding rapid correction to prevent **Osmotic Demyelination Syndrome (ODS).**

Q: All of the following are used for the graduation of coma using the Glasgow Coma Scale, except?

Heart rate. The **Glasgow Coma Scale (GCS)** is a standardized clinical tool used to assess the level of consciousness and the severity of brain injury [1], [2]. It is based on three objective clinical parameters: **Eye opening (E)**, **Verbal response (V)**, and **Motor response (M)**. ### Explanation of Options: * **Heart Rate (Correct Answer):** Heart rate is a vital sign, not a component of the GCS [2]. While changes in heart rate (e.g., bradycardia in Cushing’s triad) can indicate increased intracranial pressure, it is not used to calculate the GCS score. * **Eye Opening (A):** Scored from 1 to 4. It assesses the brainstem's reticular activating system. * **Verbal Response (C):** Scored from 1 to 5. It assesses central nervous system integration and orientation. * **Motor Response (B):** Scored from 1 to 6. It is the most significant predictor of clinical outcome. ### High-Yield Clinical Pearls for NEET-PG: * **Score Range:** The total GCS score ranges from a **minimum of 3** (deep coma or death) to a **maximum of 15** (fully awake). There is no score of 0. * **Severity Grading:** * **Mild:** 13–15 [1] * **Moderate:** 9–12 [1] * **Severe (Coma):** ≤ 8 [1] * **Mnemonic:** *"GCS of 8, Intubate"* — Patients with a score of 8 or less usually require airway protection. * **Modified GCS:** For intubated patients, the verbal score is replaced with 'T' (e.g., E4VTM6). * **GCS-P:** A newer variant that includes **Pupillary reactivity** to better predict prognosis in neurocritical care.

Q: What is the commonest cause of death in ARDS?

Non-pulmonary organ failure. ### Explanation **1. Why "Non-pulmonary organ failure" is correct:** While ARDS is primarily a respiratory syndrome characterized by non-cardiogenic pulmonary edema and refractory hypoxemia, patients rarely die from the lung injury itself [1]. Modern mechanical ventilation strategies (like Lung Protective Ventilation) have significantly reduced deaths from acute respiratory failure. Instead, the systemic inflammatory response syndrome (SIRS) triggered by the underlying cause of ARDS (e.g., sepsis) leads to **Multiple Organ Dysfunction Syndrome (MODS)**. Most patients succumb to secondary complications, primarily **sepsis** and **multi-organ failure** (renal, hepatic, or cardiovascular), rather than an inability to oxygenate [1]. **2. Why the other options are incorrect:** * **Hypoxemia & Respiratory failure:** Although these are the hallmark clinical features of ARDS, they are usually manageable with advanced ventilatory support (PEEP, prone positioning, or ECMO). Death directly attributable to "hypoxic arrest" or isolated respiratory failure occurs in less than 15-20% of cases [1]. * **Hypotension:** While common in the setting of septic shock or high PEEP (which decreases venous return), hypotension is typically a component of the broader multi-organ failure spectrum rather than the primary cause of death. **3. NEET-PG High-Yield Pearls:** * **Commonest cause of ARDS:** Sepsis (specifically Gram-negative sepsis). * **Pathological hallmark:** Diffuse Alveolar Damage (DAD). * **Berlin Criteria:** Acute onset (<1 week), bilateral opacities on imaging, $PaO_2/FiO_2$ ratio <300 mmHg, and exclusion of cardiac failure (PCWP <18 mmHg) [1]. * **Gold Standard Management:** Low Tidal Volume Ventilation (6 mL/kg of predicted body weight) to prevent Volutrauma/Biotrauma [1]. * **Mortality:** Overall mortality remains high (approx. 30-40%), with age and non-pulmonary organ dysfunction being the strongest predictors of death [1].

Q: Which of the following is true about anaphylactic shock?

Raised pulse rate. **Explanation:** Anaphylactic shock is a type of **distributive shock** caused by a severe Type I hypersensitivity reaction. The release of inflammatory mediators (like histamine) leads to massive systemic vasodilation and increased capillary permeability [1]. **1. Why "Raised pulse rate" is correct:** In anaphylaxis, the sudden drop in systemic vascular resistance (SVR) leads to profound hypotension. To maintain tissue perfusion and cardiac output, the body initiates a **compensatory baroreceptor reflex**, resulting in **tachycardia** (raised pulse rate). This is a hallmark of most forms of shock, including distributive shock. **2. Why the other options are incorrect:** * **Peripheral vasoconstriction:** Anaphylaxis causes massive **vasodilation** (not constriction) due to the effect of histamine on H1 and H2 receptors [1]. This leads to the characteristic "warm shock" early on. * **Raised blood pressure:** By definition, shock involves **hypotension** (low blood pressure) due to decreased SVR and relative hypovolemia from fluid leaking into the extravascular space [1]. * **Raised cardiac output:** While the heart rate increases, the **total cardiac output (CO) typically decreases** in anaphylactic shock. This is due to "venous pooling" and plasma leakage, which reduces venous return (preload) to the heart. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** Adrenaline (Epinephrine) 1:1000 concentration, **0.5 mg IM** (Intramuscular) in the anterolateral thigh [2]. * **Hemodynamic Profile:** Low SVR (Systemic Vascular Resistance), Low PCWP (Pulmonary Capillary Wedge Pressure), and Low CO (Cardiac Output). * **Biphasic Reaction:** Symptoms can recur 1–72 hours after initial resolution; hence, patients should be monitored for at least 4–6 hours [2]. * **Kounis Syndrome:** Anaphylaxis-induced acute coronary syndrome (vasospastic angina).

Q: Which type of shock is characterized by high cardiac output and low peripheral resistance?

Septic shock. **Explanation:** The correct answer is **Septic Shock**. **1. Why Septic Shock is correct:** Septic shock is the classic example of **Distributive Shock**. The underlying pathophysiology involves a systemic inflammatory response to infection, leading to the release of inflammatory mediators (like Nitric Oxide). This causes massive **peripheral vasodilation**, which significantly decreases **Systemic Vascular Resistance (SVR)** [2]. To compensate for the drop in blood pressure and meet metabolic demands, the heart increases its rate and stroke volume, resulting in a **high Cardiac Output (CO)** [1]. This is often referred to as "Warm Shock" because the skin remains warm and flushed due to vasodilation [2]. **2. Why the other options are incorrect:** * **Hypovolemic Shock:** Caused by loss of blood or fluid volume. This leads to low CO (due to low preload) and a compensatory **increase in SVR** (vasoconstriction) to maintain BP. * **Cardiogenic Shock:** Caused by primary pump failure (e.g., MI) [3]. It is characterized by **low CO** and a compensatory **increase in SVR**. * **Anaphylactic Shock:** While also a type of distributive shock with low SVR [3], the question specifically targets the classic hemodynamic profile of high CO/low SVR most commonly associated with early (hyperdynamic) sepsis in clinical exams. **3. NEET-PG High-Yield Pearls:** * **Hemodynamic Rule:** In almost all shocks, SVR is high (compensatory), **EXCEPT** in Distributive shocks (Sepsis, Anaphylaxis, Neurogenic), where SVR is low [4]. * **PCWP (Pulmonary Capillary Wedge Pressure):** It is **high** in Cardiogenic shock (fluid backs up) but **low** in Hypovolemic and Septic shock. * **Mixed Venous Oxygen Saturation ($SvO_2$):** It is typically **increased** in Septic shock (due to high flow and impaired tissue extraction) but **decreased** in Cardiogenic and Hypovolemic shock.

Question 1

Septic shock is most frequently triggered by?

Accepted Answer

Bacterial infections

Answer

Mixed infections

Answer

Fungal infections

Answer

Viral infections

Question 2

Which of the following is NOT an evidence-based recommended therapy for the management of acute respiratory distress syndrome?

Accepted Answer

Inhaled nitric oxide

Answer

Low tidal volume mechanical ventilation

Answer

Minimize left atrial filling pressures

Answer

Prone positioning

Question 3

Water intoxication occurs in all of the following conditions except?

Accepted Answer

Heroin abuse

Answer

TURP syndrome

Answer

Enema for colonic wash

Answer

Gastric lavage

Question 4

Which of the following is not an exclusion for the diagnosis of brainstem death?

Accepted Answer

Patient with severe head injury

Answer

Patient under the effect of drug overdose

Answer

Core body temperature below 35 degrees Celsius

Answer

Patient suffering from severe metabolic or endocrine disturbance

Question 5

All of the following are used for the graduation of coma using the Glasgow Coma Scale, except?

Accepted Answer

Heart rate

Answer

Eye opening

Answer

Motor response

Answer

Verbal response

Question 6

What is the commonest cause of death in ARDS?

Accepted Answer

Non-pulmonary organ failure

Answer

Hypoxemia

Answer

Hypotension

Answer

Respiratory failure

Question 7

With reference to the optimal management of patients with sepsis in the intensive care unit, all of the following interventions are evidence-based except?

Accepted Answer

Intensive blood glucose monitoring and prevention of hyperglycemia improves survival in critically ill patients.

Answer

Low tidal volume during assisted ventilation prevents acute lung injury.

Answer

For outcome of goal-oriented management of sepsis patients, monitoring of central venous pressure, hourly urine output and blood pressure is adequate.

Answer

The use of drotrecogin alpha is restricted to severely ill patients with APACHE score 25.

Question 8

Which of the following is true about anaphylactic shock?

Accepted Answer

Raised pulse rate

Answer

Peripheral vasoconstriction

Answer

Raised blood pressure

Answer

Raised cardiac output

Question 9

A patient in the ICU has normal pulmonary artery pressure, low systemic peripheral resistance, low cardiac index, and arterial PO2 of 93 mmHg. What are the diagnostic possibilities?

Accepted Answer

Cardiac tamponade

Answer

Cardiogenic shock

Answer

Septic shock

Answer

Acute tubular necrosis

Question 10

Which type of shock is characterized by high cardiac output and low peripheral resistance?

Accepted Answer

Septic shock

Answer

Hypovolemic shock

Answer

Cardiogenic shock

Answer

Anaphylactic Shock

Critical Care — MCQs

Critical Care — MCQs

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