Critical Care Practice Questions

Q: A 22 year old male patient sustained a burn and presented to the emergency department, on examination nasal hair were singed, on blood investigation Carboxy Hb was raised to 18.5%, and oxygen saturation was 81%, what is the next best step?

Intubation. ***Intubation*** - The patient presents with **singed nasal hair**, which is a significant clinical indicator of **upper airway inhalation injury**, necessitating early airway protection. - A **Carboxyhemoglobin (COHb) level >10-15%** associated with inhalation injury, combined with clinical signs of airway compromise, mandates **prophylactic endotracheal intubation** to prevent airway obstruction due to evolving edema. *100% O2 with NVA* - While **100% oxygen** is the definitive treatment for **carbon monoxide poisoning** to shorten the half-life of COHb, it does not secure the airway in a patient with impending respiratory obstruction from inhalation injury. - This intervention is insufficient as the primary management step when there is an immediate threat to airway patency evidenced by **singed nasal hair** and associated burn stigmata. *Fluid resuscitation according to parkland formula* - Although aggressive **fluid resuscitation** is vital for burn management to prevent hypovolemic shock, it is secondary to **Airway (A)** management in the A-B-C priority framework. - Ensuring a patent airway takes precedence over initiating the **Parkland formula**, even though fluid resuscitation will be required shortly thereafter. *Tracheostomy* - A **tracheostomy** is an invasive surgical procedure typically reserved for cases where **endotracheal intubation** fails or is impossible due to severe upper airway anatomy distortion. - It is not the first-line intervention for immediate airway management in a patient presenting to the emergency department; **orotracheal intubation** is the standard for rapid airway control.

Q: What is the suspected acid-base disorder based on the ABG analysis? pH 7.45 PaCO2 28 mmHg HCO3 20mEq/L

Compensated respiratory alkalosis. ***Compensated respiratory alkalosis*** - The arterial blood gas (ABG) shows a pH at the high end of normal (7.45), representing **respiratory alkalosis** due to the low **PaCO2** (28 mmHg). - The decreased **HCO3** (20 mEq/L) indicates renal **metabolic compensation**, which has brought the pH back toward a normal range. *Compensated Respiratory acidosis* - Respiratory acidosis would present with a primary increase in **PaCO2** (>45 mmHg). - Compensation for respiratory acidosis involves an increase in **HCO3** (bicarbonate retention), which is the opposite of the finding in this patient. *Uncompensated respiratory acidosis* - This would demonstrate an **acidemic** pH ( 7.45) rather than the normal range seen here. - The **HCO3** would be within the normal reference range, signifying a lack of renal **metabolic compensation**.

Q: Which of the following is the best parameter for monitoring septic shock?

Serum lactate. ### Explanation The correct answer is **Serum lactate**. **1. Why Serum Lactate is the Best Parameter:** Septic shock is defined by cellular dysoxygenation and metabolic abnormalities [1]. Serum lactate serves as a surrogate marker for **tissue perfusion and anaerobic metabolism**. In shock, inadequate oxygen delivery to tissues leads to anaerobic glycolysis, resulting in elevated lactate levels. * **Lactate Clearance:** Monitoring the trend of lactate (lactate clearance) is a superior prognostic indicator compared to a single value. A decrease in lactate levels indicates successful resuscitation and improved microcirculation, making it the gold standard for monitoring the adequacy of treatment in septic shock. **2. Why Other Options are Incorrect:** * **Central Venous Pressure (CVP):** Formerly part of "Early Goal-Directed Therapy," CVP is a measure of right atrial pressure [1]. It is a poor predictor of fluid responsiveness and does not reflect tissue-level oxygenation. * **Vasopressor Requirement:** While it indicates the severity of vasomotor tone loss, it does not directly measure whether tissues are being adequately oxygenated. * **Urine Output:** Although a vital sign of end-organ perfusion, it can be influenced by pre-existing renal disease, diuretics, or stress-induced hormonal changes, making it less sensitive than lactate for real-time metabolic monitoring [1]. **3. High-Yield Clinical Pearls for NEET-PG:** * **Sepsis-3 Definition:** Septic shock is clinically identified by the requirement of vasopressors to maintain a **MAP ≥ 65 mmHg** AND a **serum lactate level > 2 mmol/L** despite adequate fluid resuscitation [1]. * **qSOFA Score:** Includes Respiratory rate ≥ 22/min, Altered mentation (GCS < 15), and Systolic BP ≤ 100 mmHg. * **Target:** The Surviving Sepsis Campaign recommends "guiding resuscitation to normalize lactate" in patients with elevated levels.

Q: All of the following are indications for non-invasive ventilation except?

GCS < 8. Explanation: Non-invasive ventilation (NIV) refers to the delivery of ventilatory support without the use of an invasive artificial airway (endotracheal tube or tracheostomy). **Why GCS < 8 is the correct answer:** A **Glasgow Coma Scale (GCS) < 8** is a classic **contraindication** for NIV. For NIV to be safe and effective, a patient must be able to protect their own airway and clear secretions [1]. Patients with a GCS < 8 are typically unable to maintain airway patency, have an absent gag reflex, and are at high risk for aspiration. Such patients require **invasive mechanical ventilation** (intubation) for airway protection. **Analysis of other options:** * **Conscious and cooperative patient:** This is a primary **requirement** for NIV [1]. Since the interface (mask) can be uncomfortable and requires patient synchrony with the machine, a cooperative patient is the ideal candidate. * **COPD:** Acute exacerbation of COPD with respiratory acidosis (pH 7.25–7.35) is the **strongest evidence-based indication** for NIV [2]. It reduces the work of breathing and the need for intubation. * **ARDS:** NIV can be used in select cases of mild-to-moderate ARDS (especially in immunocompromised patients to avoid VAP), though it must be used with caution as failure rates are higher compared to COPD [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Absolute Contraindications for NIV:** Respiratory arrest, hemodynamic instability (shock), facial trauma/burns, high aspiration risk, and bowel obstruction. * **Golden Rule:** "GCS less than 8, we intubate." * **Best Success Rates:** NIV shows the best outcomes in **COPD exacerbations** and **Acute Cardiogenic Pulmonary Edema** [1].

Q: A patient presents to the emergency room with a very weak pulse following a myocardial infarction. What is the most likely underlying condition?

Late-stage (decompensated) shock, representing the most life-threatening stage.. **Explanation:** The clinical presentation of a weak pulse following a myocardial infarction (MI) indicates **Cardiogenic Shock**, a state of systemic hypoperfusion due to pump failure [1]. **1. Why Option D is Correct:** Shock progresses through stages. In **Early (Compensated) Shock**, the body uses homeostatic mechanisms (like tachycardia and peripheral vasoconstriction) to maintain blood pressure and perfusion to vital organs. A **weak or thready pulse** is a hallmark of **Late-stage (Decompensated) Shock** [2]. At this point, compensatory mechanisms fail, leading to a profound drop in cardiac output and systolic blood pressure. This is the most life-threatening stage because it leads to multi-organ dysfunction syndrome (MODS) and irreversible cellular injury if not immediately corrected. **2. Why Other Options are Incorrect:** * **Option A:** A weak pulse after an MI is a "red flag" for cardiogenic shock; discharging the patient would be fatal. * **Option B:** While it correctly identifies decompensated shock, it incorrectly labels it as "least life-threatening." Decompensated shock has a significantly higher mortality rate than the compensated phase. * **Option C:** Early-stage shock is characterized by maintained blood pressure (though the pulse may be rapid). It is the *least* life-threatening stage because it is still reversible. **Clinical Pearls for NEET-PG:** * **Definition of Cardiogenic Shock:** SBP 30 mins or requiring vasopressors, with a Cardiac Index 15 mmHg [1]. * **Pulse Pressure:** Narrowing pulse pressure is an early sign of shock before the systolic BP drops [2]. * **Management:** The priority in post-MI cardiogenic shock is **revascularization** (PCI/CABG) and potentially mechanical circulatory support (e.g., IABP or Impella).

Q: What complication can arise from rapid infusion of blood?

Pulmonary edema. The correct answer is **Pulmonary edema**, specifically referring to **TACO (Transfusion-Associated Circulatory Overload)**. **1. Why Pulmonary Edema is Correct:** Rapid infusion of blood products increases the intravascular volume faster than the cardiovascular system can compensate. This leads to a sudden rise in hydrostatic pressure within the pulmonary capillaries. When this pressure exceeds the oncotic pressure, fluid is forced into the alveolar spaces, resulting in **cardiogenic pulmonary edema**. This is a common and potentially fatal complication, especially in patients with underlying cardiac or renal impairment, or in the elderly and pediatric populations. **2. Analysis of Incorrect Options:** * **Acute left heart failure (A):** While TACO involves left-sided heart strain, "Pulmonary Edema" is the direct, clinical manifestation resulting from the volume overload. In many cases, the heart itself isn't "failing" in the chronic sense; it is simply overwhelmed by the rate of volume administration. * **Ankle edema (B):** This is a sign of chronic right-sided heart failure or systemic volume overload. It takes time for fluid to redistribute to the dependent extremities; rapid infusion causes acute central congestion first. * **Respiratory distress (D):** This is a non-specific symptom. While pulmonary edema causes respiratory distress, the question asks for the specific pathological complication. **3. NEET-PG High-Yield Pearls:** * **TACO vs. TRALI:** TACO presents with hypertension and responds to diuretics. TRALI (Transfusion-Related Acute Lung Injury) is immune-mediated, presents with hypotension and fever, and does *not* respond to diuretics. * **Preventive Measure:** In at-risk patients, blood should be infused slowly (not exceeding 2 mL/kg/hr) and prophylactic furosemide may be considered. * **Clinical Sign:** A rise in **BNP (Brain Natriuretic Peptide)** post-transfusion is highly suggestive of TACO over TRALI.

Q: A 24-year-old man presents in septic shock from an empyema. He is febrile to 103 ounit0000B0F, tachycardic in the 120s, and hypotensive to the 90s. His oxygen saturation is 98% on 2-L oxygen. His white blood cell count is 25,000/mL and creatinine is 0.8 mg/dL. His blood pressure does not respond to fluid administration despite a CVP of 15. Which of the following therapies is indicated in managing this patient?

Norepinephrine. ### Explanation **Correct Answer: D. Norepinephrine** This patient is in **septic shock**, defined by persistent hypotension requiring vasopressors to maintain a Mean Arterial Pressure (MAP) ≥ 65 mmHg and a serum lactate level > 2 mmol/L despite adequate fluid resuscitation. The patient has received fluid boluses (CVP is 15 cmH₂O, indicating adequate preload), yet remains hypotensive. According to the **Surviving Sepsis Campaign guidelines**, **Norepinephrine** is the first-line vasopressor of choice. It acts primarily as an $\alpha$-1 agonist (causing vasoconstriction) with modest $\beta$-1 effects (increasing stroke volume), making it highly effective at increasing MAP with a lower risk of tachyarrhythmias compared to dopamine. **Why other options are incorrect:** * **A. Intubation:** The patient’s oxygen saturation is 98% on minimal support (2L $O_2$). While intubation may be needed later if he develops ARDS or altered mental status, it is not the immediate priority for hemodynamic stabilization. * **B. Recombinant human activated protein C (Drotrecogin alfa):** This was previously used for severe sepsis but was withdrawn from the global market after the PROWESS-SHOCK trial failed to show a mortality benefit. * **C. Epinephrine:** This is generally considered a second-line agent (added to or substituted for norepinephrine) when an additional agent is needed to maintain adequate blood pressure. **NEET-PG Clinical Pearls:** * **Fluid Resuscitation:** The initial target is 30 mL/kg of crystalloid within the first 3 hours. * **Vasopressor of Choice:** Norepinephrine is #1 for Septic, Cardiogenic, and Neurogenic shock. * **Target MAP:** $\geq$ 65 mmHg. * **Inotrope of Choice:** If there is evidence of myocardial dysfunction (low cardiac output) despite adequate MAP, **Dobutamine** is the preferred add-on.

Question 1

A 22 year old male patient sustained a burn and presented to the emergency department, on examination nasal hair were singed, on blood investigation Carboxy Hb was raised to 18.5%, and oxygen saturation was 81%, what is the next best step?

Accepted Answer

Intubation

Answer

100% O2 with NVA

Answer

Fluid resuscitation according to parkland formula

Answer

Tracheostomy

Question 2

What is the suspected acid-base disorder based on the ABG analysis? pH 7.45 PaCO2 28 mmHg HCO3 20mEq/L

Accepted Answer

Compensated respiratory alkalosis

Answer

Compensated Respiratory acidosis

Answer

Uncompensated respiratory acidosis

Answer

Uncompensated Respiratory alkalosis

Question 3

A 42-year-old man undergoes therapeutic hypothermia (target temperature 33°C/91.4°F) following cardiac arrest with return of spontaneous circulation. During the cooling phase, he develops shivering, which increases oxygen consumption and interferes with target temperature achievement. He is already on sedation and neuromuscular blockade is being considered. Evaluate the most appropriate management strategy considering both efficacy and safety.

Accepted Answer

Increase sedation and add surface counter-warming of extremities before neuromuscular blockade

Answer

Administer meperidine alone to reduce shivering threshold

Answer

Abandon therapeutic hypothermia due to complications

Answer

Use only mechanical restraints to prevent movement

Answer

Immediate neuromuscular blockade without additional measures

Question 4

Which of the following is the best parameter for monitoring septic shock?

Accepted Answer

Serum lactate

Answer

Central venous pressure (CVP)

Answer

Vasopressor requirement

Answer

Urine output

Question 5

A 56-year-old man admitted to the ICU in respiratory distress is placed on mechanical ventilation with a tidal volume of 900 mL, a rate of 12 breaths/min, and FiO2 50%. PEEP is 10 cm of water. Medications include subcutaneous heparin and aspirin. He now develops tachycardia and a blood pressure of 70/palpation mm Hg. Cardiac examination reveals multiple premature contractions. His arterial blood gas reveals a PO2 of 40 mm Hg. What is the most likely cause of this condition?

Accepted Answer

Pneumothorax

Answer

Cardiac arrhythmia

Answer

Bronchial secretions

Answer

Myocardial infarction

Question 6

All of the following are indications for non-invasive ventilation except?

Accepted Answer

GCS < 8

Answer

Conscious and cooperative patient

Answer

COPD

Answer

ARDS

Question 7

A patient presents to the emergency room with a very weak pulse following a myocardial infarction. What is the most likely underlying condition?

Accepted Answer

Late-stage (decompensated) shock, representing the most life-threatening stage.

Answer

The weak pulse is unrelated to shock or the myocardial infarction, and the patient can be discharged.

Answer

Late-stage (decompensated) shock, representing the least life-threatening stage.

Answer

Early-stage (compensated) shock, representing the most life-threatening stage.

Question 8

What complication can arise from rapid infusion of blood?

Accepted Answer

Pulmonary edema

Answer

Acute left heart failure

Answer

Ankle edema

Answer

Respiratory distress

Question 9

A 24-year-old man presents in septic shock from an empyema. He is febrile to 103
ounit0000B0F, tachycardic in the 120s, and hypotensive to the 90s. His oxygen saturation is 98% on 2-L oxygen. His white blood cell count is 25,000/mL and creatinine is 0.8 mg/dL. His blood pressure does not respond to fluid administration despite a CVP of 15. Which of the following therapies is indicated in managing this patient?

Accepted Answer

Norepinephrine

Answer

Intubation

Answer

Recombinant human activated protein C

Answer

Epinephrine

Question 10

Critical illness-related corticosteroid insufficiency is seen in which of the following conditions?

Accepted Answer

Septic shock

Answer

Addison's disease

Answer

Acute myocardial infarction

Answer

Cerebrovascular accident

Critical Care — MCQs

Critical Care — MCQs

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