Critical Care Practice Questions

Q: The following are true of Mendelson's syndrome –

Onset of symptoms generally occurs within 30 minutes. ***Onset of symptoms generally occurs within 30 minutes*** - Mendelson's syndrome refers to **chemical pneumonitis** resulting from pulmonary aspiration of sterile gastric contents. - Symptoms like **bronchospasm**, **dyspnea**, and **tachycardia** typically manifest rapidly, often within minutes to 30 minutes post-aspiration. *Steroids have been shown to improve outcome* - **Corticosteroids** are generally **not recommended** for the treatment of Mendelson's syndrome or chemical pneumonitis caused by gastric aspiration. - Their use can potentially increase the risk of **secondary bacterial pneumonia** due to immunosuppression, without significant clinical benefit in improving lung injury. *Critical volume of aspirate is 50 mls* - The critical volume of aspirate associated with Mendelson's syndrome is generally considered to be **25 mL** or **0.3 mL/kg** of gastric contents. - Aspiration of volumes greater than this threshold significantly increases the risk of developing **severe pneumonitis**. *Critical pH of gastric aspirate is 1.5* - The critical pH of gastric aspirate associated with Mendelson's syndrome is generally considered to be **less than 2.5**. - A pH below this value indicates highly acidic gastric contents, which cause **severe chemical burns** to the tracheobronchial tree and lung parenchyma.

Q: Which is the best initial fluid for resuscitation during the shock state:

Crystalloids. ***Crystalloids*** - **Isotonic crystalloids** (e.g., normal saline, lactated Ringer's) are the **first-line fluid of choice** for initial resuscitation in most shock states due to their availability, low cost, and effectiveness in expanding intravascular volume. - They freely distribute into the **interstitial space**, effectively restoring tissue perfusion throughout the body. *Plasma substitutes* - **Plasma substitutes** (e.g., albumin, dextran, gelatins) are **colloids** and are generally **not recommended as first-line** for initial resuscitation due to higher cost and potential side effects compared to crystalloids. - While they can expand intravascular volume effectively, evidence often shows **no significant mortality benefit** over crystalloids in the early phase of shock. *Blood* - **Blood products** (e.g., packed red blood cells) are indicated specifically for **hemorrhagic shock** with significant blood loss to improve oxygen-carrying capacity. - They are **not appropriate for initial resuscitation** in non-hemorrhagic shock states (e.g., septic shock unless anemia is severe) and require cross-matching, which can delay immediate fluid administration. *Colloids* - **Colloids** (including plasma substitutes and synthetic colloids) remain a subject of debate in initial shock resuscitation; while they expand intravascular volume more efficiently than crystalloids, they are **more expensive** and some (e.g., **hydroxyethyl starches**) have been associated with **adverse effects** like acute kidney injury. - They are generally **reserved for specific situations** or when large volumes of crystalloids fail to achieve hemodynamic stability.

Q: What is the treatment for class I hypovolemic shock?

Oral liquids. ***Oral liquids*** - **Class I hemorrhagic shock** involves a **minimal blood loss** (up to 15%) with usually no significant changes in vital signs. - In most cases, patients are **hemodynamically stable** and can compensate for the fluid loss by drinking oral liquids. *IV fluids alone* - While IV fluids are suitable for **more severe classes of shock**, they are generally **not necessary for class I**, where oral rehydration is sufficient. - This option does not reflect the least invasive and appropriate treatment for the mildest form of hypovolemia. *Admission and IV fluids* - **Admission** to a hospital is usually reserved for patients with more severe symptoms or those requiring close monitoring for significant fluid loss [1]. - **IV fluids** are **not typically required** for class I shock as oral intake is preferred [1]. *Blood transfusion* - **Blood transfusions** are indicated in cases of **severe hemorrhage** (typically class III or IV) where there is a substantial loss of red blood cell mass. - It is **never the first-line treatment for class I shock** due to the minimal blood loss and associated risks.

Q: To prevent ventilator associated pneumonia, the most effective and evidence based results are seen with which of the following for critically ill patients:

Oral hygiene procedures plus chlorhexidine. Oral hygiene procedures plus chlorhexidine - **Chlorhexidine** mouthwash, when combined with mechanical oral hygiene, significantly reduces the oral bacterial load, preventing aspiration of pathogenic bacteria into the lungs. - This comprehensive approach is a **gold standard** strategy for VAP prevention in critically ill patients, supported by strong evidence. *Betadine mouthwash* - While Betadine (povidone-iodine) has **antiseptic properties**, its efficacy in preventing VAP is not as well-established or consistently supported by evidence as chlorhexidine. - There are concerns about potential **mucosal irritation** and systemic absorption with prolonged use in critically ill patients. *Powered brushing* - Though powered brushing can provide effective plaque removal, it primarily focuses on **mechanical cleaning** without the added antimicrobial benefits of an antiseptic agent like chlorhexidine. - Its effectiveness alone in preventing VAP has **not been shown to be superior** to comprehensive oral care including antiseptics. *Manual brushing* - Manual brushing is a basic component of oral hygiene but, similar to powered brushing, lacks the **antimicrobial action** necessary to drastically reduce bacterial colonization in critically ill, intubated patients. - It is important for general oral cleanliness but **insufficient on its own** for preventing VAP effectively.

Q: Adverse effects of hypothermia are all except:

Decreased peripheral resistance. ***Decreased peripheral resistance*** - Hypothermia causes **vasoconstriction** in the periphery, which leads to **increased peripheral resistance**, not decreased. - This effect helps redirect blood flow to vital organs during cold exposure. *Cardiac arrhythmias* - Hypothermia significantly increases the risk of **cardiac arrhythmias**, especially **ventricular fibrillation**, as myocardial excitability changes [1]. - The most common ECG changes include a **prolonged PR interval**, **widened QRS complex**, and the presence of **J (Osborn) waves** [2]. *Renal failure* - Severe hypothermia can lead to **acute kidney injury** or **renal failure** due to reduced renal blood flow, direct cellular damage, and rhabdomyolysis [1], [3]. - Decreased kidney function can also impair the excretion of drugs and metabolic waste products. *Reversible coagulopathy* - Hypothermia causes a **reversible coagulopathy** due to impaired platelet function, decreased activity of coagulation factors, and increased fibrinolysis. - This can manifest as increased bleeding tendencies, particularly in trauma patients.

Q: Which of the following is a feature of crush syndrome -

Myoglobinuria. Myoglobinuria - **Myoglobinuria** is a hallmark of crush syndrome, resulting from the massive release of **myoglobin** from damaged muscle cells into the bloodstream [2]. - This excess myoglobin can precipitate in the renal tubules, leading to **acute kidney injury (AKI)** [1]. *Hypophosphatemia* - Crush syndrome typically results in **hyperphosphatemia**, not hypophosphatemia, due to the release of intracellular phosphate from damaged muscular cells. - The elevated phosphate levels contribute to reciprocal **hypocalcemia** through precipitation. *Hypokalemia* - Crush syndrome is characterized by **hyperkalemia**, caused by the release of intracellular potassium from damaged muscle cells. - **Hyperkalemia** is a significant and life-threatening complication due to its potential for cardiac arrhythmias. *Hypercalcemia* - Crush syndrome typically presents with **hypocalcemia** due to the precipitation of calcium with released phosphate and fatty acids. - Initial **hypocalcemia** may later be followed by **hypercalcemia** during the recovery phase, especially in those with renal failure, but hypocalcemia is more acute.

Q: A patient presents with multiple fractures. He develops respiratory distress and dies after few days. CT brain shows petechial hemorrhage. Most likely diagnosis is:

Fat embolism. ***Fat embolism*** - The classic triad of **fat embolism syndrome** includes **respiratory distress**, neurological symptoms (such as **petechial hemorrhages** on CT brain), and petechial rash, often occurring after **multiple fractures** [1]. - The fat emboli, released from the bone marrow following trauma, travel to the lungs and systemic circulation, leading to organ dysfunction [1]. *Hypoxic ischemic encephalopathy* - While respiratory distress can lead to hypoxia, the presence of **petechial hemorrhages** in the brain following fractures is more characteristic of fat embolism [1]. - Hypoxic ischemic encephalopathy typically involves diffuse brain injury due to lack of oxygen and blood flow, without the specific pattern of petechial hemorrhages seen here. *Hemorrhage* - Although trauma can cause hemorrhage, the description of **multiple fractures** followed by **respiratory distress** and **petechial hemorrhage** in the brain points more specifically to fat embolism syndrome [1]. - A primary intracranial hemorrhage would present with acute neurological deficits, and systemic hemorrhage alone would not explain the respiratory distress and specific brain findings without other signs of massive blood loss. *Stroke* - A stroke is generally localized brain damage due to an interruption in blood supply, either ischemic or hemorrhagic. - The combination of **multiple fractures**, subsequent **respiratory distress**, and widespread **petechial hemorrhages** is not typical for a standard stroke but is highly indicative of fat embolism syndrome [1].

Q: Which of the following is not a component of APACHE score

Serum calcium. ***Serum calcium*** - Serum calcium is **not included** as a variable in the Acute Physiology and Chronic Health Evaluation (APACHE) score. - The APACHE score focuses on parameters highly predictive of **mortality risk** in critically ill patients. *Serum sodium* - **Serum sodium** levels are an important component of the APACHE score, as significant abnormalities (both hyponatremia and hypernatremia) reflect severe physiological derangement. - Deviations from normal **sodium** ranges contribute to the overall severity score. *Serum potassium* - **Serum potassium** levels are also a crucial part of the APACHE score, as dyskalemia (hypokalemia or hyperkalemia) can have profound cardiac and neurological effects. - Abnormal **potassium** values are weighted in the scoring system to indicate increased illness severity. *Creatinine* - **Creatinine** levels are included in the APACHE score as a marker of **renal function**, which is a significant predictor of patient outcome. - Elevated **creatinine** indicates kidney dysfunction, contributing points to the overall severity assessment.

Q: Best indicator to determine fluid required in hypovolemic patient is

PCWP. ***PCWP*** - **Pulmonary capillary wedge pressure (PCWP)** indirectly measures left atrial pressure, which reflects left ventricular end-diastolic pressure, a key indicator of **cardiac preload** and fluid status [1]. - A low PCWP in a hypovolemic patient suggests the need for **fluid resuscitation** to optimize cardiac output. *2D echo* - While 2D echocardiography can assess **cardiac function** and some parameters related to fluid status (like IVC collapsibility), it is not the most direct or specific indicator for fluid requirement in an acutely hypovolemic patient. - Its use often requires a skilled operator and is primarily diagnostic for structural and functional abnormalities rather than real-time fluid responsiveness guidance. *CVP* - **Central venous pressure (CVP)** reflects right atrial pressure, which is a measure of **right ventricular preload** [1]. - CVP can be misleading in patients with **right ventricular dysfunction** or **pulmonary hypertension**, making it less reliable for assessing overall fluid status compared to PCWP [1]. *Intra arterial BP* - **Intra-arterial blood pressure (BP)** is a direct and accurate measure of systemic arterial pressure, indicating **perfusion**. - While hypotension (low BP) is common in hypovolemia, BP alone does not reliably indicate the *amount* of fluid required or the patient's **fluid responsiveness**, as compensatory mechanisms can maintain BP even with significant volume loss.

Q: For shock patient, best guideline to check for adequacy of fluid replacement therapy:

Urine output. Detailed assessment of a shock patient involves monitoring multiple parameters to guide fluid therapy. ***Urine output*** is a sensitive indicator of **renal perfusion** and overall tissue perfusion, reflecting the adequacy of fluid resuscitation [1]. A target urine output of **0.5-1 mL/kg/hour** is generally used in shock patients to ensure sufficient organ perfusion. *Central Venous Pressure* - **Central Venous Pressure (CVP)** can be a misleading indicator of fluid status, as it reflects right atrial pressure and not necessarily ventricular preload or cardiac output [1]. - While it provides some information, it has limitations as a sole measure for guiding fluid resuscitation due to its poor correlation with **volume responsiveness**, and certain conditions like pulmonary hypertension may raise CVP even in hypovolemia [1]. *Hemoglobin* - **Hemoglobin** levels primarily reflect the oxygen-carrying capacity of the blood and are crucial for diagnosing **anemia** or assessing **blood loss**. - It does not directly indicate the adequacy of fluid volume or tissue perfusion, especially in cases of distributive or cardiogenic shock without significant hemorrhage. *Blood pressure and pulse* - **Blood pressure** and **pulse rate** are important vital signs for assessing the initial response to fluid resuscitation and the presence of shock [1]. - However, they can be maintained within normal limits by compensatory mechanisms even in ongoing hypoperfusion (**compensated shock**), making them less reliable as a sole indicator of adequate fluid replacement [1].

Question 1

The following are true of Mendelson's syndrome –

Accepted Answer

Onset of symptoms generally occurs within 30 minutes

Answer

Steroids have been shown to improve outcome

Answer

Critical volume of aspirate is 50 mls

Answer

Critical pH of gastric aspirate is 1.5

Question 2

Which is the best initial fluid for resuscitation during the shock state:

Accepted Answer

Crystalloids

Answer

Plasma substitutes

Answer

Blood

Answer

Colloids

Question 3

What is the treatment for class I hypovolemic shock?

Accepted Answer

Oral liquids

Answer

IV fluids alone

Answer

Admission and IV fluids

Answer

Blood transfusion

Question 4

To prevent ventilator associated pneumonia, the most effective and evidence based results are seen with which of the following for critically ill patients:

Accepted Answer

Oral hygiene procedures plus chlorhexidine

Answer

Powered brushing

Answer

Manual brushing

Answer

Betadine mouthwash

Question 5

Adverse effects of hypothermia are all except:

Accepted Answer

Decreased peripheral resistance

Answer

Cardiac arrhythmias

Answer

Renal failure

Answer

Reversible coagulopathy

Question 6

Which of the following is a feature of crush syndrome -

Accepted Answer

Myoglobinuria

Answer

Hypophosphatemia

Answer

Hypokalemia

Answer

Hypercalcemia

Question 7

A patient presents with multiple fractures. He develops respiratory distress and dies after few days. CT brain shows petechial hemorrhage. Most likely diagnosis is:

Accepted Answer

Fat embolism

Answer

Hypoxic ischemic encephalopathy

Answer

Hemorrhage

Answer

Stroke

Question 8

Which of the following is not a component of APACHE score

Accepted Answer

Serum calcium

Answer

Serum sodium

Answer

Serum potassium

Answer

Creatinine

Question 9

Best indicator to determine fluid required in hypovolemic patient is

Accepted Answer

PCWP

Answer

2D echo

Answer

CVP

Answer

Intra arterial BP

Question 10

For shock patient, best guideline to check for adequacy of fluid replacement therapy:

Accepted Answer

Urine output

Answer

Central Venous Pressure

Answer

Hemoglobin

Answer

Blood pressure and pulse

Critical Care — MCQs

Critical Care — MCQs

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