Critical Care Medicine Practice Questions

Q: After ensuring the scene is safe, what is the next step in basic life support when a bystander witnesses a person suddenly collapse?

Check for responsiveness. ***Check for responsiveness*** - After ensuring scene safety, the immediate next step is to **check if the person is responsive** to determine if they are conscious and need help. - This typically involves tapping their shoulder and shouting, "Are you okay?" *Call for emergency services* - While calling for emergency services is crucial, it generally occurs **after determining unresponsiveness** and before or immediately after beginning chest compressions. - One should first confirm that the person is in need of emergency medical attention. *Begin chest compressions* - Chest compressions are initiated **after checking for responsiveness** and determining the person is unresponsive and not breathing normally. - Starting compressions prematurely on a conscious individual is inappropriate and potentially harmful. *Open the airway* - Opening the airway (e.g., head-tilt/chin-lift) is performed **after checking for responsiveness** and after calling for help, usually right before checking for breathing or delivering rescue breaths. - It’s part of the assessment for breathing, not the very first step after scene safety.

Q: What is the primary benefit of using dexmedetomidine for sedation in ICU patients?

Minimal respiratory depression. ***Minimal respiratory depression*** * It is an **alpha-2 adrenergic agonist** that provides sedation without significantly affecting **respiratory drive**, making it safer for patients who are difficult to wean from ventilation or have compromised respiratory function. * This differentiates it from other sedatives like benzodiazepines or propofol, which can cause significant **respiratory depression** and prolong mechanical ventilation. *Analgesic properties* * While dexmedetomidine does possess some **analgesic properties**, they are typically mild and often require co-administration with other analgesics for significant pain control. * Its **primary benefit** in ICU sedation relates more to its impact on respiratory function and the ability to achieve cooperative sedation. *Longer half-life* * Dexmedetomidine has a relatively **short half-life** of about 2-3 hours and a rapid distribution phase, allowing for quick titration and relatively rapid emergence from sedation once discontinued. * This is a desirable characteristic in the ICU setting for facilitating neurological assessments and weaning from mechanical ventilation, not a long half-life. *Not cost-effective* * While the acquisition cost of dexmedetomidine can be higher than some other sedatives, its overall cost-effectiveness can be favorable due to reduced time on **mechanical ventilation**, shorter ICU stays, and lower incidence of delirium. * Therefore, direct cost alone does not accurately reflect its value, and it is considered a valuable option despite initial price.

Q: In ACLS, which drug is recommended for use after unsuccessful defibrillation attempts following ventricular fibrillation?

Amiodarone. ***Amiodarone*** - **Amiodarone** is a potent **antiarrhythmic drug** recommended for persistent ventricular fibrillation (VF) or pulseless ventricular tachycardia (VT) unresponsive to initial defibrillation and epinephrine [1]. - It works by blocking potassium channels, prolonging the **repolarization phase** of the action potential, thereby stabilizing the myocardial cell membrane. *Dopamine* - **Dopamine** is a **vasopressor** used to improve blood pressure and cardiac output in cases of symptomatic **bradycardia** unresponsive to atropine or in **shock** with significant hypotension. - It is not indicated for the treatment of ventricular fibrillation [2]. *Adenosine* - **Adenosine** is primarily used to terminate **supraventricular tachycardias (SVTs)** by transiently blocking the AV node. - It is contraindicated in ventricular fibrillation because it can worsen the arrhythmia. *Atropine* - **Atropine** is an **anticholinergic drug** used to treat **symptomatic bradycardia** by increasing heart rate. - It has no role in the management of ventricular fibrillation.

Q: In ACLS, which antiarrhythmic drug can be given following ventricular fibrillation after cardiac arrest other than epinephrine?

Amiodarone. ***Amiodarone*** - **Amiodarone** is a Class III antiarrhythmic agent recommended in ACLS for **refractory ventricular fibrillation (VF)** or pulseless ventricular tachycardia (pVT) after initial defibrillation and epinephrine. - It works by blocking potassium channels, prolonging repolarization, and increasing the **refractory period** in the heart. *Dopamine* - **Dopamine** is a **vasopressor** used to improve **hemodynamics** in patients with symptomatic hypotension, not primarily as an antiarrhythmic for VF. - Its effects include increasing heart rate, myocardial contractility, and blood pressure. *Adenosine* - **Adenosine** is a drug of choice for **supraventricular tachycardia (SVT)** to interrupt reentry pathways in the AV node. - It is not indicated for ventricular fibrillation, as it would be ineffective in this rhythm. *Atropine* - **Atropine** is an **anticholinergic agent** used to treat **symptomatic bradycardia** by increasing heart rate. - It has no role in the management of ventricular fibrillation.

Q: What is the recommended compression-to-ventilation ratio for adult CPR according to the latest AHA guidelines?

30 compressions to 2 ventilations. ***30 compressions to 2 ventilations*** - This ratio is recommended for **adult CPR** by the American Heart Association (AHA), ensuring an optimal balance between blood circulation and oxygen delivery. - It applies to both **single-rescuer** and **two-rescuer CPR** scenarios in adults to maximize effectiveness. *15 compressions to 1 ventilation* - This ratio is typically recommended for **pediatric CPR** (children and infants) when **two rescuers** are present, not for adults. - The higher ventilation frequency in children reflects their greater need for oxygen during resuscitation. *15 compressions to 2 ventilations* - This ratio is not the standard recommendation for adult CPR according to the **AHA guidelines**. - While it offers more ventilations than 15:1, it does not provide the appropriate balance of chest compressions necessary for effective adult resuscitation. *30 compressions to 1 ventilation* - This ratio significantly **reduces the number of ventilations** delivered, which can lead to inadequate oxygenation during adult CPR. - The AHA standard emphasizes the importance of two breaths after every 30 compressions to ensure sufficient oxygen supply.

Q: All are major complications of massive transfusion except hypokalemia.

Hypokalemia. ***Hypokalemia*** - Patients receiving massive transfusions are at risk for **hyperkalemia**, not hypokalemia, due to the release of potassium from stored red blood cells, especially in older units. - The citrate in transfused blood prevents clotting by chelating calcium, and while it does not directly cause hypokalemia, it can impact other electrolyte balances. *Hypothermia* - **Massive transfusion** often involves administering large volumes of intravenous fluids and blood products that are stored at room temperature or colder. - This can lead to a significant drop in the patient's core body temperature, potentially causing **hypothermia**. *Hypomagnesemia* - The **citrate** anticoagulant in transfused blood can chelate not only calcium but also **magnesium**. - This chelation reduces the free, physiologically active magnesium, potentially leading to **hypomagnesemia**. *Hypocalcemia* - **Citrate**, an anticoagulant in transfused blood, binds to **ionized calcium** in the recipient's blood. - In massive transfusions, the liver's ability to metabolize citrate can be overwhelmed, leading to a significant drop in ionized calcium and causing **hypocalcemia**.

Q: In which of the following conditions is Positive end-expiratory pressure (PEEP) beneficial?

Acute Respiratory Distress Syndrome (ARDS). ***Acute Respiratory Distress Syndrome (ARDS)*** - PEEP is crucial in ARDS to prevent **alveolar collapse** at end-expiration, improving oxygenation and reducing the risk of **ventilator-induced lung injury**. - It helps by **recruiting collapsed alveoli** and maintaining them open, thus increasing the functional residual capacity. *Pneumonia* - While pneumonia can cause hypoxemia, PEEP's benefit is less pronounced unless it progresses to **ARDS** or causes significant **atelectasis**. - Excessive PEEP can lead to barotrauma if lung compliance is relatively normal or if only a limited portion of the lung is affected. *Pulmonary edema* - PEEP can be helpful in **cardiogenic pulmonary edema** by reducing venous return and thus **preload**, as well as improving oxygenation. - However, it's not the primary or most universally beneficial intervention compared to its role in ARDS. *Chronic Obstructive Pulmonary Disease (COPD)* - PEEP must be used cautiously in COPD due to the risk of **dynamic hyperinflation** and **auto-PEEP**, which can increase air trapping. - While it might be cautiously applied to improve oxygenation or reduce work of breathing, it's generally not considered broadly beneficial and can be detrimental if not carefully managed.

Q: Which of the following is not true about cardiopulmonary resuscitation (CPR)?

Closed chest massage is as effective as open chest massage. ***Closed chest massage is as effective as open chest massage*** - This statement is **not true** because **open-chest cardiac massage**, while more invasive, can provide significantly higher blood flow (coronary and cerebral) compared to closed-chest compressions. - Open-chest massage allows for direct compression of the heart, leading to better hemodynamics, especially in specific situations like **cardiac tamponade** or trauma. *The most common cause of sudden death is ischemic heart disease* - **Ischemic heart disease**, particularly conditions like myocardial infarction and severe coronary artery disease, is indeed the **leading cause of sudden cardiac death** in adults. - This is due to the high prevalence of atherosclerosis and its propensity to cause life-threatening arrhythmias such as **ventricular fibrillation**. *Standard chest massage generally provides less than 15% of normal coronary and cerebral blood flow* - Standard **closed-chest compressions** are known to generate only a fraction of normal cardiac output, typically **10-30% of normal cerebral blood flow** and **5-15% of normal coronary blood flow**. - This limited blood flow underscores the importance of high-quality, continuous compressions and prompt definitive treatment to improve outcomes. *Early defibrillation improves survival rates in ventricular fibrillation* - **Ventricular fibrillation (VF)** is a common cause of cardiac arrest, and **early defibrillation** (delivery of an electrical shock) is the most effective treatment to terminate VF and restore a perfusing rhythm. - The probability of successful defibrillation and survival **decreases significantly** with every minute that passes without defibrillation.

Q: What is the strength of shock given to a victim of cardiac arrest with a shockable rhythm?

200 J asynch. Shock. ***200 J asynch. Shock*** - For **biphasic defibrillators**, the recommended initial energy dose for a shockable rhythm in adults is typically **200 Joules (J)**. - In cardiac arrest, the shock should be **asynchronous**, meaning it is delivered immediately without synchronization to the QRS complex, to convert the chaotic rhythm. *300 J AC shock* - **300 J** is not a standard initial energy setting for biphasic defibrillation for adult cardiac arrest. - **AC shock** implies alternating current, which is irrelevant; defibrillation uses direct current (DC). *200 J syn. Shock* - While **200 J** is a common energy level for biphasic defibrillation, **synchronized shock** is used for rhythms like **unstable ventricular tachycardia** or **atrial fibrillation**. - In cardiac arrest with a shockable rhythm (e.g., ventricular fibrillation or pulseless ventricular tachycardia), **synchronization is not possible** or appropriate, as there are no organized QRS complexes to synchronize with. *300 J syn. Shock* - **300 J** is not a standard initial energy setting for biphasic defibrillation, and **synchronized shock** is not used for cardiac arrest. - This option incorrectly combines a non-standard energy dose with an inappropriate synchronization method for cardiac arrest.

Question 1

After ensuring the scene is safe, what is the next step in basic life support when a bystander witnesses a person suddenly collapse?

Accepted Answer

Check for responsiveness

Answer

Call for emergency services

Answer

Begin chest compressions

Answer

Open the airway

Question 2

What is the primary benefit of using dexmedetomidine for sedation in ICU patients?

Accepted Answer

Minimal respiratory depression

Answer

Analgesic properties

Answer

Longer half-life

Answer

Not cost-effective

Question 3

What is the primary advantage of compressions-only CPR compared to standard CPR with rescue breaths in out-of-hospital cardiac arrest?

Accepted Answer

Compressions-only CPR leads to higher survival rates and is easier to perform.

Answer

Standard CPR provides better neurological outcomes but is more difficult to perform.

Answer

Standard CPR is the recommended approach for all cardiac arrest situations.

Answer

Compressions-only CPR is the most effective method for out-of-hospital cardiac arrest.

Question 4

In ACLS, which drug is recommended for use after unsuccessful defibrillation attempts following ventricular fibrillation?

Accepted Answer

Amiodarone

Answer

Dopamine

Answer

Adenosine

Answer

Atropine

Question 5

In ACLS, which antiarrhythmic drug can be given following ventricular fibrillation after cardiac arrest other than epinephrine?

Accepted Answer

Amiodarone

Answer

Dopamine

Answer

Adenosine

Answer

Atropine

Question 6

What is the recommended compression-to-ventilation ratio for adult CPR according to the latest AHA guidelines?

Accepted Answer

30 compressions to 2 ventilations

Answer

15 compressions to 1 ventilation

Answer

15 compressions to 2 ventilations

Answer

30 compressions to 1 ventilation

Question 7

All are major complications of massive transfusion except hypokalemia.

Accepted Answer

Hypokalemia

Answer

Hypomagnesemia

Answer

Hypocalcemia

Answer

Hypothermia

Question 8

In which of the following conditions is Positive end-expiratory pressure (PEEP) beneficial?

Accepted Answer

Acute Respiratory Distress Syndrome (ARDS)

Answer

Pneumonia

Answer

Pulmonary edema

Answer

Chronic Obstructive Pulmonary Disease (COPD)

Question 9

Which of the following is not true about cardiopulmonary resuscitation (CPR)?

Accepted Answer

Closed chest massage is as effective as open chest massage

Answer

The most common cause of sudden death is ischemic heart disease

Answer

Standard chest massage generally provides less than 15% of normal coronary and cerebral blood flow

Answer

Early defibrillation improves survival rates in ventricular fibrillation

Question 10

What is the strength of shock given to a victim of cardiac arrest with a shockable rhythm?

Accepted Answer

200 J asynch. Shock

Answer

300 J AC shock

Answer

200 J syn. Shock

Answer

300 J syn. Shock

Critical Care Medicine — MCQs

Critical Care Medicine — MCQs

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