Shock: Classification and Management — MCQs
Shock is clinically best assessed by:
Most common type of shock in emergency room is
A patient who met with an accident presented to the emergency department, he lost 25% of his total blood volume approximately, blood pressure is normal. He/she will be classified under which class of hypovolemic shock?
Which type of hemorrhagic shock is associated with 15-30% blood loss?
Main cause of shock is?
What is the preferred fluid in a poly-traumatic patient with shock?
Which of the following statements about shock in children is correct?
After a road traffic accident, a patient presented to casualty with vitals showing BP of 90/60 mm Hg and heart rate of 56 bpm. Which kind of shock occurs?
A 16-year-old girl with acute vaginal bleeding presents to the clinic. What is the immediate management?
During cardiopulmonary resuscitation in an adult, at what rate are chest compressions given?
Shock: Classification and Management Indian Medical PG Practice Questions and MCQs
Question 1: Shock is clinically best assessed by:
- A. CVP
- B. BP
- C. Hydration
- D. Mental status (Correct Answer)
Explanation: **Mental status** - The **brain** is highly sensitive to tissue perfusion, and changes in mental status (e.g., confusion, disorientation) are often among the **earliest and most reliable clinical indicators of inadequate organ perfusion** in shock [1]. - Assessing mental status is a quick, non-invasive method to gauge the adequacy of **cerebral blood flow**, directly reflecting the body's response to hypoperfusion [1]. *CVP* - **Central Venous Pressure (CVP)** primarily reflects the right ventricular preload and overall fluid status but does not directly measure tissue perfusion throughout the body [1]. - While CVP can guide fluid resuscitation, it is not a direct measure of systemic tissue oxygenation and can be affected by numerous factors unrelated to shock severity [1]. *BP* - **Blood pressure (BP)** is a relatively late and insensitive indicator of shock, as compensatory mechanisms can maintain BP within normal limits even when significant hypoperfusion is already occurring [1]. - By the time **hypotension** (low BP) is observed, shock is often advanced, and other signs of organ dysfunction may already be present [1]. *Hydration* - **Hydration status** refers to the body's overall fluid balance and, while important in managing shock, is not the best clinical assessment tool for defining the presence or severity of shock itself. - While dehydration can contribute to hypovolemic shock, assessing hydration is an indirect measure and doesn't directly reflect systemic tissue perfusion or oxygen delivery.
Question 2: Most common type of shock in emergency room is
- A. Obstructive
- B. Hypovolaemic (Correct Answer)
- C. Cardiogenic
- D. Neurogenic
Explanation: ***Hypovolaemic*** - **Hypovolemic shock** is the most frequent type of shock encountered in emergency rooms due to its association with a wide range of common conditions, such as **hemorrhage** (trauma, gastrointestinal bleeding) and severe dehydration. - It results from a significant **loss of circulating blood volume**, leading to inadequate tissue perfusion [2]. *Obstructive* - **Obstructive shock** occurs when there is a physical obstruction to blood flow, such as in **pulmonary embolism** [1] or **cardiac tamponade** [3]. - While serious, these conditions are less common overall in the emergency setting compared to causes of hypovolemia. *Cardiogenic* - **Cardiogenic shock** is caused by the heart's inability to pump sufficient blood, typically due to **myocardial infarction** [3] or severe heart failure. - Although life-threatening, it is less common than hypovolemic shock as a primary presenting etiology in the emergency department. *Neurogenic* - **Neurogenic shock** is a distributive shock caused by a severe injury to the **central nervous system**, leading to loss of sympathetic tone and widespread vasodilation. - While it can be seen in severe trauma, it is a specific and less common form of shock compared to hypovolemia.
Question 3: A patient who met with an accident presented to the emergency department, he lost 25% of his total blood volume approximately, blood pressure is normal. He/she will be classified under which class of hypovolemic shock?
- A. Class II (Correct Answer)
- B. Class I
- C. Class III
- D. Class IV
Explanation: ***Class II*** - A 25% blood loss (within the **15-30% range**), with **blood pressure remaining normal**, categorizes this patient into **Class II hypovolemic shock**. - In Class II, compensatory mechanisms such as increased **heart rate** and **peripheral vasoconstriction** maintain systolic blood pressure despite significant volume loss. - Patients typically present with **tachycardia (100-120 bpm)**, **narrowed pulse pressure**, mild **anxiety**, and **normal systolic BP**. *Class I* - Class I shock involves **minimal blood loss** (up to 15%), with blood loss <750 mL in adults. - Patients in Class I typically present with **normal vital signs** and minimal to no clinical symptoms. - The 25% blood loss exceeds the threshold for Class I classification. *Class III* - Class III shock is characterized by blood loss of **30-40%** (1500-2000 mL in adults). - This level of loss typically results in **decreased systolic blood pressure**, **marked tachycardia (120-140 bpm)**, **confusion**, and clinical instability. - The patient's normal blood pressure and 25% loss are **below the threshold** for Class III shock. *Class IV* - Class IV shock involves massive blood loss of **greater than 40%** (>2000 mL in adults). - Presents with profound **hypotension**, **severe tachycardia (>140 bpm)**, **altered consciousness**, and **imminent cardiovascular collapse**. - This patient's normal blood pressure and stable condition are inconsistent with Class IV shock.
Question 4: Which type of hemorrhagic shock is associated with 15-30% blood loss?
- A. Class 4
- B. Class 3
- C. Class 2 (Correct Answer)
- D. Class 1
Explanation: **Class 2** - **Class 2 hemorrhagic shock** is defined by a **15-30% blood loss** (approximately 750-1500 mL in an adult). - Patients typically present with **tachycardia** (heart rate >100 bpm), slight decrease in pulse pressure, and normal or slightly increased respiratory rate. *Class 4* - **Class 4 hemorrhagic shock** involves a blood loss greater than **40%** of total blood volume. - This is a **life-threatening condition** characterized by significant decreases in blood pressure, altered mental status, and severe tachycardia. *Class 3* - **Class 3 hemorrhagic shock** is associated with a blood loss of **30-40%** of total blood volume. - Patients exhibit marked **tachycardia**, significant drops in blood pressure, and often require blood transfusion. *Class 1* - **Class 1 hemorrhagic shock** involves a blood loss of up to **15%** of total blood volume. - Patients usually have **minimal clinical symptoms**, with normal heart rate, blood pressure, and pulse pressure.
Question 5: Main cause of shock is?
- A. Hypoperfusion of tissue (Correct Answer)
- B. Hypotension
- C. Hypoxia
- D. Dehydration
Explanation: ***Hypoperfusion of tissue*** - **Shock** is fundamentally a state of inadequate cellular energy production due to insufficient delivery of oxygen and nutrients to tissues [1], [2]. - This **tissue hypoperfusion** leads to cellular dysfunction, organ damage, and ultimately, death if not corrected [2]. *Hypotension* - **Hypotension** (low blood pressure) is a common *sign* or *symptom* of shock, but it is not the underlying cause [2]. - While significant hypotension often leads to hypoperfusion, normotensive shock can occur if tissue demands are extremely high or if microcirculation is severely impaired [2]. *Hypoxia* - **Hypoxia** refers to a deficiency in the amount of oxygen reaching the tissues. While hypoxia is a *consequence* of poor tissue perfusion in shock, it is not the main *cause* [2]. - Tissue hypoperfusion results in inadequate oxygen delivery, leading to cellular hypoxia, but the primary deficit is the overall blood flow [2]. *Dehydration* - **Dehydration** is a *cause* of **hypovolemic shock**, which is one *type* of shock [1]. - It leads to reduced intravascular volume, which can cause decreased cardiac output and subsequent tissue hypoperfusion, but it is not the main cause of shock in general.
Question 6: What is the preferred fluid in a poly-traumatic patient with shock?
- A. Ringer lactate (Correct Answer)
- B. Dextran
- C. Normal saline
- D. Dextrose-normal saline
Explanation: ***Ringer lactate*** - **Ringer's lactate (RL)** is the **preferred initial resuscitation fluid** for poly-traumatic patients with shock according to **ATLS (Advanced Trauma Life Support) guidelines**. - It is a **balanced crystalloid** with electrolyte composition similar to plasma, providing effective volume expansion while minimizing the risk of **hyperchloremic metabolic acidosis** that occurs with large-volume normal saline administration. - The lactate in RL is rapidly metabolized to bicarbonate by the liver, helping to buffer any existing acidosis, and does not worsen lactic acidosis in trauma patients. - RL also contains **potassium and calcium**, which help maintain physiological electrolyte balance during resuscitation. *Normal saline* - While **normal saline (0.9% NaCl)** is an isotonic crystalloid, it has a **supraphysiological chloride concentration** (154 mEq/L) compared to plasma (100 mEq/L). - Large-volume administration in trauma can cause **hyperchloremic metabolic acidosis**, which can worsen outcomes and is particularly problematic in poly-trauma patients already at risk for metabolic derangements. - It remains acceptable as an alternative when RL is unavailable, but is no longer considered the first-line choice in modern trauma protocols. *Dextran* - **Dextran** is a colloid solution that carries significant risks including **anaphylactic reactions** and **coagulopathy** by interfering with platelet function and clotting factors. - These adverse effects are particularly dangerous in poly-traumatic patients who may already have traumatic coagulopathy. - It is **not recommended** for initial trauma resuscitation due to these risks and lack of proven superiority over crystalloids. *Dextrose-normal saline* - **Dextrose-containing solutions** are hypotonic after dextrose metabolism, leading to ineffective intravascular volume expansion as fluid shifts into the intracellular compartment. - They can worsen **cerebral edema** in head-injured trauma patients and cause dangerous electrolyte imbalances. - These solutions are **contraindicated** in acute trauma resuscitation.
Question 7: Which of the following statements about shock in children is correct?
- A. Tachycardia is a sensitive indicator of shock in children. (Correct Answer)
- B. Mottling of extremities is an early sign of shock.
- C. Confusion and stupor are early signs of shock.
- D. Respiratory rate is a more sensitive indicator of shock than heart rate.
Explanation: ***Tachycardia is a sensitive indicator of shock in children.*** - **Tachycardia** is often the first and most reliable sign of **compensated shock** in children, as their cardiovascular system initially maintains cardiac output by increasing heart rate. - Children have a remarkable ability to compensate for significant fluid loss, and an elevated heart rate helps maintain **perfusion** before blood pressure drops. *Mottling of extremities is an early sign of shock.* - **Mottling** of extremities is typically a sign of **decompensated shock** and indicates significant vasoconstriction and poor tissue perfusion. - It is a **late sign** that suggests the child's compensatory mechanisms are failing. *Confusion and stupor are early signs of shock.* - **Altered mental status**, such as confusion or stupor, usually indicates **severe shock** and reduced cerebral perfusion. - These are generally **late signs** of shock, appearing after initial compensatory mechanisms have failed. *Respiratory rate is a more sensitive indicator of shock than heart rate.* - While **tachypnea** can be present in shock due to metabolic acidosis or compensatory mechanisms, **tachycardia** is a more consistently sensitive and earlier indicator of circulatory compromise. - Respiratory changes can also be influenced by other factors like pain, fever, or respiratory illness, making heart rate a more specific initial marker for shock.
Question 8: After a road traffic accident, a patient presented to casualty with vitals showing BP of 90/60 mm Hg and heart rate of 56 bpm. Which kind of shock occurs?
- A. Cardiogenic
- B. Neurogenic (Correct Answer)
- C. Hypovolemic shock
- D. Septic shock
Explanation: ***Neurogenic*** - This patient presents with **hypotension** (BP 90/60 mm Hg) and **bradycardia** (heart rate 56 bpm), which is a classic presentation of neurogenic shock due to **loss of sympathetic tone** following a spinal cord injury [2]. - The road traffic accident suggests a potential **spinal cord injury**, leading to disruption of the autonomic nervous system's control over heart rate and vascular tone. *Cardiogenic* - Cardiogenic shock is characterized by **hypotension** and **tachycardia**, often due to the heart's inability to pump blood effectively, such as in a myocardial infarction [1]. - The reported **bradycardia** in this patient makes cardiogenic shock unlikely. *Hypovolemic shock* - Hypovolemic shock results from significant **fluid loss**, leading to **hypotension** and a compensatory **tachycardia**. - The presence of **bradycardia** rules out hypovolemic shock, as the body would typically try to increase heart rate to compensate for volume depletion. *Septic shock* - Septic shock is caused by a severe **infection**, leading to widespread vasodilation, **hypotension**, and often **tachycardia** with signs of systemic inflammation. - There is no indication of infection, and the **bradycardia** is inconsistent with the typical presentation of septic shock.
Question 9: A 16-year-old girl with acute vaginal bleeding presents to the clinic. What is the immediate management?
- A. Administer high-dose estrogen
- B. Perform dilation and curettage
- C. Start tranexamic acid
- D. Stabilize the patient and investigate the cause of bleeding (Correct Answer)
Explanation: ***Stabilize the patient and investigate the cause of bleeding*** - In a patient with acute bleeding, the **immediate priority** is to stabilize their hemodynamic status, which may involve intravenous fluids or blood transfusion, followed by a thorough investigation to identify the underlying cause of bleeding. - A 16-year-old presenting with acute vaginal bleeding requires a **comprehensive medical evaluation** to rule out trauma, pregnancy-related complications, coagulation disorders, or structural abnormalities before specific treatments are initiated. *Administer high-dose estrogen* - High-dose estrogen can be used to **acutely stop uterine bleeding** by promoting rapid endometrial proliferation, but it is not the *immediate* management without patient stabilization and identifying the cause, especially in an acute setting. - While effective for some types of dysfunctional uterine bleeding, it is a **therapeutic intervention**, not the primary step for initial stabilization or diagnosis. *Perform dilation and curettage* - Dilation and curettage (D&C) is a **surgical procedure** used to remove tissue from the uterus and is typically performed for diagnostic or therapeutic reasons after initial assessment and stabilization, or if medical management fails. - It carries risks and is not the first-line immediate management for acute vaginal bleeding in an adolescent without a clear indication, such as severe, uncontrolled bleeding resistant to medical therapy or suspected retained products of conception. *Start tranexamic acid* - Tranexamic acid is an **antifibrinolytic** that helps reduce bleeding by inhibiting fibrinolysis, making it useful for managing menstrual bleeding or other bleeding disorders. - While it can be part of medical management once the patient is stabilized, it is not the *immediate* initial step before hemodynamic stabilization or diagnostic workup to determine the cause of bleeding.
Question 10: During cardiopulmonary resuscitation in an adult, at what rate are chest compressions given?
- A. 72 compressions/min
- B. 90 compressions/min
- C. 100 compressions/min (Correct Answer)
- D. 120 compressions/min
Explanation: **Explanation:** The correct answer is **C. 100 compressions/min**. **Medical Concept:** According to the latest American Heart Association (AHA) and ERC guidelines for Basic Life Support (BLS) and Advanced Cardiovascular Life Support (ACLS), the recommended rate for chest compressions in adults is **100 to 120 compressions per minute**. High-quality CPR is essential to maintain coronary and cerebral perfusion. A rate of at least 100 bpm ensures sufficient cardiac output, while exceeding 120 bpm is discouraged as it reduces the time for ventricular filling and decreases the quality of recoil. **Analysis of Options:** * **A (72/min) & B (90/min):** These rates are too slow. Inadequate compression frequency fails to generate the necessary intrathoracic pressure and arterial perfusion pressure required to restart the heart or protect the brain. * **D (120/min):** While 120 is the upper limit of the recommended range, standard medical examinations (like NEET-PG) traditionally prioritize the baseline "at least 100/min" as the gold standard answer when a range is not provided. **High-Yield Clinical Pearls for NEET-PG:** * **Compression Depth:** 2 to 2.4 inches (5 to 6 cm) in adults. * **Compression-to-Ventilation Ratio:** 30:2 for adults (single or dual rescuer). * **Recoil:** Allow complete chest recoil after each compression to allow the heart to fill. * **Minimize Interruptions:** Keep pauses in compressions to less than 10 seconds. * **EtCO2 Monitoring:** A capnography reading of <10 mmHg during CPR indicates poor quality compressions.
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