Drugs Used in Shock — MCQs
A 30-year-old female patient developed features of septicemia, presenting with shock characterized by hypotension and low urine output, and was being treated for colonic necrosis. What is the most likely management?
Which of the following agents is not used to provide induced hypotension during surgery ?
Which type of hemorrhagic shock is associated with 15-30% blood loss?
Which drug is used as an adjunct to epinephrine in refractory ventricular fibrillation/ventricular tachycardia during cardiac arrest?
A patient in shock comes to you in the trauma ward. You examine him and decide not to give him vasoconstrictors. Which type of shock is your patient having?
In which of the following conditions is glucocorticoid used?
Which of the following is the best inotrope agent for use in right heart failure secondary to pulmonary hypertension?
Which antilipidemic drug reduces cholesterol levels by inhibiting cholesterol absorption?
Drug of choice in cardiogenic shock is
The drug that causes fall in elderly patients with postural hypotension is:-
Drugs Used in Shock Indian Medical PG Practice Questions and MCQs
Question 1: A 30-year-old female patient developed features of septicemia, presenting with shock characterized by hypotension and low urine output, and was being treated for colonic necrosis. What is the most likely management?
- A. IV fluids only
- B. None of the options
- C. Antibiotics
- D. IV fluids + antibiotics + norepinephrine (Correct Answer)
Explanation: ***IV fluids + antibiotics + norepinephrine*** - This patient presents with **septic shock** due to **colonic necrosis**, requiring aggressive management with **fluid resuscitation**, broad-spectrum **antibiotics**, and **vasopressors** like norepinephrine to combat hypotension and improve organ perfusion [1], [2]. - **Colonic necrosis** is a severe infection source that necessitates prompt and comprehensive treatment to prevent multi-organ failure [2]. *IV fluids only* - While **IV fluids** are critical for initial resuscitation in septic shock, they are insufficient as a standalone treatment due to the underlying severe infection and inadequate response to fluids alone as evidenced by ongoing shock [2]. - Giving fluids alone without addressing the infection and persistent hypotension will likely lead to continued organ dysfunction and higher mortality. *Antibiotics* - **Antibiotics** are essential to treat the underlying infection causing sepsis, especially in the context of **colonic necrosis** [3]. - However, antibiotics alone will not immediately resolve the **hypotension** and **poor organ perfusion** associated with septic shock, which requires concurrent fluid resuscitation and vasopressor support [2]. *None of the options* - This option is incorrect because the combination of IV fluids, antibiotics, and norepinephrine is the standard and most appropriate treatment for **septic shock** stemming from a severe source like colonic necrosis. - Withholding these crucial interventions would be detrimental and potentially fatal for the patient in septic shock.
Question 2: Which of the following agents is not used to provide induced hypotension during surgery ?
- A. Mephenteramine (Correct Answer)
- B. Sodium nitroprusside
- C. Hydralazine
- D. Esmolol
Explanation: ***Mephenteramine*** - **Mephentermine** is a **vasopressor** used to **increase blood pressure**, acting primarily through the release of **norepinephrine**. - Its effects are opposite to what is desired for **induced hypotension** during surgery, as the goal is to lower systemic blood pressure to reduce blood loss and improve surgical field visibility. *Sodium nitroprusside* - **Sodium nitroprusside** is a potent **vasodilator** that directly relaxes both **arterial** and **venous smooth muscle**, leading to a rapid and significant decrease in blood pressure. - Its rapid onset and offset of action make it a valuable agent for **controlled induced hypotension** during surgery. *Hydralazine* - **Hydralazine** is a **direct-acting arterial vasodilator** that primarily relaxes arterial smooth muscle, leading to a decrease in **peripheral vascular resistance** and blood pressure. - It can be used to induce or maintain **hypotension** during surgery, although its onset of action is slower compared to nitroprusside. *Esmolol* - **Esmolol** is a **short-acting beta-1 selective adrenergic blocker** that reduces heart rate and myocardial contractility, thereby decreasing cardiac output. - By reducing cardiac output, esmolol can contribute to **induced hypotension**, often used in conjunction with vasodilators or in situations where controlling heart rate is also desired.
Question 3: 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 4: Which drug is used as an adjunct to epinephrine in refractory ventricular fibrillation/ventricular tachycardia during cardiac arrest?
- A. Atropine
- B. Adenosine
- C. High dose vasopressin
- D. Amiodarone infusion (Correct Answer)
Explanation: ***Amiodarone infusion*** - **Amiodarone** is a **Class III antiarrhythmic** drug commonly used in advanced cardiac life support (ACLS) protocols for refractory **ventricular fibrillation (VF)** or **pulseless ventricular tachycardia (VT)** that persists despite defibrillation and epinephrine [1]. - It works by blocking potassium channels, prolonging repolarization and the refractory period, which helps to stabilize the electrical activity of the heart. *Atropine* - **Atropine** is an anticholinergic drug primarily used to treat **symptomatic bradycardia** by increasing heart rate. - It is not indicated for the treatment of **ventricular fibrillation** or **ventricular tachycardia** during cardiac arrest. *High dose vasopressin* - **Vasopressin** was previously included in some ACLS algorithms as an alternative to epinephrine for **vasoconstrictive effects**, but recent guidelines do not support its routine use in cardiac arrest. - While it can cause **vasoconstriction**, there is no evidence that high-dose vasopressin improves outcomes in refractory VF/VT over epinephrine. *Adenosine* - **Adenosine** is an antiarrhythmic drug used to treat **supraventricular tachycardias (SVTs)** by transiently blocking the AV node. - It is not effective for **ventricular fibrillation** or **ventricular tachycardia** and can even be harmful in these rhythms.
Question 5: A patient in shock comes to you in the trauma ward. You examine him and decide not to give him vasoconstrictors. Which type of shock is your patient having?
- A. Cardiogenic shock
- B. Distributive shock (Correct Answer)
- C. Neurogenic shock
- D. Hemorrhagic shock
Explanation: ***Distributive shock*** - Distributive shock, particularly **septic shock**, often presents with **peripheral vasodilation** and a low systemic vascular resistance. - Administering additional **vasoconstrictors** in this context could worsen tissue perfusion if not carefully titrated, as the primary issue is maldistribution of blood flow rather than inadequate vascular tone alone. *Cardiogenic shock* - In **cardiogenic shock**, there is **myocardial dysfunction** leading to decreased cardiac output. - **Vasoconstrictors** may be used cautiously to maintain systemic perfusion pressure and improve coronary perfusion, although inotropes are often prioritized. *Neurogenic shock* - **Neurogenic shock** is a form of distributive shock caused by the **loss of sympathetic tone** due to spinal cord injury, leading to widespread vasodilation [1]. - **Vasoconstrictors** are a primary treatment in neurogenic shock to restore vascular tone and increase blood pressure [1]. *Hemorrhagic shock* - **Hemorrhagic shock** results from **significant blood loss**, leading to decreased circulating volume and reduced cardiac output. - The immediate priority is **fluid resuscitation** and **stopping the bleeding**, but vasoconstrictors are not typically the primary treatment and can worsen perfusion in some vascular beds [1].
Question 6: In which of the following conditions is glucocorticoid used?
- A. Severe typhoid (Correct Answer)
- B. E. coli septicemia
- C. Cerebral malaria
- D. Leishmaniasis
Explanation: ***Severe typhoid*** * **Glucocorticoids** (e.g., **dexamethasone**) are indicated in **severe typhoid fever** with altered mental status, delirium, stupor, coma, or shock, as they can reduce inflammation and improve neurological outcomes. * Their use in severe typhoid can decrease mortality by attenuating the systemic inflammatory response induced by *Salmonella Typhi*. *E. coli septicemia* * The use of **glucocorticoids** in **bacterial sepsis**, including *E. coli* septicemia, is generally controversial and not recommended unless there is confirmed or suspected **adrenal insufficiency**. * Routine use can increase the risk of secondary infections and other adverse effects without clear mortality benefit in immunocompetent patients. *Cerebral malaria* * **Glucocorticoids** are **contraindicated** in **cerebral malaria** because studies have shown they increase the risk of complications (e.g., gastrointestinal bleeding, seizures, hyperglycemia, infections) without improving neurological outcomes or survival. * Their use can worsen immune suppression in a disease already characterized by significant immune dysregulation. *Leishmaniasis* * **Glucocorticoids** are **not a primary treatment** for **leishmaniasis**, which is caused by a protozoan parasite and requires specific antileishmanial drugs. * While they might be used to manage severe inflammatory reactions in specific forms (e.g., post-kala-azar dermal leishmaniasis), they are not a standard therapeutic intervention and can even exacerbate the infection by suppressing the immune response.
Question 7: Which of the following is the best inotrope agent for use in right heart failure secondary to pulmonary hypertension?
- A. Milrinone (Correct Answer)
- B. Dobutamine
- C. Digoxin
- D. Dopamine
Explanation: ***Milrinone*** - Milrinone is a **phosphodiesterase-3 inhibitor** that increases myocardial contractility and causes **pulmonary and systemic vasodilation**. - Its vasodilatory effect is particularly beneficial in **pulmonary hypertension** as it can help reduce **pulmonary vascular resistance (PVR)**, a critical factor in right heart failure. - The combination of **positive inotropy** and **selective pulmonary vasodilation** makes it the optimal choice for right ventricular failure secondary to pulmonary hypertension. *Dobutamine* - Dobutamine is a **beta-1 agonist** that primarily increases myocardial contractility with some beta-2 mediated vasodilation. - While it improves cardiac output, its lesser effect on **pulmonary vascular resistance** compared to milrinone makes it less ideal for right heart failure specifically complicated by pulmonary hypertension. *Digoxin* - Digoxin is a **cardiac glycoside** that increases contractility but has a slow onset of action and a narrow therapeutic window, making it less suitable for acute management. - It does not significantly reduce **pulmonary vascular resistance** and is primarily used for chronic heart failure or rate control in atrial fibrillation. *Dopamine* - Dopamine is a **catecholamine** with dose-dependent effects: at moderate doses (5-10 mcg/kg/min), it acts as a **beta-1 agonist** providing inotropic support. - However, at higher doses it causes **alpha-adrenergic vasoconstriction** which can **increase pulmonary vascular resistance**, potentially worsening right heart failure in pulmonary hypertension. - Unlike milrinone, it lacks specific pulmonary vasodilatory properties beneficial for reducing RV afterload.
Question 8: Which antilipidemic drug reduces cholesterol levels by inhibiting cholesterol absorption?
- A. Ezetimibe (Correct Answer)
- B. Orlistat
- C. Cholestyramine
- D. Statins
Explanation: ***Ezetimibe*** - **Ezetimibe** selectively inhibits the **Niemann-Pick C1-Like 1 (NPC1L1) protein**, which is responsible for plant sterol and cholesterol absorption in the small intestine. - This action leads to a reduction in **LDL-C** levels by decreasing the amount of cholesterol available to the liver. *Orlistat* - **Orlistat** is a **lipase inhibitor** that prevents the absorption of dietary fats by inhibiting gastric and pancreatic lipases. - While it aids in weight loss and can indirectly improve lipid profiles, its primary mechanism is *not* direct inhibition of cholesterol absorption. *Cholestyramine* - **Cholestyramine** is a **bile acid sequestrant** that binds to bile acids in the intestine, preventing their reabsorption. - This increases the excretion of bile acids, prompting the liver to synthesize more bile acids from cholesterol, thereby lowering cholesterol levels, but it does *not* directly inhibit cholesterol absorption. *Statins* - **Statins** (HMG-CoA reductase inhibitors) are considered first-line agents for lowering cholesterol by inhibiting the **rate-limiting step in cholesterol synthesis** in the liver. - Their primary action is to reduce endogenous cholesterol production, not to block cholesterol absorption from the gut.
Question 9: Drug of choice in cardiogenic shock is
- A. Noradrenaline
- B. Dopamine (Correct Answer)
- C. Adrenaline
- D. Phenylephrine
Explanation: ***Dopamine*** - **Dopamine** is often considered the **drug of choice** in cardiogenic shock because, at low to moderate doses, it increases myocardial contractility and heart rate (positive inotropic and chronotropic effects) while also improving renal perfusion. - Its ability to stimulate **alpha-1, beta-1, and dopaminergic receptors** makes it effective in improving cardiac output and maintaining organ perfusion in this critical condition. *Phenylephrine* - **Phenylephrine** is a selective **alpha-1 adrenergic agonist** that causes potent vasoconstriction and increases systemic vascular resistance. - While it effectively raises blood pressure, it **lacks inotropic effects** and can actually **reduce cardiac output** through reflex bradycardia and increased afterload. - Its strong vasoconstrictive effects without inotropic support make it **not suitable** as a primary agent in cardiogenic shock where cardiac contractility is already compromised. *Noradrenaline* - **Noradrenaline (norepinephrine)** is a potent vasoconstrictor primarily acting on alpha-1 receptors, leading to a significant increase in systemic vascular resistance and blood pressure. - While useful in some forms of shock, its strong vasoconstrictive effect can **increase afterload** and potentially worsen myocardial oxygen demand in cardiogenic shock with already compromised cardiac function. *Adrenaline* - **Adrenaline (epinephrine)** has strong **beta-1 and alpha-1 agonist effects**, leading to increased heart rate, contractility, and vasoconstriction. - While it can improve blood pressure and cardiac output, its significant **chronotropic and arrhythmogenic effects**, along with increased myocardial oxygen demand, make it less favorable than dopamine as a first-line agent in cardiogenic shock.
Question 10: The drug that causes fall in elderly patients with postural hypotension is:-
- A. Acarbose
- B. Prazosin (Correct Answer)
- C. Nor-adrenaline
- D. Metformin
Explanation: ***Prazosin*** - **Alpha-1 adrenergic blocker** used to treat hypertension and benign prostatic hyperplasia (BPH) - Commonly causes **orthostatic hypotension (postural hypotension)** as a side effect by blocking alpha-1 receptors on vascular smooth muscle, preventing compensatory vasoconstriction upon standing - Leads to **dizziness, lightheadedness, and falls**, especially in elderly patients who have reduced baroreceptor sensitivity - **First-dose phenomenon** is particularly notable, with marked hypotension after the initial dose *Acarbose* - Alpha-glucosidase inhibitor used to treat type 2 diabetes by reducing carbohydrate absorption in the intestine - Primary side effects are **gastrointestinal** (flatulence, diarrhea, abdominal discomfort) - Does not affect blood pressure or cause postural hypotension *Nor-adrenaline (Norepinephrine)* - **Vasopressor** and sympathomimetic agent that causes vasoconstriction through alpha-adrenergic receptor stimulation - **Increases blood pressure** and is used to treat severe hypotension in critical care settings - Would not cause falls due to postural hypotension; rather, it counteracts hypotension *Metformin* - **Biguanide** oral hypoglycemic agent for type 2 diabetes that primarily decreases hepatic glucose production and increases insulin sensitivity - Main side effects include gastrointestinal disturbances and rare lactic acidosis - Not associated with postural hypotension or increased risk of falls
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