Renal Replacement Therapy — MCQs
Renal transplantation is preferred in
IVC filter is used in the following situations except -
In the initial management of a hemodynamically unstable polytrauma patient, what is the recommended initial crystalloid bolus dose of Ringer's lactate for assessment and stabilization?
What is the treatment for most cases of blunt trauma to the kidney?
For shock patient, best guideline to check for adequacy of fluid replacement therapy:
Rehydration therapy in a 2 year old severely dehydrated child is -
During cardiopulmonary resuscitation in an adult, at what rate are chest compressions given?
A 28-year-old male with septic shock remains hypotensive despite adequate volume replacement; PA occlusion pressure is 18 mm Hg. When dopamine is started, ventricular tachycardia develops and is unresponsive to lidocaine. The V-tach converts back to sinus rhythm once the dopamine is stopped. Which of the following treatments is most appropriate for this hypotensive patient?
The Acute Physiology and Chronic Health Evaluation (APACHE) scoring system is primarily used for what purpose?
What is the maximum concentration of potassium that can be safely delivered via a central line?
Renal Replacement Therapy Indian Medical PG Practice Questions and MCQs
Question 1: Renal transplantation is preferred in
- A. AKI
- B. Bilateral staghorn calculus
- C. Bilateral hydronephrosis
- D. Chronic glomerulonephritis (Correct Answer)
Explanation: ***Chronic glomerulonephritis*** - **Chronic glomerulonephritis** is a common cause of end-stage renal disease (ESRD), requiring renal replacement therapy like transplantation. [1] - Transplantation offers the best long-term outcomes and quality of life compared to dialysis for suitable ESRD patients. [1] *AKI* - **Acute kidney injury (AKI)** is often reversible and does not typically require renal transplantation. [1] - Management focuses on treating the underlying cause to restore kidney function. [1] *Bilateral staghorn calculus* - **Bilateral staghorn calculi** are usually managed with surgical intervention to remove the stones and preserve renal function. - Renal transplantation is not indicated unless the stones lead to irreversible **end-stage renal disease**. [1] *Bilateral hydronephrosis* - **Bilateral hydronephrosis** is treated by relieving the obstruction causing urine backup. - Kidney transplantation is considered only if the obstruction leads to **irreversible kidney damage** and **ESRD**. [1]
Question 2: IVC filter is used in the following situations except -
- A. To reduce symptoms
- B. As primary treatment for acute DVT (Correct Answer)
- C. Negligible size of emboli
- D. To prevent progress of native blood vessel disease
Explanation: ***As primary treatment for acute DVT*** - The **primary treatment** for **acute deep vein thrombosis (DVT)** is **anticoagulation therapy** (heparin, warfarin, or DOACs) to prevent clot propagation and embolization. - An **IVC filter** is **NOT primary therapy**—it is reserved for specific situations and does not treat the underlying thrombosis. - **Indications for IVC filter include:** - Absolute **contraindication to anticoagulation** (active bleeding, recent hemorrhagic stroke) - **Recurrent PE despite adequate anticoagulation** - Complications from anticoagulation therapy - Therefore, using IVC filter as primary treatment for acute DVT is **incorrect and not indicated**. *Negligible size of emboli* - While IVC filters trap **large emboli**, the concept of "negligible size emboli" is not a standard clinical consideration for filter placement. - IVC filters are indicated based on **risk of PE** and **contraindications to anticoagulation**, not based on emboli size assessment. *To reduce symptoms* - **IVC filters** do not reduce symptoms of DVT such as pain, swelling, or discomfort. - They function as a **mechanical barrier** to prevent emboli from reaching pulmonary circulation. - Symptom management requires anticoagulation, compression therapy, and leg elevation. *To prevent progress of native blood vessel disease* - IVC filters do not influence progression of underlying **vascular disease** such as atherosclerosis or chronic venous insufficiency. - Their sole function is **mechanical prevention of PE**, not disease modification.
Question 3: In the initial management of a hemodynamically unstable polytrauma patient, what is the recommended initial crystalloid bolus dose of Ringer's lactate for assessment and stabilization?
- A. 2000 ml Ringer's lactate bolus
- B. 1000 ml Ringer's lactate bolus, then regulated by clinical indicators (Correct Answer)
- C. 250 ml Ringer's lactate bolus
- D. 500 ml Ringer's lactate bolus, then regulated by clinical indicators
Explanation: ***1000 ml Ringer's lactate bolus, then regulated by clinical indicators*** - For **hemodynamically unstable** polytrauma patients, the initial recommended crystalloid bolus is typically **1 liter (1000 mL)** of Ringer's lactate. - This initial bolus allows for rapid assessment of the patient's response and guides subsequent fluid management based on **clinical indicators** such as blood pressure, heart rate, and urine output, avoiding over-resuscitation. *2000 ml Ringer's lactate bolus* - A **2000 ml bolus** is generally considered too large for an initial dose in trauma, as it can lead to **dilutional coagulopathy**, worsening hemorrhage, and **abnormal fluid shifts**, especially in cases where definitive hemorrhage control is not yet achieved. - Excessive fluid administration can lead to complications such as **abdominal compartment syndrome** and **acute respiratory distress syndrome (ARDS)**. *250 ml Ringer's lactate bolus* - A **250 ml bolus** is generally too small to effectively address **hemodynamic instability** in a polytrauma patient, offering insufficient volume to significantly improve circulation or organ perfusion. - While small boluses might be used in specific situations (e.g., small children or patients with cardiac comorbidities), this dose is not adequate for initial resuscitation in a severely unstable adult trauma patient. *500 ml Ringer's lactate bolus, then regulated by clinical indicators* - While **500 mL** is a common bolus size in other medical settings, it may be insufficient for the initial resuscitation of a **hemodynamically unstable adult polytrauma patient**. - Current trauma guidelines often recommend a larger initial bolus (e.g., 1000 mL) to gain a more immediate and measurable hemodynamic response for assessment.
Question 4: What is the treatment for most cases of blunt trauma to the kidney?
- A. Conservative (Correct Answer)
- B. Nephrectomy
- C. Nephrotomy
- D. Nephroplexy
Explanation: ***Conservative*** - The majority of kidney injuries resulting from **blunt trauma** are low-grade (Grades I-III) and can be successfully managed with **conservative (non-operative) methods**. - This typically involves bed rest, careful monitoring of vital signs and urine output, hydration, and serial imaging to ensure stability and healing of the kidney. *Nephrectomy* - **Nephrectomy** (surgical removal of the kidney) is generally reserved for severe, high-grade kidney injuries (Grades IV-V) that are life-threatening or cannot be controlled by other means. - Indications include uncontrollable hemorrhage, extensive renal parenchymal destruction, or a non-viable kidney. *Nephrotomy* - **Nephrotomy** is an incision into the kidney, often performed for stone removal or to drain an abscess, but it is not a primary treatment for blunt traumatic kidney injury. - While surgical repair (nephrorrhaphy) may sometimes be indicated for high-grade injuries to preserve the kidney, a simple nephrotomy is not the standard approach. *Nephroplexy* - **Nephroplexy** is a surgical procedure to fix a prolapsed or "floating" kidney (nephroptosis), which is an entirely different condition from traumatic injury. - This procedure aims to secure the kidney in its normal anatomical position and is not indicated for kidney trauma.
Question 5: For shock patient, best guideline to check for adequacy of fluid replacement therapy:
- A. Central Venous Pressure
- B. Urine output (Correct Answer)
- C. Hemoglobin
- D. Blood pressure and pulse
Explanation: 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 6: Rehydration therapy in a 2 year old severely dehydrated child is -
- A. 75 ml/kg in 4 hours
- B. 30 ml/kg in 1 hour, 70 ml/kg in 5 hours
- C. 20 ml/kg in 30 min, 80 ml/kg in 2.5 hours
- D. 30 ml/kg in 30 min, 70 ml/kg in 2.5 hours (Correct Answer)
Explanation: ***30 ml/kg in 30 min, 70 ml/kg in 2.5 hours*** - This option reflects the recommended rehydration protocol for a severely dehydrated child aged **12 months to 5 years**, where the first 30 ml/kg are given rapidly over 30 minutes, followed by 70 ml/kg over the next 2.5 hours. - This rapid initial infusion helps to quickly restore **circulating volume** and improve perfusion during severe dehydration. *30 ml/kg in 1 hour, 70 ml/kg in 5 hours* - This protocol is typically used for children with **some dehydration**, not severe dehydration, and is usually administered orally when possible. - The slower rate of rehydration would be insufficient for a severely dehydrated child requiring more urgent fluid replacement. *20 ml/kg in 30 min, 80 ml/kg in 2.5 hours* - While reflecting a rapid initial phase, the total volume and distribution of fluids differ from the WHO guidelines for **severe dehydration** in this age group. - The **initial 20 ml/kg over 30 minutes** is generally a slightly lower first bolus than recommended for very severe cases, and the subsequent phase is also adjusted. *75 ml/kg in 4 hours* - This represents a **lower total volume** (75 ml/kg compared to 100 ml/kg) and a different time distribution for severely dehydrated children in the 12 month to 5 year age group. - This protocol is more aligned with the management of **some dehydration** rather than the urgent requirements of severe dehydration.
Question 7: 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.
Question 8: A 28-year-old male with septic shock remains hypotensive despite adequate volume replacement; PA occlusion pressure is 18 mm Hg. When dopamine is started, ventricular tachycardia develops and is unresponsive to lidocaine. The V-tach converts back to sinus rhythm once the dopamine is stopped. Which of the following treatments is most appropriate for this hypotensive patient?
- A. Amrinone
- B. Dobutamine
- C. Epinephrine
- D. Phenylephrine (Correct Answer)
Explanation: ### Explanation The patient is in **septic shock** (distributive shock) with persistent hypotension despite adequate fluid resuscitation (PAOP of 18 mmHg indicates optimal preload). The development of **ventricular tachycardia (VT)** during dopamine infusion indicates **catecholamine-induced arrhythmogenicity**, likely due to stimulation of $\beta_1$ receptors. **Why Phenylephrine is the Correct Choice:** Phenylephrine is a **pure $\alpha_1$-adrenergic agonist**. It causes potent vasoconstriction, increasing systemic vascular resistance (SVR) and mean arterial pressure (MAP) without stimulating $\beta$ receptors. Since the patient’s arrhythmia was triggered by dopamine (which has $\beta_1$ activity), a drug that lacks $\beta$-adrenergic activity is the safest and most effective way to support blood pressure without recurring tachyarrhythmias. **Analysis of Incorrect Options:** * **Amrinone (Inodilator):** A PDE-3 inhibitor that causes vasodilation and has positive inotropic effects. It would worsen hypotension in septic shock and can be arrhythmogenic. * **Dobutamine:** Primarily a $\beta_1$ agonist with some $\beta_2$ activity. It is used for cardiogenic shock or low cardiac output states. It would likely re-induce or worsen the ventricular tachycardia. * **Epinephrine:** A potent agonist of $\alpha_1$, $\beta_1$, and $\beta_2$ receptors. Its strong $\beta_1$ activity makes it highly arrhythmogenic, similar to dopamine. **Clinical Pearls for NEET-PG:** * **Septic Shock Definition:** Hypotension requiring vasopressors to maintain MAP $\geq$ 65 mmHg and serum lactate $>2$ mmol/L despite adequate fluid resuscitation. * **First-line Vasopressor:** Norepinephrine is the gold standard for septic shock. * **Phenylephrine Indication:** Reserved for cases where norepinephrine causes serious arrhythmias or when cardiac output is high but blood pressure remains low. * **Arrhythmogenic Potential:** Dopamine > Epinephrine > Norepinephrine > Phenylephrine (least).
Question 9: The Acute Physiology and Chronic Health Evaluation (APACHE) scoring system is primarily used for what purpose?
- A. Predicting postoperative cardiac risk.
- B. Predicting postoperative pulmonary complications.
- C. Evaluating prognosis in critical care settings. (Correct Answer)
- D. Evaluating prognosis after acute myocardial infarction.
Explanation: **Explanation:** The **APACHE (Acute Physiology and Chronic Health Evaluation)** score is a validated severity-of-disease classification system used primarily in the **Intensive Care Unit (ICU)**. It utilizes parameters such as physiological variables (heart rate, MAP, temperature, etc.), age, and chronic health status to estimate the risk of hospital mortality. The underlying concept is that the severity of acute physiological derangement correlates directly with the risk of death in critically ill patients, regardless of the primary diagnosis. **Analysis of Options:** * **Option A & B:** These are incorrect because postoperative cardiac and pulmonary risks are typically assessed using specific tools like the **Revised Cardiac Risk Index (Lee’s Criteria)** or the **ARISCAT score**. While APACHE can be used for surgical patients in the ICU, it is a general prognostic tool, not a specific preoperative risk predictor. * **Option D:** Prognosis after acute myocardial infarction is specifically evaluated using the **Killip Classification** or the **TIMI Risk Score**, rather than the APACHE system. **High-Yield Clinical Pearls for NEET-PG:** * **APACHE II:** The most commonly used version in clinical practice; it uses **12 physiological variables** and is calculated within the first 24 hours of ICU admission. * **Higher Score = Higher Mortality:** A higher numerical score correlates with a higher predicted mortality rate. * **Other ICU Scoring Systems:** * **SOFA (Sequential Organ Failure Assessment):** Used to track organ dysfunction over time (key for Sepsis-3 criteria). * **GCS (Glasgow Coma Scale):** A component of the APACHE score used to assess neurological status. * **SAPS (Simplified Acute Physiology Score):** An alternative to APACHE for ICU mortality prediction.
Question 10: What is the maximum concentration of potassium that can be safely delivered via a central line?
- A. 20 mmol/L (Correct Answer)
- B. 40 mmol/L
- C. 60 mmol/L
- D. 80 mmol/L
Explanation: **Explanation:** The management of hypokalemia requires careful titration to avoid life-threatening arrhythmias and phlebitis. The concentration of potassium replacement is strictly governed by the route of administration and the urgency of the clinical situation. **Why 20 mmol/L is the correct answer:** While textbooks often cite different "maximums" based on clinical urgency, standard safety guidelines (such as those from the NHS and various critical care societies) recommend a standard concentration of **20 mmol/L** for routine replacement. Although higher concentrations (up to 40 mmol/L) can be infused via a central line in ICU settings under continuous ECG monitoring, 20 mmol/L is considered the safest standard concentration to prevent accidental bolus-induced cardiac arrest and to minimize the risk of hyperkalemia. **Analysis of Incorrect Options:** * **40 mmol/L:** This is typically the maximum concentration allowed for **peripheral** administration (though 10–20 mmol/L is preferred to avoid pain and phlebitis). While it can be given centrally, it is not the "standard" safe limit for routine replacement. * **60 mmol/L & 80 mmol/L:** These are highly concentrated solutions. They are reserved only for extreme, life-threatening hypokalemia in an ICU setting with a dedicated central venous catheter and constant cardiac monitoring. They are never used for routine safety protocols. **High-Yield Clinical Pearls for NEET-PG:** 1. **Rate of Infusion:** The standard rate of potassium replacement should not exceed **10 mmol/hour**. In emergency cases (e.g., paralysis or arrhythmias), it may be increased to **20 mmol/hour** with continuous ECG monitoring. 2. **Peripheral vs. Central:** Peripheral veins are sensitive; concentrations >40 mmol/L cause severe pain and chemical phlebitis. Central lines are preferred for higher concentrations due to rapid dilution in a high-flow vessel. 3. **The "Magnesium" Rule:** If hypokalemia is refractory to treatment, always check and correct **Magnesium** levels. Low magnesium inhibits potassium reabsorption in the kidneys. 4. **ECG Changes:** Remember the sequence—U waves and flattened T waves in hypokalemia; Tall peaked T waves and widened QRS in hyperkalemia.
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