Special Population Considerations — MCQs
Drug that is contraindicated in renal failure is:
All are cardiovascular system changes in pregnancy except.
All of the following are indicators of adequacy of pre-operative resuscitation except
Which of the following is not a risk factor for postoperative pulmonary complication?
All of the following are physiological changes that occur during pregnancy, except which of the following?
Uremic complications typically arise during which of the following phases of renal failure?
In a village, every fifth house was selected for a study. This is an example of
The commonest site of pressure sore is :
Kidney damage and Glomerular Filtration Rate (GFR) value between 15-29 mL / min / 1.73 m^2 are found in which stage of Chronic Kidney Disease?
A 50-year-old diabetic presents with a foot ulcer. Which pathogen is most likely?
Special Population Considerations Indian Medical PG Practice Questions and MCQs
Question 1: Drug that is contraindicated in renal failure is:
- A. Isoniazid
- B. Ethambutol
- C. Streptomycin (Correct Answer)
- D. Rifampicin
Explanation: ***Streptomycin*** - **Streptomycin** is primarily cleared renally, and its accumulation in **renal failure** can lead to significant **ototoxicity** and **nephrotoxicity**. - Its use in patients with compromised kidney function is contraindicated or requires significant dose reduction and careful monitoring. *Isoniazid* - **Isoniazid** is metabolized mainly by the liver, and only a small portion is excreted unchanged by the kidneys, making it relatively safe in **renal failure** with slight dose adjustments. - While it can cause **hepatotoxicity**, its renal excretion is not a primary concern. *Ethambutol* - Although **Ethambutol** is primarily eliminated renally, its dose can be adjusted in **renal failure** to prevent toxicity, most notably **optic neuritis**. - It is not outright contraindicated, but careful monitoring of renal function and visual acuity is necessary. *Rifampicin* - **Rifampicin** is extensively metabolized by the liver and is largely excreted through bile and feces, with only a small fraction excreted renally. - Therefore, it can be used safely in patients with **renal failure** without significant dose adjustment.
Question 2: All are cardiovascular system changes in pregnancy except.
- A. Increase in blood volume
- B. Increase in heart rate
- C. Increase in peripheral resistance (Correct Answer)
- D. Increase in cardiac output
Explanation: ***Increase in peripheral resistance*** - During normal pregnancy, **peripheral vascular resistance actually decreases** due to the effects of hormones like progesterone and the presence of the low-resistance uteroplacental circulation. - This decrease in resistance helps accommodate the increased blood volume and cardiac output. *Increase in cardiac output* - **Cardiac output increases significantly** during pregnancy (by 30-50%) to meet the metabolic demands of the growing fetus and maternal tissues. - This is primarily achieved through an increase in both stroke volume and heart rate. *Increase in blood volume* - **Blood volume increases substantially** (by 30-50%) during pregnancy, with plasma volume increasing more than red blood cell mass. - This expansion supports the increased cardiac output and placental perfusion. *Increase in heart rate* - **Heart rate increases** during pregnancy, typically by 10-20 beats per minute, contributing to the overall increase in cardiac output. - This physiological adaptation helps maintain adequate circulation.
Question 3: All of the following are indicators of adequacy of pre-operative resuscitation except
- A. Hematocrit level
- B. Consciousness level
- C. C-reactive protein level (Correct Answer)
- D. Urine output
Explanation: ***C-reactive protein level*** - **C-reactive protein (CRP)** is an inflammatory marker and is not a direct indicator of the adequacy of pre-operative fluid and hemodynamic resuscitation. An elevated CRP suggests ongoing inflammation or infection, not necessarily a deficit in perfusion or hydration. - While inflammation can coincide with critical illness requiring resuscitation, CRP itself does not provide real-time information about **organ perfusion**, **oxygen delivery**, or **fluid status**. *Hematocrit level* - **Hematocrit** levels are crucial for assessing factors like **blood loss** and **hemoconcentration**, which directly impact the need for and adequacy of resuscitation. An increasing hematocrit can indicate hemoconcentration, while a decreasing hematocrit may suggest blood loss. - It helps guide decisions regarding **blood product transfusions** and overall fluid management. *Consciousness level* - The **level of consciousness** is a vital clinical indicator of **cerebral perfusion** and overall brain oxygenation. Deterioration can signal inadequate resuscitation and poor cerebral blood flow. - Improvements in consciousness level after interventions suggest improved **systemic perfusion** and oxygen delivery to the brain. *Urine output* - **Urine output** is a sensitive and widely used indicator of **renal perfusion** and overall systemic hydration status. Adequate urine output (e.g., >0.5 mL/kg/hr) suggests sufficient renal blood flow. - Low or absent urine output can indicate **hypovolemia**, **poor cardiac output**, or **renal hypoperfusion**, highlighting the need for further resuscitation.
Question 4: Which of the following is not a risk factor for postoperative pulmonary complication?
- A. Normal BMI (18.5-24.9) (Correct Answer)
- B. Age 25-40 years
- C. Upper abdominal surgery
- D. Patient with 20 pack years of smoking
Explanation: ***Patient with 20 pack years of smoking*** - This is a significant risk factor for postoperative pulmonary complications, as **chronic smoking** impairs lung function and mucociliary clearance. - Patients with a history of **20 pack-years or more** are at a substantially increased risk of developing atelectasis, pneumonia, and respiratory failure after surgery. *Normal BMI (18.5-24.9)* - A **normal BMI** is not considered a risk factor for postoperative pulmonary complications; instead, it is associated with a lower risk compared to obesity or underweight states. - Patients with a normal BMI generally have **better respiratory mechanics** and lung volumes, reducing their susceptibility to pulmonary issues. *Age 25-40 years* - This age range is generally associated with a **lower risk** of postoperative pulmonary complications compared to very young or elderly patients. - Younger adults typically have **better physiological reserves** and healthier lungs, contributing to a reduced incidence of respiratory problems post-surgery. *Upper abdominal surgery* - **Upper abdominal surgery** is a significant risk factor for postoperative pulmonary complications due to its proximity to the diaphragm. - It often leads to **diaphragmatic dysfunction**, reduced lung volumes, and increased pain, all of which predispose patients to atelectasis and pneumonia.
Question 5: All of the following are physiological changes that occur during pregnancy, except which of the following?
- A. Decrease in renal plasma flow (Correct Answer)
- B. Increase in cardiac output
- C. Increase in glomerular filtration rate
- D. Increase in blood volume
Explanation: ***Decrease in renal plasma flow*** - This statement is incorrect because **renal plasma flow actually increases** significantly during pregnancy due to vasodilation. - The increased renal plasma flow contributes to the elevated **glomerular filtration rate** observed in pregnant women. *Increase in cardiac output* - **Cardiac output increases by 30-50%** during pregnancy to meet the metabolic demands of the growing fetus and maternal tissues. - This increase is primarily due to an increase in both **heart rate** and **stroke volume**. *Increase in glomerular filtration rate* - The **glomerular filtration rate (GFR) increases by 30-50%** during pregnancy, leading to increased renal clearance of waste products. - This physiologic change is partly due to the **increased renal plasma flow** and changes in renal hemodynamics. *Increase in blood volume* - **Blood volume increases by 30-50%** during pregnancy, with a proportionally greater increase in plasma volume compared to red blood cell mass. - This expansion in blood volume is crucial for meeting the demands of the uteroplacental circulation and protecting against hemorrhage during delivery.
Question 6: Uremic complications typically arise during which of the following phases of renal failure?
- A. Initiation
- B. Maintenance (Correct Answer)
- C. Diuretic Phase
- D. Recovery Phase
Explanation: ***Maintenance*** - During the **maintenance phase**, renal function is severely impaired, leading to the accumulation of **uremic toxins** and metabolic waste products. - This prolonged period of reduced kidney function is when **uremic complications** such as pericarditis, encephalopathy, and coagulopathy typically manifest. *Initiation* - The **initiation phase** is characterized by the initial insult to the kidneys and the onset of reduced glomerular filtration, but significant uremic complications are usually not yet apparent. - It is a period of evolving injury, and the body's compensatory mechanisms may still be able to mitigate acute toxicity. *Diuretic Phase* - The **diuretic phase** is a period of gradual improvement from renal failure, where urine output increases, but the kidneys may still have impaired ability to concentrate urine or fully excrete waste. - While electrolyte imbalances can occur, severe uremic complications are less common as renal function starts to recover. *Recovery Phase* - In the **recovery phase**, renal function gradually normalizes, and the kidneys regain their ability to excrete waste products effectively. - Uremic complications would typically be resolving, not arising, during this phase as **renal repair** takes place.
Question 7: In a village, every fifth house was selected for a study. This is an example of
- A. Simple random sampling
- B. Convenience sampling
- C. Systematic random sampling (Correct Answer)
- D. Stratified random sampling
Explanation: ***Systematic random sampling*** - This method involves selecting subjects from a **ordered sampling frame** at regular intervals, such as every k-th item. - In this scenario, selecting every fifth house represents a fixed interval (k=5), which is characteristic of systematic random sampling. *Simple random sampling* - This method ensures that every member of the population has an **equal chance of being selected**, often through random number generation. - It does not involve a predetermined, fixed interval of selection from an ordered list. *Convenience sampling* - This technique involves selecting subjects who are **easily accessible or readily available**, without any systematic or random process. - It is prone to bias as it does not represent the entire population. *Stratified random sampling* - This method involves dividing the population into **homogeneous subgroups (strata)** and then conducting simple random sampling within each stratum. - The scenario does not describe dividing the village households into distinct subgroups before selection.
Question 8: The commonest site of pressure sore is :
- A. Sacrum
- B. Heel (Correct Answer)
- C. Ischium
- D. Occiput
Explanation: ***Heel*** - The **heel** is a common site for pressure sore development, especially in bedridden or immobile patients, due to sustained pressure on the bony prominence. - While less common as the *most* common site compared to the sacrum, it is still very frequently affected and can be equally severe. *Sacrum* - The **sacrum** is the *most common site* for pressure ulcers, particularly in individuals who are bed-bound or spend prolonged periods in a supine position. - This area experiences high pressure when lying on the back due to the body's weight pressing down on the bony prominence of the sacrum [1]. *Ischium* - The **ischial tuberosities** are common sites for pressure sores in individuals who are wheelchair-bound or spend extended periods in a seated position. - Pressure on this area is particularly high when sitting, making it vulnerable to tissue damage. *Occiput* - The **occiput** (back of the head) is a common site for pressure sores in infants, critically ill patients, or individuals who are supine for extended periods and unable to reposition their heads. - This is due to sustained pressure on the bony prominence of the skull against the mattress or support surface.
Question 9: Kidney damage and Glomerular Filtration Rate (GFR) value between 15-29 mL / min / 1.73 m^2 are found in which stage of Chronic Kidney Disease?
- A. Stage 4 (severe) (Correct Answer)
- B. Stage 3A (mild to moderate)
- C. Stage 2 (mild)
- D. Stage 5 (kidney failure)
Explanation: ***Stage 4 (severe)*** - **Stage 4 Chronic Kidney Disease (CKD)** is defined by a **Glomerular Filtration Rate (GFR)** in the range of **15-29 mL/min/1.73 m²** [1]. - At this stage, significant kidney damage is present, indicating **severe reduction in kidney function** with increased risk of complications. *Stage 3A (mild to moderate)* - **Stage 3A CKD** is characterized by a **GFR** between **45-59 mL/min/1.73 m²**, which is a milder reduction compared to the GFR given in the question [1]. - This stage represents a **mild to moderate decrease** in kidney function, falling above the severe range. *Stage 2 (mild)* - **Stage 2 CKD** involves a **GFR** between **60-89 mL/min/1.73 m²**, which is a mild reduction in GFR but typically with persistent kidney damage. - This GFR range is significantly higher than the 15-29 mL/min/1.73 m² specified in the question, representing **earlier kidney dysfunction**. *Stage 5 (kidney failure)* - **Stage 5 CKD** is defined by a **GFR** of **less than 15 mL/min/1.73 m²**, indicating **kidney failure** requiring dialysis or kidney transplant [1]. - The given GFR range of 15-29 mL/min/1.73 m² is higher than that of Stage 5, although it is still considered a **very advanced stage of CKD**.
Question 10: A 50-year-old diabetic presents with a foot ulcer. Which pathogen is most likely?
- A. Staphylococcus aureus (Correct Answer)
- B. Escherichia coli
- C. Pseudomonas aeruginosa
- D. Candida albicans
Explanation: ***Staphylococcus aureus*** - **Staphylococcus aureus** is the most common pathogen isolated from **diabetic foot ulcers**, particularly in superficial infections [3]. - Its presence is often associated with the breakdown of the skin barrier common in diabetic patients, allowing bacterial entry [1]. *Escherichia coli* - **Escherichia coli** is more commonly associated with **gastrointestinal infections** or **urinary tract infections** [2]. - While it can be found in diabetic foot ulcers, especially deep or chronic ones, it is not the most frequent primary isolate. *Pseudomonas aeruginosa* - **Pseudomonas aeruginosa** is typically found in **chronic or previously treated ulcers**, or those exposed to water. - While a significant pathogen in this context, it is less common as the initial and sole causative agent compared to S. aureus. *Candida albicans* - **Candida albicans** is a **fungus**, and while fungal infections can occur in diabetic foot ulcers, they are usually secondary or coinfections, not the primary bacterial pathogen. - Its presence often indicates **immunocompromise** or prolonged antibiotic use.
Want unlimited practice?
Get full access to all questions, explanations, and performance tracking.
Start For Free