NEET-PG 2013 Practice Questions

Q: In which vein is Central Venous Pressure (CVP) most accurately monitored?

Internal jugular vein. ***Internal jugular vein*** - The **internal jugular vein** provides the **most direct and consistent access** to the superior vena cava and right atrium, where CVP is accurately measured. - Its straight course and reliable anatomical landmarks make it a preferred site for CVP catheter insertion. *Anterior jugular vein* - The **anterior jugular vein** is smaller and often has a more tortuous course, making consistent and reliable CVP monitoring difficult. - It is not typically chosen for central venous access due to its anatomical variability and smaller caliber. *External jugular vein* - The **external jugular vein** is superficially located and easier to access but often has valves and a more oblique angle to the subclavian vein, making catheter advancement to the central circulation challenging. - Catheter tip placement is less consistent for accurate CVP measurements compared to the internal jugular vein. *Inferior vena cava* - While the **inferior vena cava** eventually drains into the right atrium, access is typically via the femoral vein, which is associated with a higher risk of infection and deep vein thrombosis for long-term CVP monitoring. - Measurements from the inferior vena cava or femoral vein can be affected by **intra-abdominal pressure** and are not as accurately reflective of right atrial pressure as those from the superior vena cava.

Q: Central venous monitoring is typically used for all of the following except:

Administering thrombolytics. ***Administering thrombolytics*** - Central venous monitoring is a technique used to measure central venous pressure (CVP), which reflects right atrial pressure and indirectly **right ventricular preload**. It does not directly relate to the administration of **thrombolytics**. - Thrombolytics are typically administered intravenously through a peripheral or central line to dissolve clots, but CVP monitoring is not a prerequisite or a direct function of this administration. *Regulating the speed and amount of fluid infusion* - **Central venous pressure (CVP)** monitoring is crucial for assessing a patient's **fluid status** and guiding fluid resuscitation. - By continuously monitoring CVP, clinicians can determine whether to increase, decrease, or maintain the rate of **fluid infusion** to optimize cardiac preload without causing fluid overload. *Deciding the need for plasma infusion* - CVP values help assess **circulatory volume** and guide decisions on fluid replacement, including the need for **plasma infusion** in conditions like severe hypovolemia or coagulopathy. - A low CVP in a patient with bleeding or coagulation issues might indicate the need for volume expansion with **plasma**. *Deciding the requirement for blood transfusion* - **Low CVP** can indicate **hypovolemia**, which might be due to blood loss, thereby suggesting the need for a **blood transfusion**. - While not the sole determinant, CVP is one of several physiological parameters used to assess the urgency and amount of **blood products** required to restore circulating volume and oxygen-carrying capacity.

Q: What is the best immediate management strategy for a patient experiencing respiratory alkalosis due to anxiety-induced hyperventilation?

Rebreathing in paper bag. ***Rebreathing in paper bag*** - This helps to **increase the inspired CO2 concentration**, thereby correcting the hypocapnia (low CO2) caused by hyperventilation. - It's a simple, non-invasive method to raise arterial PCO2 and normalize blood pH in acute respiratory alkalosis. *IPPV* - **Intermittent positive pressure ventilation (IPPV)** would further reduce CO2 by assisting ventilation and is typically used for respiratory *acidosis* or failure [1]. - This intervention would worsen the patient's respiratory alkalosis rather than alleviating it. *Normal saline* - **Normal saline** administration is primarily used for volume expansion or to correct electrolyte imbalances; it does not directly address respiratory alkalosis. - It would not correct the underlying issue of excessive CO2 exhalation. *Acetazolamide* - **Acetazolamide** is a carbonic anhydrase inhibitor that reduces bicarbonate reabsorption and is used to treat metabolic alkalosis or as a diuretic. - It would not be an immediate or appropriate solution for acute respiratory alkalosis and might even worsen the acid-base balance if used improperly.

Q: Adrenal reserve is best tested by means of infusion with

ACTH. ACTH - The **ACTH stimulation test**, also known as the **cosyntropin test**, is the most common dynamic test for assessing adrenal reserve. - Exogenous ACTH (cosyntropin) stimulates the adrenal glands to produce cortisol; a subnormal response indicates adrenal insufficiency. *Corticosteroids* - **Corticosteroids** are hormones (like cortisol) produced by the adrenal glands, or synthetic versions used as medications; they do not test adrenal reserve but rather *replace* adrenal function. - Administering corticosteroids would interfere with, rather than assess, the adrenal gland's ability to produce its own hormones. *LHRH* - **Luteinizing hormone-releasing hormone (LHRH)** is used to assess the function of the anterior pituitary gland and gonads, not the adrenal glands. - An LHRH stimulation test evaluates the pituitary's ability to release LH and FSH, which in turn stimulate gonadal hormone production. *Metyrapone* - The **metyrapone test** assesses the integrity of the **hypothalamic-pituitary-adrenal axis** by blocking cortisol synthesis, which should lead to an increase in ACTH and 11-deoxycortisol [1]. - While it evaluates a part of adrenal function, it is primarily used to differentiate between primary and secondary adrenal insufficiency, and not a direct measure of cortisol production capacity in response to stimulation.

Q: What is the recommended time frame for completing a blood transfusion after initiation?

1-4 hours. ***1-4 hours*** - This timeframe is recommended to **minimize the risk of bacterial growth** in the blood product, as bacteria can multiply quickly at room temperature. - Completing the transfusion within 4 hours also reduces the likelihood of **red blood cell degeneration** and loss of efficacy. *3-6 hours* - This period extends beyond the recommended maximum of 4 hours, increasing the risk of **bacterial proliferation** in the blood product. - Prolonged infusion times can also lead to a **decrease in the viability and function** of transfused cells. *4-8 hours* - Transfusing over 4-8 hours significantly elevates the risk of **bacterial contamination** and potential septic reactions. - The extended duration compromises the **quality and safety** of the blood product. *8-12 hours* - This timeframe is unacceptably long for a blood transfusion, posing a **critical risk of severe bacterial growth** and infection. - Blood products should not be administered beyond 4 hours due to the rapid decline in **cell integrity and increased adverse reaction potential**.

Q: What is the recommended rate of correction for sodium deficit in patients with chronic hyponatremia?

0.5 mmol/hour. ***0.5 mmol/hour*** [1] - This rate of correction is recommended to avoid **osmotic demyelination syndrome (ODS)**, also known as central pontine myelinolysis [1]. - The aim is to correct the sodium deficit gradually, with a maximum increase not exceeding **8-10 mmol/L in any 24-hour period** [1]. *1 mmol/hour* - This rate is generally considered too rapid for chronic hyponatremia and increases the risk of **osmotic demyelination syndrome**. - While acceptable in some acute severe cases, it is typically avoided in chronic settings where the brain has adapted to lower osmolality. *1.5 mmol/hour* - This rate would lead to an even faster correction of sodium, significantly elevating the risk of **osmotic demyelination syndrome**. - It would result in a correction of 36 mmol/L over 24 hours, far exceeding the recommended daily limit of 8-10 mmol/L. *2.0 mmol/hour* - Such a rapid correction rate is highly dangerous and almost guarantees the development of **osmotic demyelination syndrome**. - This aggressive correction would lead to severe brain injury due to rapid osmotic shifts.

Q: Graham Steell murmur is associated with which of the following conditions?

Pulmonary Regurgitation (PR). ***Pulmonary Regurgitation (PR)*** - The **Graham Steell murmur** is a high-pitched, decrescendo early diastolic murmur heard best at the left sternal border associated with **pulmonary hypertension**. [1] - It results from dilation of the pulmonary artery due to **elevated pulmonary pressures**, leading to functional pulmonary valve regurgitation. [1] *Tricuspid Regurgitation (TR)* - TR typically presents as a **holosystolic murmur** best heard at the left lower sternal border, often increasing with inspiration (Carvallo's sign). - It is caused by improper coaptation of the tricuspid valve leaflets, often due to **right ventricular dilation**. *Tricuspid Stenosis (TS)* - TS is characterized by a **diastolic rumble** heard best at the lower left sternal border, often with an opening snap. [2] - It is relatively rare and often associated with **rheumatic heart disease**. *Pulmonary Stenosis (PS)* - PS typically produces a **systolic ejection murmur** heard at the upper left sternal border, often radiating to the back. - It is caused by **obstruction to blood flow** from the right ventricle to the pulmonary artery.

Q: The most common translocation seen in patients with Multiple Myeloma is:

t(11;14). ***t(11;14)*** - This translocation is the **most common cytogenetic abnormality** found in patients with multiple myeloma, occurring in approximately 15-20% of cases. - It results in the juxtaposition of the **IgH gene on chromosome 14** with the **cyclin D1 gene on chromosome 11**, leading to overexpression of cyclin D1. *t(4;14)* - This translocation, occurring in about 5-10% of patients, is associated with a **poor prognosis** in multiple myeloma. - It involves the IgH gene on chromosome 14 and the **FGFR3 and MMSET genes on chromosome 4**, leading to their upregulation. *t(14;16)* - This translocation is also associated with a **poor prognosis** and is less common than t(11;14) or t(4;14), found in about 2-5% of cases. - It involves the **IgH gene on chromosome 14** and the **c-MAF gene on chromosome 16**, leading to overexpression of c-MAF. *t(14;20)* - This translocation is **rarely observed** in multiple myeloma patients, typically occurring in less than 1% of cases. - It involves the **IgH gene on chromosome 14** and the **MAFB gene on chromosome 20**, which can also contribute to disease progression.

Q: What is the drug of choice for managing generalized tonic-clonic seizures (GTCS) during pregnancy?

Lamotrigine. ***Lamotrigine*** - **Lamotrigine** is considered **one of the preferred drugs** for managing epilepsy during pregnancy due to its relatively **low teratogenic risk** compared to older antiepileptic drugs. - Its established safety profile in pregnancy makes it a preferred option to balance seizure control and **fetal well-being**. - **Important Note:** For **GTCS specifically**, lamotrigine and levetiracetam are both considered appropriate first-line choices, with selection depending on individual patient factors and seizure control history. - Lamotrigine levels **decrease during pregnancy** and require monitoring and dose adjustments. *CBZ* - **Carbamazepine (CBZ)** is associated with an increased risk of **neural tube defects** and other congenital malformations when used during pregnancy, making it less favorable. - While effective for GTCS, its teratogenicity often leads to avoidance or careful consideration of alternatives in pregnant women. *Levetiracetam* - **Levetiracetam** is increasingly recognized as an **excellent choice for GTCS in pregnancy** with a favorable safety profile and growing evidence base. - Many recent guidelines and clinical practices favor levetiracetam as **first-line for GTCS** due to its low risk of major congenital malformations and good efficacy. - It is a **medically appropriate alternative** to lamotrigine, and in some contexts may be preferred, particularly for primary generalized epilepsy. *Valproate* - **Valproate** has the highest risk of **teratogenicity** among common antiepileptic drugs, including a significant risk of **neural tube defects**, developmental delay, autism spectrum disorder, and other anomalies. - Due to these significant risks, valproate is generally **contraindicated** in women of childbearing potential, especially during pregnancy, unless no other effective and safer alternative exists.

Q: The most accurate investigation for assessing ventricular function is:

MRI. ***MRI*** - Cardiac MRI is considered the **gold standard** for assessing ventricular function, providing highly accurate and reproducible measurements of **ventricular volumes**, **ejection fraction**, and **myocardial mass**. - It offers excellent tissue characterization, allowing for direct visualization of **fibrosis**, **inflammation**, and other myocardial pathologies that can affect function. *Multislice CT* - While useful for assessing cardiac anatomy, particularly **coronary arteries**, Multislice CT involves **ionizing radiation** and has limitations in accurately assessing subtle changes in myocardial function compared to MRI. - Its strength lies more in **anatomical evaluation** (e.g., calcium scoring, coronary angiography) rather than detailed functional assessment. *Echocardiography* - Echocardiography is a widely available and useful first-line imaging modality for ventricular function, but it can be limited by **acoustic windows**, **operator dependency**, and **spatial resolution** compared to MRI. - While it provides good estimates of ejection fraction, particularly in simple cases, its 3D capabilities and tissue characterization are generally inferior to MRI. *Nuclear scan* - Nuclear scans (e.g., MUGA scans, SPECT) can assess ventricular function and myocardial perfusion, but they involve **ionizing radiation** and primarily provide **functional information** based on tracer uptake, not detailed structural or tissue characterization. - They are often used for evaluating **perfusion defects** and overall ejection fraction, but are less precise for detailed chamber quantification and tissue characterization than MRI.

Question 1

In which vein is Central Venous Pressure (CVP) most accurately monitored?

Accepted Answer

Internal jugular vein

Answer

Anterior jugular vein

Answer

External jugular vein

Answer

Inferior vena cava

Question 2

Central venous monitoring is typically used for all of the following except:

Accepted Answer

Administering thrombolytics

Answer

Deciding the need for plasma infusion

Answer

Deciding the requirement for blood transfusion

Answer

Regulating the speed and amount of fluid infusion

Question 3

What is the best immediate management strategy for a patient experiencing respiratory alkalosis due to anxiety-induced hyperventilation?

Accepted Answer

Rebreathing in paper bag

Answer

IPPV

Answer

Normal saline

Answer

Acetazolamide

Question 4

Adrenal reserve is best tested by means of infusion with

Accepted Answer

ACTH

Answer

Metyrapone

Answer

Corticosteroids

Answer

LHRH

Question 5

What is the recommended time frame for completing a blood transfusion after initiation?

Accepted Answer

1-4 hours

Answer

3-6 hours

Answer

4-8 hours

Answer

8-12 hours

Question 6

What is the recommended rate of correction for sodium deficit in patients with chronic hyponatremia?

Accepted Answer

0.5 mmol/hour

Answer

1 mmol/hour

Answer

1.5 mmol/hour

Answer

2.0 mmol/hour

Question 7

Graham Steell murmur is associated with which of the following conditions?

Accepted Answer

Pulmonary Regurgitation (PR)

Answer

Tricuspid Regurgitation (TR)

Answer

Tricuspid Stenosis (TS)

Answer

Pulmonary Stenosis (PS)

Question 8

The most common translocation seen in patients with Multiple Myeloma is:

Accepted Answer

t(11;14)

Answer

t(14;16)

Answer

t(4;14)

Answer

t(14;20)

Question 9

What is the drug of choice for managing generalized tonic-clonic seizures (GTCS) during pregnancy?

Accepted Answer

Lamotrigine

Answer

CBZ

Answer

Levetiracetam

Answer

Valproate

Question 10

The most accurate investigation for assessing ventricular function is:

Accepted Answer

MRI

Answer

Multislice CT

Answer

Echocardiography

Answer

Nuclear scan

NEET-PG 2013

Anesthesiology

Internal Medicine

Pathology

Pharmacology

Radiology