Hematology — MCQs

Hematology Indian Medical PG Practice Questions and MCQs

Question 1081: Which of the following does not predispose to leukemia?

A. Smoking
B. Chemical exposure
C. Alcohol (Correct Answer)
D. Genetic disorder

Explanation: ***Alcohol*** - Alcohol consumption does not have a well-established association with an increased risk of leukemia compared to other factors. - While excessive alcohol can impact overall health, it is not considered a primary risk factor for developing leukemia. *Chemical exposure* - Certain chemicals, such as **benzene** and **formaldehyde**, are known to be **leukemogenic** and can increase the risk of leukemia. [1] - Occupational exposure to these chemicals has been linked to **acute myeloid leukemia (AML)** and other types of leukemia. [1] *Smoking* - Smoking has been clearly associated with an increased risk of **acute myeloid leukemia (AML)** and other hematologic malignancies. [1] - The toxins in tobacco smoke can cause **DNA damage**, contributing to the development of leukemia. *Genetic disorder* - Certain genetic disorders, like **Down syndrome** and **Fanconi anemia**, are associated with an increased risk of leukemia. - Individuals with these genetic predispositions have a higher likelihood of developing various forms of leukemia.

Question 1082: Which subtype of Acute Myeloid Leukemia (AML) is associated with the best prognosis?

A. Acute myelo monocytic leukemia.
B. Acute monocytic leukemia.
C. Erythro leukemia
D. Acute promyeloblastic leukemia (M3) (Correct Answer)

Explanation: ***Acute promyeloblastic leukemia (M.3)*** [1] - **Best prognosis** in acute myeloid leukemia (AML) is associated with acute promyeloblastic leukemia due to its responsiveness to **all-trans retinoic acid (ATRA)** treatment. [1] - This type often presents with a **prominent coagulopathy**, but successful treatment can lead to **long-term remission**. *Acute monocytic leukemia* - Generally associated with **poor prognosis** and is characterized by a high white blood cell count and organ infiltration. - It lacks the favorable features seen in acute promyeloblastic leukemia, such as effective treatment outcomes. *Erythroleukemia* - Known for having a **poor prognosis** due to its aggressive nature and frequent association with complex chromosomal abnormalities. [1] - Treatment responses are often suboptimal compared to that of acute promyeloblastic leukemia. *Acute myelomonocytic leukemia* - Typically has an **intermediate prognosis** [1] and presents with a mixture of myeloid and monocytic features. - It does not have the same treatment responsiveness and favorable outcomes as seen in acute promyeloblastic leukemia.

Question 1083: What does ristocetin testing indicate in von Willebrand disease?

A. Normal agglutination
B. Increased agglutination
C. No agglutination
D. Decreased agglutination (Correct Answer)

Explanation: ***Decreased agglutination*** - In von Willebrand disease, **ristocetin induces less agglutination** due to a deficiency or dysfunction of von Willebrand factor. - This results in **impaired platelet adhesion** [1], crucial for effective hemostasis. *Increased agglutination* - Would suggest an increased platelet interaction, which is **not characteristic of von Willebrand disease**. - It can occur in conditions with enhanced von Willebrand factor, unlike in this case. *No agglutination* - Suggests complete lack of platelet interaction, which is **not typical** in von Willebrand disease. - There is often some level of interaction, albeit reduced, not a total absence of agglutination. *Normal agglutination* - Indicates no abnormalities, which **contradicts the known pathology** of von Willebrand disease. - Patients typically demonstrate decreased levels of agglutination, not normal findings in this test.

Question 1084: Which antibody is primarily associated with warm autoimmune hemolytic anemia (AIHA)?

A. IgE
B. IgM
C. IgG (Correct Answer)
D. IgD

Explanation: ***IgG*** - **Warm autoimmune hemolytic anemia (AIHA)** is primarily associated with **IgG antibodies**, which mediate hemolysis at body temperature [1]. - IgG antibodies typically bind to red blood cells and lead to their destruction by the **reticuloendothelial system** [1]. *IgM* - Often involved in **cold agglutinin disease**, not warm AIHA, as it primarily reacts at lower temperatures [2]. - Usually results in **hemolysis** in peripheral areas, like the extremities, rather than at normal body temperature [2]. *IgD* - Known primarily as a marker on **B cells**, it plays a minimal role in hemolytic anemia and is not involved in antibody-mediated hemolysis. - Lack of significant **serological presence** in autoimmune hemolytic processes makes it an unlikely candidate. *IgE* - Primarily associated with **allergic reactions** and parasitic infections rather than autoimmune hemolytic conditions [2]. - Does not typically participate in **hemolysis** or bind to red blood cells in AIHA.

Question 1085: Which of the following is not classified as a cutaneous porphyria?

A. Congenital erythropoietic porphyria
B. Erythropoietic protoporphyria
C. Sideroblastic anemia (Correct Answer)
D. Hereditary coproporphyria

Explanation: ***Hereditary coproporphyria*** - This condition is primarily associated with **acute episodes** and **neuropathy**, rather than cutaneous manifestations. [2] - Unlike cutaneous porphyrias, symptoms are more systemic and do not commonly present with **skin lesions**. Although skin features can occur in some instances, they mimic porphyria cutanea tarda. [2] *Congenital erythropoeitic porphyria* - Characterized by severe **cutaneous symptoms** such as blistering and photosensitivity due to **skin exposure**. - Patients exhibit notable **facial disfigurement** and can have **hemolytic anemia**, aligning it clearly with the cutaneous forms of porphyria. *Sideroblastic anemia* - This condition involves issues with **hemoglobin synthesis** and does not fit the porphyria classification. [1] - It primarily presents with **microcytic anemia**, and the symptoms are primarily hematological, not cutaneous. [1] *Erythropoeitic porphyria* - Characterized by **severe photosensitivity** and skin manifestations, similar to congenital erythropoeitic porphyria. [1] - Patients may develop **blisters** and **hyperpigmentation** upon sun exposure, categorizing it among cutaneous porphyrias. [2]

Question 1086: Pagophagia is associated with the consumption of which substance?

A. Ice (Correct Answer)
B. Sand
C. Clay
D. Salt

Explanation: ***Ice*** - **Pagophagia** is the compulsive consumption of **ice**, ice water, or iced beverages. - It is a specific form of **pica** [1] and is often associated with **iron deficiency anemia**. *Sand* - The compulsive consumption of **sand** is known as **geophagia**, a form of pica [1]. - It is not directly termed "pagophagia." *Clay* - The compulsive consumption of **clay** is also a form of **geophagia** [1]. - This term distinguishes it from the consumption of ice. *Salt* - While excessive salt intake can be a craving, it is not referred to as **pagophagia**. - Salt cravings can sometimes indicate certain electrolyte imbalances but are distinct from **pica** presentations like pagophagia [1].

Question 1087: Deep vein thrombosis most commonly occurs at which site?

A. Femoral vein (Correct Answer)
B. Subclavian vein
C. External jugular vein
D. Internal jugular vein

Explanation: ***Femoral vein*** - The **femoral vein**, along with the **popliteal** and **iliac veins**, are the most common sites for **deep vein thrombosis (DVT)** in the lower extremities [1]. - Due to their size and the dynamics of blood flow in these regions, they are prone to clot formation, especially in the presence of **Virchow's triad**. *Subclavian vein* - While DVT can occur in the subclavian vein (an **upper extremity DVT**), it is less common than in the lower extremities [1]. - Upper extremity DVTs are often associated with **central venous catheters** or **thoracic outlet syndrome**. *External jugular vein* - **External jugular vein thrombosis** is rare and usually associated with local trauma, infection, or central line placement, not typically primary DVT [1]. - It is a superficial vein and not considered a common site for typical deep vein thrombosis. *Internal jugular vein* - **Internal jugular vein thrombosis** is also uncommon as a primary DVT and often secondary to neck infections, malignancies, or indwelling catheters [1]. - Like the subclavian vein, it's considered an upper extremity DVT site, but less frequent than lower extremity sites.

Question 1088: What is the recommended time frame for completing a blood transfusion after initiation?

A. 1-4 hours (Correct Answer)
B. 3-6 hours
C. 4-8 hours
D. 8-12 hours

Explanation: ***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**.

Question 1089: Which of the following conditions is associated with megaloblastic anemia?

A. Pernicious anemia (Correct Answer)
B. Iron deficiency anemia
C. Intestinal lymphatic ectasia
D. Chronic kidney disease

Explanation: a and b - Megaloblastic anemia is commonly associated with **vitamin B12** [1] and **folate deficiencies** [2], which can occur due to various causes. - Conditions leading to malabsorption (such as those related to the gastrointestinal tract) contribute significantly to megaloblastic anemia [1, 2]. *ileal resection* - Ileal resection can indeed lead to **malabsorption** of vitamin B12 [1], particularly if the distal ileum is removed. - However, it is important to note that megaloblastic anemia specifically reflects a broader range of potential deficiencies, thus it is not an exclusive answer. *Crohn's disease* - Crohn's disease can cause **malabsorption** and result in vitamin B12 deficiency but is not a direct cause of megaloblastic anemia on its own. - The anemia may occur due to complications like **ileo-pouch anastomosis** rather than the disease itself. *Intestinal lymphatic ectasia* - This condition leads to **protein-losing enteropathy**, potentially causing deficiencies but not specifically leading to megaloblastic anemia. - The anemia associated with this condition is typically due to **hypoalbuminemia** and not a result of any vitamin deficiency directly.

Question 1090: Which of the following is commonly seen in Polycythemia Vera?

A. Hyperuricemia
B. Prone for acute leukemia
C. Spontaneous severe infection
D. Thrombosis (Correct Answer)

Explanation: ***Spontaneous severe infection*** - In Polycythemia Vera, there is usually an **increased red blood cell mass** leading to complications like thrombosis, rather than a predisposition to severe infections. - Severe infections are not a typical feature, as the condition usually maintains **functional immunity** despite hyperviscosity. *Thrombosis* - Individuals with Polycythemia Vera have increased blood viscosity that results in a higher risk of **thrombosis**, which is a common complication [1]. - Events like **deep vein thrombosis (DVT)** or **cerebral venous sinus thrombosis** are often observed due to altered hemodynamics. *Hyperuricemia* - Hyperuricemia occurs due to increased cell turnover and breakdown of red cells in Polycythemia Vera, leading to elevated **uric acid levels** [1]. - Patients may experience **gout attacks** as a consequence of this elevated uric acid [1]. *Prone for acute leukemia* - While there is an increased risk of transformation to myeloid neoplasms, the risk for **acute leukemia** is not directly attributed to Polycythemia Vera in most cases. - It is more related to myelofibrosis or secondary conditions developing over time rather than a direct association.

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Anemia Evaluation and Management

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Hemoglobinopathies

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Thalassemias

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Platelet Disorders

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Coagulation Disorders

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Thrombotic Disorders

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Leukemias

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Lymphomas

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Multiple Myeloma and Plasma Cell Disorders

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Myeloproliferative Neoplasms

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Transfusion Medicine

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Hematopoietic Stem Cell Transplantation

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Hematology — MCQs

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