An acute condition characterized by diminished production and increased destruction of RBC, triggered by viral infection or folic acid deficiency is?

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2016

Explanation

The question describes acute crises that occur in the context of chronic hemolytic anemia, a condition defined by the premature destruction of red blood cells (RBCs).
The triggers mentioned correspond to specific crises: viral infections (like Parvovirus B19) cause aplastic crisis by halting RBC production in the bone marrow.
Folic acid deficiency causes megaloblastic crisis because the high RBC turnover in hemolytic states depletes folate, which is essential for new RBC production.
In both scenarios, a sudden 'diminished production' is superimposed on the baseline 'increased destruction,' leading to a severe, acute drop in hemoglobin.

Option B: Thalassemia is a specific type of inherited hemolytic anemia. While a person with thalassemia can experience the aplastic or megaloblastic crises described, 'Hemolytic anemia' is the broader and more accurate category that encompasses the general process.
Option C: Leukemia is a cancer of the blood-forming tissues, primarily affecting white blood cells. While it can cause anemia by suppressing normal bone marrow function, its primary mechanism and triggers are different from the specific combination described in the question.
Option D: Multiple sclerosis is an autoimmune disease that affects the central nervous system (brain and spinal cord). It is completely unrelated to red blood cell production or destruction.

Clinical Relevance

Nursing practice connection: Knowing Pathophysiology of crises in hemolytic anemia helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses must recognize that patients with chronic hemolytic anemias (e.g., sickle cell disease, thalassemia) are at high risk for these acute crises.
A sudden increase in pallor, extreme fatigue, and shortness of breath in such a patient should prompt immediate investigation for an aplastic or megaloblastic crisis.
Monitoring the reticulocyte count is crucial. In an aplastic crisis, the reticulocyte count will be very low, indicating a failure of bone marrow production.

How to Approach the Question

First, dissect the question stem to identify the key features: an acute condition involving both 'increased destruction' and 'diminished production' of RBCs.
Note the specific triggers provided: 'viral infection' and 'folic acid deficiency'.
Evaluate the options. 'Increased destruction of RBCs' is the definition of hemolysis, making 'Hemolytic anemia' a primary candidate.
Connect the triggers to known complications. Viral infections (especially Parvovirus B19) are known to cause aplastic crises (production failure) in patients with hemolytic conditions.
Similarly, recognize that the high cell turnover in hemolytic anemia increases the demand for folic acid, and a deficiency can lead to a megaloblastic crisis (production failure).
Conclude that the question is describing acute crises superimposed on a chronic hemolytic state. Therefore, 'Hemolytic anemia' is the best-fitting answer among the choices.

Concept Tested & Keywords

Concept Tested: Pathophysiology of crises in hemolytic anemia.
Stem keywords: acute condition, diminished production, increased destruction of RBC, viral infection, folic acid deficiency
Lead-in keywords: is
Negative lead-in flag: false

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E6 Physiology Essentials Sembulingam 10e Part 1 pp. 104-106, 103-105

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 1128-1130

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