Physiological anaemia during pregnancy is a result of:

JIPMER Nursing Officer-2024

Obstetrics & Gynaecology

Medium

Appeared in: JIPMER Nursing Officer-2024

Explanation

Physiological anemia of pregnancy is a direct consequence of hemodilution, a normal adaptive process.
During pregnancy, the plasma volume expands significantly more (by about 40-50%) than the red blood cell mass (which increases by about 20-30%).
This disproportionate increase in the fluid component of blood dilutes the red blood cells, leading to a lower hemoglobin concentration and hematocrit value per unit of volume.
This is a physiological adaptation to meet the increased circulatory demands of the mother and fetus, and it is not a pathological condition.

Option B: Decreased dietary intake, particularly of iron and folate, causes pathological anemia (e.g., iron-deficiency anemia), not the normal physiological anemia of pregnancy.
Option C: This statement is factually wrong. Erythropoiesis (red blood cell production) is stimulated by erythropoietin and actually increases during pregnancy to raise the total red cell mass.
Option D: While the liver's metabolic and detoxification functions are altered during pregnancy, this process is not related to the mechanism of hemodilution that causes physiological anemia.

Visual 1: Graph - A line graph comparing the percentage increase of plasma volume versus red blood cell mass across the three trimesters of pregnancy. The graph should clearly show the plasma volume line rising much more steeply than the red cell mass line, illustrating the concept of hemodilution.
Visual 2: Infographic - A side-by-side comparison of two blood vials. The 'Non-Pregnant' vial shows a normal hematocrit level (e.g., 40% cells, 60% plasma). The 'Pregnant' vial shows a lower hematocrit (e.g., 33% cells, 67% plasma), visually demonstrating the dilutional effect.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Physiological anemia of pregnancy as background academic context rather than a clinical decision trigger.
It is crucial for nurses to differentiate physiological anemia from pathological anemia. While a slight drop in hemoglobin is normal, values below 11 g/dL in the first or third trimester (or 10.5 g/dL in the second) require further investigation for causes like iron deficiency.
Patient education is key. Nurses should explain to expectant mothers that this change is a normal part of pregnancy and helps support the baby, while also reinforcing the importance of a balanced diet and prescribed supplements (like iron and folic acid) to prevent pathological anemia.
Accurate assessment of symptoms is vital. While mild fatigue can be normal, symptoms like severe fatigue, pallor, shortness of breath, or pica may indicate a more severe, pathological anemia that needs treatment.

How to Approach the Question

First, identify the key terms in the question: 'Physiological anaemia' and 'pregnancy'. The word 'physiological' is a major clue, indicating a normal body process, not a disease.
Recall the major physiological changes that occur in the circulatory system during pregnancy. The most dramatic change is a large increase in total blood volume.
Consider how this blood volume increases. Both the plasma (fluid) and the red blood cells increase, but not in equal proportions.
Remember the concept of hemodilution: plasma volume increases much more significantly (by ~50%) than the red blood cell mass (by ~20-30%).
This disproportionate increase means the red blood cells are suspended in a larger volume of fluid, leading to a lower concentration (anemia). This directly points to 'Increased blood volume' as the cause.
Evaluate the other options. 'Decreased dietary intake' leads to pathological anemia. 'Decreased erythropoiesis' is factually incorrect, as production increases. 'Liver detoxification' is not related to this specific hematological change.

Concept Tested & Keywords

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