Most common cause of unilateral pedal edema in India is?

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2021

Explanation

Filarial lymphedema, caused by the parasitic worm Wuchereria bancrofti, is the most common cause of secondary lymphedema worldwide and is endemic in India.
The parasite is transmitted by mosquitoes and obstructs the lymphatic system, leading to chronic unilateral swelling, most often in the lower limbs.
The high prevalence of lymphatic filariasis in India makes it the most common cause of unilateral pedal edema compared to other options.

Option A: While trauma can cause lymphedema if lymphatic vessels are damaged, it is not the most common cause at a population level, especially when compared to an endemic infectious disease like filariasis.
Option B: Lymphedema following radiation therapy is a known complication of cancer treatment but is noted to be a more common cause in developed countries. In India, its incidence is significantly lower than that of filariasis.
Option C: Milroy's disease is a rare, inherited condition that causes primary lymphedema, typically present at birth or in early infancy. Its rarity makes it an incorrect choice for the 'most common' cause.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Etiology of Unilateral Pedal Edema in India as background academic context rather than a clinical decision trigger.
Nurses in India play a vital role in public health initiatives for Mass Drug Administration (MDA) to eliminate lymphatic filariasis.
Patient education on limb hygiene, elevation, and protection from injury is a cornerstone of nursing care to prevent debilitating secondary infections and progression to elephantiasis.
Recognizing the early signs of lymphedema allows for timely intervention, which can significantly improve patient outcomes and quality of life.

How to Approach the Question

First, identify the key phrases in the question: 'most common cause', 'unilateral pedal edema', and the critical geographical context, 'in India'.
The qualifier 'in India' strongly suggests that the answer is related to a condition that is highly prevalent or endemic in that specific region.
Evaluate each option based on its general prevalence and its specific prevalence in India.
Recall or deduce that Filarial lymphedema (also known as elephantiasis) is a major, mosquito-borne public health problem in India and other tropical nations.
Contrast this with the other options: Milroy's disease is rare and congenital; post-traumatic and post-irradiation causes are specific to individual circumstances and not as widespread as an endemic disease.
Conclude that Filarial lymphedema is the most logical answer for the 'most common' cause in the given context.

Concept Tested & Keywords

Concept Tested: Etiology of Unilateral Pedal Edema in India
Stem keywords: unilateral pedal edema, most common cause, India
Lead-in keywords: Most common
Clinical cues: The geographical location 'India' is a critical cue, pointing towards diseases endemic to the region.

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E6 Medicine Harrison 22e Part 2 p. 87-89

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