CLT Pathophysiology of Lymphedema 3

Question 1

Which of the following best describes 'dynamic insufficiency' of the lymphatic system?

Accepted Answer

The lymphatic load exceeds normal transport capacity despite structurally intact lymphatics

Answer

The lymphatic transport capacity is reduced due to structural damage

Answer

The lymphatics fail due to fibrosis within the lymphatic vessels

Answer

Transport capacity is absent due to surgical removal of lymph nodes

Question 2

What is 'mechanical insufficiency' of the lymphatic system?

Accepted Answer

Reduced lymphatic transport capacity due to structural damage or obstruction

Answer

Excess fluid production overwhelms a structurally normal lymphatic system

Answer

Increased interstitial protein causing osmotic imbalance

Answer

Failure of the thoracic duct to drain into the subclavian vein

Question 3

Approximately what percentage of the net filtrate from capillaries is normally returned to circulation via the lymphatic system?

Accepted Answer

10–20%

Answer

5–10%

Answer

20–30%

Answer

40–50%

Question 4

How does chronic protein accumulation in lymphedematous tissue contribute to progressive fibrosis?

Accepted Answer

Accumulated protein triggers chronic inflammation and fibroblast activation, leading to collagen deposition

Answer

Protein directly cross-links collagen fibers without cellular involvement

Answer

High interstitial protein levels suppress TGF-β production, paradoxically causing fibrosis

Answer

Protein accumulation has no direct relationship to fibrosis development

Question 5

ISL Stage 0 (or Stage Ia) lymphedema is best described as which of the following?

Accepted Answer

Latent or subclinical state where transport is impaired but no visible swelling is present

Answer

Visible swelling with pitting that resolves with elevation

Answer

Moderate non-pitting edema without skin changes

Answer

Severe irreversible edema with fibrosis and skin breakdown

Question 6

Which of the following best explains why lymphedema is characterized by a higher protein content in the interstitial fluid compared to other forms of edema?

Accepted Answer

Lymphatic failure allows protein, which cannot re-enter blood capillaries, to accumulate in the tissue

Answer

Inflammation increases protein synthesis in lymphedematous tissue

Answer

Kidney disease leads to protein leakage into the interstitium

Answer

Lymphedema uniquely activates local protein-producing fibroblasts

Question 7

Which term describes the end-stage manifestation of severe chronic lymphedema characterized by massive limb enlargement, skin hyperkeratosis, and papillomatous skin changes?

Accepted Answer

Lymphostatic elephantiasis

Answer

Lipedema

Answer

Phlebolymphedema

Answer

Angiosarcoma