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

Dynamic insufficiency occurs when the lymphatic load is abnormally elevated (e.g., from cardiac or renal edema) and exceeds even normal lymphatic transport capacity, without structural lymphatic damage.

Question 2

What is 'mechanical insufficiency' of the lymphatic system?

Accepted Answer

Reduced lymphatic transport capacity due to structural damage or obstruction

Answer

Mechanical insufficiency refers to reduced lymphatic transport capacity caused by structural damage such as node removal, radiation fibrosis, or congenital abnormality, which is the underlying cause of true lymphedema.

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

Approximately 10–20% of net capillary filtrate is not reabsorbed directly into capillaries and must be returned to circulation via the lymphatic system, carrying protein and large molecules.

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

Chronic protein accumulation stimulates an inflammatory response that activates fibroblasts via cytokines like TGF-β, resulting in progressive collagen deposition and irreversible tissue fibrosis.

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

ISL Stage 0 represents a latent or subclinical phase in which lymphatic transport is impaired and symptoms such as heaviness may occur, but no visible or measurable swelling is present yet.

CLT - Certified Lymphedema Therapist Practice Test

CLT - Certified Lymphedema Therapist Practice Test

CLT Pathophysiology of Lymphedema 3