BACKGROUND: Our objective was to develop an animal model of postsurgical lymphedema that would permit quantitation of edema and lymphatic function after the removal of a single popliteal lymph node in sheep. METHODS: As a measure of lymph transport, (125)I-human serum albumin was injected into prenodal vessels at 8, 12 and 16 weeks after nodal excision, and plasma levels of the protein tracer were used to calculate the transport rate of the tracer to blood (percent injected per hour). Edema was quantified from the circumferential measurement of the hind limbs. RESULTS AND CONCLUSIONS: Following nodal excision, the limbs became progressively more edematous up to 3 days after nodectomy. After this, the swelling decreased but had not resolved even at 16 weeks after surgery. Compared with control limbs (17.2 +/- 0.6; n = 7), lymphatic function was depressed at 8 weeks after surgery (10.6 +/- 1.5; n = 7). At 12 (14.4 +/- 1.0; n = 7) and 16 weeks (13.9 +/- 1.0; n = 6), regeneration of lymphatic vessels at the excision site helped to restore about 80% of lymphatic capacity. These techniques may be helpful in understanding the pathophysiology associated with cancer-related postsurgical lymphedema and may facilitate the development of new strategies to treat or prevent this condition.
BACKGROUND: Our objective was to develop an animal model of postsurgical lymphedema that would permit quantitation of edema and lymphatic function after the removal of a single popliteal lymph node in sheep. METHODS: As a measure of lymph transport, (125)I-human serum albumin was injected into prenodal vessels at 8, 12 and 16 weeks after nodal excision, and plasma levels of the protein tracer were used to calculate the transport rate of the tracer to blood (percent injected per hour). Edema was quantified from the circumferential measurement of the hind limbs. RESULTS AND CONCLUSIONS: Following nodal excision, the limbs became progressively more edematous up to 3 days after nodectomy. After this, the swelling decreased but had not resolved even at 16 weeks after surgery. Compared with control limbs (17.2 +/- 0.6; n = 7), lymphatic function was depressed at 8 weeks after surgery (10.6 +/- 1.5; n = 7). At 12 (14.4 +/- 1.0; n = 7) and 16 weeks (13.9 +/- 1.0; n = 6), regeneration of lymphatic vessels at the excision site helped to restore about 80% of lymphatic capacity. These techniques may be helpful in understanding the pathophysiology associated with cancer-related postsurgical lymphedema and may facilitate the development of new strategies to treat or prevent this condition.
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Authors: Amy Baker; Harold Kim; John L Semple; Dan Dumont; Molly Shoichet; Dalia Tobbia; Miles Johnston Journal: Breast Cancer Res Date: 2010-09-08 Impact factor: 6.466
Authors: María Torres Lacomba; María José Yuste Sánchez; Alvaro Zapico Goñi; David Prieto Merino; Orlando Mayoral del Moral; Ester Cerezo Téllez; Elena Minayo Mogollón Journal: BMJ Date: 2010-01-12