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Compliance of the normal and post-thrombotic calf.
J Cardiovasc Surg (Torino). 1995 Jun; 36(3):225-31.JC

Abstract

OBJECTIVE

In addition to degree of outflow obstruction and reflux and poor calf muscle pump function, vein wall compliance changes are important in understanding pathophysiology of venous disease. This study compares the pressure/volume relationship in post-thrombotic and healthy legs.

EXPERIMENTAL DESIGN

Prospective and comparative study.

SETTING

Vascular laboratory.

PARTICIPANTS

Investigations were performed on 24 apparently normal legs and 30 post-thrombotic limbs as confirmed by phlebography.

METHOD

Dorsal vein pressure and absolute calf volume decrease were recorded simultaneously during outflow form the leg after release of the cuff during venous occlusion air-plethysmography with and without reactive hyperemia. The slope of the pressure/volume outflow curve was calculated. In addition, the distensibility (= collapsibility) was determined as % volume decrease/mmHg. The popliteal and femoral vein diameters were measured in supine and erect position by ultrasound.

RESULTS

With and without induced hyperemia the mean slope coefficients of post-thrombotic legs were significantly higher (0.52 +/- 0.22 and 0.53 +/- 0.18) than in normal (0.15 +/- 0.10 and 0.29 +/- 0.11), i.e., the curve steeper since the calf was stiffer, less compliant. The degree of outflow obstruction and severity of skin changes did not affect the slope measurement substantially. Collapsibility during venous outflow was significantly less in post-thrombotic legs. The post-thrombotic veins were less distended on standing.

CONCLUSIONS

Post-thrombotic calves are less compliant than normal legs mainly due to less compliance of the vein wall, although theoretically reduced venous volume may contribute.

Authors+Show Affiliations

Dept of Surgery, United Arab Emirates University, Al-Ainn.No affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

7629205

Citation

Neglén, P, and S Raju. "Compliance of the Normal and Post-thrombotic Calf." The Journal of Cardiovascular Surgery, vol. 36, no. 3, 1995, pp. 225-31.
Neglén P, Raju S. Compliance of the normal and post-thrombotic calf. J Cardiovasc Surg (Torino). 1995;36(3):225-31.
Neglén, P., & Raju, S. (1995). Compliance of the normal and post-thrombotic calf. The Journal of Cardiovascular Surgery, 36(3), 225-31.
Neglén P, Raju S. Compliance of the Normal and Post-thrombotic Calf. J Cardiovasc Surg (Torino). 1995;36(3):225-31. PubMed PMID: 7629205.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Compliance of the normal and post-thrombotic calf. AU - Neglén,P, AU - Raju,S, PY - 1995/6/1/pubmed PY - 1995/6/1/medline PY - 1995/6/1/entrez SP - 225 EP - 31 JF - The Journal of cardiovascular surgery JO - J Cardiovasc Surg (Torino) VL - 36 IS - 3 N2 - OBJECTIVE: In addition to degree of outflow obstruction and reflux and poor calf muscle pump function, vein wall compliance changes are important in understanding pathophysiology of venous disease. This study compares the pressure/volume relationship in post-thrombotic and healthy legs. EXPERIMENTAL DESIGN: Prospective and comparative study. SETTING: Vascular laboratory. PARTICIPANTS: Investigations were performed on 24 apparently normal legs and 30 post-thrombotic limbs as confirmed by phlebography. METHOD: Dorsal vein pressure and absolute calf volume decrease were recorded simultaneously during outflow form the leg after release of the cuff during venous occlusion air-plethysmography with and without reactive hyperemia. The slope of the pressure/volume outflow curve was calculated. In addition, the distensibility (= collapsibility) was determined as % volume decrease/mmHg. The popliteal and femoral vein diameters were measured in supine and erect position by ultrasound. RESULTS: With and without induced hyperemia the mean slope coefficients of post-thrombotic legs were significantly higher (0.52 +/- 0.22 and 0.53 +/- 0.18) than in normal (0.15 +/- 0.10 and 0.29 +/- 0.11), i.e., the curve steeper since the calf was stiffer, less compliant. The degree of outflow obstruction and severity of skin changes did not affect the slope measurement substantially. Collapsibility during venous outflow was significantly less in post-thrombotic legs. The post-thrombotic veins were less distended on standing. CONCLUSIONS: Post-thrombotic calves are less compliant than normal legs mainly due to less compliance of the vein wall, although theoretically reduced venous volume may contribute. SN - 0021-9509 UR - https://www.unboundmedicine.com/medline/citation/7629205/Compliance_of_the_normal_and_post_thrombotic_calf_ DB - PRIME DP - Unbound Medicine ER -
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