Thumbnail
Access Restriction
Authorized

Author Chanda, J.
Source Sree Chitra Tirunal Institute for Medical Sciences & Technology
Content type Text
Publisher Annals of Thoracic Surgery
File Format PDF
Language English
Subject Domain (in DDC) Technology ♦ Medicine & health ♦ Diseases
Subject Domain (in MeSH) Cardiovascular Diseases ♦ Diseases
Subject Keyword Cardiology
Abstract To eliminate highly antigenic substances, bovine pericardium was washed in 5% sodium chloride (NaCl) for 24 hours, followed by incubation in trypsin for 40 minutes. To achieve adequate fixation, NaCl-trypsin-treated pericardium was preserved in glutaraldehyde (GA) solution with gradually increasing concentrations from 0.1% to 0.25%. To inactivate the free aldehyde groups and residual GA on the surface of the implant, NaCl-trypsin-GA-treated pericardial samples were posttreated separately with 1% lysine, 8% monosodium glutamate, and 4% chitosan. Fresh (untreated) and 0.1%, 0.2%, and 0.625% GA-treated and NaCl-trypsin-GA-treated pericardial specimens were prepared for comparative study. All samples were implanted subdermally in rats for 2, 4, 8, and 12 weeks for calcification studies. Morphologic and chemical analyses showed mild calcification in fresh pericardia (Ca, 10.5 +/- 1.25 mu g/mg, von Kossa +) and in glutamate-posttreated pericardia (Ca, 11.5 a 3.45 mu g/mg, von Kossa +). Calcium was practically undetectable in chitosan-posttreated implants (Ca, 1.1 +/- 0.27 mu g/mg, von Kossa 0), whereas severe calcification was noticed in the rest of the samples (mean Ca greater than 200.0 mu g/mg, von Kossa +++) at 12 weeks. This study suggests that posttreatment with an amino compound such as chitosan would prevent the calcification of GA-treated bioprostheses at an early implantation stage, but elimination of antigenic factors and adequate GA fixation would prevent tissue degeneration, thus enabling the prosthesis to function over a long period.
Education Level UG and PG
Learning Resource Type Article
Educational Framework Medical Council of India (MCI)
Journal ANNALS OF THORACIC SURGERY
Volume Number 60
Issue Number 2