Cefazolin Concentration in the Mediastinal Adipose Tissue of Patients Undergoing Cardiac Surgery

• Published in: Revista brasileira de cirurgia cardiovascular Vol. 32; no. 4; pp. 239 - 244
• Main Authors: Tchaick, Rodrigo Mezzalira, Sá, Michel Pompeu Barros Oliveira, Figueira, Fernando Ribeiro de Moraes, Paz, Kilma Coelho, Ferraz, Álvaro Antonio Bandeira, Moraes, Neto, Fernando Ribeiro de
• Format: Journal Article
• Language: English
• Published: Brazil Sociedade Brasileira de Cirurgia Cardiovascular 01-01-2017
• Subjects: Adipocytes; Adipose Tissue; Adipose Tissue - chemistry; Adult; Aged; Anti-Bacterial Agents - administration & dosage; Anti-Bacterial Agents - analysis; Antibiotics; Body fat; Body Mass Index; CARDIAC & CARDIOVASCULAR SYSTEMS; Cardiac Surgical Procedures; Cardiology; Cefazolin; Cefazolin - administration & dosage; Cefazolin - analysis; Chromatography; Chromatography, High Pressure Liquid - methods; Coronary vessels; Female; Heart surgery; Hospital costs; Humans; Intraoperative Period; Male; Mediastinum; Middle Aged; Original; Patients; Statistical analysis; SURGERY; Tissues; Variables; Veins & arteries; Brazil; Cardiac Surgical Procedures; Cefazolin; Adipose Tissue; Mediastinum
• ISSN: 0102-7638; 1678-9741; 1678-9741
• DOI: 10.21470/1678-9741-2016-0031

To measure the concentration of cefazolin in the anterior mediastinal adipose tissue of patients undergoing cardiac surgery, determining the variation of cefazolin concentration.
Two samples of approximately 1g of subcutaneous tissue were collected from 19 patients who underwent surgery in December 2015: the first sample was collected right after sternotomy and the second one, before sternal synthesis with steel wires. Antibiotic dosage was administered through high performance liquid chromatography.
We observed a positive and statistically significant correlation between time 1 and cefazolin concentration (r=0.489 and P=0.039). For time 2 and cefazolin concentration, there was a negative and statistically significant correlation between both variables (r=-0.793 and P<0.001). A negative correlation was also observed between body mass index and cefazolin concentration at time 2 (r=-0.510 and P=0.031). The regression model showed that every 1-minute increase in time 1 corresponded to an increase of 0.240 µg/dL in cefazolin concentration, whereas every 1-minute increase in time 2 corresponded to a reduction of 0.046 µg/dL in cefazolin concentration. As for body mass index, every 1 kg/m2 increase corresponded to a reduction of about 0.510 µg/dL in cefazolin concentration.
There was a positive and significant correlation between the initial time of surgery and cefazolin level in the first dosage. The evaluation of the second dosage showed a negative and significant correlation between cefazolin level and the second time of dosage. The concentration of cefazolin is under the influence of body mass index.