A prospective study to analyse the concentration of octenidine in hand wounds after disinfection by LC-MS/MS

Toxic reactions can appear after pressurised flushing of soft tissue with octenidine (OCT) containing disinfectants. Their use for surgical disinfection could complicate the diagnosis of possible contamination. In patients with open lacerations of their hand's subcutaneous tissue samples were taken before and after surgical disinfection with Octenisept® and analysed by ultra-high-performance liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS). In 16 out of 20 tissue samples, OCT was detected after disinfection (lower limit of quantification (LLOQ)=10 pg/mL/mg). The concentration of OCT was below the LLOQ, estimation of mean of 0.6 pg/mL/mg (0.22-0.98 pg/mL/mg, 95%-CI) before disinfection and mean of 179.4 pg/mL/mg (13.35-432.0 pg/mL/mg, 95%-CI) after disinfection. This study shows that the disinfection of open wounds with Octenisept® leads to a quantifiable concentration of OCT in open wounds. In cases of suspected OCT-mediated toxic reaction, the use of antiseptics containing OCT should be avoided.

Chronic Ankle Instability (Medial and Lateral)

Ankle ligament injuries are among the most frequent reasons for emergency consultations of athletes. A majority of these can be treated conservatively; however, up to 40% develop chronic ankle instability requiring surgical reconstruction to restore functionality.

Chronic Ankle Instability (Medial and Lateral)

Ankle ligament injuries are among the most frequent reasons for emergency consultations of athletes. A majority of these can be treated conservatively; however, up to 40% develop chronic ankle instability requiring surgical reconstruction to restore functionality.

Osteoligamentous injuries of the medial ankle joint

Injuries of the ankle joint have a high incidence in daily life and sports, thus, playing an important socioeconomic role. Therefore, proper diagnosis and adequate treatment are mandatory. While most of the ligament injuries around the ankle joint are treated conservatively, great controversy exists on how to treat deltoid ligament injuries in ankle fractures. Missed injuries and inadequate treatment of the medial ankle lead to inferior outcome with instability, progressive deformity, and ankle joint osteoarthritis.

Conservation in sequence and affinity of human and rodent PDGF ligands and receptors

Platelet-derived growth factor (PDGF) consists of two chains, PDGF-A and -B, which activate as homo- or heterodimers two receptors, alpha and beta. To test PDGF function in vivo we have generated neutralizing monoclonal antibodies. When analyzed with rat PDGFs only antibodies raised against human PDGF-AA showed cross-species activity. This correlated with complete amino acid sequence conservation of PDGF-A whereas rat PDGF-B differed in six positions when cloned rat PDGF cDNAs were compared with their human homologs within the receptor binding region. Extracellular domains of cloned rat PDGF alpha- and beta-receptor cDNAs did not reflect this difference in cross-species ligand conservation. When rat extracellular domains were expressed as soluble proteins they bound human PDGF-BB with high affinity after immobilization of the purified proteins on solid phase. Dissociation constants were identical to those of their human homologs. Thus, high affinity binding of human PDGF-BB to extracellular domains does not depend on species origin but only on receptor type.