Cold Atmospheric Plasma, Platelet-Rich Plasma, and Nitric Oxide Synthesis Inhibitor: Effects Investigation on an Experimental Model on Rats

The evolution of reconstructive methods for defects of the human body cannot yet replace the use of flap surgery. Research is still preoccupied with the ideal techniques for offering the best chances of survival of the flaps. In our study, we investigated the effects of cold atmospheric plasma (CAP), N-nitro-L-arginine methyl ester (L-NAME), and platelet-rich plasma (PRP) injectable solutions on flap survival using an in vivo model. Twenty-four Wistar rats (four groups) had the McFarlane flap raised and CAP, L-NAME, and PRP substances tested through a single dose subcutaneous injection. The control group had only a saline solution injected. To the best of our knowledge, this is the first study that evaluated a CAP activated solution through injection on flaps. The flap survival rate was determined by clinical examination (photography documented), hematology, thermography, and anatomopathological tests. The image digital analysis performed on the flaps showed that the necrosis area (control—49.64%) was significantly lower for the groups with the three investigated solutions: CAP (14.47%), L-NAME (18.2%), and PRP (23.85%). Thermography exploration revealed less ischemia than the control group on the CAP, L-NAME, and PRP groups as well. Anatomopathological data noted the best degree of angiogenesis on the CAP group, with similar findings on the L-NAME and PRP treated flaps. The blood work did not indicate infection or a strong inflammatory process in any of the subjects. Overall, the study shows that the CAP activated solution has a similar (better) impact on the necrosis rate (compared with other solutions with known effects) when injected on the modified dorsal rat skin flap, and on top of that it can be obtained fast, in unlimited quantities, non-invasively, and through a standardized process.

PRIMARY HYPERPARATHYROIDISM: OPTIMIZATION OF ANAESTHESIA

Background and Aims. The majority of cases of primary hyperparathyreosis (PHPT) due to solitary adenoma and require the target surgery. Research of new anesthesia/analgesia methods, which afford to have an opioid-sparing effect, is going. Methods. 127 patients with PHPT were divided into 3 groups: the group STI-BCSPB (n=26) was used combined general anesthesia (GA) with sevoflurane (SEV), the tracheal intubation (TI) with the myorelaxant introduction and bilateral cervical superficial plexus blockade (BCSPB); the group STI (n=82) was used SEV anaesthesia with IT and no BCSPB; the group PLM-BCSPB (n=19) was provided propofol (P) GA with protection air-ways by laryngeal mask (LM) and BCSPB. In both groups (STI-BCSPB and PLM-BCSPB) were used co-analgesics, such as dexamethasone (DXM) 8 mg IV, 2% lidocaine (L) 1,0-1,5 mg/kg IV, metamizole (M) or paracetamol (P) 1 g IV, dexketoprofen (DKTP) 50 mg IV as pre-emptive analgesia 30 min before surgery. Ketamine 25 mg IV was used for induction anaesthesia in these groups. In STI group only opioid with P were used for induction of GA. Duration of surgery (DoS), anaesthesia (DoA), opioid consumption, time from the operation ending until the eyes opening (EyOp), desaturation was measured. All data M±m Results. DoS for STI-BCSPB, STI and PLM-BCSPB was respectively 38.7±2.7, 37.8±1.3 and 35.6±1.7 min (NS), DoA was respectively 63.8±3.1, 59.4±1.4 m and 53,8±2.7 min (p= 0.028 STI vs PLM-BCSPB, p= 0.024 STI-BCSPB vs PLM-BCSPB, the difference is significant (DS). EyOp was 15.4±1.1, 15.6±1.2 and 11.6±0.9 min respectively for STI-BCSPB, STI and PLM-BCSPB (p=0.022 STI vs PLM-BCSPB (DS) and p=0.025 STI-BCSPB vs PLM-BCSPB (DS). Desaturation (SpO2 below 92%) due to residual sedation and the effect of muscles relaxants was observed in 39 (47.6%) and 11 (42,3%) patients in STI and STI-BCSPB during the first 30 min postop compared to 2 cases (10.5%) in PLM-BCSPB (both STI groups were DS vs PLM-BCSPB, chi-square test). The dose of intra-op fentanyl was 334.3±17.1, 256.5±16.9 197.3±15.3 mcg in STI, STI-BCSPB and PLM-BCSPB respectively, (DS for PLM-BCSPB vs other groups, DS between STI groups). Conclusions. Combine methods GA with BCSPB have some benefits over mono GA. Co-analgesics afford to achieve an opioidsparing effect. Under ectomy of single parathyroid adenoma, the use of propofol and BSCPB with the laryngeal mask without muscles relaxants seems more preferable compared to sevoflurane anesthesia with BBSCP and tracheal intubation due to the shorter anesthesia duration, time to eye-opening after surgery, lower desaturation frequency.