Purpose: To examine the inotropic and chronotropic effects of xenon (Xe) and nitrous oxide (N2O) compared with nitrogen (N-2) on isolated rat hearts. The differences between Xe and N2O were also compared.Methods: The effects of Xe, N2O and N-2 on coronary perfusion pressure (CPP), heart rate, left ventricular developed pressure (LVDP) and double product (DP) were examined in isolated rat hearts perfused at constant flow (10 mL.min(-1)). Following stabilization and baseline measurement with 95% O-2 (plus 5% CO2), the heart was exposed to buffer equilibrated with one of three test gases; 50% N-2 with 4596 O-2 (Group N-2: n=9),50% Xe with 45% O-2 (Group Xe: n=9), or 50% N2O with 45% O-2 (Group N2O: n=9) for 30 min. Measurements were performed in the last minute of exposure to the test gases.Results: Gas exposure in all three groups decreased O-2 delivery (-50%), CPP (-11%), LVDP (-30%) and DP (-44%) compared with baseline values (P < 0.001). However, there were no differences among the groups.Conclusion: Our data suggest that cardiac contractility was decreased by the effects of reduced O-2 delivery but both Xe and N2O did not cause further cardiac depressant effects compared to N-2 in this experimental model.
Efforts toward the synthesis of liphatic iodonium salts
作者:Joseph B. Dence、John D. Roberts
DOI:10.1021/jo01267a073
日期:1968.3
Rigaudy; Kha-Vang-Thang, Bulletin de la Societe Chimique de France, 1959, p. 1618,1619