Transdermal HRT decreased BP in normotensive PMW without influencing Ang II, whereas oral HRT increased Ang II without altering BP. Transdermal HRT may be more beneficial than oral HRT with regard to BP and Ang II levels.
Background: Coagulopathy after cardiopulmonary bypass (CPB) is caused by multiple factors, including reduced coagulation factors and a low platelet count.
Methods and Results:In this study, we undertook a post hoc analysis to identify factors associated with increased postoperative blood loss in 97 patients undergoing cardiac surgery with CPB, with fresh frozen plasma administered according to a ROTEM-guided algorithm. We identified 24 patients for the top quartile of postoperative blood loss, >528 mL and defined as having excessive blood loss. Using Spearman's rank correlation test and multivariable linear regression, we reanalyzed the participants' demographic, surgical and anesthetic variables, laboratory test results, blood loss, and transfusion data. Univariate analysis indicated that patients who experienced higher postoperative blood loss received a significantly higher heparin dose, had a higher requirement for fresh frozen plasma transfusion during surgery, and had a significantly lower hematocrit and platelet count at the end of surgery compared with patients without excessive blood loss. Multivariate analysis showed that platelet count at the end of surgery (odds ratio 0.780, 95% confidence interval 0.629-0.967; P=0.024) was an independent factor for excessive blood loss.
Conclusions:Low platelet count at the end of surgery was associated with excessive postoperative bleeding during cardiac surgery with CPB.
Objective The effects of hydroxyethyl starch (HES) on microcirculation, central venous oxygen saturation (ScvO 2 ), and the central venous-to-arterial carbon dioxide gap (dCO 2 ) are studied in a rabbit model of hemorrhagic shock for elucidating the advantages and drawbacks of resuscitation with HES compared with crystalloids. Methods An ear chamber and sublingual mucosa were used to examine blood vessels by intravital microscopy. Hemorrhagic shock was induced by removing nearly half of the blood volume. Twenty-two rabbits received 20 mL of HES by intravenous infusion immediately after bloodletting. Additional HES was then administered intravenously to a total volume of 100 mL. The other 22 rabbits (control) were intravenously given 40 mL of normal saline solution (NSS), followed by additional NSS to a total volume of 200 mL, administered under the same conditions as HES. Results After the infusion, the vessel density and perfusion rate of the sublingual microcirculation recovered in the HES group. The arteriolar diameter, blood flow velocity, and blood flow rate of the ear microcirculation were maintained in this group, and microcirculatory failure did not develop. In the NSS group, however, all 5 of the aforementioned measured variables were significantly smaller than those in the HES group after the completion of infusion. The recovery of ScvO 2 and dCO 2 to the respective baseline values was significantly better in the HES group than in the NSS group. Conclusion Intravenous infusion of HES effectively maintains adequate tissue oxygenation and perfusion in hemorrhagic shock.
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