Continuous cardiovascular hemodynamics monitoring with pressure recording analytical method in patients under spinal anesthesia for elective cesarean section: a pilot study

BACKGROUND

Pressure recording analytical method (PRAM) of MOSTCARE is a minimally invasive system based on mathematical analysis of arterial pressure profile changes and allows continuous recording of hemodynamic measurements. Herein, we aimed to use the MostCare system to investigate the hemodynamics of patients receiving spinal anesthesia during elective cesarean section.

METHODS

In this observational study, we recruited 17 patients scheduled for elective cesarean section. For each patient, we acquired continuous recordings of hemodynamic parameters at 14 key timepoints: surgical admission (two baseline parameters), immediately after the administration of spinal anesthesia, six subsequent time points (2, 4, 6, 8, 10, and 12 min after anesthesia), during peritoneum and uterine incision, during delivery, following the administration of oxytocin, and after surgery had been completed. Statistical analysis was carried out by repeated measures analysis of variance (ANOVA).

RESULTS

During a twelve min period after spinal anesthesia, we observed significant reductions in mean arterial pressure (MAP), dicrotic pressure (Pdic), cardiac index (CI), stroke volume index (SVI), dP/dtmax, and cardiac cycle efficiency (CCE) (P<0.05 for all). However, systemic vascular resistance index (SVRI) was reversely correlated to CI and increased significantly after spinal anesthesia (P<0.05). These hemodynamic parameters return to near basal values after peritoneum incision. Furthermore, there were significant fluctuations in MAP, Pdic and CI after oxytocin administration (P<0.05).

CONCLUSIONS

PRAM of MostCare system revealed significant changes in key hemodynamic parameters undergoing cesarean section with spinal anesthesia. It enables clinicians gain a much better understanding of hemodynamics of parturients and optimize clinical management strategies.

TRIAL REGISTRATION

This study was registered at http://www.chictr.org.cn on 16, July, 2019. No. ChiCTR1900024566.

Perioperative Goal-Directed Therapy during Kidney Transplantation: An Impact Evaluation on the Major Postoperative Complications

Background: Kidney transplantation is considered the first-choice therapy in end-stage renal disease (ESRD) patients. Despite recent improvements in terms of outcomes and graft survival in recipients, postoperative complications still concern the health-care providers involved in the management of those patients. Particularly challenging are cardiovascular complications. Perioperative goal-directed fluid-therapy (PGDT) and hemodynamic optimization are widely used in high-risk surgical patients and are associated with a significant reduction in postoperative complication rates and length of stay (LOS). The aim of this work is to compare the effects of perioperative goal-directed therapy (PGDT) with conventional fluid therapy (CFT) and to determine whether there are any differences in major postoperative complications rates and delayed graft function (DGF) outcomes. Methods: Prospective study with historical controls. Two groups, a PGDT and a CFT group, were used: The stroke volume (SV) optimization protocol was applied for the PGDT group throughout the procedure. Conventional fluid therapy with fluids titration at a central venous pressure (CVP) of 8–12 mmHg and mean arterial pressure (MAP) >80 mmHg was applied to the control group. Postoperative data collection including vital signs, weight, urinary output, serum creatinine, blood urea nitrogen, serum potassium, and assessment of volemic status and the signs and symptoms of major postoperative complications occurred at 24 h, 72 h, 7 days, and 30 days after transplantation. Results: Among the 66 patients enrolled (33 for each group) similar physical characteristics were proved. Good functional recovery was evident in 92% of the CFT group, 98% of the PGDT group, and 94% of total patients. The statistical analysis showed a difference in postoperative complications as follows: Significant reduction of cardiovascular complications and DGF episodes (p < 0.05), and surgical complications (p < 0.01). There were no significant differences in pulmonary or other complications. Conclusions: PGDT and SV optimization effectively influenced the rate of major postoperative complications, reducing the overall morbidity and thus the mortality in patients receiving kidney transplantation.