Short-time low PEEP challenge (SLPC, application of additional 5 cmH 2 O PEEP to patients for 30 s) is a novel functional hemodynamic test presented in the literature. We hypothesized that SLPC could predict fluid responsiveness better than stroke volume variation (SVV) in mechanically ventilated intensive care patients. Heart rate, mean arterial pressure, stroke volume index (SVI) and SVV were recorded before SLPC, during SLPC and before and after 500 mL fluid loading. Patients whose SVI increased more than 15% after the fluid loading were defined as fluid responders. Reciever operating characteristics (ROC) curves were generated to evaluate the abilities of the methods to predict fluid responsiveness. Fifty-five patients completed the study. Twenty-five (46%) of them were responders. Decrease percentage in SVI during SLPC (SVIΔ%-SLPC) was 11.6 ± 5.2% and 4.3 ± 2.2% in responders and non-responders, respectively (p < 0.001). A good correlation was found between SVIΔ%-SLPC and percentage change in SVI after fluid loading (r = 0.728, P < 0.001). Areas under the ROC curves (ROC-AUC) of SVIΔ%-SLPC and SVV were 0.951 (95% CI 0.857-0.991) and 0.747 (95% CI 0.611-0.854), respectively. The ROC-AUC of SVIΔ%-SLPC was significantly higher than that of SVV (p = 0.0045). The best cut-off value of SVIΔ%-SLPC was 7.5% with 90% sensitivity and 96% specificity. The percentage change in SVI during SLPC predicts fluid responsiveness in intensive care patients who are ventilated with low tidal volumes; the sensitivity and specificity values are higher than those of SVV.
BackgroundPerioperative myocardial injury is an important reason of mortality and morbidity after neurosurgery. It usually is missed due to asymptomatic character. In the present study, we investigated myocardial injury after noncardiac surgery (MINS) incidence, the risk factor for MINS and association of MINS with 30-day mortality in neurosurgery patients.
MethodsPatients with cardiac risk who underwent elective neurosurgery were enrolled to the study. The patients' demographics, comorbidities, medications used, medical history, and type of operation were recorded.The high-sensitivity cardiac troponin (hs-cTn) levels of the patients were measured 12, 24, and 48 hours after surgery. The patients were considered as MINS-positive if at least one of their postoperative hs-cTn measurement values was ≥14 ng/l. All the patients were followed up for 30 days after surgery for evaluation of their outcomes, including total mortality, mortality due to cardiovascular cause, and major cardiac events.
ResultsTotal 312 patients completed the study and 64 (20.5%) of them was MINS positive. Long antiplatelet or anticoagulant drug cessation time (OR: 4.9, 95%CI: 2.1-9.4) was found the most prominent risk factor for MINS occurrence. Total mortality rate was 2.4% and 6.2% in patients MINS negative and positive respectively (p = 0.112). The mortality rate due to cardiovascular reasons (0.8% for without MINS, 4.7for with MINS, and p=0.026) and incidence of the major cardiac event (4% for without MINS, 10.9 for with MINS, and p=0.026) were signi cantly higher in patients with MINS.
ConclusionsMINS is a common problem after neurosurgery and, high postoperative hs-cTn level is associated with mortality and morbidity.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.