BACKGROUND: Postoperative pericardial adhesions have been associated with increased morbidity, mortality, and surgical difficulty. Barriers exist to limit adhesion formation, yet little is known about their use in cardiac surgery. The study presented here provides the first major systematic review of adhesion barriers in cardiac surgery. METHODS: Scopus and PubMed were assessed on November 20, 2020. Inclusion criteria were clinical studies on human subjects, and exclusion criteria were studies not published in English and case reports. Risk of bias was evaluated with the Cochrane Risk of Bias Tool. Barrier safety and efficacy data were assessed with Excel and GraphPad Prism 5. RESULTS: 25 studies were identified with a total of 13 barriers and 2,928 patients. Polytetrafluoroethylene (PTFE) was the most frequently evaluated barrier (13 studies, 67% of patients) with an infection rate of 1.14%, bleeding event rate of 0.75%, mortality rate of 1.22%, adhesion formation rate of 37.31%, and standardized tenacity score of 26.50. Several barriers had improved safety and efficacy. In particular, Cova CARD had an infection rate of 0.00%, a bleeding event rate of 0.00%, and a tenacity score of 15.00. CONCLUSIONS: Overall, the data varied considerably in terms of study design and reporting bias. The amount of data was also limited for the non-PTFE studies. PTFE has historically been effective in preventing adhesions. More recent barriers may be superior, yet the current data is non-confirmatory. No ideal adhesion barrier currently exists, and future barriers must focus on the requirements unique to operating in and around the heart.

Background: Premature infants who cannot achieve full oral feeds may need a gastrostomy tube (GT) to be discharged from the neonatal intensive care unit (NICU). We previously developed a model to predict which infants born <30 weeks (w) gestational age (GA) will require a GT before discharge. Here we report the detailed respiratory variable data to describe the general respiratory course for infants in the NICU <30w GA at birth and the association between different levels of respiratory support with postmenstrual age (PMA) at the time of first oral feeding attempt (PMAff), including later need for GT for discharge. Methods: Retrospective chart review of 391 NICU admissions comprising test (2015-2016) and validation (2017-2018) cohorts. Data, including respiratory support, were collected on 204 infants, 41 GT and 163 non-GT, in the test cohort, and 187 infants, 37 GT and 150 non-GT, in the validation cohort. Results: Respiratory data were significantly different between GT and non-GT infants. Infants who required GT for discharge were on significantly higher respiratory support at 30 days of age, 32w PMA, and 36w PMA. Respiratory parameters were highly correlated with PMAff. Conclusion: Respiratory status predicts PMAff, which was the variable in our previously described model that was most predictive of failure to achieve full oral feeing. These data provide a catalyst to develop strategies for improving oral feeding outcome for infants requiring prolonged respiratory support in the NICU.