A recent pilot study published in the distinguished journal, ‘World Neurosurgery’, sheds light on an innovative option for duraplasty, an essential neurosurgical procedure where the dura mater—a tough membrane surrounding the brain and spinal cord—is repaired. The ground-breaking research, conducted by a team from the Neurosurgery Teaching and Assistance Unit at Pedro Ernesto University Hospital, University of State of Rio de Janeiro, explored the efficacy of bovine pericardium treated with polyethylene glycol and ethanol as compared to the traditional pericranium tissue used in duraplasty.

Duraplasty: The Challenge in Neurosurgery

Duraplasty is a critical step following intracranial surgery to ensure the watertight closure of the dura mater. Success in this process is crucial, as it prevents complications such as cerebrospinal fluid (CSF) leaks, central nervous system infections, and herniations of brain tissue. Achieving a watertight closure is especially imperative in supratentorial neurosurgery, which involves the region above the tentorium cerebelli—a membrane that separates the cerebrum from the cerebellum.

Traditionally, when primary dura closure proves to be nonviable, the pericranium or the patient’s own dural tissue is preferred for repair. However, cases exist where these are either not sufficient or not available, necessitating an alternative dural substitute. While several synthetic and biological substitutes exist, finding a reliable and safe material is of utmost concern for neurosurgeons and patients alike.

Bovine Pericardium: A Potential Alternative

The study, DOI: 10.1016/j.wneu.2024.01.044, focused on an innovative material—bovine pericardium that has been specially treated with polyethylene glycol and ethanol—to serve as the dural substitute. This promising alternative was compared with the pericranium in a sample of 20 patients undergoing supratentorial surgery. Although three patients from the bovine pericardium group and two from the pericranium group were lost to follow-up, the research yielded significant insights based on the outcomes of the remaining 15 patients.

Findings and Interpretation of Results

Upon analysis, researchers found no statistically significant difference in the rate of complications, including surgical site infection and hydrocephalus, between the two groups. The mean procedure time was marginally less in the bovine pericardium group than in the pericranium group, potentially indicating a slight advantage in terms of surgical efficiency. Furthermore, The mean graft area considerably larger in the bovine pericardium substitute, suggesting that it may offer better coverage in cases requiring larger grafts.

It is important to note, though, that the calculated relative risk for complications was higher in the bovine pericardium group (RR=1.08). However, due to the sample size and statistical power of the study, this was not found to be significant. These outcomes call attention to the necessity for further studies with more extensive samples to validate these preliminary findings accurately.

A Promising Outlook

The results from this pilot study are especially compelling not only because they suggest a viable alternative to the pericranium but also as they open the door to potential solutions for neurosurgical challenges, particularly where traditional dural grafts cannot be used. The researchers, led by Dr. Rosa Magno Rocha Freitas (Resident of Neurosurgery) alongside colleagues such as Dr. Maud Parise (Adjunct Professor of Neurosurgery) and Dr. Flavio Nigri (Associate Professor and Chief of the Neurosurgery Teaching and Assistance Unit), emphasize the significance of their findings and encourage more extensive investigations to confirm the efficacy of bovine pericardium treated with polyethylene glycol and ethanol as a dural substitute.

Importantly, this study illuminates not only a medical advance but also underscores the perpetual quest for innovation in the field of neurosurgery. It serves as a testament to the importance of ongoing research and the continued search for materials that can lead to fewer complications, reduced surgical time, and better overall outcomes for patients.

Ethical and Practical Considerations

Although the use of bovine pericardium is not novel in medical applications — it has been previously used in cardiothoracic surgeries for valve replacements — neurosurgical applications demand very stringent criteria due to the sensitive nature of the central nervous system and the imperative need for biocompatibility and sterility. The treatment of the bovine pericardium with polyethylene glycol and ethanol is a pivotal step that ensures the elimination of pathogens and enhances compatibility, making it a suitable candidate for neurological applications.

Furthermore, this study showcases the collaborative nature of modern medical research, blending expertise from residents to professors and department chiefs, indicating the various levels of mentorship and knowledge-sharing that are core to advancing medical science.

The Future of Duraplasty: A Look Ahead

As with any pilot study, the findings presented here are just the beginning. While the initial results are promising, the call for more substantive research — with larger patient cohorts and longer follow-up periods — is crucial for certifying these conclusions. However, the potential impact of such an alternative material cannot be understated. If larger studies support these findings, the use of polyethylene glycol and ethanol-treated bovine pericardium could become a standard in neurosurgical procedures where native tissues are insufficient or unavailable.

Relevance to Patients and Practitioners

For patients, findings like these offer the potential for more effective and resilient surgical outcomes with a minimal risk of complications from the material used for duraplasty. For practitioners, it provides a potential new tool in their surgical arsenal, one that could streamline procedures and offer more versatility when performing complex surgeries.

Citations and Further Reading:

For readers seeking additional information, these are crucial resources to explore:

1. Freitas, R.M.R., Parise, M., Nigri, F. (2024). Bovine pericardium treated with polyethylene glycol and ethanol versus pericranium for duraplasty: a pilot study in supratentorial neurosurgery. World Neurosurg, DOI: 10.1016/j.wneu.2024.01.044.


1. Duraplasty dural substitute
2. Supratentorial neurosurgery
3. Bovine pericardium graft
4. Neurosurgical complications
5. Cerebrospinal fluid leakage prevention

In conclusion, the research provided by Freitas et al. (2024) is a milestone in the search for viable dural substitutes. The preliminary findings suggest that treated bovine pericardium may offer a comparable, if not advantageous, alternative to conventional pericranium materials used in duraplasty procedures. This pilot study lays the groundwork for future research, propelling the field of neurosurgery toward potential new standards in patient care and operative technique. As with any scientific endeavor, the replication and expansion of this research are eagerly anticipated by the medical community and beyond.