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Improvement in neurological outcome and brain hemodynamics after late cranioplasty

  • Original Article - Brain trauma
  • Published:
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Abstract

Background

Early cranioplasty has been encouraged after decompressive craniectomy (DC), aiming to reduce consequences of atmospheric pressure over the opened skull. However, this practice may not be often available in low-middle-income countries (LMICs). We evaluated clinical improvement, hemodynamic changes in each hemisphere, and the hemodynamic balance between hemispheres after late cranioplasty in a LMIC, as the institution’s routine resources allowed.

Methods

Prospective cohort study included patients with bone defects after DC evaluated with perfusion tomography (PCT) and transcranial Doppler (TCD) and performed neurological examinations with prognostic scales (mRS, MMSE, and Barthel Index) before and 6 months after surgery.

Results

A final sample of 26 patients was analyzed. Satisfactory improvement of neurological outcome was observed, as well as significant improvement in the mRS (p = 0.005), MMSE (p < 0.001), and Barthel Index (p = 0.002). Outpatient waiting time for cranioplasty was 15.23 (SD 17.66) months. PCT showed a significant decrease in the mean transit time (MTT) and cerebral blood volume (CBV) only on the operated side. Although most previous studies have shown an increase in cerebral blood flow (CBF), we noticed a slight and nonsignificant decrease, despite a significant increase in the middle cerebral artery flow velocity in both hemispheres on TCD. There was a moderate correlation between the MTT and contralateral muscle strength (r =  − 0.4; p = 0.034), as well as between TCD and neurological outcomes ipsilateral (MMSE; r = 0.54, p = 0.03) and contralateral (MRS; p = 0.031, r =  − 0.48) to the operated side.

Conclusion

Even 1 year after DC, cranioplasty may improve cerebral perfusion and neurological outcomes and should be encouraged.

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Data availability

Datasets are available on request. The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.

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Acknowledgements

We dedicate this study to all patients of São Paulo University.

Author information

Authors and Affiliations

Authors

Contributions

AM and RL conception of the work, overall data collection, data analysis and interpretation, drafting the article, and final approval of the version to be published; WP conception of the work, data analysis, and interpretation and critical revision of the article; GS radiological data collection and interpretation; AF conception of the work and critical revision of the article; FM, EB transcranial Doppler data collection and interpretation; CI, MJ, and SB critical revision of the article. All authors contributed to manuscript revision, read and approved the submitted version.

Corresponding author

Correspondence to Sérgio Brasil.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Informed consent was obtained from all individual participants included in the study.

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Comments

Decompressive craniectomy effectively lowers ICP in patients with intracranial hypertension (e.g., following traumatic brain injury) and decreases the risk of intracranial herniation (e.g., following major ischaemic strokes). However, the treatment creates an abnormal intracranial physiology due to the post-operative incomplete rigid covering of the brain. The large skull defect probably affects cerebral autoregulation and, local blood flow, as well as CSF circulation and other fluid movements inside the brain. For some years, it is well recognized that cranioplasty improves neurological status in many patients and some studies have shown improved blood flow and normalized intracranial pressure physiology following the procedure, which might explain the positive clinical effect. The optimal timing of cranioplasty is, however, unknown and often depends of the individual patient. Most clinicians will probably consider the procedure at around 3 months after decompression. In this prospective study, the authors demonstrate that even delayed cranioplasty beyond 1 year after decompression seems to improve neurological status and reduce disabling symptoms such as posture- related headache. As traumatic brain injury occurs more frequently in low-middle income countries in which early cranioplasty is now always possible, the findings of this study are important and encourage cranioplasty even late after the primary procedure.

Alexander Lilja-Cyron, MD PhD

Rigshospitalet, Copenhagen, Denmark

Apart from concomitant medical treatment and intensive rehabilitative work, neurosurgical therapy can contribute significantly to the recovery of patients after decompressive craniectomy and its underlying cause. In this respect, the authors have added a valuable article to the literature on management of skull defects and cranioplasty. The results of their prospective study suggest that also late closure of the calotte can improve cerebral perfusion and clinical outcome. Although the benefits of early over late cranioplasty regarding both brain protection and hemodynamics, and patient recovery and esthetic aspect are obvious, this is not always feasible in a timely manner. The reasons for delayed cranioplasty can include the respective patient’'s clinical status, the institution’'s own resources, the conditions of the country the patients are living in, or the health care system the hospitals are embedded in. In addition, very early cranioplasty may be associated with potential problems such as increased intracranial pressure and risk of cerebrospinal fluid fistulas, depending on an accompanying brain swelling or the corresponding decompression technique applied. The main drawbacks of the present study are a small patient sample and lack of a control group. Despite these limitations, the authors could demonstrate that late cranioplasty seems to be reasonable and can be done effectively even one year after decompressive surgery with improvement of brain hemodynamics and neurological status.

Markus Florian Oertel

Zurich, Switzerland

This article is part of the Topical Collection on Brain trauma

University of São Paulo, School of Medicine Ethics Committee registration number: 0748/10

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Oliveira, A.M.P., Amorim, R.L.O., Brasil, S. et al. Improvement in neurological outcome and brain hemodynamics after late cranioplasty. Acta Neurochir 163, 2931–2939 (2021). https://doi.org/10.1007/s00701-021-04963-4

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