BOLD cerebrovascular reactivity as a novel marker for crossed cerebellar diaschisis
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- White matter abnormalities in aneurysmal and angiographically negative subarachnoid hemorrhage: A diffusion kurtosis imaging study, NeuroImage: Clinical, 43, (103662), (2024).https://doi.org/10.1016/j.nicl.2024.103662
- Case report: Multiple disconnection patterns revealed by a multi-modal analysis explained behavior after a focal frontal damage, Frontiers in Neurology, 14, (2023).https://doi.org/10.3389/fneur.2023.1142734
- Hemodynamic Failure Staging With Blood Oxygenation Level–Dependent Cerebrovascular Reactivity and Acetazolamide‐Challenged ( 15 O‐)H 2 O‐Positron Emission Tomography Across Individual Cerebrovascular Territories , Journal of the American Heart Association, 12, 24, (2023).https://doi.org/10.1161/JAHA.123.029491
- Heterogeneous motor BOLD-fMRI responses in brain areas exhibiting negative BOLD cerebrovascular reactivity indicate that steal phenomenon does not always result from exhausted cerebrovascular reserve capacity, Magnetic Resonance Imaging, 103, (124-130), (2023).https://doi.org/10.1016/j.mri.2023.07.010
- Research Applications of Positron Emission Tomography/Magnetic Resonance (PET/MR) Imaging in Cerebrovascular Diseases, PET/MR: Functional and Molecular Imaging of Neurological Diseases and Neurosciences, (265-296), (2023).https://doi.org/10.1007/978-981-19-9902-4_12
- Neurovascular Uncoupling in Functional MRI, Functional Neuroradiology, (511-520), (2023).https://doi.org/10.1007/978-3-031-10909-6_23
- Editorial for “Altered Callosal Morphology and Connectivity in Asymptomatic Carotid Stenosis”, Journal of Magnetic Resonance Imaging, 59, 3, (1008-1009), (2023).https://doi.org/10.1002/jmri.28867
- Diaschisis Profiles in the Cerebellar Response to Hemodynamic Stimuli: Insights From Dynamic Measurement of Cerebrovascular Reactivity to Identify Occult and Transient Maxima, Journal of Magnetic Resonance Imaging, 58, 5, (1462-1469), (2023).https://doi.org/10.1002/jmri.28648
- Editorial for “Diaschisis Profiles in the Cerebellar Response to Hemodynamic Stimuli: Insights From Dynamic Measurement of Cerebrovascular Reactivity to Identify Occult and Transient Maxima”, Journal of Magnetic Resonance Imaging, 58, 5, (1470-1471), (2023).https://doi.org/10.1002/jmri.28646
- More pronounced hemodynamic alterations in patients with brain arteriovenous malformation–associated epilepsy, Neurosurgical Focus, 53, 1, (E4), (2022).https://doi.org/10.3171/2022.4.FOCUS22117
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We kindly thank Drs. Reidler and Kunz for their insightful comments regarding our paper.1 The main objective was to study BOLD-CVR for CCD detection. In this regard, worse clinical outcome in the CCD(+) group should indeed be interpreted with caution. Ideally, this association needs to be further investigated in a uniform stroke cohort with sequential follow-up studies.
We deliberately did not comment on supratentorial stroke volume, since it is an inexact measurement and does not say anything about the infarct location.2 Besides, the concept that stroke volume is highly associated with presence of CCD in the acute phase remains debatable, as the studies mentioned in the readers’ comment appeared to be in disagreement.3,4 Nevertheless, we agree that stroke location would be a better variable for an adjusted analysis.
The statement made by Drs. Reidler and Kunz about "inferior cerebrovascular response indicating more severe supratentorial lesions" is, however, erroneous. We have only shown the presence of more impaired supratentorial BOLD-CVR in the CCD(+) group. This finding has led us to believe that hemodynamic alterations may also cause CCD rather than a functional disruption alone. In general, BOLD imaging enables investigations on resting-state functional connectivity and the influence of CCD-induced altered metabolism in stroke patients.5
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For disclosures, please contact the editorial office at [email protected].
We read with great interest the article by Sebök et al. on the detection of crossed cerebellar diaschisis (CCD) in subacute and chronic stroke using BOLD-MRI. [1] They observed that patients with signs of CCD had poorer neurologic function at baseline and at 3 months. However, as adjusted analysis is lacking, it remains unclear whether CCD was the cause or consequence of poor outcomes.
The phenomenon of CCD, especially in the acute phase, is highly associated with large-volume supratentorial stroke. [2,3] Acute CCD had no independent impact on outcome and may be an epiphenomenon of large-volume strokes. [2] Correlations of chronic CCD with worse outcome have been reported, yet adjustments were not made for confounders. [4,5] In the current study, inferior cerebrovascular response indicated more severe supratentorial lesions in the CCD+ group, yet lesion volumes were not specified. [1] As lesion volume and distribution affect outcome, group comparisons should be interpreted with caution concerning a CCD-outcome relationship. The final infarct size and location would provide additional insight on this matter.
Interestingly, CCD has been linked to BOLD signal change, a measure of neuronal metabolism and activity. This is encouraging for future studies relating resting state functional connectivity and CCD status.
For disclosures, please contact the editorial office at [email protected].