1
|
Jenkins DD, Moss HG, Adams LE, Hunt S, Dancy M, Huffman SM, Cook D, Jensen JH, Summers P, Thompson S, George MS, Badran BW. Higher Dose Noninvasive Transcutaneous Auricular Vagus Nerve Stimulation Increases Feeding Volumes and White Matter Microstructural Complexity in Open-Label Study of Infants Slated for Gastrostomy Tube. J Pediatr 2023; 262:113563. [PMID: 37329979 PMCID: PMC11000235 DOI: 10.1016/j.jpeds.2023.113563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 06/06/2023] [Accepted: 06/12/2023] [Indexed: 06/19/2023]
Abstract
OBJECTIVE To determine whether transcutaneous auricular vagus nerve stimulation (taVNS) paired with twice daily bottle feeding increases the volume of oral feeds and white matter neuroplasticity in term-age-equivalent infants failing oral feeds and determined to need a gastrostomy tube. STUDY DESIGN In this prospective, open-label study, 21 infants received taVNS paired with 2 bottle feeds for 2 - 3 weeks (2x). We compared 1) increase oral feeding volumes with 2x taVNS and previously reported once daily taVNS (1x) to determine a dose response, 2) number of infants who attained full oral feeding volumes, and 3) diffusional kurtosis imaging and magnetic resonance spectroscopy before and after treatment by paired t tests. RESULTS All 2x taVNS treated infants significantly increased their feeding volumes compared with 10 days before treatment. Over 50% of 2x taVNS infants achieved full oral feeds but in a shorter time than 1x cohort (median 7 days [2x], 12.5 days [1x], P < .05). Infants attaining full oral feeds showed greater increase in radial kurtosis in the right corticospinal tract at the cerebellar peduncle and external capsule. Notably, 75% of infants of diabetic mothers failed full oral feeds, and their glutathione concentrations in the basal ganglia, a measure of central nervous system oxidative stress, were significantly associated with feeding outcome. CONCLUSIONS In infants with feeding difficulty, increasing the number of daily taVNS-paired feeding sessions to twice-daily significantly accelerates response time but not the overall response rate of treatment. taVNS was associated with white matter motor tract plasticity in infants able to attain full oral feeds. TRIAL REGISTRATION Clinicaltrials.gov (NCT04643808).
Collapse
Affiliation(s)
- Dorothea D Jenkins
- Department of Pediatrics at the Medical University of South Carolina, Charleston, SC; Department of Neuroscience, Medical University of South Carolina, Charleston, SC.
| | - Hunter G Moss
- Department of Neuroscience, Medical University of South Carolina, Charleston, SC; Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC
| | - Lauren E Adams
- College of Medicine, Medical University of South Carolina, Charleston, SC
| | - Sally Hunt
- College of Medicine, Medical University of South Carolina, Charleston, SC
| | - Morgan Dancy
- Brain Stimulation Division, Department of Psychiatry, Medical University of South Carolina, Charleston, SC
| | - Sarah M Huffman
- Brain Stimulation Division, Department of Psychiatry, Medical University of South Carolina, Charleston, SC
| | - Daniel Cook
- College of Medicine, Medical University of South Carolina, Charleston, SC
| | - Jens H Jensen
- Department of Neuroscience, Medical University of South Carolina, Charleston, SC; Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC; Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, SC
| | - Philipp Summers
- Brain Stimulation Division, Department of Psychiatry, Medical University of South Carolina, Charleston, SC
| | - Sean Thompson
- Department of Neurology, Emory University School of Medicine, Atlanta, GA
| | - Mark S George
- Brain Stimulation Division, Department of Psychiatry, Medical University of South Carolina, Charleston, SC; Ralph H. Johnson VA Medical Center, Charleston, SC
| | - Bashar W Badran
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC; Neuro-X Lab, Department of Psychiatry and Behavioral Sciences, Medical University of South Carolina, Charleston, SC
| |
Collapse
|
2
|
Cribb AR, Moss HG, McGhee HC, Nichols K, Bonilha HS, Jensen JH, Brennan A, Badran BW, George MS, Jenkins DD. Transcutaneous auricular vagus nerve stimulation-paired feeding may enhance white matter tract integrity to improve swallow coordination in infants with oromotor dysfunction. Brain Stimul 2023. [DOI: 10.1016/j.brs.2023.01.748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023] Open
|
3
|
Moss HG, Benitez A, Jensen JH. Optimized rectification of fiber orientation density function with background threshold. Magn Reson Imaging 2023; 95:80-89. [PMID: 36368495 PMCID: PMC9695117 DOI: 10.1016/j.mri.2022.11.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Revised: 10/27/2022] [Accepted: 11/03/2022] [Indexed: 11/09/2022]
Abstract
PURPOSE To describe an optimized fiber orientation density function (fODF) rectification procedure that removes negative values and absorbs all features below a specified threshold into a constant background. THEORY AND METHODS The fODF for a white matter imaging voxel describes the angular density of axons. Because of signal noise and Gibbs ringing, fODFs estimated with diffusion MRI may take on unphysical negative values in some directions and contain spurious peaks. In order to suppress such artifacts, an fODF rectification procedure is proposed that both eliminates all negative values and incorporates all features below a specified threshold, η, into a constant background while at the same time minimizing the mean square deviation from the original, unrectified fODF. Calculating this fODF is straightforward, and the directions and shapes of peaks not absorbed into the background are preserved. The rectification method is illustrated for an analytic fODF model and for experimental diffusion MRI data obtained in healthy human brain, with the original fODFs being obtained from fiber ball imaging. RESULTS Examples of optimal rectified fODFs are given for three choices of the background threshold referred to as minimal rectification (η = 0), average-level rectification (η ≈ 0.08), and fractional-anisotropy-axonal-based rectification (η ≈ 0.1). As η is increased, artifacts and other small features are more strongly suppressed, but the major fODF peaks are largely unaffected for the range of η values illustrated by these three alternatives. CONCLUSION Artifactual features of fODFs estimated with diffusion MRI can be effectively suppressed by applying the proposed optimized rectification procedure. Since it minimizes fODF distortion in the mean square sense, it may be useful in the study of how fODF fine structure is affected by aging and disease.
Collapse
Affiliation(s)
- Hunter G Moss
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, United States of America; Department of Neuroscience, Medical University of South Carolina, Charleston, SC, United States of America
| | - Andreana Benitez
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, United States of America; Department of Neurology, Medical University of South Carolina, Charleston, SC, United States of America
| | - Jens H Jensen
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, United States of America; Department of Neuroscience, Medical University of South Carolina, Charleston, SC, United States of America; Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, SC, United States of America.
| |
Collapse
|
4
|
Moss HG, Jensen JH. High fidelity fiber orientation density functions from fiber ball imaging. NMR Biomed 2022; 35:e4613. [PMID: 34510596 PMCID: PMC8919238 DOI: 10.1002/nbm.4613] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2021] [Revised: 07/09/2021] [Accepted: 08/19/2021] [Indexed: 05/04/2023]
Abstract
The fiber orientation density function (fODF) in white matter is a primary physical quantity that can be estimated with diffusion MRI. It has often been employed for fiber tracking and microstructural modeling. Requirements for the construction of high fidelity fODFs, in the sense of having good angular resolution, adequate data to avoid sampling errors, and minimal noise artifacts, are described for fODFs calculated with fiber ball imaging. A criterion is formulated for the number of diffusion encoding directions needed to achieve a given angular resolution. The advantages of using large b-values (≥6000 s/mm2 ) are also discussed. For the direct comparison of different fODFs, a method is developed for defining a local frame of reference tied to each voxel's individual axonal structure. The Matusita anisotropy axonal is proposed as a scalar fODF measure for quantifying angular variability. Experimental results, obtained at 3 T from human volunteers, are used as illustrations.
Collapse
Affiliation(s)
- Hunter G. Moss
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, South Carolina
- Department of Neuroscience, Medical University of South Carolina, Charleston, South Carolina
| | - Jens H. Jensen
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, South Carolina
- Department of Neuroscience, Medical University of South Carolina, Charleston, South Carolina
- Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, South Carolina
| |
Collapse
|
5
|
Aljuhani T, Haskin H, Davis S, Reiner A, Moss HG, Badran BW, George MS, Jenkins D, Coker-Bolt P. Transcutaneous auricular vagus nerve stimulation (taVNS) given for poor feeding in at-risk infants also improves their motor abilities. J Pediatr Rehabil Med 2022; 15:447-457. [PMID: 36093716 PMCID: PMC9976577 DOI: 10.3233/prm-210090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
PURPOSE Transcutaneous auricular vagus nerve stimulation (taVNS) is a non-invasive neuromodulation technique that may improve oromotor skills when paired with feeding in at-risk infants, but effects on other motor function and how motor function relates to white matter (WM) microstructure are unknown. METHODS In this prospective study, infants failing oral feeds and slated for gastrostomy tube (G-tube) placement received taVNS paired with bottle feeding daily for 2-3 weeks. The effects of taVNS-paired feeding on general and specific head movements were investigated using the Specific Test of Early infant motor Performance (STEP) and diffusion MRI obtained before and after taVNS treatment. Scores between and within groups (taVNS responders, attained full oral feeds; non-responders, received G-tubes) were compared. RESULTS Performance on head movement items improved significantly in responders but not in non-responders (p < 0.05). Total STEP scores were significantly higher in responders after taVNS treatment than non-responders (p = 0.04). One STEP item, rolling by arm, was associated with significantly greater change in WM tract microstructure (p < 0.05) in the responders. CONCLUSION These results suggest that pairing feeding with taVNS may affect specific head and neck movements to a greater extent in infants who are able to attain full oral feeds.
Collapse
Affiliation(s)
- Turki Aljuhani
- Division of Health Science and Research, Medical University of South Carolina, Charleston, SC, USA.,Department of Occupational Therapy, College of Applied Medical Sciences, King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
| | - Hannah Haskin
- Division of Occupational Therapy, Medical University of South Carolina, Charleston, SC, USA
| | - Shelby Davis
- Division of Occupational Therapy, Medical University of South Carolina, Charleston, SC, USA
| | - Amy Reiner
- Division of Occupational Therapy, Medical University of South Carolina, Charleston, SC, USA
| | - Hunter G Moss
- Graduate Studies, Neuroscience, Medical University of South Carolina, Charleston, SC, USA.,Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, USA
| | - Bashar W Badran
- Neuro-X Lab, Department of Psychiatry and Behavioral Sciences, Medical University of South Carolina, Charleston, SC, USA
| | - Mark S George
- Neuro-X Lab, Department of Psychiatry and Behavioral Sciences, Medical University of South Carolina, Charleston, SC, USA.,Ralph H. Johnson VA Medical Center, Charleston, SC, USA.,Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, USA
| | - Dorothea Jenkins
- College of Medicine, Pediatrics, Medical University of South Carolina, Charleston, SC, USA
| | - Patricia Coker-Bolt
- Division of Occupational Therapy, Medical University of South Carolina, Charleston, SC, USA
| |
Collapse
|
6
|
Dhiman S, Fountain-Zaragoza S, Jensen JH, Falangola MF, McKinnon ET, Moss HG, Thorn KE, Rieter WJ, Spampinato MV, Nietert PJ, Helpern JA, Benitez A. Fiber Ball White Matter Modeling Reveals Microstructural Alterations in Healthy Brain Aging. Aging Brain 2022; 2:100037. [PMID: 36324695 PMCID: PMC9624504 DOI: 10.1016/j.nbas.2022.100037] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Age-related white matter degeneration is characterized by myelin breakdown and neuronal fiber loss that preferentially occur in regions that myelinate later in development. Conventional diffusion MRI (dMRI) has demonstrated age-related increases in diffusivity but provide limited information regarding the tissue-specific changes driving these effects. A recently developed dMRI biophysical modeling technique, Fiber Ball White Matter (FBWM) modeling, offers enhanced biological interpretability by estimating microstructural properties specific to the intra-axonal and extra-axonal spaces. We used FBWM to illustrate the biological mechanisms underlying changes throughout white matter in healthy aging using data from 63 cognitively unimpaired adults ages 45-85 with no radiological evidence of neurodegeneration or incipient Alzheimer's disease. Conventional dMRI and FBWM metrics were computed for two late-myelinating (genu of the corpus callosum and association tracts) and two early-myelinating regions (splenium of the corpus callosum and projection tracts). We examined the associations between age and these metrics in each region and tested whether age was differentially associated with these metrics in late- vs. early-myelinating regions. We found that conventional metrics replicated patterns of age-related increases in diffusivity in late-myelinating regions. FBWM additionally revealed specific intra- and extra-axonal changes suggestive of myelin breakdown and preferential loss of smaller-diameter axons, yielding in vivo corroboration of findings from histopathological studies of aged brains. These results demonstrate that advanced biophysical modeling approaches, such as FBWM, offer novel information about the microstructure-specific alterations contributing to white matter changes in healthy aging. These tools hold promise as sensitive indicators of early pathological changes related to neurodegenerative disease.
Collapse
Affiliation(s)
- Siddhartha Dhiman
- Department of Neuroscience, Medical University of South Carolina, Charleston, SC, USA
| | - Stephanie Fountain-Zaragoza
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, USA.,Department of Neurology, Medical University of South Carolina, Charleston, SC, USA
| | - Jens H Jensen
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, USA.,Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, SC, USA.,Department of Neuroscience, Medical University of South Carolina, Charleston, SC, USA
| | - Maria Fatima Falangola
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, USA.,Department of Neuroscience, Medical University of South Carolina, Charleston, SC, USA
| | - Emilie T McKinnon
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, USA.,Department of Neurology, Medical University of South Carolina, Charleston, SC, USA.,Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, SC, USA
| | - Hunter G Moss
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, USA.,Department of Neuroscience, Medical University of South Carolina, Charleston, SC, USA
| | - Kathryn E Thorn
- Department of Neuroscience, Medical University of South Carolina, Charleston, SC, USA
| | - William J Rieter
- Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, SC, USA
| | - Maria Vittoria Spampinato
- Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, SC, USA
| | - Paul J Nietert
- Department of Public Health Sciences, Medical University of South Carolina, Charleston, SC, USA
| | - Joseph A Helpern
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, USA.,Department of Neuroscience, Medical University of South Carolina, Charleston, SC, USA
| | - Andreana Benitez
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, USA.,Department of Neurology, Medical University of South Carolina, Charleston, SC, USA.,Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, SC, USA
| |
Collapse
|
7
|
Moss HG, Wolf LG, Coker-Bolt P, Ramakrishnan V, Aljuhani T, Yazdani M, Brown TR, Jensen JH, Jenkins DD. Quantitative Diffusion and Spectroscopic Neuroimaging Combined with a Novel Early-Developmental Assessment Improves Models for 1-Year Developmental Outcomes. AJNR Am J Neuroradiol 2022; 43:139-145. [PMID: 34949592 PMCID: PMC8757543 DOI: 10.3174/ajnr.a7370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Accepted: 09/27/2021] [Indexed: 01/03/2023]
Abstract
BACKGROUND AND PURPOSE Preterm infants are at risk for overt and silent CNS injury, with developmental consequences that are difficult to predict. The novel Specific Test of Early Infant Motor Performance, administered in preterm infants at term age, is indicative of later developmental gross motor and cognitive scores at 12 months. Here, we assessed whether functional performance on this early assessment correlates with CNS integrity via MR spectroscopy or diffusional kurtosis imaging and whether these quantitative neuroimaging methods improve predictions for future 12-month developmental scores. MATERIALS AND METHODS MR spectroscopy and quantitative diffusion MR imaging data were acquired in preterm infants (n = 16) at term. Testing was performed at term and 3 months using the Specific Test of Early Infant Motor Performance and the Bayley Scales of Infant and Toddler Development, Third Edition, at 12 months. We modeled the relationship of MR spectroscopy and diffusion MR imaging data with both test scores via multiple linear regression. RESULTS MR spectroscopy NAA ratios at a TE of 270 ms in the frontal WM and basal ganglia and kurtosis metrics in major WM tracts correlated strongly with total Specific Test of Early Infant Motor Performance scores. The addition of MR spectroscopy and diffusion separately improved the functional predictions of 12-month outcomes. CONCLUSIONS Microstructural integrity of the major WM tracts and metabolism in the basal ganglia and frontal WM strongly correlate with early developmental performance, suggesting that the Specific Test of Early Infant Motor Performance reflects CNS integrity after preterm birth. This study demonstrates that combining quantitative neuroimaging and early functional movement improves the prediction of 12-month outcomes in premature infants.
Collapse
Affiliation(s)
- H G Moss
- From the Department of Neuroscience (H.G.M., J.H.J.)
- Center for Biomedical Imaging (H.G.M., T.R.B., J.H.J., D.D.J.)
| | - L G Wolf
- Department of Pediatrics (L.G.W., D.D.J.)
| | - P Coker-Bolt
- Division of Occupational Therapy (P.C.-B., T.A.), College of Health Sciences
| | | | - T Aljuhani
- Division of Occupational Therapy (P.C.-B., T.A.), College of Health Sciences
- Division of Public Health Sciences (V.R., T.A.)
| | - M Yazdani
- Department of Radiology and Radiological Science (M.Y., T.R.B., J.H.J.), Medical University of South Carolina, Charleston, South Carolina
| | - T R Brown
- Center for Biomedical Imaging (H.G.M., T.R.B., J.H.J., D.D.J.)
- Department of Radiology and Radiological Science (M.Y., T.R.B., J.H.J.), Medical University of South Carolina, Charleston, South Carolina
| | - J H Jensen
- From the Department of Neuroscience (H.G.M., J.H.J.)
- Center for Biomedical Imaging (H.G.M., T.R.B., J.H.J., D.D.J.)
- Department of Radiology and Radiological Science (M.Y., T.R.B., J.H.J.), Medical University of South Carolina, Charleston, South Carolina
| | - D D Jenkins
- Center for Biomedical Imaging (H.G.M., T.R.B., J.H.J., D.D.J.)
- Department of Pediatrics (L.G.W., D.D.J.)
| |
Collapse
|
8
|
Jenkins DD, Moss HG, Brown TR, Yazdani M, Thayyil S, Montaldo P, Vento M, Kuligowski J, Wagner C, Hollis BW, Wiest DB. NAC and Vitamin D Improve CNS and Plasma Oxidative Stress in Neonatal HIE and Are Associated with Favorable Long-Term Outcomes. Antioxidants (Basel) 2021; 10:antiox10091344. [PMID: 34572976 PMCID: PMC8466838 DOI: 10.3390/antiox10091344] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 08/11/2021] [Accepted: 08/23/2021] [Indexed: 12/15/2022] Open
Abstract
N-acetylcysteine (NAC) and vitamin D provide effective neuroprotection in animal models of severe or inflammation-sensitized hypoxic ischemic encephalopathy (HIE). To translate these FDA-approved drugs to HIE neonates, we conducted an early phase, open-label trial of 10 days of NAC (25, 40 mg/kg q12h) + 1,25(OH)2D (calcitriol 0.05 mg/kg q12h, 0.03 mg/kg q24h), (NVD), for pharmacokinetic (PK) estimates during therapeutic hypothermia and normothermia. We paired PK samples with pharmacodynamic (PD) targets of plasma isoprostanoids, CNS glutathione (GSH) and total creatine (tCr) by serial MRS in basal ganglia (BG) before and after NVD infusion at five days. Infants had moderate (n = 14) or severe HIE (n = 16), funisitis (32%), and vitamin D deficiency (75%). NVD resulted in rapid, dose-responsive increases in CNS GSH and tCr that correlated positively with plasma [NAC], inversely with plasma isofurans, and was greater in infants with lower baseline [GSH] and [tCr], suggesting increases in these PD markers were titrated by neural demand. Hypothermia and normothermia altered NAC PK estimates. NVD was well tolerated. Excluding genetic syndromes (2), prolonged ECMO (2), lost-to-follow-up (1) and SIDS death (1), 24 NVD treated HIE infants have no evidence of cerebral palsy, autism or cognitive delay at 24–48 months. These data confirm that low, safe doses of NVD in HIE neonates decreased oxidative stress in plasma and CNS, improved CNS energetics, and are associated with favorable developmental outcomes at two to four years.
Collapse
Affiliation(s)
- Dorothea D Jenkins
- Division of Neonatology, Department of Pediatrics, Medical University of South Carolina, 10 McClennan Banks Drive, Charleston, SC 29425, USA; (C.W.); (B.W.H.)
- Correspondence: ; Tel.: +1-843-792-2112
| | - Hunter G Moss
- Center for Biomedical Imaging, Department of Radiology, Medical University of South Carolina, Charleston, SC 29425, USA; (H.G.M.); (T.R.B.); (M.Y.)
| | - Truman R Brown
- Center for Biomedical Imaging, Department of Radiology, Medical University of South Carolina, Charleston, SC 29425, USA; (H.G.M.); (T.R.B.); (M.Y.)
| | - Milad Yazdani
- Center for Biomedical Imaging, Department of Radiology, Medical University of South Carolina, Charleston, SC 29425, USA; (H.G.M.); (T.R.B.); (M.Y.)
| | - Sudhin Thayyil
- Centre for Perinatal Neuroscience, Imperial College London, London W12 0HS, UK; (S.T.); (P.M.)
| | - Paolo Montaldo
- Centre for Perinatal Neuroscience, Imperial College London, London W12 0HS, UK; (S.T.); (P.M.)
| | - Maximo Vento
- Neonatal Research Group, Health Research Institute Hospital La Fe, 46026 Valencia, Spain; (M.V.); (J.K.)
| | - Julia Kuligowski
- Neonatal Research Group, Health Research Institute Hospital La Fe, 46026 Valencia, Spain; (M.V.); (J.K.)
| | - Carol Wagner
- Division of Neonatology, Department of Pediatrics, Medical University of South Carolina, 10 McClennan Banks Drive, Charleston, SC 29425, USA; (C.W.); (B.W.H.)
| | - Bruce W Hollis
- Division of Neonatology, Department of Pediatrics, Medical University of South Carolina, 10 McClennan Banks Drive, Charleston, SC 29425, USA; (C.W.); (B.W.H.)
| | - Donald B Wiest
- Department of Clinical Pharmacy and Outcomes Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, SC 29425, USA;
| |
Collapse
|
9
|
Adams LE, Moss HG, Lowe DW, Brown T, Wiest DB, Hollis BW, Singh I, Jenkins DD. NAC and Vitamin D Restore CNS Glutathione in Endotoxin-Sensitized Neonatal Hypoxic-Ischemic Rats. Antioxidants (Basel) 2021; 10:489. [PMID: 33804757 PMCID: PMC8003885 DOI: 10.3390/antiox10030489] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 03/15/2021] [Accepted: 03/17/2021] [Indexed: 01/31/2023] Open
Abstract
Therapeutic hypothermia does not improve outcomes in neonatal hypoxia ischemia (HI) complicated by perinatal infection, due to well-described, pre-existing oxidative stress and neuroinflammation that shorten the therapeutic window. For effective neuroprotection post-injury, we must first define and then target CNS metabolomic changes immediately after endotoxin-sensitized HI (LPS-HI). We hypothesized that LPS-HI would acutely deplete reduced glutathione (GSH), indicating overwhelming oxidative stress in spite of hypothermia treatment in neonatal rats. Post-natal day 7 rats were randomized to sham ligation, or severe LPS-HI (0.5 mg/kg 4 h before right carotid artery ligation, 90 min 8% O2), followed by hypothermia alone or with N-acetylcysteine (25 mg/kg) and vitamin D (1,25(OH)2D3, 0.05 μg/kg) (NVD). We quantified in vivo CNS metabolites by serial 7T MR Spectroscopy before, immediately after LPS-HI, and after treatment, along with terminal plasma drug concentrations. GSH was significantly decreased in all LPS-HI rats compared with baseline and sham controls. Two hours of hypothermia alone did not improve GSH and allowed glutamate + glutamine (GLX) to increase. Within 1 h of administration, NVD increased GSH close to baseline and suppressed GLX. The combination of NVD with hypothermia rapidly improved cellular redox status after LPS-HI, potentially inhibiting important secondary injury cascades and allowing more time for hypothermic neuroprotection.
Collapse
Affiliation(s)
- Lauren E. Adams
- Department of Pediatrics, 10 McLellan Banks Dr, Medical University of South Carolina, Charleston, SC 29425, USA; (L.E.A.); (B.W.H.); (I.S.)
| | - Hunter G. Moss
- Center for Biomedical Imaging, Department of Radiology, Medical University of South Carolina, 68 President St. Room 205, Charleston, SC 29425, USA; (H.G.M.); (T.B.)
| | - Danielle W. Lowe
- Department of Psychiatry, Medical University of South Carolina, 67 Presidents St., MSC 861, Charleston, SC 29425, USA;
| | - Truman Brown
- Center for Biomedical Imaging, Department of Radiology, Medical University of South Carolina, 68 President St. Room 205, Charleston, SC 29425, USA; (H.G.M.); (T.B.)
| | - Donald B. Wiest
- Department of Pharmacy and Clinical Sciences, College of Pharmacy, Medical University of South Carolina, Charleston, SC 29425, USA;
| | - Bruce W. Hollis
- Department of Pediatrics, 10 McLellan Banks Dr, Medical University of South Carolina, Charleston, SC 29425, USA; (L.E.A.); (B.W.H.); (I.S.)
| | - Inderjit Singh
- Department of Pediatrics, 10 McLellan Banks Dr, Medical University of South Carolina, Charleston, SC 29425, USA; (L.E.A.); (B.W.H.); (I.S.)
| | - Dorothea D. Jenkins
- Department of Pediatrics, 10 McLellan Banks Dr, Medical University of South Carolina, Charleston, SC 29425, USA; (L.E.A.); (B.W.H.); (I.S.)
| |
Collapse
|
10
|
Moss HG, Jensen JH. Optimized rectification of fiber orientation density function. Magn Reson Med 2020; 85:444-455. [PMID: 32710476 DOI: 10.1002/mrm.28406] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 06/09/2020] [Accepted: 06/09/2020] [Indexed: 12/13/2022]
Abstract
PURPOSE To demonstrate an optimized rectification strategy for fiber orientation density functions (fODFs). THEORY AND METHODS In white matter, fODFs can be estimated with diffusion MRI. However, because of signal noise, imaging artifacts and other factors, experimentally determined fODFs may take on unphysical negative values in some directions. Here, we show how to rectify such fODFs to eliminate all negative values while minimizing the mean square difference between the original and rectified fODFs. The method is demonstrated for a mathematical model and for fODFs estimated from experimental human data using both constrained spherical deconvolution and fiber ball imaging. Comparison with an alternative nonoptimized rectification approach is also provided. RESULTS For the mathematical model, it is found that the optimized rectification procedure removes negative fODF values while at the same time reducing the mean square error. Relative to the alternative rectification approach, the optimized fODFs are substantially more accurate. For the experimental data, the optimized fODFs have a lower average fractional anisotropy axonal and often fewer small peaks than the original, unrectified fODFs. The calculation of optimized fODFs is straightforward where the main step is the finding of the root to an equation in one variable, as may be efficiently accomplished with the bisection method. CONCLUSION Unphysical negative fODF values can be easily eliminated in a manner that minimizes the mean square difference between the original and rectified fODFs. Optimized fODF rectification may be useful in applications for which negative values are problematic.
Collapse
Affiliation(s)
- Hunter G Moss
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, USA.,Department of Neuroscience, Medical University of South Carolina, Charleston, SC, USA
| | - Jens H Jensen
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, USA.,Department of Neuroscience, Medical University of South Carolina, Charleston, SC, USA.,Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, SC, USA
| |
Collapse
|
11
|
Ward P, Moss HG, Brown TR, Kalivas P, Jenkins DD. N-acetylcysteine mitigates acute opioid withdrawal behaviors and CNS oxidative stress in neonatal rats. Pediatr Res 2020; 88:77-84. [PMID: 31935745 PMCID: PMC7326708 DOI: 10.1038/s41390-019-0728-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Revised: 11/04/2019] [Accepted: 11/21/2019] [Indexed: 01/12/2023]
Abstract
BACKGROUND Neonatal abstinence syndrome (NAS) is a significant problem. Opioid withdrawal induces oxidative stress and disrupts glutamate and glutathione homeostasis. We hypothesized that N-acetylcysteine (NAC) administered during acute opioid withdrawal in neonatal rats would decrease withdrawal behaviors and normalize CNS glutathione and glutamate. METHODS Osmotic minipumps with methadone (opioid dependent, OD) and saline (Sham) were implanted into Sprague Dawley dams 7 days prior to delivery. Pups were randomized to receive either naloxone plus saline or NAC (50-100 mg/kg), administered on postnatal day (PND) 7. We performed MR spectroscopy on PND6-7 before, 30 min, and 120 min after withdrawal. On PND7, we assessed withdrawal behaviors for 90 min after naloxone administration and summed scores during peak withdrawal period. RESULTS Mean summed behavioral scores were significantly different between groups (χ2 (2) = 10.49, p = 0.005) but not different between NAC/NAL/OD and Sham (p = 0.14): SAL/NAL/OD = 17.2 ± 4.2 (n = 10); NAC/NAL/OD = 11.3 ± 5.6 (n = 9); Sham = 6.5 ± 0.6 (n = 4). SAL/NAL/OD pups had decreased glutathione at 120 min (p = 0.01), while NAC/NAL/OD pups maintained pre-withdrawal glutathione (p = 0.26). CONCLUSION In antenatal OD, NAC maintains CNS glutathione and mitigates acute opioid withdrawal in neonatal rats. This is the first study to demonstrate acute opioid withdrawal neurochemical changes in vivo in neonatal OD. NAC is a potential novel treatment for NAS.
Collapse
Affiliation(s)
- Price Ward
- 0000 0001 2189 3475grid.259828.cDepartment of Pediatrics, Medical University of South Carolina, Charleston, SC USA
| | - Hunter G. Moss
- 0000 0001 2189 3475grid.259828.cDepartment of Neuroscience, Medical University of South Carolina, Charleston, SC USA
| | - Truman R. Brown
- 0000 0001 2189 3475grid.259828.cDepartment of Radiology, Medical University of South Carolina, Charleston, SC USA
| | - Peter Kalivas
- 0000 0001 2189 3475grid.259828.cDepartment of Neuroscience, Medical University of South Carolina, Charleston, SC USA
| | - Dorothea D. Jenkins
- 0000 0001 2189 3475grid.259828.cDepartment of Pediatrics, Medical University of South Carolina, Charleston, SC USA
| |
Collapse
|
12
|
Ramanna S, Moss HG, McKinnon ET, Yacoub E, Helpern JA, Jensen JH. Triple diffusion encoding MRI predicts intra-axonal and extra-axonal diffusion tensors in white matter. Magn Reson Med 2019; 83:2209-2220. [PMID: 31763730 DOI: 10.1002/mrm.28084] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 10/24/2019] [Accepted: 10/25/2019] [Indexed: 12/17/2022]
Abstract
PURPOSE To demonstrate how triple diffusion encoding (TDE) MRI can be applied to separately estimate the intra-axonal and extra-axonal diffusion tensors in white matter (WM). METHODS Using a TDE pulse sequence with an axially symmetric b-matrix, diffusion MRI data were acquired at 3T for 3 healthy adults with an axial b-value of 4000 s/mm2 , a radial b-value of 307 s/mm2 , and 64 diffusion encoding directions. This acquisition was then repeated with the radial b-value set to 0. A previously proposed theory was applied to these data in order to estimate the intra-axonal diffusivity and axonal water fraction for each WM voxel. Conventional single diffusion encoding data were also obtained with b-values of 1000 and 2000 s/mm2 , which provided additional information sufficient for determining both the intra-axonal and extra-axonal diffusion tensors. RESULTS From the TDE data, the average intra-axonal diffusivity in WM was found to be 2.24 ± 0.18 µm2 /ms, and the average axonal water fraction was found to be 0.60 ± 0.11. From the 2 diffusion tensors, average WM values were estimated for several compartment-specific diffusion parameters. In particular, the extra-axonal mean diffusivity was 1.09 ± 0.19 µm2 /ms, the intra-axonal fractional anisotropy was 0.50 ± 0.14, and the extra-axonal fractional anisotropy was 0.23 ± 0.13. CONCLUSION By using a simple TDE pulse sequence with an axially symmetric b-matrix, the diffusion tensors for the intra-axonal and extra-axonal spaces can be separately estimated in adult WM. This allows one to determine compartment-specific diffusion properties for these 2 water pools.
Collapse
Affiliation(s)
- Sudhir Ramanna
- Department of Radiology, Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota
| | - Hunter G Moss
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, South Carolina.,Department of Neuroscience, Medical University of South Carolina, Charleston, South Carolina
| | - Emilie T McKinnon
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, South Carolina.,Department of Neuroscience, Medical University of South Carolina, Charleston, South Carolina.,Department of Neurology, Medical University of South Carolina, Charleston, South Carolina
| | - Essa Yacoub
- Department of Radiology, Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, Minnesota
| | - Joseph A Helpern
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, South Carolina.,Department of Neuroscience, Medical University of South Carolina, Charleston, South Carolina.,Department of Neurology, Medical University of South Carolina, Charleston, South Carolina.,Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, South Carolina
| | - Jens H Jensen
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, South Carolina.,Department of Neuroscience, Medical University of South Carolina, Charleston, South Carolina.,Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, South Carolina
| |
Collapse
|
13
|
Moss HG, McKinnon ET, Glenn GR, Helpern JA, Jensen JH. Optimization of data acquisition and analysis for fiber ball imaging. Neuroimage 2019; 200:690-703. [PMID: 31284026 DOI: 10.1016/j.neuroimage.2019.07.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 05/29/2019] [Accepted: 07/02/2019] [Indexed: 11/25/2022] Open
Abstract
The inverse Funk transform of high angular resolution diffusion imaging (HARDI) data provides an estimate for the fiber orientation density function (fODF) in white matter (WM). Since the inverse Funk transform is a straightforward linear transformation, this technique, referred to as fiber ball imaging (FBI), offers a practical means of calculating the fODF that avoids the need for a response function or nonlinear numerical fitting. Nevertheless, the accuracy of FBI depends on both the choice of b-value and the number of diffusion-encoding directions used to acquire the HARDI data. To inform the design of optimal scan protocols for its implementation, FBI predictions are investigated here with in vivo data from healthy adult volunteers acquired at 3 T for b-values spanning 1000 to 10,000 s/mm2, for diffusion-encoding directions varying in number from 30 to 256 and for TE ranging from 90 to 120 ms. Our results suggest b-values above 4000 s/mm2 with at least 64 diffusion-encoding directions are adequate to achieve reasonable accuracy with FBI for calculating axon-specific diffusion measures and for performing WM fiber tractography (WMFT).
Collapse
Affiliation(s)
- Hunter G Moss
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, USA; Department of Neuroscience, Medical University of South Carolina, Charleston, SC, USA
| | - Emilie T McKinnon
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, USA; Department of Neuroscience, Medical University of South Carolina, Charleston, SC, USA; Department of Neurology, Medical University of South Carolina, Charleston, SC, USA
| | - G Russell Glenn
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, USA; Department of Neuroscience, Medical University of South Carolina, Charleston, SC, USA; Department of Neurology, Medical University of South Carolina, Charleston, SC, USA; Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, SC, USA; Department of Internal Medicine, Palmetto Health Richland Hospital, University of South Carolina School of Medicine, Columbia, SC, USA
| | - Joseph A Helpern
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, USA; Department of Neuroscience, Medical University of South Carolina, Charleston, SC, USA; Department of Neurology, Medical University of South Carolina, Charleston, SC, USA; Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, SC, USA
| | - Jens H Jensen
- Center for Biomedical Imaging, Medical University of South Carolina, Charleston, SC, USA; Department of Neuroscience, Medical University of South Carolina, Charleston, SC, USA; Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, SC, USA.
| |
Collapse
|
14
|
Moss HG, Jenkins DD, Yazdani M, Brown TR. Identifying the translational complexity of magnetic resonance spectroscopy in neonates and infants. NMR Biomed 2019; 32:e4089. [PMID: 30924565 PMCID: PMC6593752 DOI: 10.1002/nbm.4089] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 02/04/2019] [Accepted: 02/07/2019] [Indexed: 06/09/2023]
Abstract
Little attention has been paid to relating MRS outputs of vendor-supplied platforms to those from research software. This comparison is crucial to advance MRS as a clinical prognostic tool for disease or injury, recovery, and outcome. The work presented here investigates the agreement between metabolic ratios reported from vendor-provided and LCModel fitting algorithms using MRS data obtained on Siemens 3 T TIM Trio and 3 T Skyra MRI scanners in a total of 55 premature infants and term neonates with hypoxic ischemic encephalopathy (HIE). We compared peak area ratios in single voxels placed in basal ganglia (BG) and frontal white matter (WM) using standard PRESS (TE = 30 ms and 270 ms) and STEAM (TE = 20 ms) MRS sequences at multiple times after birth from 5 to 60 days. A total of 74 scans met quality standards for inclusion, reflecting a spectrum of neonatal disease and several months of early infant development. For the long TE PRESS sequence, N-acetylaspartate (NAA) and Choline (Cho) ratios to Creatine (Cr) correlated strongly between LCModel and vendor-supplied software in the BG. For shorter TEs, the ratios of NAA/Cr and Cho/Cr were more closely related using STEAM at TE = 20 ms in BG and WM, which was significantly better than using PRESS at TE = 30 ms in the BG of HIE infants. At short TEs, however, it is still unclear which MRS sequence, STEAM or PRESS, is superior and thus more work is required in this regard for translating research-generated MRS ratios to clinical diagnosis and prognostication, and unlocking the potential of MRS for in vivo metabolomics. MRS at both long and short TEs is desirable for standard metabolites such as NAA, Cho and Cr, along with important lower concentration metabolites such as myo-inositol and glutathione.
Collapse
Affiliation(s)
- Hunter G. Moss
- Department of RadiologyMedical University of South CarolinaCharlestonSouth Carolina
| | - Dorothea D. Jenkins
- Department of PediatricsMedical University of South CarolinaCharlestonSouth Carolina
| | - Milad Yazdani
- Department of RadiologyMedical University of South CarolinaCharlestonSouth Carolina
| | - Truman R. Brown
- Department of RadiologyMedical University of South CarolinaCharlestonSouth Carolina
| |
Collapse
|
15
|
Moss HG, Brown TR, Wiest DB, Jenkins DD. N-Acetylcysteine rapidly replenishes central nervous system glutathione measured via magnetic resonance spectroscopy in human neonates with hypoxic-ischemic encephalopathy. J Cereb Blood Flow Metab 2018; 38:950-958. [PMID: 29561203 PMCID: PMC5999009 DOI: 10.1177/0271678x18765828] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Accepted: 02/19/2018] [Indexed: 01/02/2023]
Abstract
Persistent oxidative stress depletes reduced glutathione (GSH), an intracellular antioxidant and an important determinant of CNS injury after hypoxia ischemia. We used standard, short echo time Stimulated Echo Acquisition Mode (STEAM) to detect GSH by magnetic resonance spectroscopy (MRS) in 24 term neonates with hypoxic-ischemic encephalopathy (HIE), on day of life 5-6, after rewarming from therapeutic hypothermia. MRS demonstrated reliable, consistent GSH of 1·64 ± 0·20 mM in the basal ganglia immediately before intravenous infusion of N-acetylcysteine. N-acetylcysteine resulted in a rapid and significant GSH increase to 1·93 ± 0.23 mM within 12-30 min after completion of infusion ( n = 21, p < 0.0001, paired t-test), compared with those who did not receive N-acetylcysteine ( n = 3, GSH = 1.66 ± 0.06 mM and 1.64 ± 0.09 mM). In one perinatal stroke patient, GSH in the diffusion-restricted stroke area was 1.0 mM, indicating significant compromise of intracellular redox potential, which also improved after N-acetylcysteine. For comparison, GSH in healthy term neonates has been reported at 2.5 ± 0.9 mM in the thalamus. This is the first report to show persistent oxidative stress reflected in GSH during the subacute phase in neonates with HIE and rapid response to N-acetylcysteine, using a short echo MRS sequence that is available on all clinical scanners without spectral editing.
Collapse
MESH Headings
- Acetylcysteine/administration & dosage
- Adult
- Female
- Glutathione/metabolism
- Humans
- Hypothermia, Induced
- Hypoxia-Ischemia, Brain/diagnosis
- Hypoxia-Ischemia, Brain/metabolism
- Hypoxia-Ischemia, Brain/therapy
- Infant
- Infant, Newborn
- Infant, Newborn, Diseases/diagnosis
- Infant, Newborn, Diseases/metabolism
- Infant, Newborn, Diseases/therapy
- Magnetic Resonance Spectroscopy
- Male
- Oxidation-Reduction/drug effects
- Stroke/diagnosis
- Stroke/metabolism
- Stroke/therapy
Collapse
Affiliation(s)
- Hunter G Moss
- Department of Radiology, Medical University of South Carolina, Charleston, SC, USA
| | - Truman R Brown
- Department of Radiology, Medical University of South Carolina, Charleston, SC, USA
| | - Donald B Wiest
- Department of Pharmacy, Medical University of South Carolina, Charleston, SC, USA
| | - Dorothea D Jenkins
- Department of Pediatrics, Medical University of South Carolina, Charleston, SC, USA
| |
Collapse
|