Publications

1. Roy B, Ogren JA, Allen LA, Diehl B, Sankar R, Lhatoo SD, Kumar R, Harper RM. Brain gray matter changes in children at risk for sudden unexpected death in epilepsy.. Pediatric research, 2024.
2. Pike NA, Avedissian T, Halnon NH, Lewis AB, Kumar R. Low pre-albumin but not thiamine predicts cognitive deficits in adolescents post-Fontan and healthy controls.. Cardiology in the young, 2023.
3. Roy B, Vacas S, Ehlert L, Townsley M, Carrier M, Fonarow GC, Woo MA, Kumar R. Heart failure-induced brain myelin changes and differences between sexes.. Journal of neuroscience research, 2023.
4. Roy B, Choi SE, Freeby MJ, Kumar R. Microstructural brain tissue changes contribute to cognitive and mood deficits in adults with type 2 diabetes mellitus.. Scientific reports, 2023.
5. Vandiver MS, Roy B, Mahmud F, Lavretsky H, Kumar R. Functional comorbidities and brain tissue changes before and after lung transplant in adults.. Frontiers in cellular neuroscience, 2022.
6. Sahib A, Roy B, Kang D, Aysola RS, Wen E, Kumar R. Relationships between brain tissue damage, oxygen desaturation, and disease severity in obstructive sleep apnea evaluated by diffusion tensor imaging.. Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine, 2022.
7. Roy B, Sahib AK, Kang D, Aysola RS, Kumar R. Brain tissue integrity mapping in adults with obstructive sleep apnea using T1-weighted and T2-weighted images.. Therapeutic advances in neurological disorders, 2022.
8. Pang B, Doshi S, Roy B, Lai M, Ehlert L, Aysola RS, Kang DW, Anderson A, Joshi SH, Tward D, Scalzo F, Vacas S, Kumar R. Machine learning approach for obstructive sleep apnea screening using brain diffusion tensor imaging.. Journal of sleep research, 2022.
9. Ogren JA, Allen LA, Roy B, Diehl B, Stern JM, Eliashiv DS, Lhatoo SD, Harper RM, Kumar R. Regional variation in brain tissue texture in patients with tonic-clonic seizures.. PloS one, 2022.
10. Roy B, Nunez A, Aysola RS, Kang DW, Vacas S, Kumar R. Impaired Glymphatic System Actions in Obstructive Sleep Apnea Adults.. Frontiers in neuroscience, 2022.
11. Song X, Roy B, Vacas S, Woo MA, Kang DW, Aysola RS, Kumar R. Brain regional homogeneity changes after short-term positive airway pressure treatment in patients with obstructive sleep apnea.. Sleep medicine, 2022.
12. Roy B, Woo MS, Vacas S, Eshaghian P, Rao AP, Kumar R. Regional brain tissue changes in patients with cystic fibrosis.. Journal of translational medicine, 2021.
13. Cabrera-Mino C, Roy B, Woo MA, Freeby MJ, Kumar R, Choi SE. Poor Sleep Quality Linked to Decreased Brain Gray Matter Density in Adults with Type 2 Diabetes.. Sleep and vigilance, 2021.
14. Pal A, Ogren JA, Aysola RS, Kumar R, Henderson LA, Harper RM, Macey PM. Insular functional organization during handgrip in females and males with obstructive sleep apnea.. PloS one, 2021.
15. Roy B, Vacas S, Ehlert L, McCloy K, Saggar R, Kumar R. Brain Structural Changes in Patients with Pulmonary Arterial Hypertension.. Journal of neuroimaging : official journal of the American Society of Neuroimaging, 2021.
16. Pal A, Ogren JA, Aguila AP, Aysola R, Kumar R, Henderson LA, Harper RM, Macey PM. Functional organization of the insula in men and women with obstructive sleep apnea during Valsalva.. Sleep, 2021.
17. Pike NA, Roy B, Moye S, Cabrera-Mino C, Woo MA, Halnon NJ, Lewis AB, Kumar R. Reduced hippocampal volumes and memory deficits in adolescents with single ventricle heart disease.. Brain and behavior, 2021.
18. Roy B, Ehlert L, Mullur R, Freeby MJ, Woo MA, Kumar R, Choi S. Regional Brain Gray Matter Changes in Patients with Type 2 Diabetes Mellitus.. Scientific reports, 2020.
19. Noorani S, Roy B, Sahib AK, Cabrera-Mino C, Halnon NJ, Woo MA, Lewis AB, Pike NA, Kumar R. Caudate nuclei volume alterations and cognition and mood dysfunctions in adolescents with single ventricle heart disease.. Journal of neuroscience research, 2020.
20. Choi SE, Roy B, Freeby M, Mullur R, Woo MA, Kumar R. Prefrontal cortex brain damage and glycemic control in patients with type 2 diabetes.. Journal of diabetes, 2020.
21. Choi S, Roy B, Kumar R, Fonarow GC, Woo MA. Heart Failure Self-care Associated With Brain Injury in Executive Control Regions.. The Journal of cardiovascular nursing, 2019.
22. Cabrera-Mino C, Roy B, Woo MA, Singh S, Moye S, Halnon NJ, Lewis AB, Kumar R, Pike NA. Reduced brain mammillary body volumes and memory deficits in adolescents who have undergone the Fontan procedure.. Pediatric research, 2019.
23. Song X, Roy B, Lai M, Sahib A, Fonarow GC, Woo MA, Kumar R. Aberrant Brain Functional Connectivity Dynamic Responses to the Valsalva Maneuver in Heart Failure.. Journal of cardiac failure, 2019.
24. Singh S, Roy B, Pike N, Daniel E, Ehlert L, Lewis AB, Halnon N, Woo MA, Kumar R. Altered brain diffusion tensor imaging indices in adolescents with the Fontan palliation.. Neuroradiology, 2019.
25. Song X, Woo MA, Kumar R. Aberrant left insular cortex response: A possible pathogenesis of reduced vagal nervous system activity in heart failure?-Reply.. Journal of neuroscience research, 2018.
26. Song X, Roy B, Fonarow GC, Woo MA, Kumar R. Brain structural changes associated with aberrant functional responses to the Valsalva maneuver in heart failure.. Journal of neuroscience research, 2018.
27. Macey PM, Prasad JP, Ogren JA, Moiyadi AS, Aysola RS, Kumar R, Yan-Go FL, Woo MA, Albert Thomas M, Harper RM. Sex-specific hippocampus volume changes in obstructive sleep apnea.. NeuroImage. Clinical, 2018.
28. Ogren JA, Tripathi R, Macey PM, Kumar R, Stern JM, Eliashiv DS, Allen LA, Diehl B, Engel J, Rani MRS, Lhatoo SD, Harper RM. Regional cortical thickness changes accompanying generalized tonic-clonic seizures.. NeuroImage. Clinical, 2018.
29. Tom C, Roy B, Vig R, Kang DW, Aysola RS, Woo MA, Harper RM, Kumar R. Correlations between Waist and Neck Circumferences and Obstructive Sleep Apnea Characteristics.. Sleep and vigilance, 2018.
30. Song X, Roy B, Kang DW, Aysola RS, Macey PM, Woo MA, Yan-Go FL, Harper RM, Kumar R. Altered resting-state hippocampal and caudate functional networks in patients with obstructive sleep apnea.. Brain and behavior, 2018.
31. Macey PM, Haris N, Kumar R, Thomas MA, Woo MA, Harper RM. Obstructive sleep apnea and cortical thickness in females and males.. PloS one, 2018.
32. Macey PM, Kheirandish-Gozal L, Prasad JP, Ma RA, Kumar R, Philby MF, Gozal D. Altered Regional Brain Cortical Thickness in Pediatric Obstructive Sleep Apnea.. Frontiers in neurology, 2018.
33. Pike NA, Roy B, Gupta R, Singh S, Woo MA, Halnon NJ, Lewis AB, Kumar R. Brain abnormalities in cognition, anxiety, and depression regulatory regions in adolescents with single ventricle heart disease.. Journal of neuroscience research, 2018.
34. Singh S, Kumar R, Roy B, Woo MA, Lewis A, Halnon N, Pike N. Regional brain gray matter changes in adolescents with single ventricle heart disease.. Neuroscience letters, 2017.
35. Roy B, Woo M, Kumar R. Cerebral blood flow in the central autonomic network: is there any effect of hemispheric lateralization in patients with heart failure? Reply.. European journal of heart failure, 2017.
36. Roy B, Woo MA, Wang DJJ, Fonarow GC, Harper RM, Kumar R. Reduced regional cerebral blood flow in patients with heart failure.. European journal of heart failure, 2017.
37. Macey PM, Rieken NS, Ogren JA, Macey KE, Kumar R, Harper RM. Sex differences in insular cortex gyri responses to a brief static handgrip challenge.. Biology of sex differences, 2017.
38. Tummala S, Roy B, Vig R, Park B, Kang DW, Woo MA, Aysola R, Harper RM, Kumar R. Non-Gaussian Diffusion Imaging Shows Brain Myelin and Axonal Changes in Obstructive Sleep Apnea.. Journal of computer assisted tomography, 2017.
39. Pike NA, Woo MA, Poulsen MK, Evangelista W, Faire D, Halnon NJ, Lewis AB, Kumar R. Predictors of Memory Deficits in Adolescents and Young Adults with Congenital Heart Disease Compared to Healthy Controls.. Frontiers in pediatrics, 2016.
40. Tummala S, Roy B, Park B, Kang DW, Woo MA, Harper RM, Kumar R. Associations between brain white matter integrity and disease severity in obstructive sleep apnea.. Journal of neuroscience research, 2016.
41. Shivkumar K, Ajijola OA, Anand I, Armour JA, Chen PS, Esler M, De Ferrari GM, Fishbein MC, Goldberger JJ, Harper RM, Joyner MJ, Khalsa SS, Kumar R, Lane R, Mahajan A, Po S, Schwartz PJ, Somers VK, Valderrabano M, Vaseghi M, Zipes DP. Clinical neurocardiology defining the value of neuroscience-based cardiovascular therapeutics.. The Journal of physiology, 2016.
42. Macey PM, Rieken NS, Kumar R, Ogren JA, Middlekauff HR, Wu P, Woo MA, Harper RM. Sex Differences in Insular Cortex Gyri Responses to the Valsalva Maneuver.. Frontiers in neurology, 2016.
43. Park B, Roy B, Woo MA, Palomares JA, Fonarow GC, Harper RM, Kumar R. Lateralized Resting-State Functional Brain Network Organization Changes in Heart Failure.. PloS one, 2016.
44. Park B, Palomares JA, Woo MA, Kang DW, Macey PM, Yan-Go FL, Harper RM, Kumar R. Aberrant Insular Functional Network Integrity in Patients with Obstructive Sleep Apnea.. Sleep, 2016.
45. Park B, Palomares JA, Woo MA, Kang DW, Macey PM, Yan-Go FL, Harper RM, Kumar R. Disrupted functional brain network organization in patients with obstructive sleep apnea.. Brain and behavior, 2016.
46. Macey PM, Ogren JA, Kumar R, Harper RM. Functional Imaging of Autonomic Regulation: Methods and Key Findings.. Frontiers in neuroscience, 2016.
47. Tummala S, Palomares J, Kang DW, Park B, Woo MA, Harper RM, Kumar R. Global and Regional Brain Non-Gaussian Diffusion Changes in Newly Diagnosed Patients with Obstructive Sleep Apnea.. Sleep, 2016.
48. Harper RM, Kumar R, Macey PM, Harper RK, Ogren JA. Impaired neural structure and function contributing to autonomic symptoms in congenital central hypoventilation syndrome.. Frontiers in neuroscience, 2015.
49. Palomares JA, Tummala S, Wang DJ, Park B, Woo MA, Kang DW, St Lawrence KS, Harper RM, Kumar R. Water Exchange across the Blood-Brain Barrier in Obstructive Sleep Apnea: An MRI Diffusion-Weighted Pseudo-Continuous Arterial Spin Labeling Study.. Journal of neuroimaging : official journal of the American Society of Neuroimaging, 2015.
50. Kumar R, Yadav SK, Palomares JA, Park B, Joshi SH, Ogren JA, Macey PM, Fonarow GC, Harper RM, Woo MA. Reduced regional brain cortical thickness in patients with heart failure.. PloS one, 2015.
51. Woo MA, Ogren JA, Abouzeid CM, Macey PM, Sairafian KG, Saharan PS, Thompson PM, Fonarow GC, Hamilton MA, Harper RM, Kumar R. Regional hippocampal damage in heart failure.. European journal of heart failure, 2015.
52. Woo MA, Palomares JA, Macey PM, Fonarow GC, Harper RM, Kumar R. Global and regional brain mean diffusivity changes in patients with heart failure.. Journal of neuroscience research, 2014.
53. Woo MA, Yadav SK, Macey PM, Fonarow GC, Harper RM, Kumar R. Brain metabolites in autonomic regulatory insular sites in heart failure.. Journal of the neurological sciences, 2014.
54. Macey PM, Kumar R, Ogren JA, Woo MA, Harper RM. Global brain blood-oxygen level responses to autonomic challenges in obstructive sleep apnea.. PloS one, 2014.
55. Serber SL, Rinsky B, Kumar R, Macey PM, Fonarow GC, Harper RM. Cerebral blood flow velocity and vasomotor reactivity during autonomic challenges in heart failure.. Nursing research, 2014.
56. Yadav SK, Kumar R, Macey PM, Woo MA, Yan-Go FL, Harper RM. Insular cortex metabolite changes in obstructive sleep apnea.. Sleep, 2014.
57. Kumar R, Pham TT, Macey PM, Woo MA, Yan-Go FL, Harper RM. Abnormal myelin and axonal integrity in recently diagnosed patients with obstructive sleep apnea.. Sleep, 2014.
58. Kumar R, Farahvar S, Ogren JA, Macey PM, Thompson PM, Woo MA, Yan-Go FL, Harper RM. Brain putamen volume changes in newly-diagnosed patients with obstructive sleep apnea.. NeuroImage. Clinical, 2014.
59. Harper RM, Kumar R, Macey PM, Woo MA, Ogren JA. Affective brain areas and sleep-disordered breathing.. Progress in brain research, 2014.
60. Sarma MK, Nagarajan R, Keller MA, Kumar R, Nielsen-Saines K, Michalik DE, Deville J, Church JA, Thomas MA. Regional brain gray and white matter changes in perinatally HIV-infected adolescents.. NeuroImage. Clinical, 2013.
61. Macey PM, Kumar R, Woo MA, Yan-Go FL, Harper RM. Heart rate responses to autonomic challenges in obstructive sleep apnea.. PloS one, 2013.
62. Yadav SK, Kumar R, Macey PM, Richardson HL, Wang DJ, Woo MA, Harper RM. Regional cerebral blood flow alterations in obstructive sleep apnea.. Neuroscience letters, 2013.
63. Richardson HL, Macey PM, Kumar R, Valladares EM, Woo MA, Harper RM. Neural and physiological responses to a cold pressor challenge in healthy adolescents.. Journal of neuroscience research, 2013.
64. Harper RM, Kumar R, Ogren JA, Macey PM. Sleep-disordered breathing: effects on brain structure and function.. Respiratory physiology & neurobiology, 2013.
65. Kumar R, Chavez AS, Macey PM, Woo MA, Harper RM. Brain axial and radial diffusivity changes with age and gender in healthy adults.. Brain research, 2013.
66. Pan A, Kumar R, Macey PM, Fonarow GC, Harper RM, Woo MA. Visual assessment of brain magnetic resonance imaging detects injury to cognitive regulatory sites in patients with heart failure.. Journal of cardiac failure, 2013.
67. Ogren JA, Macey PM, Kumar R, Fonarow GC, Hamilton MA, Harper RM, Woo MA. Impaired cerebellar and limbic responses to the valsalva maneuver in heart failure.. Cerebellum (London, England), 2012.
68. Macey PM, Kumar R, Yan-Go FL, Woo MA, Harper RM. Sex differences in white matter alterations accompanying obstructive sleep apnea.. Sleep, 2012.
69. Harper RM, Kumar R, Macey PM, Ogren JA, Richardson HL. Functional neuroanatomy and sleep-disordered breathing: implications for autonomic regulation.. Anatomical record (Hoboken, N.J. : 2007), 2012.
70. Kumar R, Chavez AS, Macey PM, Woo MA, Yan-Go FL, Harper RM. Altered global and regional brain mean diffusivity in patients with obstructive sleep apnea.. Journal of neuroscience research, 2012.
71. Macey PM, Wu P, Kumar R, Ogren JA, Richardson HL, Woo MA, Harper RM. Differential responses of the insular cortex gyri to autonomic challenges.. Autonomic neuroscience : basic & clinical, 2012.
72. Kumar R, Woo MS, Macey PM, Woo MA, Harper RM. Progressive gray matter changes in patients with congenital central hypoventilation syndrome.. Pediatric research, 2012.
73. Kumar R, Delshad S, Woo MA, Macey PM, Harper RM. Age-related regional brain T2-relaxation changes in healthy adults.. Journal of magnetic resonance imaging : JMRI, 2011.
74. Macey PM, Moiyadi AS, Kumar R, Woo MA, Harper RM. Decreased cortical thickness in central hypoventilation syndrome.. Cerebral cortex (New York, N.Y. : 1991), 2011.
75. Kumar R, Nguyen HD, Macey PM, Woo MA, Harper RM. Regional brain axial and radial diffusivity changes during development.. Journal of neuroscience research, 2011.
76. Kumar R, Woo MA, Macey PM, Fonarow GC, Hamilton MA, Harper RM. Brain axonal and myelin evaluation in heart failure.. Journal of the neurological sciences, 2011.
77. Kumar R, Nguyen HD, Ogren JA, Macey PM, Thompson PM, Fonarow GC, Hamilton MA, Harper RM, Woo MA. Global and regional putamen volume loss in patients with heart failure.. European journal of heart failure, 2011.
78. Kumar R, Delshad S, Macey PM, Woo MA, Harper RM. Development of T2-relaxation values in regional brain sites during adolescence.. Magnetic resonance imaging, 2010.
79. Kumar R, Macey PM, Woo MA, Harper RM. Rostral brain axonal injury in congenital central hypoventilation syndrome.. Journal of neuroscience research, 2010.
80. Singhal A, Nagarajan R, Hinkin CH, Kumar R, Sayre J, Elderkin-Thompson V, Huda A, Gupta RK, Han SH, Thomas MA. Two-dimensional MR spectroscopy of minimal hepatic encephalopathy and neuropsychological correlates in vivo.. Journal of magnetic resonance imaging : JMRI, 2010.
81. Macey PM, Kumar R, Ogren JA, Woo MA, Harper RM. Images in sleep medicine. Altered cerebral blood flow in a patient with congenital central hypoventilation syndrome.. Sleep medicine, 2010.
82. Macey PM, Woo MA, Kumar R, Cross RL, Harper RM. Relationship between obstructive sleep apnea severity and sleep, depression and anxiety symptoms in newly-diagnosed patients.. PloS one, 2010.
83. Singhal A, Nagarajan R, Kumar R, Huda A, Gupta RK, Thomas MA. Magnetic resonance T2-relaxometry and 2D L-correlated spectroscopy in patients with minimal hepatic encephalopathy.. Journal of magnetic resonance imaging : JMRI, 2009.
84. Kumar R, Nguyen HD, Macey PM, Woo MA, Harper RM. Dilated basilar arteries in patients with congenital central hypoventilation syndrome.. Neuroscience letters, 2009.
85. Kumar R, Lee K, Macey PM, Woo MA, Harper RM. Mammillary body and fornix injury in congenital central hypoventilation syndrome.. Pediatric research, 2009.
86. Macey PM, Richard CA, Kumar R, Woo MA, Ogren JA, Avedissian C, Thompson PM, Harper RM. Hippocampal volume reduction in congenital central hypoventilation syndrome.. PloS one, 2009.
87. Kumar R, Macey PM, Cross RL, Woo MA, Yan-Go FL, Harper RM. Neural alterations associated with anxiety symptoms in obstructive sleep apnea syndrome.. Depression and anxiety, 2009.
88. Woo MA, Kumar R, Macey PM, Fonarow GC, Harper RM. Brain injury in autonomic, emotional, and cognitive regulatory areas in patients with heart failure.. Journal of cardiac failure, 2008.
89. Kumar R, Woo MA, Birrer BV, Macey PM, Fonarow GC, Hamilton MA, Harper RM. Mammillary bodies and fornix fibers are injured in heart failure.. Neurobiology of disease, 2008.
90. Kumar R, Macey PM, Woo MA, Alger JR, Harper RM. Diffusion tensor imaging demonstrates brainstem and cerebellar abnormalities in congenital central hypoventilation syndrome.. Pediatric research, 2008.
91. Cross RL, Kumar R, Macey PM, Doering LV, Alger JR, Yan-Go FL, Harper RM. Neural alterations and depressive symptoms in obstructive sleep apnea patients.. Sleep, 2008.
92. Macey PM, Kumar R, Woo MA, Valladares EM, Yan-Go FL, Harper RM. Brain structural changes in obstructive sleep apnea.. Sleep, 2008.
93. Kumar R, Gupta RK, Elderkin-Thompson V, Huda A, Sayre J, Kirsch C, Guze B, Han S, Thomas MA. Voxel-based diffusion tensor magnetic resonance imaging evaluation of low-grade hepatic encephalopathy.. Journal of magnetic resonance imaging : JMRI, 2008.
94. Kumar R, Birrer BV, Macey PM, Woo MA, Gupta RK, Yan-Go FL, Harper RM. Reduced mammillary body volume in patients with obstructive sleep apnea.. Neuroscience letters, 2008.
95. Serber SL, Kumar R, Woo MA, Macey PM, Fonarow GC, Harper RM. Cognitive test performance and brain pathology.. Nursing research, 2008.
96. Woo MA, Macey PM, Keens PT, Kumar R, Fonarow GC, Hamilton MA, Harper RM. Aberrant central nervous system responses to the Valsalva maneuver in heart failure.. Congestive heart failure (Greenwich, Conn.), 2007.
97. Kumar R, Macey PM, Woo MA, Alger JR, Harper RM. Elevated mean diffusivity in widespread brain regions in congenital central hypoventilation syndrome.. Journal of magnetic resonance imaging : JMRI, 2006.
98. Woo MA, Macey PM, Keens PT, Kumar R, Fonarow GC, Hamilton MA, Harper RM. Functional abnormalities in brain areas that mediate autonomic nervous system control in advanced heart failure.. Journal of cardiac failure, 2005.
99. Kumar R, Macey PM, Woo MA, Alger JR, Keens TG, Harper RM. Neuroanatomic deficits in congenital central hypoventilation syndrome.. The Journal of comparative neurology, 2005.
100. Macey PM, Macey KE, Kumar R, Harper RM. A method for removal of global effects from fMRI time series.. NeuroImage, 2004.
101. Macey PM, Alger JR, Kumar R, Macey KE, Woo MA, Harper RM. Global BOLD MRI changes to ventilatory challenges in congenital central hypoventilation syndrome.. Respiratory physiology & neurobiology, 2003.