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Amaral L, Ganho-Ávila A, Osório A, Soares MJ, He D, Chen Q, Mahon BZ, Gonçalves OF, Sampaio A, Fang F, Bi Y, Almeida J. Hemispheric asymmetries in subcortical visual and auditory relay structures in congenital deafness. Eur J Neurosci 2016; 44:2334-9. [PMID: 27421820 DOI: 10.1111/ejn.13340] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [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: 06/07/2016] [Revised: 07/05/2016] [Accepted: 07/06/2016] [Indexed: 11/28/2022]
Abstract
Neuroplasticity - the capacity of the brain to change as a response to internal and external pressures - has been studied from a number of different perspectives. Perhaps one of the most powerful models is the study of populations that have been congenitally deprived of a sense. It has been shown that the right Auditory Cortex (AC) of congenitally deaf humans is neuroplastically modified in order to represent visual properties of a stimulus. One unresolved question is how this visual information is routed to the AC of congenitally deaf individuals. Here, we performed volumetric analysis of subcortical auditory and visual brains regions - namely the thalamus (along with three thalamic nuclei: the pulvinar, the lateral geniculate nucleus and the medial geniculate nucleus), and the inferior and superior colliculi - in deaf and hearing participants in order to identify which structures may be responsible for relaying visual information toward the altered AC. Because there is a hemispheric asymmetry in the neuroplastic changes observed in the AC of the congenitally deaf, we reasoned that subcortical structures that also showed a similar asymmetry in their total volume could have been enlisted in the effort of relaying visual information to the neuroplastically altered right AC. We show that for deaf, but not for hearing individuals, the right thalamus, right lateral geniculate nucleus and right inferior colliculus are larger than their left counterparts. These results suggest that these subcortical structures may be responsible for rerouting visual information to the AC in congenital deafness.
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Affiliation(s)
- L Amaral
- Proaction Laboratory, Faculty of Psychology and Education Sciences, University of Coimbra, 3001-802, Coimbra, Portugal.,Faculty of Psychology and Education Sciences, University of Coimbra, Coimbra, Portugal.,CINEICC, Faculty of Psychology and Education Sciences, University of Coimbra, Coimbra, Portugal
| | - A Ganho-Ávila
- Proaction Laboratory, Faculty of Psychology and Education Sciences, University of Coimbra, 3001-802, Coimbra, Portugal.,Faculty of Psychology and Education Sciences, University of Coimbra, Coimbra, Portugal.,Neuropsychophysiology Laboratory, Research Center in Psychology, School of Psychology, University of Minho, Minho, Portugal
| | - A Osório
- Social and Cognitive Neuroscience Laboratory and Developmental Disorders Program, Center for Health and Biological Sciences, Mackenzie Presbyterian University, Sao Paulo, Brazil
| | - M J Soares
- Proaction Laboratory, Faculty of Psychology and Education Sciences, University of Coimbra, 3001-802, Coimbra, Portugal.,Faculty of Psychology and Education Sciences, University of Coimbra, Coimbra, Portugal
| | - D He
- Department of Psychology and Beijing Key Laboratory of Behavior and Mental Health, Peking University, Beijing, China
| | - Q Chen
- Department of Brain and Cognitive Sciences, University of Rochester, Rochester, NY, USA
| | - B Z Mahon
- Department of Brain and Cognitive Sciences, University of Rochester, Rochester, NY, USA.,Center for Visual Science, University of Rochester, Rochester, NY, USA.,Department of Neurosurgery, University of Rochester, Rochester, NY, USA
| | - O F Gonçalves
- Neuropsychophysiology Laboratory, Research Center in Psychology, School of Psychology, University of Minho, Minho, Portugal.,Bouvé College of Health Sciences, Northeastern University, Boston, MA, USA.,Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Harvard Medical School, Boston, MA, USA
| | - A Sampaio
- Neuropsychophysiology Laboratory, Research Center in Psychology, School of Psychology, University of Minho, Minho, Portugal
| | - F Fang
- Department of Psychology and Beijing Key Laboratory of Behavior and Mental Health, Peking University, Beijing, China.,PKU-IDG/McGovern Institute for Brain Research, Peking University, Beijing, China.,Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
| | - Y Bi
- State Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, Beijing, China
| | - J Almeida
- Proaction Laboratory, Faculty of Psychology and Education Sciences, University of Coimbra, 3001-802, Coimbra, Portugal. .,Faculty of Psychology and Education Sciences, University of Coimbra, Coimbra, Portugal. .,CINEICC, Faculty of Psychology and Education Sciences, University of Coimbra, Coimbra, Portugal.
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Mathias W, Arruda A, Santos FC, Arruda AL, Mattos E, Osório A, Campos O, Gil M, Andrade JL, Carvalho AC. Safety of dobutamine-atropine stress echocardiography: A prospective experience of 4,033 consecutive studies. J Am Soc Echocardiogr 1999; 12:785-91. [PMID: 10511646 DOI: 10.1016/s0894-7317(99)70182-3] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Dobutamine-atropine stress echocardiography (DASE) is an established method and has been shown to be accurate for the detection of coronary artery disease. Still, there are few large clinical studies that analyze the safety of DASE in general or the safety of performing it on an ambulatory basis. Most studies use a target heart rate as the primary end point regardless of whether asymptomatic ischemia occurs. Such studies have shown a serious cardiac event rate of approximately 0.3%. We prospectively studied 4,033 consecutive patients on an ambulatory basis and in the hospital with the use of DASE from July 1991 to December 1998. All tests were performed by an experienced physician, and all clinical and DASE data were stored in a large database organized at the beginning of the study. Dobutamine was infused in scalar doses of 5, 10, 20, 30, and 40 microg/kg per minute in 3-minute stages. Development of a new wall motion abnormality, achievement of 85% of target heart, and end of the DASE infusion protocol were used as an end point. If 85% of the target heart rate was not achieved, atropine was infused up to 1 mg in the absence of myocardial ischemia, which was used in 1,280 studies. There were 3,645 diagnostic tests, and 388 (10%) were found to be nondiagnostic. This result was due to poor image quality in 115 (3%), end of protocol in negative-submaximal examinations in 124 (3%), and limiting side effects in 149 (4%). Thirty-seven percent of the tests showed positive results for myocardial ischemia. Major test-related cardiac complications occurred in 10 (0.25%) patients and included 1 ventricular fibrillation, 1 case of myocardial infarction, and 8 cases of sustained ventricular tachycardia. Atropine poisoning was observed in 5 (0.12%) patients. No deaths occurred as a direct or indirect consequence of DASE. We conclude that dobutamine-atropine stress echocardiography is a reasonably safe method for detection of coronary artery disease in the hospital or in an ambulatory basis. The use of new wall motion abnormality as 1 of the end points may prevent further ischemia-related complications.
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Affiliation(s)
- W Mathias
- Echocardiography Laboratories of Paulista School of Medicine (UNIFESP) and Exata Diagnostics, São Paulo, Brazil.
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