Research Topics
| S A CounterSummaryAffiliation: Harvard University Country: USA Publications
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Publications
Association of hemoglobin levels and brainstem auditory evoked responses in lead-exposed childrenS Allen Counter
Department of Neurology, Harvard Medical School The Biological Laboratories, Cambridge, MA 02138, USA
Clin Biochem 45:1197-201. 2012..Lead (Pb) exposure has also been associated with anemia and aberrant BAER. This study investigated the relationship between HbB level and BAER wave latency and amplitude in Pb-exposed Andean children...
Neurocognitive impairment in lead-exposed children of Andean lead-glazing workersS Allen Counter
Department of Neurology, Harvard Medical School The Biological Laboratories, 16 Divinity Avenue, Cambridge, MA 02138, USA
J Occup Environ Med 47:306-12. 2005..The objective of this study was to assess the effects of PbB concentration on nonverbal intelligence in Andean children with chronic environmental Pb exposure using a nonlanguage-based test of cognitive functioning...- Mercury levels in urine and hair of children in an Andean gold-mining settlementS Allen Counter
Department of Neurology, Harvard Medical School, The Biological Laboratories, Harvard University, Cambridge, Massachusetts 02138, USA
Int J Occup Environ Health 11:132-7. 2005..The wide range of Hg levels in the urine and hair of Andean children of gold miners may place them at risk for neurodevelopmental and learning disorders... - Neurocognitive screening of mercury-exposed children of Andean gold minersS Allen Counter
Department of Neurology, Harvard Medical School, The Biological Laboratories, 16 Divinity Avenue, Cambridge, MA 02138, USA
Int J Occup Environ Health 12:209-14. 2006..16; p = < 0.034). These results suggest that a substantial number of Hg-exposed children in the Nambija study area have neurocognitive deficits in visual-spatial reasoning... - Lead concentrations in maternal blood and breast milk and pediatric blood of Andean villagers: 2006 follow-up investigationS Allen Counter
Department of Neurology Dr Counter, Harvard Medical School The Biological Laboratories, Cambridge, MA 02138, USA
J Occup Environ Med 49:302-9. 2007..To determine the current lead (Pb) concentration in blood (PbB) and breast milk (PbM) of mothers and the PbB of children living in Andean Ecuadorian villages with high Pb contamination... - Brainstem mediation of the stapedius muscle reflex in hydranencephalyS Allen Counter
Neurology Department, Harvard Medical School, Massachusetts General Hospital, Harvard Biological Laboratories, Cambridge, MA 02138, USA
Acta Otolaryngol 127:498-504. 2007.... - Comparative analysis of zinc protoporphyrin and blood lead levels in lead-exposed Andean childrenS Allen Counter
Department of Neurology, Harvard Medical School The Biological Laboratories, Cambridge, MA 02138, USA
Clin Biochem 40:787-92. 2007..The objective of this study was to investigate the zinc protoporphyrin/heme ratio (ZPP/heme) as a biomarker for chronic lead (Pb) poisoning in children with a history of high Pb exposure... - Preservation of brainstem neurophysiological function in hydranencephalyS A Counter
Neurology Department, Harvard Medical School, Massachusetts General Hospital, Harvard Biological Laboratories, Cambridge, MA 02138, United States
J Neurol Sci 263:198-207. 2007.... - Zinc protoporphyrin levels, blood lead levels and neurocognitive deficits in Andean children with chronic lead exposureS Allen Counter
Department of Neurology, Harvard Medical School The Biological Laboratories, Cambridge, MA 02138, USA
Clin Biochem 41:41-7. 2008..To investigate the relationship between blood lead (PbB), zinc protoporphyrin (ZPP) levels and performance on a test of auditory memory in Andean children and adolescents with chronic lead (Pb) exposure... 
Neurocognitive screening of lead-exposed andean adolescents and young adultsS Allen Counter
Department of Neurology, Harvard Medical School The Biological Laboratories, Cambridge, Massachusetts, USA
J Toxicol Environ Health A 72:625-32. 2009..In conclusion, both the RCPM and Digit Span tests were found to be effective instruments for field screening of visual-spatial reasoning and auditory memory abilities, respectively, in Pb-exposed Andean adolescents and young adults...- Neurophysiologic and neurocognitive case profiles of Andean patients with chronic environmental lead poisoningS Allen Counter
Department of Neurology, Harvard Medical School The Biological Laboratories, Cambridge, Massachusetts, USA
J Toxicol Environ Health A 72:1150-9. 2009.... - Assessment of auditory brainstem function in lead-exposed children using stapedius muscle reflexesS A Counter
Department of Neurology, Harvard Medical School The Biological Laboratories, Cambridge, MA 02138, USA
J Neurol Sci 306:29-37. 2011.... - Acoustic stapedius muscle reflex in mercury-exposed Andean children and adultsS Allen Counter
Department of Neurology, Harvard Medical School Harvard Biological Laboratories, Cambridge, MA 02138, USA
Acta Otolaryngol 132:51-63. 2012..The results suggested mercury (Hg)-induced anomalies in the brainstem-mediated acoustic stapedius muscle reflex in children... - Current pediatric and maternal lead levels in blood and breast milk in Andean inhabitants of a lead-glazing enclaveS Allen Counter
Department of Neurology, Harvard Medical School, Cambridge, MA 02138, USA
J Occup Environ Med 46:967-73. 2004..9-33.5 microg/dL for infants. The results showed significantly reduced PbB levels in children in the study area and suggest that a Pb education and prevention program contributed to the current reduction in Pb intoxication... - Neurocognitive effects of chronic lead intoxication in Andean childrenS A Counter
Department of Neurology Biological Laboratories, Harvard University, Cambridge, MA 02138, USA
J Neurol Sci 160:47-53. 1998..The results demonstrate a range of neurological responses in children with chronically elevated PbB levels from apparent exceptional neuro-physiological tolerance of PbB intoxication, to some fine motor and cognitive deficits... - Mercury exposure in children: a reviewS Allen Counter
Department of Neurology, Massachusetts General Hospital, Harvard Biological Laboratories, Harvard Medical School, Cambridge, MA 02138, USA
Toxicol Appl Pharmacol 198:209-30. 2004..Each source of Hg exposure is reviewed in relation to specific pediatric health effects, particularly subtle neurodevelopmental disorders... - Blood lead and hemoglobin levels in Andean children with chronic lead intoxicationS A Counter
Department of Neurology Biological Laboratories, Harvard University, Cambridge, MA 02138, USA
Neurotoxicology 21:301-8. 2000..In conclusion, the results of this investigation indicate that the children in this Pb-contaminated, high altitude study area had chronic elevated PbB levels, which increased with age for males, and probable Pb-induced anemia... - Environmental lead contamination and pediatric lead intoxication in an Andean Ecuadorian villageS A Counter
Harvard University, The Biological Laboratories, 16 Divinity Avenue, Cambridge, MA 02138, USA
Int J Occup Environ Health 6:169-76. 2000..0001). The Pb levels in milk from breastfeeding mothers ranged from 1.44 to 39 ng/g. Lead isotope ratios of the children's blood and of samples of village soil revealed a common Pb source or "fingerprint.".. - Analysis of magnetic resonance imaging acoustic noise generated by a 4.7 T experimental systemS A Counter
Department of Neurology, Harvard University Biological Laboratories, Cambridge, Massachusetts 01238, USA
Acta Otolaryngol 120:739-43. 2000..The intense MRI acoustic impulse noise generated by the 4.7 T system may cause masking of stimuli used in fMRI of the auditory cortex, reduce the hearing acuity of experimental animals and present a risk for unprotected human ears... - Gender differences in blood lead and hemoglobin levels in Andean adults with chronic lead exposureS A Counter
Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Cambridge 02138, USA
Int J Occup Environ Health 7:113-8. 2001..7 microg/dL) in the reference group was significant (t-test, p = 0.026; Mann-Whitney U, p = 0.019). The mean altitude-corrected hemoglobin levels in the study group were lower than normal, 11.3 g/dL for men and 10.9 g/dL for women... - Neuro-ototoxicity in andean adults with chronic lead and noise exposureS Allen Counter
Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Biological Laboratories, 16 Divinity Avenue, Cambridge, MA 02138, USA
J Occup Environ Med 44:30-8. 2002..The results suggest that environmental noise exposure must be considered an important factor in determining sensory-neural hearing status in occupationally Pb-exposed adults... - Elevated blood mercury and neuro-otological observations in children of the Ecuadorian gold minesS Allen Counter
Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Cambridge, USA
J Toxicol Environ Health A 65:149-63. 2002..The children of Portovelo who reported neuro-otological symptoms but had low B-Hg levels (<10 microg/L) may be affected by exposure to sodium cyanide, which is used extensively in the local gold-mining operations... - Brainstem neural conduction biomarkers in lead-exposed children of Andean lead-glaze workersS Allen Counter
Department of Neurology, Harvard Medical School, Cambridge, Massachusetts 02138, USA
J Occup Environ Med 44:855-64. 2002..The findings also demonstrate the variability in the threshold level and duration of Pb exposure necessary to induce brainstem neuropathology... - Neurophysiological anomalies in brainstem responses of mercury-exposed children of Andean gold minersS Allen Counter
Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Harvard Biological Laboratories, Cambridge, Massachusetts 02138, USA
J Occup Environ Med 45:87-95. 2003.... - Succimer (meso-2,3-dimercaptosuccinic acid (DMSA)) treatment of Andean children with environmental lead exposureS Allen Counter
Department of Neurology, Harvard Medical School, Biological Laboratories, Harvard University, 16 Divinity Avenue, Cambridge, Massachusetts 02138, USA
Int J Occup Environ Health 9:164-8. 2003.... - 3D MRI of the in vivo vestibulo-cochlea labyrinth during Gd-DTPA-BMA uptakeS Allen Counter
Neurology Department, Harvard Medical School, Massachusetts General Hospital, Harvard University Biological Laboratories, 16 Divinity Avenue, Cambridge, MA 02138, USA
Neuroreport 14:1707-12. 2003..The findings demonstrate that Gd-enhanced 3D MRI of the perilymphatic space may be used to examine the morphology, kinetics and intravenous substance delivery in the in vivo mammalian vestibulo-cochlea labyrinth... - In vivo observation of dynamic perilymph formation using 4.7 T MRI with gadolinium as a tracerJing Zou
Department of Otolaryngology, Tampere University Hospital, Tampere, Finland
Acta Otolaryngol 123:910-5. 2003..To investigate the pharmacokinetics of gadolinium in the perilymphatic fluid spaces of the cochlea in vivo using high-resolution MRI to obtain information concerning perilymph formation... - Imaging of the guinea pig cochlea following round window gadolinium applicationMaoli Duan
Center for Hearing and Communication Research, Department of Otolaryngology, Karolinska Institutet, 171 76 Stockholm, Sweden
Neuroreport 15:1927-30. 2004..Auditory brainstem response measurements performed on a separate group of animals showed no significant threshold shifts after the application, indicating that gadolinium is non-toxic to the guinea pig cochlea... - Dose and time-dependent protection of the antioxidant N-L-acetylcysteine against impulse noise traumaMaoli Duan
Center for Hearing and Communication Research, Building M1, Karolinska Hospital, SE 171 76 Stockholm, Sweden
Hear Res 192:1-9. 2004..Hair cell loss was significantly reduced using a schedule of three NAC injections in the rats. These results suggest that NAC can partially protect the cochlea against impulse noise trauma...