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Abstract
Neuropsychiatric symptoms are common in systemic lupus erythematosus (SLE) but are poorly understood.Although there is a wide spectrum of clinical manifestations, brain histologyoften simply shows a bland vasculopathy. Magnetic resonance techniques such as magnetic resonance spectroscopy, magnetization transfer imaging and diffusion weighted imaging have been used to try to improve our understandingof the pathophysiologicalmechanisms involved in neuropsychiatric lupus (NPSLE). This article reviews the current literature on the use of these techniques and their possible future role as diagnostic tools in NPSLE.
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Affiliation(s)
- P L Peterson
- Lupus Research Unit, St Thomas' Hospital, London, UK.
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2
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Xiong Y, Lin H, Chen BD, Peterson PL, Lee CP. Appearance of shortened Bcl-2 and Bax proteins and lack of evidence for apoptosis in rat forebrain after severe experimental traumatic brain injury. Biochem Biophys Res Commun 2001; 286:401-5. [PMID: 11500052 DOI: 10.1006/bbrc.2001.5396] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
To investigate whether apoptosis plays a role in traumatic brain injury (TBI), we examined the expression of Bcl-2 and Bax proteins and the release of mitochondrial cytochrome c in rat brains using Western blot analysis. Bcl-2 at the predicted 26 kDa was not detected in controls and TBI groups. However, at 1 h post-TBI, a shortened Bcl-2 protein with a molecular size of approximately 14.5 kDa was detected in the injured hemisphere (R). At 4 and 12 h post TBI, an additional bcl-2 band ( approximately 10 kDa) was detected in R. Both bands disappeared at 14 days post-injury. The predicted 21-kDa band of Bax was detected in both controls and TBI animals. In addition, two shortened Bax proteins ( approximately 18 kDa) were detected after TBI. The time course of appearance was similar to that of Bcl-2 described above. In the present study, neither cytochrome c release from mitochondria nor DNA fragmentation was detected in the forebrains of sham and TBI groups. Treatment of animals with an antioxidant N-acetylcysteine administered ip greatly diminished the levels of shortened Bcl-2 and Bax proteins. These findings suggest that the induction of shortened Bcl-2 and Bax proteins in rat brains may be associated with reactive oxygen species generated after TBI.
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Affiliation(s)
- Y Xiong
- Department of Biochemistry and Molecular Biology, Wayne State University School of Medicine, Detroit, Michigan 48201, USA.
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3
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Abstract
Energy metabolism of the brain is unique, possessing high aerobic metabolism with no significant capacity for anaerobic glycolysis and limited tissue stores of glucose. A steady supply of oxygen and glucose is essential in order to maintain cerebral function and integrity. Extensive research in experimental and human head injury has been conducted regarding the delivery of oxygen and outcome. This research has provided evidence which indicates that in addition to the availability of oxygen and glucose, other factors, such as perturbation of mitochondrial energy transducing processes which also follow head trauma, play significant roles. In this paper, the salient findings from biochemical studies of experimental and clinical brain injury are summarized and indicate that the mitochondrial respiratory chain-linked oxidative phosphorylation and calcium transport are compromised by trauma-induced brain injury and support the idea that oxidative stress and perturbation of cellular calcium homeostasis play significant roles in traumatic brain injury.
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Affiliation(s)
- Y Xiong
- Department of Biochemistry and Molecular Biology, School of Medicine, Wayne State University, 540 East Canfield Street, Detroit, MI 48201, USA
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4
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Verweij BH, Muizelaar JP, Vinas FC, Peterson PL, Xiong Y, Lee CP. Improvement in mitochondrial dysfunction as a new surrogate efficiency measure for preclinical trials: dose-response and time-window profiles for administration of the calcium channel blocker Ziconotide in experimental brain injury. J Neurosurg 2000; 93:829-34. [PMID: 11059665 DOI: 10.3171/jns.2000.93.5.0829] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECT Determining the efficacy of a drug used in experimental traumatic brain injury (TBI) requires the use of one or more outcome measures such as decreased mortality or fewer neurological and neuropsychological deficits. Unfortunately, outcomes in these test batteries have a fairly large variability, requiring relatively large sample sizes, and administration of the tests themselves is also very time consuming. The authors previously demonstrated that experimental TBI and human TBI induce mitochondrial dysfunction. Because mitochondrial dysfunction is easy to assess compared with neurobehavioral endpoints, it might prove useful as an outcome measure to establish therapeutic time windows and dose-response curves in preclinical drug testing. This idea was tested in a model of TBI in rats. METHODS Animals treated with the selective N-type voltage-sensitive calcium channel blocker Ziconotide (also known as SNX-111 and CI-1009) after cortical impact displayed significant improvement in brain mitochondrial function. When a single intravenous bolus injection of 4 mg/kg Ziconotide was given at different time intervals, ranging from 15 minutes before injury to 10 hours after injury, mitochondrial function was improved at all time points, but more so between 2 and 6 hours postinjury. The authors evaluated the effects on mitochondrial function of Ziconotide at different doses by administering 0.5 to 6 mg/kg as a single bolus injection 4 hours after injury, and found 4 mg/kg to be the optimum dose. CONCLUSIONS The authors established these time-window profiles and dose-response curves on the basis of mitochondrial outcome measures in a total of 42 rats because there were such low standard deviations in these tests. Establishing similar time-window profiles and dose-response curves by using neurobehavioral endpoints would have required using 114 rats in much more elaborate experiments.
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Affiliation(s)
- B H Verweij
- Department of Neurosurgery, University of California at Davis Medical Center, Sacramento 95817, USA
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5
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Abstract
OBJECT Oxygen supply to the brain is often insufficient after traumatic brain injury (TBI), and this results in decreased energy production (adenosine triphosphate [ATP]) with consequent neuronal cell death. It is obviously important to restore oxygen delivery after TBI; however, increasing oxygen delivery alone may not improve ATP production if the patient's mitochondria (the source of ATP) are impaired. Traumatic brain injury has been shown to impair mitochondrial function in animals; however, no human studies have been previously reported. METHODS Using tissue fractionation procedures, living mitochondria derived from therapeutically removed brain tissue were analyzed in 16 patients with head injury (Glasgow Coma Scale Scores 3-14) and two patients without head injury. Results revealed that in head-injured patients mitochondrial function was impaired, with subsequent decreased ATP production. CONCLUSIONS Decreased oxygen metabolism due to mitochondrial dysfunction must be taken into account when clinically defining ischemia and interpreting oxygen measurements such as jugular venous oxygen saturation, arteriovenous difference in oxygen content, direct tissue oxygen tension, and cerebral blood oxygen content determined using near-infrared spectroscopy. Restoring mitochondrial function might be as important as maintaining oxygen delivery.
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Affiliation(s)
- B H Verweij
- Department of Neurosurgery, University of California at Davis Medical Center, Sacramento 95817, USA
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6
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Rajpal RC, Weisskopf MG, Rumm PD, Peterson PL, Jentzen JM, Blair K, Foldy S. Wisconsin, July 1999 heat wave: an epidemiologic assessment. WMJ 2000; 99:41-4. [PMID: 11043069] [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] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
OBJECTIVE To assess the characteristics of heat-related deaths in Wisconsin during the summer of 1999. METHODS Review of death certificates indicating heat as an underlying or contributing cause of death. RESULTS Heat-related illness led to 21 deaths during the summer of 1999 in Wisconsin. The rate of death was highest in the elderly, particularly those aged 65-84 years (2.2/100,000). Heat was the underlying cause for 12 of the 21 deaths. Cardiovascular conditions were the underlying cause in 8 of the deaths, and a contributing cause for another 7. CONCLUSIONS The elderly, persons taking psychotropic medications, and persons with chronic diseases, particularly cardiovascular conditions, are at increased risk of death from heat during heat waves. Prevention messages and weather advisories during heat emergencies must target these groups. Care givers and medical personnel must be on heightened awareness for the signs and symptoms of heat exhaustion and heat stroke during these periods.
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Affiliation(s)
- R C Rajpal
- Bureau of Chronic Disease, Division of Public Health, Wisconsin Department of Health and Family Services (DHFS), USA
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7
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Abstract
Efficacy of N-acetylcysteine (NAC) in traumatic brain injury (TBI)-induced mitochondrial dysfunction was evaluated following controlled cortical impact injury in rats. Respiratory function and calcium transport of rat forebrain mitochondria from injured and uninjured hemispheres were examined. NAC significantly restored mitochondrial electron transfer, energy coupling capacity, calcium uptake activity and reduced calcium content absorbed to brain mitochondrial membranes when examined 12 h post-TBI if NAC was administered i.p. 5 min before injury or 30 min or 1 h postinjury. Glutathione (reduced form, GSH) levels in brain tissues were decreased at all time points examined over a 14-day observation period, while mitochondrial GSH levels significantly decreased only at 3 days and 14 days following TBI. NAC treatment given within 1 h greatly restored brain GSH levels from 1 h to 14 days and mitochondrial GSH levels from 12 h to 14 days post-TBI. NAC did not show protective effects when given 2 h postinjury. Our data indicate that NAC administered postinjury at an early stage can effectively restore TBI-induced mitochondrial dysfunction and the protective effect of NAC may be related to its restoration of GSH levels in the brain.
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Affiliation(s)
- Y Xiong
- Department of Biochemistry, School of Medicine, Wayne State University, Detroit, Michigan 48201, USA
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8
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Xiong Y, Peterson PL, Verweij BH, Vinas FC, Muizelaar JP, Lee CP. Mitochondrial dysfunction after experimental traumatic brain injury: combined efficacy of SNX-111 and U-101033E. J Neurotrauma 1998; 15:531-44. [PMID: 9674556 DOI: 10.1089/neu.1998.15.531] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
We recently demonstrated that posttraumatic administration of the N-type calcium channel blocker SNX-111 (S) and a novel blood-brain barrier penetrating antioxidant U-101033E (U), significantly alleviated mitochondrial dysfunction induced by traumatic brain injury (TBI) in rats. The present study was designed to determine whether a combination of S and U, which act on different biochemical mechanisms of secondary brain injury, would be more efficacious than either drug alone. Brain mitochondria from injured and uninjured hemispheres were isolated and examined at 12 h post TBI induced by a severe controlled cortical impact injury. S at 1.0 mg/kg significantly increased both State 3 and 4 rates and produced a slight increase in P/O ratio, and there was virtually no change in RCI. U at 1.0 mg/kg did not show any protection. However, the combined treatment of S at 1.0 mg/kg and U at 1.0 mg/kg eliminated the uncoupling effect of S, and restored not only State 3 rates and P/O ratios but also RCI to near sham values. These results provide further evidence that both reactive oxygen species and perturbation of cellular calcium homeostasis participate in the pathogenesis of TBI-induced mitochondrial dysfunction, and support the idea of using combined therapy with lower drug doses.
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Affiliation(s)
- Y Xiong
- Department of Biochemistry and Molecular Biology, Wayne State University School of Medicine, Detroit, Michigan 48201, USA
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9
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Abstract
The advancement of acute care for persons with brain injury is predicated on the further clarification of the mechanical and biochemical processes that are begun at the time of the injury. Attempts to enhance survival and functional outcome have led to cerebral perfusion and intracranial pressure management techniques. In addition, novel neuroprotective pharmacotherapeutic strategies have been borne from an ever growing knowledge of the degradative biochemical injury that occurs subsequent to the initial insult. The link between the acute and rehabilitation phases of care continues to grow closer, thus compelling the rehabilitationist to be aware of the potential effect these processes and treatments have on outcome.
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Affiliation(s)
- R Zafonte
- Rehabilitation Institute of Michigan, Wayne State University, Detroit, Michigan, USA.
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10
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Xiong Y, Peterson PL, Muizelaar JP, Lee CP. Amelioration of mitochondrial function by a novel antioxidant U-101033E following traumatic brain injury in rats. J Neurotrauma 1997; 14:907-17. [PMID: 9475372 DOI: 10.1089/neu.1997.14.907] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
In the present study, a severe traumatic brain injury (TBI) was produced over the right parietal cortex of rats using the controlled cortical impact injury (CCII) model. TBI perturbed calcium homeostasis and impaired electron transfer and energy coupling activities of forebrain mitochondria isolated from injured hemispheres with a maximal injury at 12-72 h. Efficacy of the blood-brain barrier penetrating antioxidant U-101033E on TBI-induced mitochondrial impairment was evaluated. In the dose-response experiment, two i.v. boluses (vehicle or 1-10 mg/kg of U-101033E) were administered at 5 min and 2h post-TBI. Forebrain mitochondria from each hemisphere were examined at 12 h post-injury. With respect to forebrain mitochondrial dysfunction, the drug showed a bell-shaped dose-response curve with an optimal dose of 3 mg/kg (n = 5, p < 0.05 vs. vehicle). In the time-course experiment, two i.v. boluses of 3 mg U-101033E/kg (the optimal dose) were given at 5 min and 2 h post-injury and forebrain mitochondria were examined at 6 h-14 days post-injury. U-101033E significantly restored electron transfer, energy coupling capacity, and Ca2+ transport capacity during 6 h to 14 days post-injury. Our data indicate that the antioxidant U-101033E administered post-injury at proper dosage can effectively restore TBI-induced mitochondrial dysfunction and support the contention that oxidative stress plays an important role in the pathogenesis of TBI.
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Affiliation(s)
- Y Xiong
- Department of Biochemistry and Molecular Biology, School of Medicine, Wayne State University, Detroit, MI 48201, USA
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11
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Verweij BH, Muizelaar JP, Vinas FC, Peterson PL, Xiong Y, Lee CP. Mitochondrial dysfunction after experimental and human brain injury and its possible reversal with a selective N-type calcium channel antagonist (SNX-111). Neurol Res 1997; 19:334-9. [PMID: 9192388 DOI: 10.1080/01616412.1997.11740821] [Citation(s) in RCA: 126] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
We have recently demonstrated in a rat model that traumatic brain injury induces perturbation of cellular calcium homeostasis with an overload of cytosolic calcium and excessive calcium adsorbed on the mitochondrial membrane, consequently the mitochondrial respiratory chain-linked oxidative phosphorylation was impaired. We report the effect of a selective N-type calcium channel blocker, SNX-111 on mitochondrial dysfunction induced by a controlled cortical impact. Intravenous administration of SNX-111 at varying times post injury was made. The concentration titration profile revealed SNX-111 at 4 mg kg-1 to be optimal, and the time window to be administration at 4 h post-injury, in line with that reported on the effect of SNX-111 in experimental stroke. Under optimal conditions, SNX-111 significantly improved the mitochondrial respiratory chain-linked functions, such as the electron transfer activities with both succinate and NAD-linked substrates, and the accompanied energy coupling capacities measured as respiratory control indices (RCI) and ATP synthesis (P/O ratio), and the energy linked Ca2+ transport. In order to assess the applicability of these data to the clinical setting, we have initiated studies with brain tissue which has to be resected during surgical treatment. Five patients suffered from brain trauma, one from intracranial hypertension due to stroke (noninfarcted tissue was taken), and one from epilepsy. Our data revealed that brain mitochondria derived from the patient with intracranial hypertension and the patient with epilepsy were tightly coupled with good respiratory rates with glutamate and malate as substrates, and high P/O ratios. The rates of respiration and ATP synthesis were severely impaired in the brain mitochondria isolated from traumatized patients. These results indicate that investigation of brain mitochondrial functions can be used as a measure for trauma-induced impairment of brain energy metabolism. The time window for the effect of SNX-111 in mitochondrial function and the (preliminary) similarity between mitochondrial dysfunction in experimental animals and humans make the drug appear to be well suited for clinical trials in severe head injury.
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Affiliation(s)
- B H Verweij
- Department of Neurosurgery, School of Medicine, Wayne State University, Detroit, MI, USA
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12
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Abstract
Traumatic brain injury (TBI) is associated with primary and secondary injury. A thorough understanding of secondary injury will help to develop effective treatments and improve patient outcome. In this study, the GM model of controlled cortical impact injury (CCII) of Lighthall (1988) was used with modification to induce lateral TBI in rats. Forebrain mitochondria isolated from ipsilateral (IH) and contralateral (CH) hemispheres to impact showed a distinct difference. With glutamate + malate as substrates, mitochondria from the IH showed a significant decrease in State 3 respiratory rates, respiratory control indices (RCI), and P/O ratios. This decrease occurred as early as 1 h and persisted for at least 14 days following TBI. The State 3 respiratory rates, RCI, and P/O ratios could be restored to sham values by the addition of EGTA to the assay mixture. A significant amount of Ca2+ was found to be adsorbed to the mitochondria of both the IH and the CH with higher values seen in the IH. The rate of energy-linked Ca2+ transport in the IH was significantly decreased at 6 and 12 h. These data indicate that CCII-induced TBI perturbs cellular Ca2+ homeostasis and results in excessive Ca2+ adsorption to the mitochondrial membrane, which subsequently inhibits the respiratory chain-linked electron transfer and energy transduction.
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Affiliation(s)
- Y Xiong
- Department of Biochemistry, School of Medicine, Wayne State University, Detroit, Michigan 48201, USA
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13
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Nashold RD, Jentzen JM, Peterson PL, Remington PL. Heat-related deaths during the summer of 1995, Wisconsin. Wis Med J 1996; 95:382-3. [PMID: 8693759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- R D Nashold
- Department of Health and Social Services (DHSS), Center for Health Statistics, WI, USA
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14
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Abstract
This paper briefly summarizes the results of a long-term, open pharmacotherapy trial in 16 patients with well-characterized mitochondrial disease. Outcome measures included repeated clinical evaluation, 31P-NMR spectroscopy and near-infrared spectroscopy. Treated patients appeared to survive longer with less functional disability and medical complications than typically seen in clinical practice.
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Affiliation(s)
- P L Peterson
- Department of Neurology, Wayne State University School of Medicine, Detroit, MI 48201, USA
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15
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Reynolds KD, Coombs DW, Lowe JB, Peterson PL, Gayoso E. Evaluation of a self-help program to reduce alcohol consumption among pregnant women. Int J Addict 1995; 30:427-43. [PMID: 7607777 DOI: 10.3109/10826089509048735] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
This study tested a cognitive-behavioral intervention for reducing alcohol consumption among economically disadvantaged pregnant women. The intervention included a 10-minute educational session and a nine-step self-help manual. Women attending public health maternity clinics completed a screening questionnaire, a pretest questionnaire, were randomly assigned to receive the self-help intervention or usual clinic care, and completed a posttest questionnaire. A higher alcohol quit rate was observed among the intervention participants (88%) than controls (69%). The effect was strongest for "light" drinkers, African-Americans, and non-Protestants. This approach may be useful in clinics where staff time is limited.
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Affiliation(s)
- K D Reynolds
- Department of Health Behavior, University of Alabama at Birmingham 35294, USA
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16
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Alcantara AL, Roszler MH, Guyot AM, Peterson PL. Blunt head trauma: comparison of various weapons with intracranial injury and neurologic outcome. J Trauma 1994; 37:521-4. [PMID: 7932879] [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] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The weapons used in blunt head trauma cases were identified to determine if a particular weapon was associated with a specific type of intracranial injury or a poorer neurologic outcome. A consecutive sample of 178 patients was examined. Forty-seven percent of patients beaten with baseball bats and 63% of patients beaten with fists had positive computed tomographic (CT) findings. Twenty five percent of patients beaten with bats and 48% of those beaten with fists had poor neurologic outcomes (p < 0.056). Of those with positive CT findings, 30% of patients beaten with bats and 59% of patients beaten with fists had a poor outcome (p = 0.511). No weapon was associated with a particular intracranial injury. Of assault victims who survive an attack and require admission to the hospital, those beaten with bats are less likely to have significant neurologic dysfunction upon hospital discharge than those beaten with fists.
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Affiliation(s)
- A L Alcantara
- Department of Radiology, Detroit Receiving Hospital, Wayne State University School of Medicine, MI 48201
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17
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Wells EA, Peterson PL, Gainey RR, Hawkins JD, Catalano RF. Outpatient treatment for cocaine abuse: a controlled comparison of relapse prevention and twelve-step approaches. Am J Drug Alcohol Abuse 1994; 20:1-17. [PMID: 8192128 DOI: 10.3109/00952999409084053] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
This study sought to assess the efficacy of treatment for cocaine abuse and to compare the relative effectiveness of a cognitive-behavioral relapse prevention treatment with that of a Twelve-Step recovery support group in an outpatient group treatment setting. One hundred ten subjects seeking treatment were alternately assigned to relapse prevention or Twelve-Step treatment. Self-report data were collected at baseline, posttreatment, and 6-month follow-up. There were no differential effects of treatment type on cocaine or marijuana use over time. However, subjects in both treatment conditions reduced cocaine and marijuana use at posttreatment. Subjects in both groups reduced their alcohol use from pretreatment to posttreatment. Subjects receiving Twelve-Step treatment showed greater increases from posttreatment to 6-month follow-up in alcohol use than did relapse prevention participants. Treatment attendance was negatively related to cocaine use at posttreatment and cocaine and marijuana use at 6-month follow-up. Difficulties in conducting cocaine treatment outcome research are discussed as are treatment and research implications of the findings.
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Affiliation(s)
- E A Wells
- Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle 98195
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18
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Alich AA, Wittmers LE, Anderson LA, Rieschl EM, Peterson PL. Gastric mucosal damage due to aspirin and copper aspirinate assessed by gastric mucosal potential difference changes. J Pharmacol Toxicol Methods 1992; 27:245-50. [PMID: 1421534 DOI: 10.1016/1056-8719(92)90047-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
When the gastric mucosa is damaged by antiinflammatory agents, such as aspirin, gastric mucosal potential difference (GPD) decreases and may or may not return to predamage values after the agent is removed. The magnitude and time course of the gastric potential difference changes have been suggested as a measure of mucosal damage. Male Sprague-Dawley rats were fasted, anesthetized, and surgically prepared for measurement of GPD by placement of electrodes in the gastric lumen and spleen. Test mixtures of aspirin, copper aspirinate, copper sulfate, or mixtures of aspirin and copper sulfate were administered by gavage, and subsequent changes in GPD were recorded. The area between the extrapolated control (baseline) GPD and the damage GPD was determined. The product of this area and the maximum change in GPD, the Reizindex (RI), was calculated. Values for all copper (II)-containing systems, including those with no aspirin, were significantly greater than aspirin alone. It was concluded that factors other than mucosal damage may contribute to a reduction in GPD and, therefore, an increase in Reizindex.
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Affiliation(s)
- A A Alich
- Department of Chemistry, College of St. Scholastica, Duluth, Minnesota 55811
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19
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Abstract
Fetal alcohol exposure is a serious social and public health problem. However, most prevention programs in this area are solely informational. Important gaps in both understanding processes which underlie alcohol consumption during pregnancy and in the design of interventions to prevent fetal alcohol exposure are discussed. We argue that an important group missed by current interventions are women for whom abstinence is difficult, but who are not physically addicted. Cognitive behavioral interventions are proposed as appropriate for this target group. Recommendations for future directions in the area of fetal alcohol exposure are discussed.
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20
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Abstract
A systematic study of the effects of the synthetic glucocorticoid, methylprednisolone (MP), on respiration and energy coupling in tightly-coupled mitochondria isolated from rat tissues has been initiated. In intact rat skeletal muscle, liver and heart mitochondria, incubation, in vitro, with greater than or equal to 0.1 mM MP caused inhibition of the state 3 respiratory rates with succinate and NAD-linked substrates. In skeletal muscle and heart mitochondria, the oxidation of succinate was significantly more sensitive to MP than was that of the NAD-linked substrates. No effects were seen at low concentrations (less than 0.02 mM) of MP. In all three tissues, these data together with analysis of the partial reactions of the electron transport chain and steady-state kinetic analysis of cytochrome reduction indicated that in isolated mitochondria high concentrations of MP: (a) inhibit the oxidation of NAD-linked substrates at the level of the respiratory chain between the primary NADH dehydrogenase flavoprotein and coenzyme Q, most likely at the iron-sulfur centers or coenzyme Q-binding proteins of complex I; and (b) inhibit succinate oxidation in intact (but not disrupted) mitochondria, not by inhibiting electron transfer along the respiratory chain, but possibly at the level of succinate transport into the mitochondria. The results of these studies suggest that the therapeutic effects of MP in mitochondrial disease result from indirect effects rather than direct effects on the mitochondrial membrane. More importantly, the absence of an effect at low MP concentrations provides the baseline information needed for further studies to be carried out in vivo.
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Affiliation(s)
- M E Martens
- Department of Neurology, Wayne State University School of Medicine, Detroit, MI
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21
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Abstract
A 3-year prospective study of 31,081 admissions to an inner-city, emergency trauma hospital revealed 33 patients less than or equal to 45 years of age who had a total of 35 acute neurovascular events (infarction or hemorrhage) related to cocaine abuse (3% of the total 979 cocaine-related admissions). Fifty-four percent of the events were ischemic, and 46% were hemorrhagic. Six patients died. The majority (63%) of ischemic events were hemispheric and subcortical in distribution. Eleven of 13 angiograms were abnormal (five aneurysms and two arteriovenous malformations were identified). No case of "vasculitis" was seen. Seventy percent of the patients exclusively abused crack cocaine, and 94% of the neurovascular events were related to its use. No first-time cocaine users were identified. During the last year of the study, 29% of the 558 cocaine-related admissions were psychiatric admissions, and most (58%) were for treatment of depressive illness (34 patients were admitted for attempted suicide).
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Affiliation(s)
- P L Peterson
- Department of Neurology, Wayne State University School of Medicine, Detroit, MI
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22
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Hurko O, Johns DR, Rutledge SL, Stine OC, Peterson PL, Miller NR, Martens ME, Drachman DB, Brown RH, Lee CP. Heteroplasmy in chronic external ophthalmoplegia: clinical and molecular observations. Pediatr Res 1990; 28:542-8. [PMID: 2255577 DOI: 10.1203/00006450-199011000-00026] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Chronic progressive external ophthalmoplegia (CPEO) describes a recognizable clinical syndrome frequently associated with variable dysfunction in other organ systems. Histochemical and biochemical studies suggested primary dysfunction of oxidative phosphorylation. This has recently been confirmed by demonstration of partially deleted as well as normal mitochondrial DNA--heteroplasmy--in some of these patients, most of them sporadic. In the six heteroplasmic CPEO patients that we have examined to date, the partially deleted species has been detected in all tissues tested, albeit in vastly different proportions. We report here detection of physiologically significant proportions of partially deleted mitochondrial DNA in several organs taken at autopsy from a CPEO patient with severe multisystem disease. We discuss the relationship of CPEO to several other clinical phenotypes associated with mitochondrial dysfunction, and discuss the possible implications of heteroplasmy for the development of variable phenotypes.
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Affiliation(s)
- O Hurko
- Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
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23
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Abstract
An 18-year-old female had clinical features of idiopathic torsion dystonia with bilateral hypodense putaminal lesions on computed tomography. Mitochondrial encephalomyopathy was suspected because of persistent lactic acidemia and myopathy. Studies of oxidative metabolism on isolated skeletal muscle mitochondria revealed partial cytochrome b deficiency indicating a defect in the cytochrome b- c1 complex. This finding represents a unique, multisystem syndrome of progressive dystonia, putaminal degeneration, myopathy, and mitochondrial cytochrome b deficiency. Mitochondrial metabolic disorders may be a cause of torsion dystonia when other known associated factors are absent.
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Affiliation(s)
- M A Nigro
- Department of Neurology, Wayne State University School of Medicine, Detroit, Michigan
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Peterson PL. Treatment of Friedreich's ataxia with amantadine. Neurology 1989. [DOI: 10.1212/wnl.39.5.749-c] [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: 11/15/2022] Open
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26
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Salmi LR, Weiss HB, Peterson PL, Spengler RF, Sattin RW, Anderson HA. Fatal farm injuries among young children. Pediatrics 1989; 83:267-71. [PMID: 2913557] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Death certificate data concerning farm-related injury deaths among children 0 to 9 years of age in Wisconsin and Illinois for the period of 1979 to 1985 were reviewed. Average annual farm-related injury death rates were 3.2 per 100,000 rural children in Wisconsin (62 deaths) and 1.5 per 100,000 in Illinois (32 deaths). Rates were three times higher among boys than girls. The occurrence of two harvest-related peaks and the absence of fatality in children less than 1 year of age suggest that presence of children on the farm when supervision is diminished is a key factor in farm-related fatalities. Moving machinery (tractors, wagons, and trucks) was the source of injury in approximately 55% of all deaths. Drowning accounted for 15% of all farm-related deaths. Two fatalities related to gravity box wagons could have easily been prevented with simple safety devices. These findings suggest a need for developing environmental interventions in farms. This will require the allocation of more resources to farm safety programs and a revision of current farm safety legislation.
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Affiliation(s)
- L R Salmi
- Division of Injury Epidemiology and Control, Centers for Disease Control, Atlanta, GA 30333
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Abstract
Homosexual men and women have been described as at high risk for alcohol and drug abuse, due to psychosocial variables such as stress levels or the cultural importance of bar settings. However, there are few actual data in this regard. This paper presents the findings of a large (n = 3400) survey of a homosexual population regarding population characteristics and patterns of alcohol and drug use. Psychosocial variables that may account for substance use patterns both generally and in this population are discussed in an accompanying paper. Substantially higher proportions of the homosexual sample used alcohol, marijuana, or cocaine than was the case in the general population. Contrary to other reports, this was not accompanied by higher rates of heavy use, although homosexuals did show higher rates of alcohol problems. In the general population women consume less drugs and alcohol than do men, and substance use substantially declines with age. Neither of these patterns were found for the homosexual sample, thus creating overall higher rates of substance abuse. This may reflect differences between homosexuals and the general population in their adherence to sex-role stereotypes and age-related social role changes, as well as culturally specific stressors and vulnerability to substance use.
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Affiliation(s)
- D J McKirnan
- University of Illinois, Department of Psychology, Chicago 60680
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Abstract
Homosexual men and women may be at risk for alcohol and drug abuse due to psychosocial variables such as drinking styles, stress, or the cultural importance of bars. The study of psychosocial variables in homosexual culture may help us understand how they operate generally. This paper describes the findings of a large (n = 3400) survey of homosexual population. The core hypothesis was that stress and other psychosocial variables have their primary effects among people made vulnerable to substance abuse by individual expectancies and/or cultural values. Tension reduction expectancies of alcohol effects had substantial effects on alcohol and drug abuse, as did the use of bars as a social resource, a vulnerability variable more specific to urban homosexual culture. Further, stress affected alcohol-drug problems only among people who were "vulnerable" via expectancies and values, and both high risk styles of substance use and simple consumption levels had much stronger effects on problems among vulnerable respondents, thus supporting the stress-vulnerability perspective. Individual differences in social role status was related to alcohol and drug problems, and may explain differences between homosexual and general populations.
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Affiliation(s)
- D J McKirnan
- University of Illinois, Department of Psychology, Chicago 60680
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29
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Martens ME, Peterson PL, Lee CP, Nigro MA, Hart Z, Glasberg M, Hatfield JS, Chang CH. Kearns-Sayre syndrome: biochemical studies of mitochondrial metabolism. Ann Neurol 1988; 24:630-7. [PMID: 2849368 DOI: 10.1002/ana.410240507] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Examination of oxidative metabolism in mitochondria isolated from quadriceps skeletal muscle biopsy specimens of 4 patients with Kearns-Sayre syndrome has shown that the mitochondria were tightly coupled, with maximal respiratory rates depending on the presence of adenosine diphosphate (ADP), Ca2+, or uncoupler. The state 3 respiratory rates with nicotinamide adenine dinucleotide (NAD)-linked substrates and succinate were much lower than those of control subjects. The cytochrome oxidase activities (measured with ascorbate + phenazine methosulfate as substrates) were also decreased, but this segment of the respiratory chain was not rate-limiting for succinate or NAD-linked substrate oxidation. Analyses of the steady-state reduction kinetics of the respiratory chain carriers revealed that the rate-limiting step of the impaired respiration with succinate or NAD-linked substrates lies between the c cytochromes and cytochrome oxidase. Measurement of the total substrate-reducible (at anaerobiosis) and chemically reducible levels of the cytochromes in mitochondria from 3 patients showed a severe deficiency of cytochrome a + a3 and an excess of the c cytochromes. To our knowledge, this is the first instance in which a mitochondrial electron transfer defect and cytochrome oxidase deficiency has been shown to be associated with an excess of the c cytochromes.
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Affiliation(s)
- M E Martens
- Department of Neurology, Wayne State University School of Medicine, Detroit, MI 48201
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McKirnan DJ, Peterson PL. Stress, expectancies, and vulnerability to substance abuse: a test of a model among homosexual men. J Abnorm Psychol 1988. [PMID: 3264559 DOI: 10.1037//0021-843x.97.4.461] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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31
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Abstract
Amantadine hydrochloride (AH) was orally administered to 16 patients with Friedreich's ataxia. We evaluated patient response with the functional ataxia scoring scale and calculated a total disability score. The mean percent improvement of the total disability score was 29.5%; for ambulatory patients alone it was 45.5%. No significant side effects were encountered. AH appears to be a safe and effective symptomatic treatment of Friedreich's ataxia.
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Affiliation(s)
- P L Peterson
- Department of Neurology, Wayne State University, Detroit, MI
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32
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Peterson PL, Martens ME, Lee CP. Mitochondrial encephalomyopathies. Neurol Clin 1988; 6:529-44. [PMID: 3065599] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Mitochondrial encephalomyopathies are neurodegenerative disorders characterized by ragged-red myopathy and encephalopathy, which are recognized with increasing frequency. This article presents the clinical features; pertinent historical, biochemical, and genetic aspects; evaluation; and treatment of mitochondrial encephalomyopathies of childhood and the adult years.
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Affiliation(s)
- P L Peterson
- Department of Neurology, Detroit Receiving Hospital, Michigan
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Abstract
A 33-month-old boy with recurrent stroke-like episodes had angiographic features characteristic of moyamoya syndrome. Mitochondrial encephalomyopathy was suspected because of lactic acidosis and ptosis. Studies of oxidative metabolism on isolated skeletal muscle mitochondria revealed impairment of NADH-coenzyme Q reductase activity. Mitochondrial metabolic disorders may cause moyamoya syndrome when other known associated factors are absent.
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Affiliation(s)
- S Kotagal
- Department of Neurology, St. Louis University Medical Center, MO 63110
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McKirnan DJ, Peterson PL. Stress, expectancies, and vulnerability to substance abuse: A test of a model among homosexual men. Journal of Abnormal Psychology 1988; 97:461-6. [PMID: 3264559 DOI: 10.1037/0021-843x.97.4.461] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Affiliation(s)
- L M Maher
- Department of Neurology, Wayne State University School of Medicine, Detroit, MI 48201
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Abstract
Two brothers had nonobstructive hypertrophic cardiomyopathy, mental retardation, and vacuolar myopathy, and their mother died of cardiopathy at age 31. Seven families with this syndrome have been described; heredity appears to be X-linked dominant or autosomal dominant, with different expressivity in males and females. The biochemical cause of this lysosomal storage disease is unknown.
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Fowler JW, Peterson PL. Increasing reading persistence and altering attributional style of learned helpless children. J Educ Psychol 1981; 73:251-60. [PMID: 7229193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Peterson PL. Interactive effects of student anxiety, achievement orientation, and teacher behavior on student achievement and attitude. J Educ Psychol 1977; 69:779-92. [PMID: 591671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Abstract
Circulating gas emboli associated with rapid decompression are detectable in superficial vessels of animals by the use of an ultrasonic Doppler flowmeter transducer which is applied externally.
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Gillis MF, Peterson PL, Karagianes MT. In vivo detection of circulating gas emboli associated with decompression sickness using the Doppler flowmeter. Nature 1968; 217:965-7. [PMID: 5642853 DOI: 10.1038/217965a0] [Citation(s) in RCA: 39] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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