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Howard-Jones PA, Rosen S. Uncomodulated glimpsing in "checkerboard" noise. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 1993; 93:2915-22. [PMID: 8315155 DOI: 10.1121/1.405811] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The ability of listeners to "glimpse" acoustic cues during the quieter sections of an interrupted noise has primarily been studied using maskers with interruptions occurring simultaneously across the entire frequency range of the masker--broadband comodulated interruptions. Here, the possibility of uncomodulated glimpsing (the glimpsing of acoustic cues separated both in time and frequency) was investigated. To achieve this, speech reception thresholds for a set of intervocalic consonants were adaptively measured in 100-Hz to 10-kHz pink noise divided into a varying number of frequency bands of equal energy. In uncomodulated noise conditions, the odd and even numbered bands were switched on and off alternately at a rate of 10 Hz. The spectrograms of such noises (on log frequency scales), resemble portions of a checkerboard. Glimpsing in "checkerboard" noise was found with maskers divided into two and four bands, but not into eight bands or more. Further investigations showed that, in the two-band case, this release from masking was indeed due to uncomodulated glimpsing, and not simply attributable to glimpsing in one of the modulated bands. In the four-band case, the release from masking in checkerboard noise can be accounted for without recourse to uncomodulated glimpsing. Interestingly, conditions which allowed glimpsing resulted in greater intersubject variability. The implications of these results for quantitative analyses of masker fluctuations are discussed.
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Burdmann EA, Rosen S, Lindsley J, Elzinga L, Andoh T, Bennett WM. Production of less chronic nephrotoxicity by cyclosporine G than cyclosporine A in a low-salt rat model. Transplantation 1993; 55:963-6. [PMID: 8497907 DOI: 10.1097/00007890-199305000-00001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Chronic tubulointerstitial nephropathy during long-term cyclosporine A (CsA) use has led to a search for equally effective but safer analogues. In this study we evaluated one of these analogues, cyclosporine G (CsG), in a rat model of chronic cyclosporine nephrotoxicity. CsG has immunosuppressive effects equivalent to CsA when dosed on a weight basis. Pair-fed Sprague-Dawley rats kept on a low-salt rice diet were given CsA 15 mg/kg, CsG 15 mg/kg, CsG 25 mg/kg, or vehicle subcutaneously. After 21 days, CsA animals had a lower glomerular filtration rate, measured by inulin clearance (0.16 +/- 0.04 ml/min/100 g) and higher serum creatinine (0.94 +/- 0.06 mg/dl) than CsG 15 mg/kg (GFR: 0.41 +/- 0.10 ml/min/100 g and serum creatinine: 0.68 +/- 0.09 mg/dl), CsG 25 mg/kg (GFR: 0.39 +/- 0.16 ml/min/100 g) or control rats (GFR: 0.62 +/- 0.06 ml/min/100 g; serum creatinine: 0.56 +/- 0.03 mg/dl), respectively (P < 0.05). The CsA group had considerable cortical and medullary injury (interstitial fibrosis and tubular atrophy), whereas both groups of CsG animals had more limited changes. Despite the same or larger doses of CsG on a weight basis, cyclosporine blood levels were significantly lower in CsG than CsA rats. We conclude that CsG, an analogue of cyclosporine with immunosuppressive activity equivalent to that of CsA, produced less nephrotoxicity in a model of chronic renal injury in rats, using both functional and structural parameters.
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Heyman SN, Clark BA, Cantley L, Spokes K, Rosen S, Brezis M, Epstein FH. Effects of ioversol versus iothalamate on endothelin release and radiocontrast nephropathy. Invest Radiol 1993; 28:313-8. [PMID: 8478171 DOI: 10.1097/00004424-199304000-00011] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
RATIONALE AND OBJECTIVES Certain radiocontrast agents, including iothalamate, iohexol, and ioxaglate, release the renal vasoconstrictor peptide endothelin from vascular endothelium in a way that might contribute to radiocontrast nephropathy. The effects of the nonionic, low osmolar agent, ioversol, on endothelin release and renal function are investigated. METHODS Effects of ioversol were compared with equi-iodine doses of iothalamate when applied to cultured bovine aortic endothelial cells or injected into normal rats and rats preconditioned by uninephrectomy, salt depletion, and indomethacin (USIC) to develop radiocontrast nephropathy. RESULTS In comparison with iothalamate, ioversol had a greatly reduced propensity to stimulate the release of endothelin, from cultured cells and when injected into anesthetized rats. Ioversol produced less renal vasoconstriction than did iothalamate, in control and in USIC rats, and the development of radiocontrast nephropathy, assessed by creatinine clearance and morphologic damage to the renal medulla, was largely avoided. CONCLUSIONS These results strengthen the hypothesis that endothelin release induced by radiocontrast agents is correlated with their renal toxicity and therefore, may play a role in radiocontrast nephropathy.
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Rosen S, Collins KJ. Six case studies depicting the deliberate self-harm syndrome. Curationis 1993; 16:50-5. [PMID: 8334741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
This article comprises information on self-mutilation (and specifically on the Deliberate Self-harm Syndrome) which obtained from a study of mainly American and British literature. Included is data obtained from interviews conducted with a sample of South Africans suffering from the syndrome. Etiology was explained from both a psychological and biological perspective. The former highlighted deficiencies in coping and communication skills while the latter highlighted the compulsive and pain-killer role that endorphines play. From case studies and literature it was possible to clearly distinguish the Deliberate Self-harm Syndrome as a distinct disorder-a syndrome consisting of deliberate, repetitive and private acts of self-harm in the form of cutting, burning and banging oneself. This culminates in extreme tension release.
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Roenigk HH, Kuzel T, Rosen S. Interferons for cutaneous T-cell lymphoma monotherapy or combination with PUVA. Australas J Dermatol 1993; 34:13-5. [PMID: 8240181 DOI: 10.1111/j.1440-0960.1993.tb00839.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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206
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Kwittken PL, Rosen S, Sweinberg SK. MMR vaccine and neomycin allergy. AMERICAN JOURNAL OF DISEASES OF CHILDREN (1960) 1993; 147:128-9. [PMID: 8427228 DOI: 10.1001/archpedi.1993.02160260018005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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207
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Travers J, Akey L, Chen S, Rosen S, Paulson G, Travers S. Taste preferences in Parkinson's disease patients. Chem Senses 1993. [DOI: 10.1093/chemse/18.1.47] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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208
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Brown LF, Berse B, Tognazzi K, Manseau EJ, Van de Water L, Senger DR, Dvorak HF, Rosen S. Vascular permeability factor mRNA and protein expression in human kidney. Kidney Int 1992; 42:1457-61. [PMID: 1474780 DOI: 10.1038/ki.1992.441] [Citation(s) in RCA: 203] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Vascular permeability factor (VPF), also known as vascular endothelial growth factor (VEGF), is a potent microvascular permeability-enhancing mediator as well as a selective mitogen for vascular endothelium. In this study, in situ hybridization and immunohistochemistry co-localized VPF mRNA and protein to glomerular visceral epithelial cells in human kidneys. Northern analysis confirmed the presence of VPF mRNA of expected size. The finding of VPF in renal glomerular epithelium identifies a potent mediator of permeability and endothelial proliferation whose role in renal physiology and pathology requires investigation.
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Roman MJ, Saba PS, Pini R, Spitzer M, Pickering TG, Rosen S, Alderman MH, Devereux RB. Parallel cardiac and vascular adaptation in hypertension. Circulation 1992; 86:1909-18. [PMID: 1451262 DOI: 10.1161/01.cir.86.6.1909] [Citation(s) in RCA: 216] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
BACKGROUND Although vascular damage in the noncoronary circulation is a major cause of complications in hypertension, relatively little is known of the in vivo geometry and function of the arterial circulation in patients with uncomplicated hypertension or of their relation to left ventricular hypertrophy, a marker of enhanced risk of cardiovascular complications. METHODS AND RESULTS Wall thickness and internal diameter of the common carotid artery and the presence of atherosclerosis within the extracranial carotid arteries were determined by ultrasound in 43 asymptomatic hypertensive patients and 43 normotensive subjects matched for sex, age, and body size. Vascular stiffness was estimated from simultaneous superimposed carotid pressure waveforms obtained with an external solid-state transducer. Left ventricular size and function were determined echocardiographically. Compared with normal subjects, hypertensive patients had greater left ventricular absolute and relative wall thicknesses, left ventricular mass, and carotid absolute and relative wall thicknesses (p < 0.005). Carotid intimal-medial thickness exceeded the 95th percentile of normal values in 28% of hypertensive patients (p < 0.01). Carotid atherosclerosis was equally prevalent within the two blood pressure groups and was associated with older age, larger left ventricular and carotid wall thicknesses, and carotid diameter. Despite similar carotid pulse pressures, vascular stiffness was significantly increased in the hypertensive patients. Among the population as a whole, significant relations existed between cardiac and vascular wall thicknesses and internal dimensions. In multivariate analyses, these relations were statistically independent of age and blood pressure. CONCLUSIONS The present study documents the presence of geometric and functional changes within the common carotid artery in uncomplicated hypertension that parallel findings within the left ventricle. The potential contribution of these changes to the cardiovascular complications of hypertension, particularly in the setting of left ventricular hypertrophy, is unknown.
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Rosen S, Spokes K, Brezis M, Silva P, Epstein FH. Toxicity of adenine nucleotides in the isolated perfused kidney: selective destruction of the S2 segment of the proximal tubule. VIRCHOWS ARCHIV. B, CELL PATHOLOGY INCLUDING MOLECULAR PATHOLOGY 1992; 61:169-77. [PMID: 1685278 DOI: 10.1007/bf02890419] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
In an attempt to ameliorate the morphological abnormalities and decreased renal function produced by hypoxia in the isolated perfused rat kidney, adenosine triphosphate (ATP) was added to the perfusate medium. No improvement was noted in the histological changes or renal function. Paradoxically, however, in oxygenated control kidneys, ATP (2.5-10 mM), caused a severe injury remarkably limited to the S2 segments of proximal tubule. This injury was more destructive than that observed with complete ischemia for the same period of time or with inhibitors of glycolysis, intermediary metabolism, or respiratory chain function. Tubular damage produced by ATP was paradoxically prevented by hypoxia and mitochondrial inhibition. The mechanism of this selective toxic injury to the proximal tubule remains unclear and may depend upon intact transport metabolism of the cell.
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Bennett WM, Elzinga LW, Porter GA, Rosen S. The effects of pentoxifylline on experimental chronic cyclosporine nephrotoxicity. Transplantation 1992; 54:1118-20. [PMID: 1465783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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212
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Rosen S. Temporal information in speech: acoustic, auditory and linguistic aspects. Philos Trans R Soc Lond B Biol Sci 1992; 336:367-73. [PMID: 1354376 DOI: 10.1098/rstb.1992.0070] [Citation(s) in RCA: 708] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The temporal properties of speech appear to play a more important role in linguistic contrasts than has hitherto been appreciated. Therefore, a new framework for describing the acoustic structure of speech based purely on temporal aspects has been developed. From this point of view, speech can be said to be comprised of three main temporal features, based on dominant fluctuation rates: envelope, periodicity, and fine-structure. Each feature has distinct acoustic manifestations, auditory and perceptual correlates, and roles in linguistic contrasts. The applicability of this three-featured temporal system is discussed in relation to hearing-impaired and normal listeners.
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Stillman IE, Brezis M, Greenfeld Z, Ransil BJ, Heyman SN, Rosen S. Cyclosporine nephropathy: morphometric analysis of the medullary thick ascending limb. Am J Kidney Dis 1992; 20:162-7. [PMID: 1496970 DOI: 10.1016/s0272-6386(12)80545-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The effects of cyclosporine A (CsA) (12.5 mg/kg/d) on the medullary thick ascending limb (mTAL) were studied in five experimental groups: vehicle-treated control (C), salt depletion (SD), cyclosporine (CsA), and the combination of both salt depletion and cyclosporine for 3 (CsA-SD:S) and 8 (CsA-SD:L) weeks. Evaluation was performed on 1-micron plastic horizontal sections. mTALs were classified as either atrophic or nonatrophic by assessing mitochondrial density. The mean cross-sectional area of atrophic mTALs was found to be significantly smaller than the mean of nonatrophic mTALs in all treatment groups. The percentage of atrophic tubules was found to be significantly increased in both CsA-SD groups as compared with the other three treatment groups (P less than 0.01). Regression analysis indicated a rectangular hyperbolic relationship between the percentage of atrophic tubules and mean nonatrophic tubule cross-sectional area (P less than 0.0001). Thus, low levels of injury are associated with a rapid increase in cross-sectional tubular area (hypertrophy), and this response plateaued with increasing degrees of injury. Terminal plasma creatinine correlated with nonatrophic tubular cross-section area (r = 0.52, P less than 0.003). These studies indicate that CsA induces mTAL atrophy, which is more extensive with salt depletion. With limited injury, hypertrophy develops. However, the hypertrophic response cannot be sustained with increasing degrees of injury. The phenomenon of mTAL atrophy and hypertrophy is particularly important, since hypertrophy itself is a known risk factor for mTAL injury.
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214
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Rosen S, Stock D. Auditory filter bandwidths as a function of level at low frequencies (125 Hz-1 kHz). THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 1992; 92:773-781. [PMID: 1506531 DOI: 10.1121/1.403946] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Auditory filter bandwidths were measured using the symmetric notched-noise method in five normally hearing listeners at four masker levels (40-70 dB SPL/Hz in 10-dB steps) and four probe frequencies (125-1000 Hz in octave steps). Accurate stimulus spectrum shape and level were ensured by use of a headphone monitoring technique. Auditory filter bandwidths decreased with decreasing frequency from 1 kHz down to 125 Hz. On the whole, bandwidths increased with increasing level, but the effect of level on bandwidth was greater as frequency increased, with little or no effect of level at 125 Hz. Insofar as the results from the notched-noise method reflect basilar membrane vibration patterns, basilar membrane mechanics appear to become less nonlinear as one approaches the apex of the cochlea.
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Heyman SN, Clark BA, Kaiser N, Spokes K, Rosen S, Brezis M, Epstein FH. Radiocontrast agents induce endothelin release in vivo and in vitro. J Am Soc Nephrol 1992; 3:58-65. [PMID: 1391709 DOI: 10.1681/asn.v3158] [Citation(s) in RCA: 160] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The intravascular administration of the ionic radiocontrast agent sodium iothalamate (2.9 g of iodine/kg body wt) to rats induced an increase in plasma concentration of immunoreactive endothelin from 21.3 +/- 1.2 to 36 +/- 3 fmol/mL, preceded by a transient rise in the plasma level of atrial natriuretic peptide and associated with a fall in RBF. Equi-iodine amounts of the nonionic agents ioxaglate and iohexol elicited similar or more marked changes in plasma endothelin, but hypertonic solutions of NaCl, mannitol, or glucose did not. Comparable levels of endothelin produced by infusions of endothelin-1 induced a reduction of up to 29% in RBF. Iothalamate and iohexol stimulated endothelin release from cultured bovine endothelial cells, suggesting a direct effect of ionic and nonionic agents on vascular endothelium. The data invite speculation that under some circumstances endothelin release might play a role in the circulatory changes caused by these compounds and in the pathogenesis of radiocontrast nephropathy.
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Heyman S, Spokes K, Rosen S, Epstein FH. Mechanism of glycine protection in hypoxic injury: analogies with glycine receptor. Kidney Int 1992; 42:41-5. [PMID: 1321929 DOI: 10.1038/ki.1992.258] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Addition of glycine to the recirculating perfusate of isolated perfused rat kidneys protects against hypoxic injury to the medullary thick ascending limb and slows functional deterioration in the course of perfusion. This effect is dependent on dose; the earliest significant protection is seen at 0.25 mM, and the protective effects increase as glycine concentration is increased to 2 mM, the highest level tested. Two specific agonists of the strychnine-insensitive (NMDA) glycine receptor in neural membranes, 1-aminocyclopropane carboxylic acid (ACC) and d-serine, also exerted a cytoprotective effect at a concentration of 2 mM. On the other hand, 1-serine and taurine, ineffective agonists of the NMDA-glycine receptor but effective agonists of the strychnine-sensitive glycine receptor, had no protective effect in this system. Two antagonists to glycine at its binding site on the N-methyl-D-Aspartate (NMDA) receptor, 7-chlorokynurenic acid (2 mM) and indole-2-carboxylic acid (12.5 mM), did not reverse the cytoprotective action of 0.25 mM glycine. The data are consistent with a ligand-acceptor type of interaction to account for cytoprotection. The configuration of the glycine acceptor may resemble, but is not identical with, that of certain glycine receptors in the nervous system.
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Heyman SN, Brezis M, Epstein FH, Spokes K, Rosen S. Effect of glycine and hypertrophy on renal outer medullary hypoxic injury in ischemia reflow and contrast nephropathy. Am J Kidney Dis 1992; 19:578-86. [PMID: 1595707 DOI: 10.1016/s0272-6386(12)80838-9] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Glycine preserves tubular cell integrity under hypoxic and toxic conditions in vitro. It also ameliorates cisplatin nephrotoxicity in vivo. We studied the effect of glycine on tubular necrosis from ischemia reflow and on inner stripe injury in an animal model of radiocontrast nephropathy. In all experiments, glycine (75 mg/100 g/h) increased tubular damage in the inner stripe. In the model of radiocontrast nephropathy, the percentage of medullary thick ascending limb (mTAL) necrosis at 24 hours increased from 22% +/- 6% to 41% +/- 9% or 55% +/- 7% with glycine infusion of 75 or 135 minutes, respectively (mean +/- SE, P less than 0.05, analysis of variance [ANOVA]). Renal function was not significantly affected. In rat kidneys subjected to ischemia reflow, mTAL injury following glycine increased from 1% +/- 0% to 12% +/- 6% (P less than 0.05) and from 8% +/- 5% to 49% +/- 8% (P less than 0.01) 24 hours after 30 minutes and 45 minutes ischemia, respectively. Tubular injury in the inner stripe was maximal in the deep interbundle zone, typical of hypoxic, rather than reperfusion, injury. Prior uninephrectomy increased inner stripe damage, but protected the proximal tubules. Both uninephrectomy and glycine infusion were found to contribute to mTAL necrosis. The infusion of glycine for 1 hour in intact rats increased renal blood flow by 44% and tripled urine volume (P less than 0.01). A parallel increase in glomerular filtration rate GFR; by 22% over 90 minutes) fell short of statistical significance.(ABSTRACT TRUNCATED AT 250 WORDS)
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218
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Rieser JJ, Hill EW, Talor CR, Bradfield A, Rosen S. Visual experience, visual field size, and the development of nonvisual sensitivity to the spatial structure of outdoor neighborhoods explored by walking. J Exp Psychol Gen 1992. [PMID: 1534833 DOI: 10.1037//0096-3445.121.2.210] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
When places are explored without vision, observers go from temporally sequenced, circuitous inputs available along walks to knowledge of spatial structure (i.e., straight-line distances and directions characterizing the simultaneous arrangement of the objects passed along the way). Studies show that a life history of vision helps develop nonvisual sensitivity, but they are unspecific on the formative experiences or the underlying processes. This study compared judgments of straight-line distances and directions among landmarks in a familiar area of town by partially sighted persons who varied in types and ages of visual impairment. Those with early childhood loss of broad-field vision and those blind from birth performed significantly worse than those with early or late acuity loss and those with late field loss. Broad-field visual experience facilitates perceptual development by providing a basis for proprioceptive and efferent information from locomotion against distances and directions relative to the surrounding environment. Differences in the perception of walking, in turn, cause the observed differences in sensitivity to spatial structure.
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219
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Faulkner A, Ball V, Rosen S, Moore BC, Fourcin A. Speech pattern hearing aids for the profoundly hearing impaired: speech perception and auditory abilities. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 1992; 91:2136-2155. [PMID: 1597605 DOI: 10.1121/1.403674] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A family of prototype speech pattern hearing aids for the profoundly hearing impaired has been compared to amplification. These aids are designed to extract acoustic speech patterns that convey essential phonetic contrasts, and to match this information to residual receptive abilities. In the first study, the presentation of voice fundamental frequency information from a wearable SiVo (sinusoidal voice) aid was compared to amplification in 11 profoundly deafened adults. Intonation reception was often better, and never worse, with fundamental frequency information. Four subjects scored more highly in audio-visual consonant identification with fundamental frequency information, five performed better with amplified speech, and two performed similarly under these two conditions. Five of the 11 subjects continued use of the SiVo aid after the tests were complete. A second study examined a laboratory prototype compound speech pattern aid, which encoded voice fundamental frequency, amplitude envelope, and the presence of voiceless excitation. In five profoundly deafened adults, performance was better in consonant identification when additional speech patterns were present than with fundamental frequency alone; the main advantage was derived from amplitude information. In both consonant identification and connected discourse tracking, performance with appropriately matched compound speech pattern signals was better than with amplified speech in three subjects, and similar to performance with amplified speech in the other two. In nine subjects, frequency discrimination, gap detection, and frequency selectivity were measured, and were compared to speech receptive abilities with both amplification and fundamental frequency presentation. The subjects who showed the greatest advantage from fundamental frequency presentation showed the greatest average hearing losses, and the least degree of frequency selectivity. Compound speech pattern aids appear to be more effective for some profoundly hearing-impaired listeners than conventional amplifying aids, and may be a valuable alternative to cochlear implants.
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Oxhorn V, Rosen S. Understanding the regulatory arena. AORN J 1992; 55:623-9. [PMID: 1536557 DOI: 10.1016/s0001-2092(07)68628-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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221
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Rosen S, Epstein FH, Brezis M. Determinants of intrarenal oxygenation: factors in acute renal failure. Ren Fail 1992; 14:321-5. [PMID: 1509164 DOI: 10.3109/08860229209106636] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Oxygen tension within the renal parenchyma is influenced by two factors: metabolic demand and oxygen supply. There are three regions within the kidney in which there is an anatomical basis for limited oxygen availability. The first is the inner stripe where oxygen diffusion between arterial and venous vasa recta reduces PO2. The other two are the outer stripe and medullary rays which are fed by O2-poor blood from venous vasa recta. The balance between oxygen demand and supply is most critical in the inner stripe where the PO2 is most influenced by transport activity. In contrast, altering transport activities in the outer stripe will not change the prevalence of hypoxic S3 injury but will alter its type (i.e., cell fragmentation related to high GFR and increased workload versus cell edema related to low GFR and minimal workload). The effect of transport activity on medullary ray PO2 has not been well defined. Using sensitive oxygen microelectrodes, cortical PO2 (52 +/- 2 mm Hg) in the rat was found to be higher than medullary PO2 (21 +/- 2 mm Hg, p less than 0.001). How are these observations reflected in current models of acute renal failure? The ischemia-reflow model affects proximal tubules with a predilection for S3 (located within the outer stripe of medulla) after short-term ischemia. With hyperfiltration (induced by glycine or renal hypertrophy) and the pursuant increase in transport related O2 demand, hypoxic mTAL inner stripe injury becomes prominent. Renal parenchymal hypertrophy exaggerates injury in the contrast nephropathy model, in which mTAL inner stripe injury is a predominant feature and medullary PO2 is very low.(ABSTRACT TRUNCATED AT 250 WORDS)
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Heyman SN, Clark BA, Kaiser N, Epstein FH, Spokes K, Rosen S, Brezis M. In-vivo and in-vitro studies on the effect of amphotericin B on endothelin release. J Antimicrob Chemother 1992; 29:69-77. [PMID: 1737726 DOI: 10.1093/jac/29.1.69] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Since amphotericin B nephrotoxicity is mediated, in part by hypoxic tubular injury, the role of endothelin in the renal vasoconstriction, characteristic of amphotericin toxicity has been studied. Intact and salt depleted rats were infused with amphotericin B (20 micrograms/kg per min) or 5% dextrose over 20 min. Plasma endothelin levels determined at the conclusion of the infusion period, did not differ between the experimental groups, despite a marked reduction in renal blood flow noted in rats infused with amphotericin B. Amphotericin B (10(-5)-10(-7) M) did not stimulate endothelin release from cultured bovine aortic endothelial cells. However, in a model of chronic amphotericin nephrotoxicity produced by repeated daily intraperitoneal injections of amphotericin B (5 mg/kg) to salt depleted rats, renal failure was associated with elevated plasma endothelin levels (29.3 +/- 4.4 fmol/mL, vs 10.8 +/- 1.2 fmol/mL in salt depleted controls, P less than 0.01). We conclude that while plasma endothelin may be increased in chronic amphotericin B nephropathy, this peptide does not mediate the acute renal vasoconstriction associated with the infusion of this drug.
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Rieser JJ, Hill EW, Talor CR, Bradfield A, Rosen S. Visual experience, visual field size, and the development of nonvisual sensitivity to the spatial structure of outdoor neighborhoods explored by walking. ACTA ACUST UNITED AC 1992; 121:210-21. [PMID: 1534833 DOI: 10.1037/0096-3445.121.2.210] [Citation(s) in RCA: 75] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
When places are explored without vision, observers go from temporally sequenced, circuitous inputs available along walks to knowledge of spatial structure (i.e., straight-line distances and directions characterizing the simultaneous arrangement of the objects passed along the way). Studies show that a life history of vision helps develop nonvisual sensitivity, but they are unspecific on the formative experiences or the underlying processes. This study compared judgments of straight-line distances and directions among landmarks in a familiar area of town by partially sighted persons who varied in types and ages of visual impairment. Those with early childhood loss of broad-field vision and those blind from birth performed significantly worse than those with early or late acuity loss and those with late field loss. Broad-field visual experience facilitates perceptual development by providing a basis for proprioceptive and efferent information from locomotion against distances and directions relative to the surrounding environment. Differences in the perception of walking, in turn, cause the observed differences in sensitivity to spatial structure.
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Lipman ML, Stevens AC, Bleackley RC, Helderman JH, McCune TR, Harmon WE, Shapiro ME, Rosen S, Strom TB. The strong correlation of cytotoxic T lymphocyte-specific serine protease gene transcripts with renal allograft rejection. Transplantation 1992; 53:73-9. [PMID: 1733089 DOI: 10.1097/00007890-199201000-00014] [Citation(s) in RCA: 83] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Several immune mechanisms are likely to be responsible for renal allograft rejection. The relative importance of delayed-type hypersensitivity versus cytotoxic T lymphocytes is controversial. We analyzed human renal allografts biopsies for intragraft expression of IL-1 beta, IL-6, and TNF alpha genes--putative mediators of DTH--as well as IL-2, IL-2 receptor (R) beta, and a CTL-specific serine protease gene. Total RNA was extracted from tissue samples and the mRNA fraction was converted to cDNA using oligo dT and reverse transcriptase. Then cDNA was amplified by the polymerase chain reaction (PCR) for 35 cycles using specific oligonucleotide primers. Each PCR analysis included beta-actin oligonucleotide primers to coamplify this constitutively expressed gene as an internal control. A total of 24 core allograft biopsies were studied and classified into a 3 histological categories: acute cellular rejection, equivocal components of rejection, and no evidence of rejection. There was no statistically significant difference in beta-actin expression among these histologic categories (P greater than 0.08). Interestingly, in this sample size, no significant difference was found between rejecting and nonrejecting samples for transcripts of any of the cytokines or IL-2R beta mRNAs. Apparently, DTH-like mechanisms are present in all allografts. However, detection of CTL-specific serine protease gene expression was almost exclusive to rejecting samples (P less than 0.003). These findings suggest that activation of CTLs play an active, but hardly exclusive, role as effectors of graft dysfunction in the rejection process. While this study does not define the relative importance of the genes examined, it does suggest that evidence of CTL-specific serine protease expression may provide a means of monitoring for rejection episodes or as a diagnostic aid when conventional diagnostic criteria are not conclusive.
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Teresi JA, Holmes D, Bloom HG, Monaco C, Rosen S. Factors differentiating hospital transfers from long-term care facilities with high and low transfer rates. THE GERONTOLOGIST 1991; 31:795-806. [PMID: 1800253 DOI: 10.1093/geront/31.6.795] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
This paper examines the factors that account for differences among nursing homes in terms of the rates at which they transfer patients to hospitals. Data from nursing staff and charts were collected on the 286 most recent transfers from 10 nursing homes. Discriminant function analyses indicated that from relatively equivalent patient populations, high-rate facilities tended to transfer the more chronically ill, physically frail patients; patients with infection (a potentially treatable condition within the long-term care facility); and to make transfers because of lack of resources such as a lab and X-ray equipment. Lack of IV therapy, while a frequently cited primary nonmedical reason for transfer, did not discriminate between high- and low-transfer-rate facilities.
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