脑干听觉诱发电位对老年突发性耳聋的诊断价值

目的 探讨脑干诱发电位在老年突发性耳聋患者的诊断价值.方法 对41例老年突发性耳聋患者入院24h内及治疗18d后进行疗效评价和脑干听觉诱发电位(BAEP)检查.结果 41例患者BAEP检测的异常率为100%,治疗有效率70.7%.治疗后BAEP Ⅰ、Ⅲ、Ⅴ波和峰间潜伏期与治疗前相比明显好转,结果具有显著性差异(P＜0.05),治疗有效组较无效组明显好转,结果具有显著性差异(P＜0.05).结论 BAEP是诊断突聋和判断预后的重要客观指标.     

Findings confirming brainstem generators of auditory evoked potentials by stereotactic lesions in the rabbit

The origin of brainstem auditory evoked potentials (BAEP) was rnvestigated experimentally with morphologically verified stereotactic lesions in eleven rabbits. Waves were recorded before and after thermocoagulation. The loss of waves III and V following coagulation in the inferior colliculus and the upper pons respectively, supports Jewett's hypothesis.     

脑白质疏松症脑干听觉诱发电位研究

在２４例经颅脑ＣＴ确诊的脑白质疏松症和２０例健康老年人中进行脑干听觉诱发电位（ＢＡＥＰ）研究。结果，病例组ＢＡＥＰ总异常１９例，异常率８３．３％，Ⅲ、Ⅴ波波峰潜伏期及各峰间潜伏期异常率较高；病例组Ⅲ、Ⅴ峰潜伏期及Ⅰ～Ⅲ、Ⅲ～Ⅴ、Ⅰ～Ⅴ峰间潜伏期均数比对照组大，ｔ－检验；Ｐ＜０．０１。结论：在脑白质疏松症早期临床未提示脑干功能受累时，脑干电生理功能已出现异常ＢＡＥＰ可作为脑白质疏松症脑干功能受累的客观指标在临床上推广应用。     

前庭阵发症脑干听觉诱发电位的特点

目的探讨前庭阵发症(VP)脑干听觉诱发电位(BAEP)的特点。方法对51例VP患者的BAEP结果进行回顾性分析。结果 BAEP异常者40例,异常率为78.4%。与Ⅰ-Ⅲ波峰间期正常的患者相比,Ⅰ-Ⅲ波峰间期延长的患者男性比例高(χ2=4.763,P=0.029),病程显著延长(t=2.469,P=0.021),而平均年龄差异无统计学意义。与Ⅲ-Ⅴ波峰间期正常的患者比较,Ⅲ-Ⅴ波峰间期延长的患者男性比例、平均病程、平均年龄差异均无统计学意义。与Ⅰ-Ⅲ波峰间期耳间差正常的患者比较,Ⅰ-Ⅲ波峰间期耳间差延长的患者病程相对较长(P=0.055),男性有增多趋势(P=0.058),但差异无统计学意义。结论 VP患者BAEP异常以Ⅰ-Ⅲ波峰间期延长为主,且以男性更多见。病程越长,蜗神经越易受累。     

脑干听觉诱发电位在弥漫性轴索损伤中的应用

目的探讨脑干听觉诱发电位(BAEP)在弥漫性轴索损伤(DAI)的临床诊断及预后评估的价值。方法对52例DAI患者进行。BAEP反复测定,动态观察病情转化过程中BAEP各波的变化。结果①本研究中CT 对DAI的检出率为28．8％,BAEP总异常率为73．1％,经x2检验,两者差别有统计学意义。②在本研究中病例组 BAEP与对照组行t检验比较,两者差别有统计学意义。③BAEP分级与GCS、GOS的相关系数分别为-0．51022、 -0．5539,BAEP分级与GCS及GOS之间呈明显的负相关(P<0．0001)。结论BAEP可从电生理角度评价脑干的功能状态,有助于临床对脑干损伤的诊断、病情监测、疗效评估和预后判断。BAEP是评价DAI患者中脑干损伤后脑干功能和患者预后的客观指标。     

脑干听觉诱发电位对进展性卒中的早期诊断价值

目的分析脑干听觉诱发电位在进展性卒中早期的变化及其对早期诊断的价值。方法应用诱发电位仪对发病24h内43例颈内动脉系统进展性卒中与非进展性卒中患者进行检测及对比分析。结果进展性卒中早期,起源于脑干的Ⅲ、V波异常率达62.79%,其异常主要以双侧V波PL及I-V波IPL的延长为主,与对照组比较,差异有统计学意义(P<0.01)。结论脑干听觉诱发电位可作为颈内动脉系统进展性脑卒中在临床症状、体征进展达到诊断标准前的一个有效的评估指标,有助于临床对进展性卒中进行早期的干预性治疗。     

脑干听觉诱发电位在脑干肿瘤术中监护

目的：研究双耳刺激、双侧记录的脑干听觉诱发电位在脑干肿瘤手术中的监护价值。方法：对３０例听力正常的健康受试者用双耳刺激、双侧记录和单耳刺激、同侧记录的方法检测其脑干听觉诱发电位；对１６例脑干肿瘤患者，用双耳刺激、双侧记录的脑干听觉诱发电位进行术中连续监护。结果：所有病人在手术操作时，均出现ＢＡＥＰｓ改变，按其改变程度大致可分为轻度改变、中度改变和重度改变三种。轻、中度改变者，临床效果良好；重度改变者，预后不良，甚至死亡。结论：双耳刺激双侧记录的ＢＡＥＰｓ更适用于手术中监护；术中ＢＡＥＰｓ改变程度能反映脑干功能受影响程度和能预测预后；Ⅲ波和／或Ｖ波的ＰＬ，Ⅰ－Ⅲ、Ⅰ－Ⅴ、Ⅲ－Ⅴ的ＩＰＬ延长超过１．５ｍｓ，或者全部波形消失，是脑干功能受到不可逆损害的具体指标     

Changes in auditory P300 event-related potentials and brainstem evoked potentials in diabetes mellitus

To investigate the influence of diabetes mellitus on higher cognitive functions electrophysiologically, we studied auditory P300 event-related potentials (P300) in 40 NIDDM patients, taking into account wave I-V latencies (I-V) in auditory brainstem evoked potentials, clinical parameters and head MRI findings. Compared with 20 controls, diabetics had significantly longer P300 and I-V latencies. P300 latencies in diabetics correlated with neither I-V. HbA₁, blood glucose levels, nor disease duration. Of the 13 diabetics investigated neuroradiologically, four had lacunar infarcts with prolonged electrophysiological values. The remaining nine had normal MRI scans, but their physiological parameters were still significantly longer than those of controls. These findings suggest that NIDDM can independently alter higher cognitive and the central auditory pathway functions. Our data also suggest that these alterations occur regardless of the recent metabolic derangement and disease duration. Cerebrovascular ischemia, if present, also appears to contribute in part to cognitive alterations.     

Prognostic evaluation of brainstem hematomas: the role of CT scan and brainstem auditory evoked potentials

Abstract– 6 cases of brainstem hematoma were studied utilizing CT scan and brainstem auditory evoked potential (BAEP) recordings. CT scan did not contribute to an early discrimination between primary and secondary hematomas. Size of the hematoma and the presence of blood in the CSF did not represent evident signs in differentiating benign from unfavourable brainstem hematomas or hemorrhages. BAEP recordings showed the presence of electrophysiological anomalies at the level of the lesion, demonstrating that bleeding as well as tumor in the brainstem can provoke a focal damage.     

Contralateral evoked brainstem auditory potentials as an indicator of intraoperative brainstem manipulation in cerebellopontine angle tumors

Abstract

Brainstem auditory evoked potentials (BAEP) were studied during operations to remove acoustic tumors using the retromastoid approach. BAEP were elicited from the side contralateral to the tumor, and changes in the latencies of peaks III and V of the BAEP were compared with changes in cardiovascular parameters throughout the operation. When the changes in the determined cardiovascular parameters were related to surgical manipulations, the related changes in the latencies of peaks III and V of the BAEP were more consistent than the changes in the cardiovascular parameters and they tended to occur earlier than the changes noted in the cardiovascular parameters. [Neurol Res 1996; 18: 528-540]     

Characteristics of brainstem auditory evoked potentials of students studying folk dance★

BACKGROUND： Previous experiments have demonstrated that brainstem auditory evoked potential is affected by exercise, exercise duration, and frequency.
OBJECTIVE： Comparing the brainstem auditory evoked potential of students studying folk dance to students studying other subjects. DESIGN： Observational contrast study.
SETTING： Physical Education College, Shandong Normal University PARTICIPANTS： Fifty-five female students were enrolled at Shandong Normal University between September and December in 2005, including 21 students that studied folk dance and 34 students that studied other subjects. The age of the folk dance students averaged （19 ± 1） years and dance training length was （6.0 ± 1.5） years. The students that studied other subjects had never taken part in dance training or other physical training, and their age averaged （22 ± 1） years, body height averaged （162 ± 5） cm, body mass averaged （51 ± 6） kg. All subjects had no prior ear disease or history of other neurological disorders. All students provided informed consent for the experimental project.
METHODS： The neural electricity tester, NDI-200 （Shanghai Poseidon Medical Electronic Instrument Factory） was used to examine and record Brainstem Auditory Evoked Potential values of the subjects during silence, as well as to transversally analyze the Brainstem Auditory Evoked Potential values. The electrode positions were cleaned and degreased with soapy water, followed by ethanol. The selected bipolar electrodes were situated on the head： recording electrodes were placed at the Baihui acupoint, and the reference electrode was placed at the mastoid of the measured ear, with grounding electrodes in the center of the forehead. Brainstem Auditory Evoked Potential values were elicited by monaural stimulation of a ＂click＂ though an earphone; the other ear was sheltered by the white noise. The click intensity was 102 db, the stimulation frequency was 30 Hz, the bandpass filters were 1 000-3 000 Hz, the sensitivity     

CT, somatosensory and brainstem auditory evoked potentials in the early prediction of functional outcome in putaminal hemorrhage

The CT and median somatosensory and brainstem auditory evoked potentials (SEP and BAEP) were studied in 80 patients with spontaneous putaminal hemorrhage for their values in the early prediction of functional outcome. The CT scan was performed within 2 days and EPs within a week after the onset of symptoms. The activities of daily living was assessed at 6 months. Patients with good functional recovery had the following findings: 1) the hemorrhage had not involved the thalamus or the posterior limb of the internal capsule; 2) the SEPs were normal or had prolonged central conduction time; and 3) the BAEP was normal. When the cortical SEPs were absent, the majority of patients were moderately or severely disabled. Attenuation or absence of BAEP wave V always forecast a grave prognosis. It is concluded that the combined use of CT, SEP and BAEP is an objective and reliable method for the early prediction of functional outcome in patients with putaminal hemorrhage.     

Selective attention differentially affects brainstem auditory evoked potentials of electrodermal responders and nonresponders

Brainstem auditory evoked potentials (BAEPs) were recorded in adult male chronic schizophrenics on maintenance neuroleptic therapy, drug-free alcoholics, and normal subjects. Subjects were subdivided into electrodermal responders (Rs) and nonresponders (NRs). Attention was directed toward auditory or visual stimuli. Independent of diagnosis, latencies of BAEP wave V were longer in NRs when visual rather than auditory stimuli were attended to, while there was no task effect for Rs. This finding is interpreted as a sign of excessive selective filtering of auditory stimuli in NRs. In the alcoholic NRs, wave I-V conduction times were longer than those in any other subgroup, possibly indicating retarded neural transmission.     

Detection of brainstem lesions in multiple sclerosis: comparison of brainstem auditory evoked potentials with nuclear magnetic resonance imaging

Topographical information provided by brainstem auditory evoked potentials (BAEPs) was investigated in 43 patients by comparison with cerebral nuclear magnetic resonance imaging (NMR). Lesions in the region of the brainstem auditory pathways were demonstrated by BAEPs in 44.2%, and in 39.5% by NMR. As regards brainstem levels, in 15/21 (71.4%) with abnormal findings at least one lesion was verified by NMR-matched BAEP results. The study confirms the topographical information provided by the BAEPs on the different levels of the brainstem, but not the assumption that generation of the BAEPs is predominantly ipsilateral. BAEPs retain their importance for the detection of disseminated lesions in the diagnosis of multiple sclerosis (MS) in the era of expensive imaging methods.     

脑干听觉诱发电位对癫(癎)患儿检测的意义

目的探讨脑干听觉诱发电位在癫患儿检测中的意义。方法对2000-01~2008-01我院38例癫患儿BAEP的检测结果进行总结。结果BAEP正常15例(39.5%),异常23例(60.5%),其中21例BAEP改变形式多样,异常指标相混出现。结论癫患者存在脑干功能异常。     

Age, sex and mental retardation related changes of brainstem auditory evoked potentials in Down's syndrome

Brainstem auditory evoked potentials (BAEPs) were recorded in 51 Down's syndrome (DS) subjects and compared with those of 38 normal controls; the correlations between the BAEP measures and age, sex, and degree of mental retardation were then evaluated. The DS patients showed a significant reduction in wave V latency and amplitude and in I–III, III–V, and I–V interpeak intervals. An age-related shortening of the I–V interpeak interval found in DS patients was interpreted as being a result of changes in central inhibitory/excitatory mechanisms. In both groups, female subjects presented an I–V interval shorter than that of males but this difference was greater in the DS subjects than in the normal population. The DS patients with severe mental retardation showed significantly longer I–V interpeak intervals than those with moderate retardation; this could be due to the presence of additional central nervous system abnormalities.

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Sommario I potenziali evocati auditivi tronco-encefalici (BAEP), registrati in 51 pazienti con sindrome di Down (SD), sono stati messi a confronto con quelli ottenuti in 38 soggetti normali di controllo. In seguito è stata valutata la correlazione tra i parametri dei BAEP con l'età, il sesso e il grado di ritardo mentale. I pazienti con SD mostravano una riduzione significativa della latenza e dell'ampiezza dell'onda V e della lunghezza dell'intervallo I–V, rispetto ai controlli. Una ulteriore riduzione età correlata dell'intervallo I–V è stata osservata nei pazienti con SD; questa è stata interpretata come il risultato di modificazioni dei meccanismi inibitori/eccitatori centrali. Le femmine con SD presentavano un intervallo I–V più breve di quello dei maschi in maniera più evidente che nella popolazione normale. Inoltre, i pazienti con ritardo mentale più grave mostravano un intervallo I–V significativamente più prolungato di quelli con ritardo mentale medio; questo potrebbe essere dovuto alla presenza di anomalie strutturali aggiuntive nei soggetti più compromessi.

     

Pentobarbital-induced changes in the mouse brainstem auditory evoked potential as a function of click repetition rate and time postdrug

The effects of pentobarbital (80 mg/kg, i.p.) and saline injections on the BAEP were studied in 10 adult female BDF1 mice. Pentobarbital anesthesia induced statistically significant increases in the amplitudes and latencies of various BAEP components relative to preinjection and saline control values. These pentobarbital-induced changes were maximal shortly after drug administration and dissipated over time in a pattern similar to a drug elimination curve. Since pentobarbital and fast stimulus repetition rates are considered to be 'synaptic stressors', it was predicted that pentobarbital anesthesia and click repetition rate would have combined effects on the BAEP. This prediction was partially supported in that pentobarbital-induced changes in P4 amplitude and latency were significantly dependent on click repetition rate. The pentobarbital-induced effects on earlier BAEP components, however, proved to be largely independent of click rate. Pentobarbital-associated changes in the BAEP were not due to such factors as core temperature changes, circadian variations, and stress. The importance of anesthetic-induced changes in the BAEP for clinical and experimental studies is discussed.     

Air pollution is associated with brainstem auditory nuclei pathology and delayed brainstem auditory evoked potentials

We assessed brainstem inflammation in children exposed to air pollutants by comparing brainstem auditory evoked potentials (BAEPs) and blood inflammatory markers in children age 96.3 ± 8.5 months from highly polluted (n = 34) versus a low polluted city (n = 17). The brainstems of nine children with accidental deaths were also examined. Children from the highly polluted environment had significant delays in wave III (t(50) = 17.038; p < 0.0001) and wave V (t(50) = 19.730; p < 0.0001) but no delay in wave I (p = 0.548). They also had significantly longer latencies than controls for interwave intervals I-III, III-V, and I-V (all t(50) > 7.501; p < 0.0001), consisting with delayed central conduction time of brainstem neural transmission. Highly exposed children showed significant evidence of inflammatory markers and their auditory and vestibular nuclei accumulated α synuclein and/or β amyloid_1-42. Medial superior olive neurons, critically involved in BAEPs, displayed significant pathology. Children's exposure to urban air pollution increases their risk for auditory and vestibular impairment.     

False-negative brainstem auditory evoked potential recordings in a case of multiple acoustic neuroma

Summary A case history is reported to demonstrate that electrophysiological testing (brainstem auditory evoked potentials, BAEP and stapedius reflex) may fail in the search for cerebello-pontine angle tumours. The clinical history began with repeated episodes indicating a disorder of the vestibular system. Repeated testing of BAEP exhibited normal curves before and after surgery on the right side. This case serves as a reminder that normal BAEP do not necessarily exclude the presence of an acoustic neuroma developing in the immediate vicinity of the vestibular nerve.