The polysomnography was performed using a polysomnography monitor (Nicolet v32, Natus Medical Incorporated, Pleasanton, CA, USA). BPPV patients were evaluated in the recovery period of complete vertigo remission, and VM patients were evaluated in the intermission period of vertigo attacks. All participants were evaluated at the sleep electroencephalogram center monitoring room of our hospital, and the sleep was not affected by the outside world. The monitoring time was from 9:00 p.m. to 6:00 a.m., and the bed rest time was more than 7 h. Coffee, coke, tea, painkillers, and cold medicines were prohibited from the day before the examination. The monitoring indexes included electroencephalogram, electrooculogram, thoracic and abdominal respiratory movement, transcutaneous oxygen saturation, and heart rate.
Nicolet v32
Manufactured by Natus
Sourced in United States
The Nicolet v32 is a high-performance electroencephalography (EEG) system designed for clinical and research applications. It features a 32-channel digital amplifier and offers advanced signal processing capabilities for the assessment of neurological function.
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Lab products found in correlation
5 protocols using nicolet v32
1
Polysomnographic Evaluation of BPPV and VM
2
Polysomnographic Sleep Evaluation Protocol
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Overnight video PSG examinations were performed for all participants using the sleep laboratory digital system (Nicolet v32, Natus Medical Incorporated, Pleasanton, CA). Participants were asked to sleep at their usual bedtimes.
All PSG sessions were monitored by trained technicians who scored the results visually according to standardized criteria.10 (link) The following PSG sleep parameters were recorded and systematically evaluated: (1) total time in bed (TIB); (2) total sleep time (TST); (3) sleep efficiency (SE; the TST/TIB ratio expressed as a percentage); (4) sleep latency (SL; the length of time to sleep onset); (5) wake after sleep onset (WASO; the number of minutes of wakefulness after the onset of persistent sleep to the end of the PSG recording); (6) non-REM sleep stages 1, 2, and 3 and REM sleep stages N1, N2, N3, and REM; (7) the apnea-hypopnea index; (8) periodic leg movements (PLMs) per hour of sleep (PLMs/h >5 was used as the standard to indicate PLMs in sleep PSG; and (9) mean oxygen saturation Spo 2 and nadir Spo 2. These parameters were analyzed by a specialist in a blinded fashion before comparisons were made between groups. International Classification of Sleep Disorders-2 was used to diagnose and classify sleep abnormalities.11
All PSG sessions were monitored by trained technicians who scored the results visually according to standardized criteria.10 (link) The following PSG sleep parameters were recorded and systematically evaluated: (1) total time in bed (TIB); (2) total sleep time (TST); (3) sleep efficiency (SE; the TST/TIB ratio expressed as a percentage); (4) sleep latency (SL; the length of time to sleep onset); (5) wake after sleep onset (WASO; the number of minutes of wakefulness after the onset of persistent sleep to the end of the PSG recording); (6) non-REM sleep stages 1, 2, and 3 and REM sleep stages N1, N2, N3, and REM; (7) the apnea-hypopnea index; (8) periodic leg movements (PLMs) per hour of sleep (PLMs/h >5 was used as the standard to indicate PLMs in sleep PSG; and (9) mean oxygen saturation Sp
3
Overnight Polysomnography for Sleep Assessment
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All the subjects were observed with overnight video PSG using a digital sleep laboratory system (Nicolet v32, Natus Medical Incorporated, Pleasanton, CA). Participants were instructed to go to sleep at their usual bedtimes. All PSG sessions were monitored by a trained technician according to standardized criteria (Hakkinen et al., 1993 ). The following sleep variables were acquired and analyzed: sleep latency (SL); REM SL; sleep efficiency (SE); total sleep time (TST); the percentage of stage N1, N2, N3, and REM sleep; the apnea–hypopnea index (AHI); the periodic leg movement index (PLMI); average SpO2; and minimum SpO2.
4
Resting-State EEG Data Collection
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The resting-state EEG was collected by 32-channel digital video-EEG systems (Nicolet v32, Natus Neurology Incorporated, Middleton, WI, USA). All electrodes were positioned in compliance with the international 10/20 system. The impedance of each electrode was kept below 5 kΩ, and electrode AFz was set as the reference. EEG was band-pass filtered at 0.01–100 Hz and sampled at 500 Hz.
5
Long-range video EEG protocol
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After admission, the patients were examined using 16-hour long-range video EEG. For the EEG (Nicolet V32, Natus Medical, Middleton, WI, United States), the scalp electrodes were placed according to the international 10-20 system estimation method. Bilateral earlobes or average leads were used as reference points, and bipolar leads were recorded. The patients were recorded during the open-close eyes test, hyperventilation, and photic stimulation activation.
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