Urodynamic function during sleep-like brain states in urethane anesthetized rats

J Crook, T Lovick

Research output: Contribution to journalArticle (Academic Journal)peer-review

12 Citations (Scopus)
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Abstract

The aim was to investigate urodynamic parameters and functional excitability of the periaqueductal gray matter (PAG) during changes in sleep-like brain states in urethane anesthetized rats. Simultaneous recordings of detrusor pressure, external urethral sphincter (EUS) electromyogram (EMG), cortical electroencephalogram (EEG), and single-unit activity in the PAG were made during repeated voiding induced by continuous infusion of saline into the bladder. The EEG cycled between synchronized, high-amplitude slow wave activity (SWA) and desynchronized low-amplitude fast activity similar to slow wave and 'activated' sleep-like brain states. During (SWA, 0.5-1.5Hz synchronized oscillation of the EEG waveform) voiding became more irregular than in the 'activated' brain state (2-5Hz low-amplitude desynchronized EEG waveform) and detrusor void pressure threshold, void volume threshold and the duration of bursting activity in the external urethral sphincter EMG were raised. The spontaneous firing rate of 23/52 neurons recorded within the caudal PAG and adjacent tegmentum was linked to the EEG state, with the majority of responsive cells (92%) firing more slowly during SWA. Almost a quarter of the cells recorded (12/52) showed phasic changes in firing rate that were linked to the occurrence of voids. Inhibition (n=6), excitation (n=4) or excitation/inhibition (n=2) was seen. The spontaneous firing rate of 83% of the micturition-responsive cells was sensitive to changes in EEG state. In nine of the 12 responsive cells (75%) the responses were reduced during SWA. We propose that during different sleep-like brain states changes in urodynamic properties occur which may be linked to changing excitability of the micturition circuitry in the periaqueductal gray.

Original languageEnglish
Pages (from-to)73-82
Number of pages10
JournalNeuroscience
Volume313
Early online date19 Nov 2015
DOIs
Publication statusPublished - 28 Jan 2016

Keywords

  • micturition
  • urethane
  • sleep-like EEG state
  • periaqueductal gray
  • rat
  • bladder urodynamics

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