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 21 January 2018

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News

Effect of acute acoustic stress on anorectal function and sensation

Acute acoustic stimulation increases anxiety scores, decreases rectal compliance, and enhances perception of severe urgency to balloon distention in healthy volunteers, offering insight into the pathogenesis of stress-induced diarrhoea, reports the latest issue of Neurogastroenterology and Motility.

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Little is known about the effects of acute acoustic stress on anorectal function.

Dr Chey and colleagues from Michigan, America determined the effects of acute acoustic stress on anorectal function and sensation in healthy volunteers.

The researchers chose 10 healthy volunteers (7 males and 3 females with a mean age of 34 years) who underwent anorectal manometry, testing of rectal compliance and sensation using a barostat with and without acute noise stress on separate days.

The research team assessed rectal perception using an ascending method of limits protocol and a 5-point Likert scale.

Less intraballoon volume was needed to induce the sensation of severe urgency with acoustic stress
Neurogastroenterology and Motility

Arousal and anxiety status were evaluated by the investigators using a visual analogue scale.

The researchers noted that acoustic stress significantly increased anxiety scores and rectal compliance was significantly decreased with acoustic stress compared with control.

In addition, the investigative team showed that less intraballoon volume was needed to induce the sensation of severe urgency with acoustic stress.

The investigators also observed that acoustic stress had no effect on hemodynamic parameters, anal sphincter pressure, threshold for first sensation, sensation of stool, or pain.

Dr Chey concludes that, “Acute acoustic stimulation increased anxiety scores, decreased rectal compliance, and enhanced perception of severe urgency to balloon distention but did not affect anal sphincter pressure in healthy volunteers.”

“These results may offer insight into the pathogenesis of stress-induced diarrhoea and faecal urgency.

Neurogastroenterology and Motility 2005: doi:10.1111/j.1365-2982.2004.00592.x
09 March 2005

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