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Hello, paragraph: "VVS originates with activation of specific areas ... and abolition of sympathetic tone." added on 11/11/2015 by 129.22.21.205 is an exact copy paste of p.579 in the book Medical Physiology by Boron and Boulpaep. I guess I could add a source but it seems like plagiarism to me.— Precedingunsigned comment added by2A02:1810:411:A300:E09F:7952:F39D:D1DE (talk)12:45, 14 January 2018 (UTC)[reply]
Does anyone know of any physiological process which would cause one the need to defecate when feeling a vasovagal syncope aura, and having symptoms subside post-defecation? Thanks.Aglassonion (talk)10:50, 3 February 2009 (UTC)[reply]
Look up valvasa maneuver...it is due to an increased intrathoracic pressure which reduces bloodflow to the chest and decreases stroke volume/cardiac output—Precedingunsigned comment added byJohericd (talk •contribs)21:32, 20 June 2010 (UTC)[reply]
2003 but looks useful:PMID 12717149JFW | T@lk23:26, 9 August 2012 (UTC)[reply]