{"id":"https://openalex.org/W7223549321","doi":"https://doi.org/10.1093/eurheartj/ehag785.758","title":"Splanchnic circulatory failure drives vasovagal syncope: bioimpedance profiling of regional fluid shifts and dose-response characterisation of greater splanchnic nerve stimulation","display_name":"Splanchnic circulatory failure drives vasovagal syncope: bioimpedance profiling of regional fluid shifts and dose-response characterisation of greater splanchnic nerve stimulation","publication_year":2026,"publication_date":"2026-10-01","ids":{"openalex":"https://openalex.org/W7223549321","doi":"https://doi.org/10.1093/eurheartj/ehag785.758"},"language":"en","primary_location":{"id":"doi:10.1093/eurheartj/ehag785.758","doi":"https://doi.org/10.1093/eurheartj/ehag785.758","is_oa":true,"landing_page_url":"https://doi.org/10.1093/eurheartj/ehag785.758","pdf_url":"https://academic.oup.com/eurheartj/article-pdf/47/Supplement_1/ehag785.758/72477116/ehag785.758.pdf","source":{"id":"https://openalex.org/S181568219","display_name":"European Heart Journal","issn_l":"0195-668X","issn":["0195-668X","1522-9645"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-a","doyens","jufo-3","ki-jl-3","medline","norway-2","poland-200","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310311648","host_organization_name":"Oxford University Press","host_organization_lineage":["https://openalex.org/P4310311648","https://openalex.org/P4310311647"],"host_organization_lineage_names":["Oxford University Press","University of Oxford"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"European Heart Journal","raw_type":"journal-article"},"volume":null,"type":"article","is_traditional":true,"indexed_in":["crossref"],"open_access":{"is_oa":true,"oa_status":"bronze","oa_url":"https://academic.oup.com/eurheartj/article-pdf/47/Supplement_1/ehag785.758/72477116/ehag785.758.pdf","any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5159517013","display_name":"M Zuhair","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I47508984","display_name":"Imperial College London","ror":"https://ror.org/041kmwe10","country_code":"GB","type":"education","lineage":["https://openalex.org/I47508984"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"M Zuhair","raw_affiliation_strings":["Imperial College London , London ,"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Imperial College London , London ,","institution_ids":["https://openalex.org/I47508984"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5159504741","display_name":"N Kaza","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I47508984","display_name":"Imperial College London","ror":"https://ror.org/041kmwe10","country_code":"GB","type":"education","lineage":["https://openalex.org/I47508984"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"N Kaza","raw_affiliation_strings":["Imperial College London , London ,"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Imperial College London , London ,","institution_ids":["https://openalex.org/I47508984"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5159518146","display_name":"Z Liu","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I47508984","display_name":"Imperial College London","ror":"https://ror.org/041kmwe10","country_code":"GB","type":"education","lineage":["https://openalex.org/I47508984"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"Z Liu","raw_affiliation_strings":["Imperial College London , London ,"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Imperial College London , London ,","institution_ids":["https://openalex.org/I47508984"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5159484604","display_name":"P Eardley","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I47508984","display_name":"Imperial College London","ror":"https://ror.org/041kmwe10","country_code":"GB","type":"education","lineage":["https://openalex.org/I47508984"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"P Eardley","raw_affiliation_strings":["Imperial College London , London ,"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Imperial College London , London ,","institution_ids":["https://openalex.org/I47508984"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5159516819","display_name":"A Ali","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I47508984","display_name":"Imperial College London","ror":"https://ror.org/041kmwe10","country_code":"GB","type":"education","lineage":["https://openalex.org/I47508984"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"A Ali","raw_affiliation_strings":["Imperial College London , London ,"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Imperial College London , London ,","institution_ids":["https://openalex.org/I47508984"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5075910485","display_name":"Michela Sorbini","orcid":"https://orcid.org/0000-0002-9539-0907","observed_orcids":["https://orcid.org/0000-0002-9539-0907"]},"institutions":[{"id":"https://openalex.org/I47508984","display_name":"Imperial College London","ror":"https://ror.org/041kmwe10","country_code":"GB","type":"education","lineage":["https://openalex.org/I47508984"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"M Sorbini","raw_affiliation_strings":["Imperial College London , London ,"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Imperial College London , London ,","institution_ids":["https://openalex.org/I47508984"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5159517180","display_name":"M Dani","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I47508984","display_name":"Imperial College London","ror":"https://ror.org/041kmwe10","country_code":"GB","type":"education","lineage":["https://openalex.org/I47508984"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"M Dani","raw_affiliation_strings":["Imperial College London , London ,"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Imperial College London , London ,","institution_ids":["https://openalex.org/I47508984"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5040963224","display_name":"P Kanagaratnam","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I47508984","display_name":"Imperial College London","ror":"https://ror.org/041kmwe10","country_code":"GB","type":"education","lineage":["https://openalex.org/I47508984"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"P Kanagaratnam","raw_affiliation_strings":["Imperial College London , London ,"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Imperial College London , London ,","institution_ids":["https://openalex.org/I47508984"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5159561281","display_name":"R Sutton","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I47508984","display_name":"Imperial College London","ror":"https://ror.org/041kmwe10","country_code":"GB","type":"education","lineage":["https://openalex.org/I47508984"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"R Sutton","raw_affiliation_strings":["Imperial College London , London ,"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Imperial College London , London ,","institution_ids":["https://openalex.org/I47508984"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5159531825","display_name":"R Khiani","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I47508984","display_name":"Imperial College London","ror":"https://ror.org/041kmwe10","country_code":"GB","type":"education","lineage":["https://openalex.org/I47508984"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"R Khiani","raw_affiliation_strings":["Imperial College London , London ,"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Imperial College London , London ,","institution_ids":["https://openalex.org/I47508984"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5159516898","display_name":"D P Francis","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I47508984","display_name":"Imperial College London","ror":"https://ror.org/041kmwe10","country_code":"GB","type":"education","lineage":["https://openalex.org/I47508984"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"D Francis","raw_affiliation_strings":["Imperial College London , London ,"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Imperial College London , London ,","institution_ids":["https://openalex.org/I47508984"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5113685075","display_name":"Z I Whinnett","orcid":"https://orcid.org/0000-0002-2775-5126","observed_orcids":["https://orcid.org/0000-0002-2775-5126"]},"institutions":[{"id":"https://openalex.org/I47508984","display_name":"Imperial College London","ror":"https://ror.org/041kmwe10","country_code":"GB","type":"education","lineage":["https://openalex.org/I47508984"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"Z Whinnett","raw_affiliation_strings":["Imperial College London , London ,"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Imperial College London , London ,","institution_ids":["https://openalex.org/I47508984"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5018896115","display_name":"Matthew James Shun-Shin","orcid":"https://orcid.org/0000-0002-1179-0867","observed_orcids":["https://orcid.org/0000-0002-1179-0867"]},"institutions":[{"id":"https://openalex.org/I47508984","display_name":"Imperial College London","ror":"https://ror.org/041kmwe10","country_code":"GB","type":"education","lineage":["https://openalex.org/I47508984"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"M Shun-Shin","raw_affiliation_strings":["Imperial College London , London ,"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Imperial College London , London ,","institution_ids":["https://openalex.org/I47508984"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5113685240","display_name":"Phang Boon Lim","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I47508984","display_name":"Imperial College London","ror":"https://ror.org/041kmwe10","country_code":"GB","type":"education","lineage":["https://openalex.org/I47508984"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"P B Lim","raw_affiliation_strings":["Imperial College London , London ,"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Imperial College London , London ,","institution_ids":["https://openalex.org/I47508984"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5086524763","display_name":"D.S. Keene","orcid":null,"observed_orcids":[]},"institutions":[{"id":"https://openalex.org/I47508984","display_name":"Imperial College London","ror":"https://ror.org/041kmwe10","country_code":"GB","type":"education","lineage":["https://openalex.org/I47508984"]}],"countries":["GB"],"is_corresponding":false,"raw_author_name":"D Keene","raw_affiliation_strings":["Imperial College London , London ,"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Imperial College London , London ,","institution_ids":["https://openalex.org/I47508984"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":[],"corresponding_institution_ids":["https://openalex.org/I47508984"],"apc_list":{"value":5240,"currency":"EUR","value_usd":5922},"apc_paid":null,"fwci":0.0,"has_fulltext":false,"cited_by_count":0,"citation_normalized_percentile":{"value":0.80625539,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":null,"biblio":{"volume":"47","issue":"Supplement_1","first_page":null,"last_page":null},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11950","display_name":"Cardiovascular Syncope and Autonomic Disorders","score":1.0,"subfield":{"id":"https://openalex.org/subfields/2705","display_name":"Cardiology and Cardiovascular Medicine"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},"topics":[{"id":"https://openalex.org/T11950","display_name":"Cardiovascular Syncope and Autonomic Disorders","score":1.0,"subfield":{"id":"https://openalex.org/subfields/2705","display_name":"Cardiology and Cardiovascular Medicine"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T10745","display_name":"Heart Rate Variability and Autonomic Control","score":0.0,"subfield":{"id":"https://openalex.org/subfields/2705","display_name":"Cardiology and Cardiovascular Medicine"},"field":{"id":"https://openalex.org/fields/27","display_name":"Medicine"},"domain":{"id":"https://openalex.org/domains/4","display_name":"Health Sciences"}},{"id":"https://openalex.org/T12580","display_name":"Vagus Nerve Stimulation Research","score":0.0,"subfield":{"id":"https://openalex.org/subfields/2808","display_name":"Neurology"},"field":{"id":"https://openalex.org/fields/28","display_name":"Neuroscience"},"domain":{"id":"https://openalex.org/domains/1","display_name":"Life Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/vasovagal-syncope","display_name":"vasovagal syncope","score":0.9990000128746033},{"id":"https://openalex.org/keywords/bioelectrical-impedance-analysis","display_name":"bioelectrical impedance analysis","score":0.8050000071525574},{"id":"https://openalex.org/keywords/autologous-blood-transfusion","display_name":"autologous blood transfusion","score":0.8529999852180481},{"id":"https://openalex.org/keywords/dose-response-relationship","display_name":"dose-response relationship","score":0.7139999866485596},{"id":"https://openalex.org/keywords/blood-pressure","display_name":"blood pressure","score":0.6079999804496765},{"id":"https://openalex.org/keywords/head-up-tilt-test","display_name":"head-up tilt","score":0.7739999890327454},{"id":"https://openalex.org/keywords/autonomic-nervous-system","display_name":"autonomic nervous system","score":0.5370000004768372},{"id":"https://openalex.org/keywords/splanchnic-circulation","display_name":"splanchnic circulation","score":0.6039999723434448},{"id":"https://openalex.org/keywords/transthoracic-impedance","display_name":"thoracic impedance","score":0.7950000166893005},{"id":"https://openalex.org/keywords/azygos-vein","display_name":"azygos vein","score":0.6259999871253967}],"concepts":[{"id":"https://openalex.org/C71924100","wikidata":"https://www.wikidata.org/wiki/Q11190","display_name":"Medicine","level":0,"score":0.9122999906539917},{"id":"https://openalex.org/C2775849017","wikidata":"https://www.wikidata.org/wiki/Q4121920","display_name":"Splanchnic","level":3,"score":0.7139000296592712},{"id":"https://openalex.org/C84393581","wikidata":"https://www.wikidata.org/wiki/Q82642","display_name":"Blood pressure","level":2,"score":0.590399980545044},{"id":"https://openalex.org/C42219234","wikidata":"https://www.wikidata.org/wiki/Q131130","display_name":"Anesthesia","level":1,"score":0.5888000130653381},{"id":"https://openalex.org/C125567185","wikidata":"https://www.wikidata.org/wiki/Q3267428","display_name":"Supine position","level":2,"score":0.5586000084877014},{"id":"https://openalex.org/C164705383","wikidata":"https://www.wikidata.org/wiki/Q10379","display_name":"Cardiology","level":1,"score":0.5425999760627747},{"id":"https://openalex.org/C2780661788","wikidata":"https://www.wikidata.org/wiki/Q2795262","display_name":"Splanchnic nerves","level":3,"score":0.43309998512268066},{"id":"https://openalex.org/C126322002","wikidata":"https://www.wikidata.org/wiki/Q11180","display_name":"Internal medicine","level":1,"score":0.42570000886917114},{"id":"https://openalex.org/C178853913","wikidata":"https://www.wikidata.org/wiki/Q1642137","display_name":"Hemodynamics","level":2,"score":0.4020000100135803},{"id":"https://openalex.org/C2909144591","wikidata":"https://www.wikidata.org/wiki/Q4121920","display_name":"Splanchnic Circulation","level":4,"score":0.3978999853134155},{"id":"https://openalex.org/C47323905","wikidata":"https://www.wikidata.org/wiki/Q3506185","display_name":"Venous return curve","level":3,"score":0.392300009727478},{"id":"https://openalex.org/C72859922","wikidata":"https://www.wikidata.org/wiki/Q11068","display_name":"Circulatory system","level":2,"score":0.35040000081062317},{"id":"https://openalex.org/C24998067","wikidata":"https://www.wikidata.org/wiki/Q4114622","display_name":"Stimulation","level":2,"score":0.33570000529289246},{"id":"https://openalex.org/C2776452961","wikidata":"https://www.wikidata.org/wiki/Q1940733","display_name":"Mean arterial pressure","level":4,"score":0.3352000117301941},{"id":"https://openalex.org/C2776250893","wikidata":"https://www.wikidata.org/wiki/Q591137","display_name":"Azygos vein","level":2,"score":0.31540000438690186},{"id":"https://openalex.org/C2781312747","wikidata":"https://www.wikidata.org/wiki/Q2667159","display_name":"Vasovagal syncope","level":3,"score":0.30300000309944153},{"id":"https://openalex.org/C139940330","wikidata":"https://www.wikidata.org/wiki/Q596579","display_name":"Cardiac output","level":3,"score":0.3009999990463257},{"id":"https://openalex.org/C2775976690","wikidata":"https://www.wikidata.org/wiki/Q1660241","display_name":"Impedance cardiography","level":5,"score":0.2987000048160553},{"id":"https://openalex.org/C73787029","wikidata":"https://www.wikidata.org/wiki/Q7104929","display_name":"Orthostatic vital signs","level":3,"score":0.27959999442100525},{"id":"https://openalex.org/C2777953023","wikidata":"https://www.wikidata.org/wiki/Q1073121","display_name":"Heart rate","level":3,"score":0.2635999917984009},{"id":"https://openalex.org/C2992203999","wikidata":"https://www.wikidata.org/wiki/Q1940733","display_name":"Mean blood pressure","level":4,"score":0.25999999046325684},{"id":"https://openalex.org/C158846371","wikidata":"https://www.wikidata.org/wiki/Q1642137","display_name":"Blood flow","level":2,"score":0.2533999979496002},{"id":"https://openalex.org/C2780813298","wikidata":"https://www.wikidata.org/wiki/Q2071287","display_name":"Percutaneous","level":2,"score":0.25209999084472656}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1093/eurheartj/ehag785.758","doi":"https://doi.org/10.1093/eurheartj/ehag785.758","is_oa":true,"landing_page_url":"https://doi.org/10.1093/eurheartj/ehag785.758","pdf_url":"https://academic.oup.com/eurheartj/article-pdf/47/Supplement_1/ehag785.758/72477116/ehag785.758.pdf","source":{"id":"https://openalex.org/S181568219","display_name":"European Heart Journal","issn_l":"0195-668X","issn":["0195-668X","1522-9645"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-a","doyens","jufo-3","ki-jl-3","medline","norway-2","poland-200","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310311648","host_organization_name":"Oxford University Press","host_organization_lineage":["https://openalex.org/P4310311648","https://openalex.org/P4310311647"],"host_organization_lineage_names":["Oxford University Press","University of Oxford"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"European Heart Journal","raw_type":"journal-article"}],"best_oa_location":{"id":"doi:10.1093/eurheartj/ehag785.758","doi":"https://doi.org/10.1093/eurheartj/ehag785.758","is_oa":true,"landing_page_url":"https://doi.org/10.1093/eurheartj/ehag785.758","pdf_url":"https://academic.oup.com/eurheartj/article-pdf/47/Supplement_1/ehag785.758/72477116/ehag785.758.pdf","source":{"id":"https://openalex.org/S181568219","display_name":"European Heart Journal","issn_l":"0195-668X","issn":["0195-668X","1522-9645"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-a","doyens","jufo-3","ki-jl-3","medline","norway-2","poland-200","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310311648","host_organization_name":"Oxford University Press","host_organization_lineage":["https://openalex.org/P4310311648","https://openalex.org/P4310311647"],"host_organization_lineage_names":["Oxford University Press","University of Oxford"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"European Heart Journal","raw_type":"journal-article"},"sustainable_development_goals":[{"id":"https://metadata.un.org/sdg/3","display_name":"Good health and well-being","score":0.98580002784729}],"study_designs":[],"awards":[],"funders":[],"has_content":{"pdf":true,"grobid_xml":false},"content_urls":{"pdf":"https://content.openalex.org/works/W7223549321.pdf"},"referenced_works_count":0,"referenced_works":[],"related_works":["https://openalex.org/W7164152090","https://openalex.org/W4403487482","https://openalex.org/W2519283707","https://openalex.org/W2579460993","https://openalex.org/W2953942236","https://openalex.org/W2523297734","https://openalex.org/W1545833634","https://openalex.org/W2018819365","https://openalex.org/W2133924017","https://openalex.org/W2012630105"],"abstract_inverted_index":{"Abstract":[0],"Background":[1],"Vasovagal":[2],"syncope":[3,74,94,134,177],"(VVS)":[4],"is":[5,61,270],"the":[6,17,58,150,180],"most":[7],"common":[8],"cause":[9],"of":[10,13,104,280],"transient":[11],"loss":[12],"consciousness":[14],"(1),":[15],"yet":[16],"regional":[18],"fluid":[19,71],"dynamics":[20],"precipitating":[21],"events":[22],"remain":[23],"poorly":[24],"characterised.":[25],"Splanchnic":[26],"pooling":[27,218,276],"has":[28],"been":[29],"implicated":[30],"(2,3)":[31],"but":[32,57,209,277],"never":[33],"mapped":[34],"continuously":[35],"alongside":[36],"other":[37],"compartments.":[38],"Greater":[39],"splanchnic":[40,54,190,204,217,281,298],"nerve":[41],"(GSN)":[42],"stimulation":[43,79,140,230,264,290],"raises":[44],"blood":[45,86,160,169,237],"pressure":[46,113,161,170,238],"in":[47,189,226,235,284],"canine":[48],"models":[49],"(4)":[50],"and":[51,75,107,114,143],"during":[52,153],"human":[53],"activation":[55],"(5),":[56],"dose-response":[59,83],"relationship":[60],"undefined.":[62],"We":[63],"used":[64],"multi-segmental":[65],"bioelectrical":[66],"impedance":[67,191,205,212,223],"analysis":[68],"to":[69,80],"map":[70],"shifts":[72],"preceding":[73],"performed":[76],"graded":[77,136],"GSN":[78,139,229,289],"characterise":[81],"its":[82],"effect":[84],"on":[85],"pressure.":[87],"Methods":[88],"Ninety-three":[89],"adults":[90,132],"referred":[91],"for":[92],"unexplained":[93],"underwent":[95,135],"70\u00b0":[96],"head-up":[97],"tilt":[98],"testing":[99],"with":[100,110,157,194,219,257],"simultaneous":[101],"three-channel":[102],"BIA":[103],"thoracic,":[105],"splanchnic,":[106],"thigh":[108],"compartments,":[109],"beat-to-beat":[111],"arterial":[112],"ECG":[115],"monitoring.":[116,162],"Impedance":[117],"changes":[118],"were":[119],"expressed":[120],"as":[121,300],"percentage":[122],"change":[123,206],"from":[124],"supine":[125],"baseline.":[126],"In":[127,179],"a":[128,186,210,232,292,301],"separate":[129],"substudy,":[130],"two":[131],"without":[133],"percutaneous":[137],"transcatheter":[138],"(15,":[141],"20,":[142],"25":[144,254],"mA":[145,245,250,255],"at":[146,243,248,253],"20":[147,249],"Hz)":[148],"via":[149],"azygos":[151],"vein":[152],"elective":[154],"electrophysiology":[155],"procedures":[156],"continuous":[158],"invasive":[159],"Results":[163],"Fifty-six":[164],"(60%)":[165],"developed":[166],"syncope.":[167],"Systolic":[168],"diverged":[171],"between":[172],"groups":[173],"three":[174],"minutes":[175],"before":[176],"(p=0.02).":[178],"final":[181],"four":[182],"minutes,":[183],"non-fainters":[184],"showed":[185,202],"significant":[187],"rise":[188,213,234],"(+1.4\u00b10.3%,":[192],"p=0.001)":[193],"stable":[195],"thoracic":[196,211],"impedance,":[197],"indicating":[198,216],"splanchnic-to-central":[199],"autotransfusion.":[200],"Fainters":[201],"no":[203,258,266],"(\u22120.5\u00b10.4%,":[207],"p=0.09)":[208],"(+2.9\u00b10.3%,":[214],"p=0.02),":[215],"central":[220,285],"hypovolaemia.":[221],"Thigh":[222],"decreased":[224],"similarly":[225],"both":[227],"groups.":[228],"produced":[231,265],"dose-dependent":[233],"systolic":[236],"(baseline":[239],"130.5":[240],"mmHg;":[241],"135.4":[242],"15":[244],"[p=0.22];":[246],"138.5":[247],"[p=0.02];":[251],"136.8":[252],"[p=0.01]),":[256],"heart":[259],"rate":[260],"change.":[261],"IVC":[262],"control":[263],"effect.":[267],"Conclusions":[268],"VVS":[269],"distinguished":[271],"not":[272],"by":[273,278],"excessive":[274],"lower-limb":[275],"failure":[279],"autotransfusion,":[282],"resulting":[283],"volume":[286],"depletion.":[287],"Graded":[288],"elicits":[291],"dose-dependent,":[293],"heart-rate-independent":[294],"pressor":[295],"response,":[296],"establishing":[297],"neuromodulation":[299],"mechanism-targeted":[302],"therapeutic":[303],"strategy.":[304]},"counts_by_year":[],"updated_date":"2026-10-27T15:51:10.671819","created_date":"2026-10-26T00:00:00"}
