Matches in SemOpenAlex for { <https://semopenalex.org/work/W923871411> ?p ?o ?g. }
Showing items 1 to 67 of
67
with 100 items per page.
- W923871411 abstract "At presyncopal levels of lower body negative pressure (LBNP), we have frequently observed electrocardiographic responses that may be due to changes in cardiac position and/or shape, but could be indicative of altered myocardial function. To further investigate this, we evaluated cardiac function using a nuclear imaging technique in 21 healthy subjects (17 men and 4 women) after 30 minutes of supine rest and near the end of a presyncopal-limited LBNP exposure (LBNP averaged 65 plus or minus 3 mmHg at injection). Cardiac first pass images were obtained with a Multi-Wire Gamma Camera following an intravenous bolus injection of 30-50 millicurries of Tantalum-178. Manual blood pressures and electrocardiograms were obtained throughout the 3 minute graded LBNP protocol. Between rest and injection during LBNP, heart rate increased (P less than 0.01) from 67 plus or minus 3 beats per minute to 99 plus or minus beats per minute, systolic blood pressure decreased (P less than 0.01) from 110 plus or minus 3 mmHg to 107 plus or minus 3 mmHg and left ventricular ejection fraction (EF) decreased (P less than 0.01) from 0.57 plus or minus 0.02 to 0.48 plus or minus 0.02. During LBNP, ST segment depression of at least 0.5 mm occurred in 7 subjects. Subjects with ST depression had greater reductions (P = 0.05) in EF than subjects without ST depression (0.15 plus or minus 0.07 versus 0.005 plus or minus 0.03), but also tolerated greater levels (P less than 0.05) of negative pressure (88 plus or minus mmHg versus 69 plus or minus 5 mmHg). There was a significant relationship between presyncopal LBNP level and EF (R(exp 2) = 0.50, P less than 0.05). Our findings suggest there may be a decrease in systolic myocardial function at high levels of LBNP." @default.
- W923871411 created "2016-06-24" @default.
- W923871411 creator A5025608840 @default.
- W923871411 creator A5029211974 @default.
- W923871411 creator A5072199240 @default.
- W923871411 creator A5076352062 @default.
- W923871411 date "1992-05-14" @default.
- W923871411 modified "2023-09-24" @default.
- W923871411 title "Changes in left ventricular function as determined by the multi-wire gamma camera at near presyncopal levels of lower body negative pressure" @default.
- W923871411 hasPublicationYear "1992" @default.
- W923871411 type Work @default.
- W923871411 sameAs 923871411 @default.
- W923871411 citedByCount "0" @default.
- W923871411 crossrefType "journal-article" @default.
- W923871411 hasAuthorship W923871411A5025608840 @default.
- W923871411 hasAuthorship W923871411A5029211974 @default.
- W923871411 hasAuthorship W923871411A5072199240 @default.
- W923871411 hasAuthorship W923871411A5076352062 @default.
- W923871411 hasConcept C111566952 @default.
- W923871411 hasConcept C125567185 @default.
- W923871411 hasConcept C126322002 @default.
- W923871411 hasConcept C139940330 @default.
- W923871411 hasConcept C164705383 @default.
- W923871411 hasConcept C2777953023 @default.
- W923871411 hasConcept C2778198053 @default.
- W923871411 hasConcept C43376680 @default.
- W923871411 hasConcept C71924100 @default.
- W923871411 hasConcept C78085059 @default.
- W923871411 hasConcept C84393581 @default.
- W923871411 hasConceptScore W923871411C111566952 @default.
- W923871411 hasConceptScore W923871411C125567185 @default.
- W923871411 hasConceptScore W923871411C126322002 @default.
- W923871411 hasConceptScore W923871411C139940330 @default.
- W923871411 hasConceptScore W923871411C164705383 @default.
- W923871411 hasConceptScore W923871411C2777953023 @default.
- W923871411 hasConceptScore W923871411C2778198053 @default.
- W923871411 hasConceptScore W923871411C43376680 @default.
- W923871411 hasConceptScore W923871411C71924100 @default.
- W923871411 hasConceptScore W923871411C78085059 @default.
- W923871411 hasConceptScore W923871411C84393581 @default.
- W923871411 hasLocation W9238714111 @default.
- W923871411 hasOpenAccess W923871411 @default.
- W923871411 hasPrimaryLocation W9238714111 @default.
- W923871411 hasRelatedWork W1675087609 @default.
- W923871411 hasRelatedWork W1967723907 @default.
- W923871411 hasRelatedWork W1972194317 @default.
- W923871411 hasRelatedWork W2006372603 @default.
- W923871411 hasRelatedWork W2052394470 @default.
- W923871411 hasRelatedWork W2083853758 @default.
- W923871411 hasRelatedWork W2150345731 @default.
- W923871411 hasRelatedWork W2369463904 @default.
- W923871411 hasRelatedWork W2370150042 @default.
- W923871411 hasRelatedWork W2403687388 @default.
- W923871411 hasRelatedWork W2406062203 @default.
- W923871411 hasRelatedWork W2408181715 @default.
- W923871411 hasRelatedWork W2412231019 @default.
- W923871411 hasRelatedWork W2412279405 @default.
- W923871411 hasRelatedWork W2440821456 @default.
- W923871411 hasRelatedWork W2474769559 @default.
- W923871411 hasRelatedWork W2811071725 @default.
- W923871411 hasRelatedWork W3140588206 @default.
- W923871411 hasRelatedWork W3145004678 @default.
- W923871411 hasRelatedWork W32014279 @default.
- W923871411 isParatext "false" @default.
- W923871411 isRetracted "false" @default.
- W923871411 magId "923871411" @default.
- W923871411 workType "article" @default.