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dc.contributor.authorSorrell, Vincent
dc.contributor.authorPaleru, Vijayasree
dc.contributor.authorAltbach, Maria
dc.contributor.authorHilwig, Ronald
dc.contributor.authorKern, Karl
dc.contributor.authorGaballa, Mohamed
dc.contributor.authorEwy, Gordon
dc.contributor.authorBerg, Robert
dc.date.accessioned2016-05-20T09:00:24Z
dc.date.available2016-05-20T09:00:24Z
dc.date.issued2011en
dc.identifier.citationSorrell et al. Journal of Cardiovascular Magnetic Resonance 2011, 13:17 http://www.jcmr-online.com/content/13/1/17en
dc.identifier.doi10.1186/1532-429X-13-17en
dc.identifier.urihttp://hdl.handle.net/10150/610178
dc.description.abstractBACKGROUND:'Stone heart' resulting from ischemic contracture of the myocardium, precludes successful resuscitation from ventricular fibrillation (VF). We hypothesized that mild hypothermia might slow the progression to stone heart.METHODS:Fourteen swine (27 +/- 1 kg) were randomized to normothermia (group I
dc.description.abstractn = 6) or hypothermia groups (group II
dc.description.abstractn = 8). Mild hypothermia (34 +/- 2degreesC) was induced with ice packs prior to VF induction. The LV and right ventricular (RV) cross-sectional areas were followed by cardiovascular magnetic resonance until the development of stone heart. A commercial 1.5T GE Signa NV-CV/i scanner was used. Complete anatomic coverage of the heart was acquired using a steady-state free precession (SSFP) pulse sequence gated at baseline prior to VF onset. Un-gated SSFP images were obtained serially after VF induction. The ventricular endocardium was manually traced and LV and RV volumes were calculated at each time point.RESULTS:In group I, the LV was dilated compared to baseline at 5 minutes after VF and this remained for 20 minutes. Stone heart, arbitrarily defined as LV volume <1/3 of baseline at the onset of VF, occurred at 29 +/- 3 minutes. In group II, there was less early dilation of the LV (p < 0.05) and the development of stone heart was delayed to 52 +/- 4 minutes after onset of VF (P < 0.001).CONCLUSIONS:In this closed-chest swine model of prolonged untreated VF, hypothermia reduced the early LV dilatation and importantly, delayed the onset of stone heart thereby extending a known, morphologic limit of resuscitability.
dc.language.isoenen
dc.publisherBioMed Centralen
dc.relation.urlhttp://www.jcmr-online.com/content/13/1/17en
dc.rights© 2011 Sorrell et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0)en
dc.titleMild hypothermia delays the development of stone heart from untreated sustained ventricular fibrillation - a cardiovascular magnetic resonance studyen
dc.typeArticleen
dc.identifier.eissn1532-429Xen
dc.contributor.departmentDepartment of Medicine, Sarver Heart Center, University of Arizona College of Medicine, Tucson, Arizona, USAen
dc.contributor.departmentDepartment of Radiology, University of Arizona College of Medicine, Tucson, Arizona, USAen
dc.contributor.departmentDepartment of Pediatrics, Steel Memorial Children Research Center, University of Arizona College of Medicine, Tucson, Arizona, USAen
dc.identifier.journalJournal of Cardiovascular Magnetic Resonanceen
dc.description.collectioninformationThis item is part of the UA Faculty Publications collection. For more information this item or other items in the UA Campus Repository, contact the University of Arizona Libraries at repository@u.library.arizona.edu.en
dc.eprint.versionFinal published versionen
refterms.dateFOA2018-06-06T02:54:04Z
html.description.abstractBACKGROUND:'Stone heart' resulting from ischemic contracture of the myocardium, precludes successful resuscitation from ventricular fibrillation (VF). We hypothesized that mild hypothermia might slow the progression to stone heart.METHODS:Fourteen swine (27 +/- 1 kg) were randomized to normothermia (group I
html.description.abstractn = 6) or hypothermia groups (group II
html.description.abstractn = 8). Mild hypothermia (34 +/- 2degreesC) was induced with ice packs prior to VF induction. The LV and right ventricular (RV) cross-sectional areas were followed by cardiovascular magnetic resonance until the development of stone heart. A commercial 1.5T GE Signa NV-CV/i scanner was used. Complete anatomic coverage of the heart was acquired using a steady-state free precession (SSFP) pulse sequence gated at baseline prior to VF onset. Un-gated SSFP images were obtained serially after VF induction. The ventricular endocardium was manually traced and LV and RV volumes were calculated at each time point.RESULTS:In group I, the LV was dilated compared to baseline at 5 minutes after VF and this remained for 20 minutes. Stone heart, arbitrarily defined as LV volume <1/3 of baseline at the onset of VF, occurred at 29 +/- 3 minutes. In group II, there was less early dilation of the LV (p < 0.05) and the development of stone heart was delayed to 52 +/- 4 minutes after onset of VF (P < 0.001).CONCLUSIONS:In this closed-chest swine model of prolonged untreated VF, hypothermia reduced the early LV dilatation and importantly, delayed the onset of stone heart thereby extending a known, morphologic limit of resuscitability.


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