Continuous versus intermittent warm blood cardioplegia: Functional and energetics changes
Identifieur interne : 000A15 ( Istex/Curation ); précédent : 000A14; suivant : 000A16Continuous versus intermittent warm blood cardioplegia: Functional and energetics changes
Auteurs : Lucia Torracca [Italie] ; Evasio Pasini [Italie] ; Salvatore Curello [Italie] ; Claudio Ceconi [Italie] ; Giuseppe Coletti [Italie] ; Ottavio Alfieri [Italie] ; Roberto Solfrini [Italie] ; Roberto Ferrari [Italie]Source :
- The Annals of Thoracic Surgery [ 0003-4975 ] ; 1996.
Abstract
Background.The aim of this study was to compare the protective effects of continuous warm blood cardioplegia (CWBC) and intermittent warm blood cardioplegia (IWBC) in an experimental model of blood-perfused, isolated rabbit heart.Methods.In the CWBC group, cardiac arrest was induced by continuous infusion of blood cardioplegia (10 mEq/L KCI) followed by 30 minutes of reperfusion with blood. In the IWBC group, after 5 minutes of perfusion with blood cardioplegia (10 mEq/L KCl), coronary flow was abolished for 10 minutes, followed by reperfusion with blood cardioplegia for 5 minutes. This sequence was repeated three times for a total period of 45 minutes. Finally the hearts were reperfused for 30 minutes with blood.Results.Infusion of potassium induced a marked increase in coronary perfusion pressure (from 50 ± 3 to 98 ± 1 mm Hg; p < 0.01), which remained elevated throughout in the CWBC group, whereas in the IWBC group, it dropped to 0 during each no-flow period. In both groups, cardioplegia resulted in a significant reduction in oxygen consumption (from 5.5 ± 0.2 to 0.6 ± 0.03 mL O2 · min−1 · 100 g−1 wet wt; p < 0.01). During CWBC, glucose extraction was significantly reduced (from 152 ± 10 to 64 ± 18 μg · min−1 · g−1 wet wt; p < 0.01). Free fatty acid uptake and creatine kinase and lactate release were not affected. During IWBC, in contrast, a transient but significant release of creatine kinase (from 643 ± 254 to 2,234 ± 296 mU · min−1 · g−1 wet wt; p < 0.01) and lactate (from 63 ± 22 to 374 ± 32 μg · min−1 wet wt; p < 0.01) occurred after each period of ischemia. Despite these metabolic differences, both cardioplegic procedures allowed a prompt and complete recovery of mechanical function and tissue content of high-energy phosphates.Conclusions.Both CWBC and IWBC exert optimal protection in the isolated blood perfused rabbit heart. Thus, IWBC can be safely used to improve visualization of the surgical field.
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DOI: 10.1016/0003-4975(96)00598-X
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<wicri:regionArea>Divisione di Cardiochirurgia, Spedali Civili</wicri:regionArea>
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<affiliation wicri:level="1"><mods:affiliation>Salvatore Maugeri Foundation, IRCCS, Cardiovascular Pathophysiology Research Centre, Gussago, Italy</mods:affiliation>
<country xml:lang="fr">Italie</country>
<wicri:regionArea>Salvatore Maugeri Foundation, IRCCS, Cardiovascular Pathophysiology Research Centre, Gussago</wicri:regionArea>
</affiliation>
<affiliation wicri:level="1"><mods:affiliation>Cattedra di Cardiologia, Università degli Studi di Brescia, Italy</mods:affiliation>
<country xml:lang="fr">Italie</country>
<wicri:regionArea>Cattedra di Cardiologia, Università degli Studi di Brescia</wicri:regionArea>
</affiliation>
<affiliation wicri:level="1"><mods:affiliation>Laboratorio Analisi, Opera Pia Paolo Richiedei, Gussago, Brescia, Italy</mods:affiliation>
<country xml:lang="fr">Italie</country>
<wicri:regionArea>Laboratorio Analisi, Opera Pia Paolo Richiedei, Gussago, Brescia</wicri:regionArea>
</affiliation>
</author>
<author><name sortKey="Ferrari, Roberto" sort="Ferrari, Roberto" uniqKey="Ferrari R" first="Roberto" last="Ferrari">Roberto Ferrari</name>
<affiliation wicri:level="1"><mods:affiliation>Divisione di Cardiochirurgia, Spedali Civili, Italy</mods:affiliation>
<country xml:lang="fr">Italie</country>
<wicri:regionArea>Divisione di Cardiochirurgia, Spedali Civili</wicri:regionArea>
</affiliation>
<affiliation wicri:level="1"><mods:affiliation>Salvatore Maugeri Foundation, IRCCS, Cardiovascular Pathophysiology Research Centre, Gussago, Italy</mods:affiliation>
<country xml:lang="fr">Italie</country>
<wicri:regionArea>Salvatore Maugeri Foundation, IRCCS, Cardiovascular Pathophysiology Research Centre, Gussago</wicri:regionArea>
</affiliation>
<affiliation wicri:level="1"><mods:affiliation>Cattedra di Cardiologia, Università degli Studi di Brescia, Italy</mods:affiliation>
<country xml:lang="fr">Italie</country>
<wicri:regionArea>Cattedra di Cardiologia, Università degli Studi di Brescia</wicri:regionArea>
</affiliation>
<affiliation wicri:level="1"><mods:affiliation>Laboratorio Analisi, Opera Pia Paolo Richiedei, Gussago, Brescia, Italy</mods:affiliation>
<country xml:lang="fr">Italie</country>
<wicri:regionArea>Laboratorio Analisi, Opera Pia Paolo Richiedei, Gussago, Brescia</wicri:regionArea>
</affiliation>
<affiliation wicri:level="1"><mods:affiliation>Address reprint requests to Dr Ferrari, Cattedra di Cardiologia, Università degli Studi di Brescia, c/o Spedali Civili, P.le Spedali Civili, 1, 25123 Brescia, Italy</mods:affiliation>
<country xml:lang="fr">Italie</country>
<wicri:regionArea>Address reprint requests to Dr Ferrari, Cattedra di Cardiologia, Università degli Studi di Brescia, c/o Spedali Civili, P.le Spedali Civili, 1, 25123 Brescia</wicri:regionArea>
</affiliation>
<affiliation wicri:level="1"><mods:affiliation>E-mail: ferrari@master.cci.unibs.it</mods:affiliation>
<country wicri:rule="url">Italie</country>
</affiliation>
</author>
</analytic>
<monogr></monogr>
<series><title level="j">The Annals of Thoracic Surgery</title>
<title level="j" type="abbrev">ATS</title>
<idno type="ISSN">0003-4975</idno>
<imprint><publisher>ELSEVIER</publisher>
<date type="published" when="1996">1996</date>
<biblScope unit="volume">62</biblScope>
<biblScope unit="issue">4</biblScope>
<biblScope unit="page" from="1172">1172</biblScope>
<biblScope unit="page" to="1179">1179</biblScope>
</imprint>
<idno type="ISSN">0003-4975</idno>
</series>
<idno type="istex">8C01E83916A3B4556425FCC51D981C54CB81E6D0</idno>
<idno type="DOI">10.1016/0003-4975(96)00598-X</idno>
<idno type="PII">0003-4975(96)00598-X</idno>
<idno type="ArticleID">9600598X</idno>
</biblStruct>
</sourceDesc>
<seriesStmt><idno type="ISSN">0003-4975</idno>
</seriesStmt>
</fileDesc>
<profileDesc><textClass></textClass>
<langUsage><language ident="en">en</language>
</langUsage>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">Background.The aim of this study was to compare the protective effects of continuous warm blood cardioplegia (CWBC) and intermittent warm blood cardioplegia (IWBC) in an experimental model of blood-perfused, isolated rabbit heart.Methods.In the CWBC group, cardiac arrest was induced by continuous infusion of blood cardioplegia (10 mEq/L KCI) followed by 30 minutes of reperfusion with blood. In the IWBC group, after 5 minutes of perfusion with blood cardioplegia (10 mEq/L KCl), coronary flow was abolished for 10 minutes, followed by reperfusion with blood cardioplegia for 5 minutes. This sequence was repeated three times for a total period of 45 minutes. Finally the hearts were reperfused for 30 minutes with blood.Results.Infusion of potassium induced a marked increase in coronary perfusion pressure (from 50 ± 3 to 98 ± 1 mm Hg; p < 0.01), which remained elevated throughout in the CWBC group, whereas in the IWBC group, it dropped to 0 during each no-flow period. In both groups, cardioplegia resulted in a significant reduction in oxygen consumption (from 5.5 ± 0.2 to 0.6 ± 0.03 mL O2 · min−1 · 100 g−1 wet wt; p < 0.01). During CWBC, glucose extraction was significantly reduced (from 152 ± 10 to 64 ± 18 μg · min−1 · g−1 wet wt; p < 0.01). Free fatty acid uptake and creatine kinase and lactate release were not affected. During IWBC, in contrast, a transient but significant release of creatine kinase (from 643 ± 254 to 2,234 ± 296 mU · min−1 · g−1 wet wt; p < 0.01) and lactate (from 63 ± 22 to 374 ± 32 μg · min−1 wet wt; p < 0.01) occurred after each period of ischemia. Despite these metabolic differences, both cardioplegic procedures allowed a prompt and complete recovery of mechanical function and tissue content of high-energy phosphates.Conclusions.Both CWBC and IWBC exert optimal protection in the isolated blood perfused rabbit heart. Thus, IWBC can be safely used to improve visualization of the surgical field.</div>
</front>
</TEI>
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