Blood Volume and Fluid Kinetics in Patients Undergoing Extracorporal Circulation
Aperçu de l'étude
Statut
Les conditions
Description détaillée
In many clinical situations, such as extensive surgery, it is of value to determine blood volume and rate of fluid loss from the intravascular space, since hypo- and hypervolemia are combined with increased morbidity and mortality. In this study we which to use the large variations in hemoglobin during extracorporal to calculate both these variables.
Hemoglobin is measured every 5 minutes during one hour beginning shortly before start of the heart-lung machine. When the extracorporal circulation begins the hemoglobin decreases due to the quick mix and dilution of the priming fluid from the heart-lung machine with the patients blood.
From the amount of priming fluid and the fall of the hemoglobin, the blood volume can be calculated. If no further fluid is given the next 20 to 30 minutes, the hemoglobin concentration will in most cases increase as a result of the fluid loss from the vascular space. This increase in combination with the diureses can be used to calculate the intravascular fluid loss to the interstitium during surgery.
Sodium concentration will also be measured in parallel with the hemoglobin concentration.
The Sodium concentrations in combination with given and excreted (urine)Sodium can be used in a mass balance to calculate if intracellular edema is induced.
Type d'étude
Inscription (Réel)
Contacts et emplacements
Lieux d'étude
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Linkoeping, Suède, 581 85
- University Hospital, Thoracic operation ward
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Critères de participation
Critère d'éligibilité
Âges éligibles pour étudier
Accepte les volontaires sains
Sexes éligibles pour l'étude
Méthode d'échantillonnage
Population étudiée
La description
Inclusion Criteria:
- open heart surgery, with extracorporal circulation
- consent to participation
Plan d'étude
Comment l'étude est-elle conçue ?
Détails de conception
Cohortes et interventions
Groupe / Cohorte |
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Cardiac surgery
Patients subjected to open cardiac surgery with the help of extracorporal circulation.
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Que mesure l'étude ?
Principaux critères de jugement
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
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Blood Volume
Délai: 30 minutes after start of CPB
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volume kinetic technique: During start of cardio pulmonary by-pass a known amount of fluid will expand the blood volume and dilute the hemoglobin.
To achieve the blood volume prior to anesthesia a hemoglobin value before anesthesia and the last hemoglobin value before CPB are used to correct the blood volume calculation. In this way blood volume prior to anaesthesia can be calculated. |
30 minutes after start of CPB
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Mesures de résultats secondaires
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
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Intracellular Edema
Délai: 30 minutes after CPB
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Mass balance based on repeated Sodium concentration, fluid volume given, given and excreted Sodium. A positive value indicating intracellular fluid accumulation and a negative value indicating cell dehydration. This is the change that will occur during the first 30 min after start of cardio pulmonary bypass. |
30 minutes after CPB
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Autres mesures de résultats
Mesure des résultats |
Description de la mesure |
Délai |
|---|---|---|
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Fluid Extravasation
Délai: Two distribution half-times. Approximately 16 minutes.
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Rate of fluid transfer from the intravascular to the extravascular compartment during two distribution half-times.
Graph derived from the hemoglobin change during 20 to 30 minutes after start of cardio pulmonary by-pass.
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Two distribution half-times. Approximately 16 minutes.
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Collaborateurs et enquêteurs
Parrainer
Les enquêteurs
- Chercheur principal: Joachim Zdolsek, MD, PhD, University Hospital, Linköping, Sweden
Publications et liens utiles
Dates d'enregistrement des études
Dates principales de l'étude
Début de l'étude
Achèvement primaire (Réel)
Achèvement de l'étude (Réel)
Dates d'inscription aux études
Première soumission
Première soumission répondant aux critères de contrôle qualité
Première publication (Estimation)
Mises à jour des dossiers d'étude
Dernière mise à jour publiée (Estimation)
Dernière mise à jour soumise répondant aux critères de contrôle qualité
Dernière vérification
Plus d'information
Termes liés à cette étude
Mots clés
Autres numéros d'identification d'étude
- BVECC
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