Blood Volume and Fluid Kinetics in Patients Undergoing Extracorporal Circulation
調査の概要
状態
詳細な説明
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.
研究の種類
入学 (実際)
連絡先と場所
研究場所
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Linkoeping、スウェーデン、581 85
- University Hospital, Thoracic operation ward
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参加基準
適格基準
就学可能な年齢
健康ボランティアの受け入れ
受講資格のある性別
サンプリング方法
調査対象母集団
説明
Inclusion Criteria:
- open heart surgery, with extracorporal circulation
- consent to participation
研究計画
研究はどのように設計されていますか?
デザインの詳細
コホートと介入
グループ/コホート |
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Cardiac surgery
Patients subjected to open cardiac surgery with the help of extracorporal circulation.
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この研究は何を測定していますか?
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Blood Volume
時間枠: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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二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Intracellular Edema
時間枠: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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その他の成果指標
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
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Fluid Extravasation
時間枠: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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協力者と研究者
捜査官
- 主任研究者:Joachim Zdolsek, MD, PhD、University Hospital, Linköping, Sweden
出版物と役立つリンク
研究記録日
主要日程の研究
研究開始
一次修了 (実際)
研究の完了 (実際)
試験登録日
最初に提出
QC基準を満たした最初の提出物
最初の投稿 (見積もり)
学習記録の更新
投稿された最後の更新 (見積もり)
QC基準を満たした最後の更新が送信されました
最終確認日
詳しくは
本研究に関する用語
キーワード
その他の研究ID番号
- BVECC
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Blood Volume, Extravasationの臨床試験
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