Zusammenfassung
Die venöse Sättigung ist ein physiologischer Parameter und ein wichtiges Maß zur Beurteilung des Verhältnisses zwischen Sauerstoffangebot und Sauerstoffverbrauch sowohl in der Intensivmedizin als auch im perioperativen Setting. Als physiologische Größe hat die gemischt-venöse Sättigung (SvO2) einen hohen Stellenwert in der Intensivmedizin erlangt. Aufgrund der hohen Invasivität der Bestimmung der SvO2 hat sich zur Abschätzung des Gleichgewichts zwischen Sauerstoffangebot und -verbrauch die zentralvenöse Sättigung (ScvO2) etabliert. Einen äquivalenten Ersatz bietet die ScvO2 im Vergleich zur SvO2 jedoch nicht, da Bereiche der unteren Körperhälfte, wie das Splanchnikusgebiet, nur unzureichend miterfasst werden. Allerdings wurde nachgewiesen, dass eine zielorientierte Therapie in der Intensivmedizin, allen voran im septischen sowie hämorrhagischen Schock, mit Hilfe der ScvO2 durchgeführt werden kann. Auch hat die ScvO2 prognostische Aussagekraft über Morbidität und Mortalität. Zu beachten ist hierbei, dass nicht nur niedrige, sondern auch erhöhte venöse Sättigungen mit einem schlechteren Outcome assoziiert sind. Neben der ScvO2 und der SvO2 gewinnt die venös-arterielle pCO2-Differenz (dCO2) zunehmend an Bedeutung. Bei kardiochirurgischen Patienten und bei Patienten mit Sepsis konnte gezeigt werden, dass eine erhöhte dCO2 mit einem schlechteren Outcome einhergeht. Jedoch sind weitere Studien notwendig, um eine Einbindung der dCO2 in den klinischen Alltag zu ermöglichen.
Abstract
Venous saturation is an important parameter to assess the ratio between oxygen delivery and oxygen consumption for both intensive care medicine and during perioperative care. Mixed venous saturation (SvO2) is the most reliable parameter in this setting. Due to the high invasiveness of measuring mixed venous saturation, the less invasive central venous saturation (ScvO2) has been entrenched for determining the balance of oxygen delivery and consumption. However, central venous saturation is inferior compared to mixed venous saturation as it does not cover the lower part of the body, including splanchnic perfusion. Nevertheless, studies have shown that central venous saturation is a reliable marker for goal-directed therapy in intensive care medicine, especially in patients with septic or hemorrhagic shock. Furthermore, central venous saturation has deep impact as a prognostic factor concerning morbidity and mortality. It has to be mentioned that not only decreased venous saturations but also elevated venous saturations are associated with poor outcome. Besides mixed venous and central venous saturation, intensivists and anesthesiologists focus on the central venous-arterial pCO2 difference (dCO2). An elevated dCO2 is associated with poor outcome in patients after cardiac surgery or patients with sepsis. Yet, further investigations have to be performed to implement the dCO2 as a reliable marker in daily routine.
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V. Mezger, F. Balzer, M. Habicher und M. Sander geben an, dass kein Interessenkonflikt besteht.
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Mezger, V., Balzer, F., Habicher, M. et al. Venöse Sättigung. Med Klin Intensivmed Notfmed 112, 492–498 (2017). https://doi.org/10.1007/s00063-016-0145-0
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DOI: https://doi.org/10.1007/s00063-016-0145-0
Schlüsselwörter
- Zentralvenöse Sättigung
- Gemischtvenöse Sättigung
- Zentralvenös-arterielle pCO2-Differenz
- Zielorientierte Therapie
- Sepsis