Zusammenfassung
Die einseitige Spinalanästhesie ist ein kostengünstiges und schnell durchführbares Verfahren. Sie beschränkt sich auf die sensiblen, motorischen und sympathischen Nervenfasern einer Körperseite. Hierdurch können einige für die beidseitige Spinalanästhesie typische Komplikationen umgangen werden. Gerade aufgrund der Vermeidung von Hypotensionen eignet sich das einseitige Verfahren auch für Patienten mit kardiovaskulären Risikofaktoren (z. B. Aortenklappenstenose, koronare Herzkrankheit). Für die zuletzt stark ansteigende Zahl ambulant durchgeführter Operationen galt die Spinalanästhesie bislang als wenig geeignet, da mit verzögerter Entlassung aufgrund prolongierter motorischer Blockade oder Harnverhalt gerechnet werden musste. Die einseitige Spinalanästhesie erlaubt jedoch nicht nur eine raschere Mobilisation der Patienten, sondern geht auch mit einer sehr niedrigen Inzidenz von Miktionsstörungen einher, sodass die Patienten oft sogar früher entlassen werden können als nach einer Allgemeinanästhesie. Der Erfolg dieser Technik wird jedoch durch zahlreiche Faktoren beeinflusst. Neben Konzentration, Barizität und Dosierung des Lokalanästhetikums sind Spinalnadeltyp und Injektionsflussrate ebenso entscheidende Parameter wie die Patientenlagerung. Es stehen verschiedene Adjuvanzien zur Verfügung, mit denen eine längere und intensivere Blockade erzielt werden kann. Nach Auswertung der verfügbaren Literatur zur einseitigen Spinalanästhesie (impact factor > 1) formuliert diese Übersichtsarbeit eine optimierte Vorgehensweise: Um eine tatsächlich einseitige Spinalanästhesie zu erreichen sollte hyperbares Bupivacain 0,5 % mit einer Injektionsflussrate ≤ 0,33 ml/min injiziert werden. Während und 20 min nach Injektion müssen die Patienten mit vollständig gebeugten Beinen und anteflektierter Wirbelsäule auf der zu operierenden Körperseite liegen. Die intrathekale Applikation von 1 ml hyperbarem Bupivacain 0,5 % (5 mg) resultiert in einer einstündigen, bis etwa zum Rückenmarksegment Th12 reichenden Blockade; die Gabe von 1,5 bis 2,0 ml hyperbarem Bupivacain 0,5 % (7,5–10 mg) bis etwa Th6. Zur Verlängerung der Blockadedauer auf 2 bis 3 h wird Clonidin (0,5–1 µg/kgKG) adjuvant injiziert. Während der anschließenden Fixierungszeit kann durch Kopf-Tief- bzw. -Hochlagerung die kraniale Ausbreitung der Spinalanästhesie beeinflusst werden.
Abstract
Unilateral spinal anesthesia is a cost-effective and rapidly performed anesthetic technique. An exclusively unilateral block only affects the sensory, motor and sympathetic functions on one side of the body and offers the advantages of a spinal block without the typical adverse side effects seen with a bilateral block. The lack of hypotension, in particular, makes unilateral spinal anesthesia suitable for patients with cardiovascular risk factors e. g. aortic valve stenosis or coronary artery disease. Increasing numbers of surgical procedures are now being performed on an outpatient basis. Until now, spinal anesthesia has been considered unsuitable for this, not only because of the high incidence of intraoperative hypotension and postoperative urinary retention but also because of the prolonged postoperative stay before home discharge. This is not the case with unilateral spinal anesthesia: motor function returns rapidly, the incidence of urinary retention is extremely low, and patients are usually eligible for home discharge sooner than after bilateral spinal anesthesia or general anesthesia. The success of the technique depends on a number of factors. In addition to the local anesthetic, its concentration and dose, and the baricity of the injected solution, the shape of the spinal needle, the injection speed, the patient’s position during injection, and the time the patient remains in this position after injection are equally important parameters. A number of intrathecally applied adjuvant drugs are used to give a more intense and/or longer-lasting block. For this review, we collated the published data on unilateral spinal anesthesia from journals with an impact factor greater than 1.0 and defined an optimized method for performing the technique. In order to achieve an exclusively unilateral block one should use 0.5 % hyperbaric bupivacaine injected at a rate of 0.33 ml/min or slower. During the injection and the following 20 min the patient should lie in the lateral decubitus position on the side intended for surgery with knees drawn to the chest. An injection of 5 mg (1 ml) hyperbaric bupivacaine 0.5 % provides an hour-long block to T 12, and a dose of 7.5 to 10 mg (1.5–2.0 ml) extends the block to T 6. Adding clonidine (0.5 to 1.0 µg/kg BW) to the injection prolongs the duration of the block to approximately two to three hours. During the 20-minute fixation period, the cephalad spread of the block can be influenced to a certain extent by raising or lowering the head of the table.
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B. Büttner, A. Mansur, M. Bauer, J. Hinz und I. Bergmann geben an, dass kein Interessenkonflikt besteht.
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Büttner, B., Mansur, A., Bauer, M. et al. Einseitige Spinalanästhesie. Anaesthesist 65, 847–865 (2016). https://doi.org/10.1007/s00101-016-0232-x
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DOI: https://doi.org/10.1007/s00101-016-0232-x