Journal of neurosurgical anesthesiology
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J Neurosurg Anesthesiol · Jul 2013
The effect of pumpless extracorporeal CO2 removal on regional perfusion of the brain in experimental acute lung injury.
Lung-protective mechanical ventilation with low tidal volumes (V(T)) is often associated with hypercapnia (HC), which may be unacceptable in patients with brain injury. CO2 removal using a percutaneous extracorporeal lung assist (pECLA) enables normocapnia despite low V(T), but its effects on regional cerebral blood flow (rCBF) remain ambiguous. We hypothesized that reversal of HC by pECLA impairs rCBF in a porcine lung injury model. ⋯ In this animal model, mechanical ventilation with low V(T) was associated with HC and increased rCBF. CO2 removal by pECLA restored normocapnia, reduced rCBF to levels of normocapnia, but required a higher systemic blood flow for the perfusion of the pECLA device. If these results could be transferred to patients, extracorporeal CO2 removal might be an option for treatment of combined lung and brain injury in condition of a sufficient cardiac flow reserve.
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J Neurosurg Anesthesiol · Jul 2013
Effects of positive end expiratory pressure (PEEP) on intracranial and cerebral perfusion pressure in pediatric neurosurgical patients.
Positive end expiratory pressure (PEEP) improves oxygenation by optimizing alveolar recruitment and reducing intrapulmonary shunt. Unfortunately, PEEP can interfere with intracranial pressure (ICP) by increasing intrathoracic pressure. We hypothesized that the use of different PEEP levels could have an effect on intracranial and cerebral perfusion pressure (CPP), gas exchange, respiratory system mechanics, and hemodynamics in pediatric patients undergoing major neurosurgical procedures. ⋯ We describe cerebral hemodynamic responses to PEEP application in pediatrics. PEEP values up to 8 cm H2O seem to be safe in pediatric patients with intracranial neoplasm, and, in our opinion, PEEP should be applied immediately after surgery to restore lung recruitment.
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J Neurosurg Anesthesiol · Jul 2013
ReviewSupratentorial intracerebral hemorrhage: a review of the underlying pathophysiology and its relevance for multimodality neuromonitoring in neurointensive care.
Supratentorial intracerebral hemorrhage (ICH) is a devastating condition with high morbidity and mortality. There are currently no proven pharmacological therapies for ICH, and the role of surgery is controversial. In the neurointensive care setting, management currently focuses on optimization of systemic physiology to offer neuroprotection by maintenance of adequate cerebral perfusion and substrate delivery, using targets derived principally from traumatic brain injury. ⋯ Here, we review the developments in neuromonitoring and their application to ICH, highlighting the importance of multimodality neuromonitoring to comprehensively assess cerebral perfusion, oxygenation, and metabolic status as well as offer an extended window for the prevention, early detection, and treatment of secondary neuronal injury and complications such as hematoma expansion. Technical advances will likely lead to the development of noninvasive monitors that deliver continuous measurement of cerebral hemodynamics, oxygenation, and metabolism over multiple regions of interest simultaneously. A key future priority will be to provide high-quality robust evidence that multimodality monitoring-guided treatment can lead to improved outcome.
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J Neurosurg Anesthesiol · Jul 2013
Biphasic change of progenitor proliferation in dentate gyrus after single dose of isoflurane in young adult rats.
Isoflurane exposure causes improvement in long-term neurocognitive function in young adult rats; this is associated with an increase in dentate gyrus (DG) progenitor proliferation 4 days after anesthesia. However, the number of new neurons that were born from cells that incorporated bromodeoxyuridine (BrdU) 4 days after anesthesia is not affected by anesthesia. We tested the hypothesis that progenitor proliferation continues to increase past 4 days, which would imply the possibility that the number of new neurons after anesthesia could be increased if BrdU labeling occurred at a later time point. ⋯ Anesthesia-induced progenitor proliferation in the DG was not sustained 9 days after anesthesia. We interpret these results to signify that an anesthetic effect on neurogenesis likely does not play a critical role in the previously observed isoflurane-induced long-term improvement in neurocognitive function in 60-day old rats and that the transient increase in progenitor proliferation serves to replenish the pool of neural stem cells. The mechanism of anesthesia-induced improvement in cognition of young adult rats remains elusive.
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J Neurosurg Anesthesiol · Jul 2013
Cooperative patient general anesthesia (Co.Pa.Ge.A.): the new anesthetic technique for neurological monitoring of the "cooperative" patient during endovascular treatment of elective brain arteriovenous malformations with Onyx18.
An anesthetic technique, which allows for neurological monitoring as well as continuous and safe monitoring of the airways with orotracheal intubation (cooperative patient general anesthesia [Co.Pa.Ge.A.]) has been described in patients undergoing elective thromboendoarterectomy surgery. The aim of this paper is to evaluate the effectiveness and the safety of Co.Pa.Ge.A. during scheduled endovascular treatments of brain arteriovenous malformations with a polymeric embolization agent, Onyx18. ⋯ At the moment and to the best of our knowledge, this is the first report in the medical literature on this new anesthetic technique in interventional neuroradiology. Co.Pa.Ge.A. can be considered a safe, effective, and satisfactory technique characterized by hemodynamic stability and good control of the respiratory pattern, offering the possibility to perform real-time neurological monitoring and easy conversion to general anesthesia in case of intraprocedural complications or anesthetic necessity.