TAILIEUCHUNG - Ebook Critical care in neurology: Phần 2

The importance of basic hemodynamic monitoring of neurocritical patients comes from the goal of maintaining brain autoregulation. Brain autoregulation and other biological signals are the variables to be monitored by using biomedical sensors. | Basic Hemodynamic Monitoring of Neurocritical Patients 53 5. Basic Hemodynamic Monitoring of Neurocritical Patients Bassem Zarif Magdy Khalaf Nabil Kitchener The importance of basic hemodynamic monitoring of neurocritical patients comes from the goal of maintaining brain autoregulation. Brain autoregulation and other biological signals are the variables to be monitored by using biomedical sensors. Complications that may occur in neurocritical patients . sepsis dehydration post-cardiac arrest status make hemodynamic monitoring of greater importance. The goals of hemodynamic monitoring in neurocritical care units are to assess the magnitude of physiological derangements in critically ill patients and to institute measures to correct the imbalance. The following steps should be taken to reach these goals. Although our review of data may be helpful the attending physician should decide what to use and when to use it. Menu to work with for proper patient management 1. Pulse oximeter SpO2 is regarded as one of the most important advances in critical care monitoring. SpO2 provides a continuous non-invasive method to measure arterial oxygen saturation and should be used on every neurocritical patient. The absorption spectra of both 54 Critical Care in Neurology oxyhemoglobin and deoxyhemoglobin and the characteristics of pulsatile blood can thus be determined. SpO2 is accurate to within 2 for saturations 70 . SpO2 is widely used in monitoring patients who have a variety of neurological conditions Adams 1997 and calculations made from the processed signals provide estimates of the tissue or venous and arterial blood and provide an estimate of the amount of oxygenated hemoglobin and the percent saturation of hemoglobin by oxygen SaO2 which is not the same as the PaO2 partial pressure of oxygen in the blood Adams 1997 . The PaO2 and SaO2 measurements of oxygenation are related through the oxyhemoglobin dissociation curve. Importantly SpO2 is a measure of arterial .

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