Masui. The Japanese journal of anesthesiology
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Case Reports
[Perioperative management of a case of myasthenic crisis with unexpected difficult airway].
Myasthenia gravis (MG) is an autoimmune disorder characterized by loss of acetylcholine receptors (AChR) due primarily to the production of anti-AChR autoantibodies. We report here a case of anesthetic management of MG patient associated with difficult airway. A 58-year-old woman, 150 cm in height and 43 kg in weight, was scheduled for elective thymectomy. ⋯ We used fiberscope intubation for her because it was difficult to intubate."Cannot intubate, cannot ventilate (CICV)" scenario is very rare, but it sometimes leads to serious morbidity and mortality. Therefore, we need to deal with this emergency situation by using a variety of equipments and techniques. Careful examination of the airway and a carefully considered plan for re-intubation are prerequisites for this type of surgery.
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Transesophageal echocardiography (TEE) is a useful tool for assessment of cardiac function in patients undergoing cardiac surgery or in patients undergoing non-cardiac surgery who have cardiovascular complications. Left ventricular (LV) function is composed of systolic function, diastolic function, preload and afterload. To assess systolic and diastolic function several methods are used, and we must use them based on the property of each parameter. ⋯ LV dP/dt is not affected by preload, and myocardial performance index (Tei index) can be used to assess both systolic and diastolic functions. Tei index is also useful to assess right ventricular function. The recently developed real time 3-dimensional system provides accurate and objective information, such as LV volumetry, wall motion, dyssyncrony and valvular pathology.
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Case Reports
[Multiple difficulties for central venous access required the distal femoral vein catheterization: a case report].
The low femoral approach for catheterization of the central venous line is a difficult procedure because the surface landmark technique is not helpful. We report a case of patient who required the distal femoral cannulation. Re-catheter cannulation was planned for the patient after the major cardiovascular surgery. ⋯ The right subclavian and right femoral regions were scarred with the surgical procedure. Finally, we performed the distal femoral cannulation using real time ultrasound guidance. When multiple difficulties for venous access are present, ultrasound-guided low approach of femoral vein might be one of the solutions.
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Pulse oximeter expressed by SpO2 is used for monitoring respiratory state during operation and in ICU. Perfusion index (PI) and pleth variability index (PVI) as new indexes are calculated from pulse oximeter (Masimo SET Radical-7, Masimo Corp., USA, 1998) waveforms. And these indices were used as parameters to evaluate the circulatory state. ⋯ It might thus be of future value in assessment of perioperative changes in peripheral perfusion. PVI is a measure of a dynamic change in PI that occurs during complete respiratory cycle. It might be thought that PVI, an index automatically derived from the pulse oximeter waveform analysis, had potentially clinical applications for noninvasive hypovolemia detection and fluid responsiveness monitoring.
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Noninvasive monitoring of regional cerebral oxygen saturation has been introduced in clinical settings for estimation of cerebral perfusion and cerebral blood flow. In this article, I have described several issues regarding the usefulness and clinical limitations associated with the use of these monitors, as well as relevant information on basic principles of monitoring. At present, there is not enough clinical data concerning critical levels of measured variables that are essential for safe perioperative management of patients susceptible for cerebral ischemia.