Journal of anesthesia
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Journal of anesthesia · Feb 2017
Isoflurane decreases proliferation and differentiation, but none of the effects persist in human embryonic stem cell-derived neural progenitor cells.
Volatile anesthetics are a potential risk for cognitive impairment in the developing brain. Isoflurane causes cell death, reduces neurogenesis, and changes neuronal differentiation. In this study, the effects of a single isoflurane exposure on the developing human brain were evaluated using human embryonic stem cell (hESC)-derived neural progenitor cells (NPCs). ⋯ Exposing NPCs to isoflurane hampered proliferation and differentiation but not neuronal survival. Isoflurane may be a powerful neuronal modulator during the early developmental period, partly mediated by activation of p75NTR.
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Journal of anesthesia · Feb 2017
Analysis of actual pressure point using the power flexible capacitive sensor during chest compression.
In chest compression for cardiopulmonary resuscitation (CPR), the lower half of the sternum is pressed according to the American Heart Association (AHA) guidelines 2010. These have been no studies which identify the exact location of the applied by individual chest compressions. We developed a rubber power-flexible capacitive sensor that could measure the actual pressure point of chest compression in real time. ⋯ Average compression rate, average recoil, average depth, and average duty cycle were 108.6 counts per minute, 0.089, 4.5 cm, and 48.27 %, respectively. Many of the ambulance crews did not press on the sternal lower half definitely. This new device has the potential to improve the quality of CPR during training or in clinical practice.
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Journal of anesthesia · Feb 2017
Preventive effects of dexmedetomidine on the development of cognitive dysfunction following systemic inflammation in aged rats.
In the present study, we examined whether and by what mechanisms dexmedetomidine (DMED) prevents the development of systemic inflammation (SI)-induced cognitive dysfunction in aged rats. ⋯ Our findings highlight that treatment with DMED during, but not after, peripheral SI can prevent subsequent hippocampal neuroinflammation, overexpression of TLR-4 in microglia, and cognitive dysfunction, as mediated by the α2A-AR signaling pathway.
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Journal of anesthesia · Feb 2017
Assessment of dexmedetomidine effects on left ventricular function using pressure-volume loops in rats.
The role of dexmedetomidine on left ventricular function is ambiguous. We analyzed pressure-volume loops to investigate whether dexmedetomidine has a myocardial depressive effect. ⋯ Dexmedetomidine had no direct myocardial depressant effect in the rat heart in doses that are similar to those encountered under clinical conditions. Dexmedetomidine did not significantly alter the ability of the heart to cope with bradycardia and greatly increased afterload. Their potentially negative impact on cardiac output was effectively attenuated by improved myocardial contractility and preserved diastolic function in healthy subjects.