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Arterial mechanical impedance is a sensitive stress response monitor during general anesthesia

, : Arterial mechanical impedance is a sensitive stress response monitor during general anesthesia. Hiroshima Journal of Medical Sciences 58(4): 75-82

Arterial mechanical impedance is a characteristic of arterial dynamics that is determined by photoplethysmographic amplitude and direct arterial pressure, while mechanical impedance is indicated by stiffness, viscosity, and inertia. We compared the parameters of mechanical impedance and photoplethysmographic amplitude to estimate the magnitude of stress response in patients undergoing general anesthesia by measuring direct arterial pressure. After sedating each patient with propofol, photoplethysmographic amplitude and mechanical impedance were measured as baseline control values, then 3 min after fentanyl administration (2 microg kg(-1)), the parameters were measured again as post-fentanyl values. Thereafter, a direct laryngoscopy procedure was performed and post-laryngoscopy values for the parameters were determined. The magnitudes of response to each event were compared by using the ratio of the measurements from the preceding event. Then, comparisons of the magnitudes were performed after coordinating each response in the same direction. Our results showed that both stiffness and viscosity of mechanical impedance had greater variations than photoplethysmographic amplitude. In conclusion, we propose stiffness and viscosity derived from arterial mechanical impedance as sensitive parameters to monitor stress responses during general anesthesia.


PMID: 20349750

Other references

Bigornia, A.E., 1966: Coconut cadang-cadang incidence and replanting in the Philippines. Results of a survey of Philippine coconut plantations indicate the need for a national scale replanting programme for the rejuvenation of old plantations, under-planting, and replacement in diseased areas with selected types of coconut, together w...

Blann, A.; Bareford, D., 2004: Ethnic background is a determinant of average warfarin dose required to maintain the INR between 3.0 and 4.5. Journal of Thrombosis and Haemostasis 2(3): 525-526

Vodovozov, A.M.; Glotova, N.M., 1973: Simple method of decreasing intraocular pressure before cavitary operations on the eye as a preventive of vitreous prolapse. Oftalmologicheskii Zhurnal 28(7): 508-511

Potopal'skii A.I.; Tkachuk Z.Yu; Yashovskii V.I.; Pogrebnoi I.P., 1984: Nitrogen fixation in the rhizosphere of panicum miliaceum and prospects for its intensification. Associative N2 fixation is established in millet cv. Yantarnoe. It is considerably increased in line 8 by the method of genome modification.

Delendi, N.; Bramezza, M., 1957: So-called tumorlets. Il Friuli Medico 12(5): 931-945

Downes, S.J.; Handasyde, K.A.; Elgar, M.A., 1997: The use of corridors by mammals in fragmented Australian eucalypt forests. A replicated sampling programme was used to examine the use of roadside corridors as habitat by native mammals in NE Victoria, Australia. The procedure compared the abundance and diversity of mammals in remnant eucalypt (Eucalyptus radiata, E. vim...

Hoppe, J.; Rieke, E.; Wagner, K.G., 1978: Mechanism of activation of protein kinase i from rabbit skeletal muscle mapping of the cyclic amp site by spin labeled cyclic nucleotides. Binding of cyclic[c]AMP to protein kinase (type I) from rabbit skeletal muscle was investigated using spin-labeled cAMP derivatives. Different compounds were synthesized with the spin label attached by spacer chains of different length at differen...

Illmensee, K.; Mahowald, A.P., 1974: Transplantation of posterior polar plasm in drosophila induction of germ cells at the anterior pole of the egg. In Drosophila melanogaster the primordial germ cells are normally formed at the posterior tip of the egg during the preblastoderm stage. In order to determine whether the posterior polar plasm is capable of inducing the formation of primordial ger...

Peckham, V.C., 1991: Learning disabilities in long-term survivors of childhood cancer: concerns for parents and teachers. Today more and more children are surviving childhood diseases that had been fatal in a previous generation. Medical advances and technology allow most children with cancer to enjoy long-term survival and cure. Research studies now show that there...

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