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A clinical evaluation of rapid automatic noninvasive blood pressure determination with the Ohmeda 2120 “return-to-flow” method (1991)

Block, Frank E. ; Fletcher, Mark V. ; Morris, Timothy J. ; [et al.]

Springer

Journal of clinical monitoring and computing 7 (1991), S. 241-244

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ISSN: 1573-2614

Keywords: Monitoring: blood pressure ; Measurement techniques: blood pressure ; Blood pressure: measurement monitoring

Source: Springer Online Journal Archives 1860-2000

Topics: Computer Science , Medicine

Notes: Abstract Most commercial noninvasive blood pressure devices use the oscillometric method for determination of blood pressure. The Ohmeda 2120 noninvasive blood pressure monitor uses the oscillometric technique, but it also includes a “Sys Stat” mode for rapid determination of systolic blood pressure up to ten times per minute. This Sys Stat mode uses the “return-to-flow” method, in which the pressure on an upper arm cuff decreases in small steps until a finger sensor detects the first pulse of blood. Data from 16 patients monitored with the Ohmeda 2120 unit and with an arterial cannula were analyzed. The line of regression was Sys Stat = 0.85 (arterial) + 9.49. The Ohmeda 2120 monitor tended to under-estimate the arterial pressure, particularly at higher pressures. Several factors could have contributed to this underestimation. Even so, the accuracy is sufficient for clinical use under most circumstances. More importantly, in an urgent situation, the Sys Stat mode can provide a reading of systolic blood pressure within seconds.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01619267

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Effects of phase separation on the mechanical properties of polystyrene/poly(vinyl methyl ether) blends (1991)

Kim, J. H. ; Karasz, Frank E. ; Malone, M. F.

Stamford, Conn. [u.a.] : Wiley-Blackwell

Polymer Engineering and Science 31 (1991), S. 981-987

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ISSN: 0032-3888

Keywords: Chemistry ; Chemical Engineering

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: The effects of phase separation temperature and time on the tensile, dynamic mechanical, and tear properties of blends of polystyrene and poly(vinyl methyl ether) were investigated after phase separation above their respective cloud points with specified temperature-annealing time protocols. The results are analyzed in terms of the phase connectivity, interfacial adhesion, and changes in the glass transition temperature.

Additional Material: 12 Ill.