Journal of Clinical Monitoring and Computing, 1991
We read with interest a study by Talke et al [1] regarding measurement of systolic blood pressure... more We read with interest a study by Talke et al [1] regarding measurement of systolic blood pressure using a pulse oximeter. We appreciate the fact that an oximeter can be successfully used to monitor systolic pressure in anesthetized patients and healthy volunteers. We have used it successfully, even in patients with "pulseless disease" [2].
The authors evaluated a thermodilution catheter designed to continuously measure cardiac output (... more The authors evaluated a thermodilution catheter designed to continuously measure cardiac output (CO). A 10 cm long surface heating element is positioned in a Swan-Ganz catheter corresponding to a right atrial-ventricular site. Heat is repetitively deposited into flowing blood in a unique, pseudorandom binary form. Small temperature fluctuations are sensed with a high performance thermistor and correlated with the heat input pattern, from which CO is determined. Seven adult sheep were anesthetized and instrumented for both continuous and standard cold bolus injection thermodilution (COM1) flow measurements. Heart rate and blood volume were adjusted to vary CO from 1.5 to 13.2 L/min. Continuous measurements correlated well with triplicate COM1 determinations (Sy,x = 0.56, r = 0.967) that improved with experience (Sy,x = 0.38, r = 0.99 for the last three animals). The surface heat transfer coefficient was measured in water (catheter parallel to flow). Results agreed well with a standard cylinder-in-crossflow correlation. The right ventricle heating element surface temperature was predicted for several CO and heating combinations. Worst case results yielded a 5.8 degrees C surface temperature elevation, suggesting that thermally induced damage is unlikely. Results suggest this catheter provides accuracy at least comparable to that of standard cold bolus injection methods, with no heat induced damage to blood.
Re: "Call for Proposals on IEEE Project 802.16e: Mobility Enhancements to IEEE Standard 802.16/80... more Re: "Call for Proposals on IEEE Project 802.16e: Mobility Enhancements to IEEE Standard 802.16/802.16a", IEEE 802.16e-03/02, 2003-01-16, and "Mobile System and Proposal Evaluation Requirements", IEEE 802.16e-03/01, 2003-01-16.
We present a new parallel algorithm for computing the optimum coefficients of the fractionally-sp... more We present a new parallel algorithm for computing the optimum coefficients of the fractionally-spaced FIR MMSE-DFE based on the Householder orthogonal transformation which avoids the back-substitution computational bottleneck in [1]. The resulting significant reductions in the algorithm's execution time are demonstrated through a real-time FPGA implementation.
Journal of Clinical Monitoring and Computing, 1991
We read with interest a study by Talke et al [1] regarding measurement of systolic blood pressure... more We read with interest a study by Talke et al [1] regarding measurement of systolic blood pressure using a pulse oximeter. We appreciate the fact that an oximeter can be successfully used to monitor systolic pressure in anesthetized patients and healthy volunteers. We have used it successfully, even in patients with "pulseless disease" [2].
The authors evaluated a thermodilution catheter designed to continuously measure cardiac output (... more The authors evaluated a thermodilution catheter designed to continuously measure cardiac output (CO). A 10 cm long surface heating element is positioned in a Swan-Ganz catheter corresponding to a right atrial-ventricular site. Heat is repetitively deposited into flowing blood in a unique, pseudorandom binary form. Small temperature fluctuations are sensed with a high performance thermistor and correlated with the heat input pattern, from which CO is determined. Seven adult sheep were anesthetized and instrumented for both continuous and standard cold bolus injection thermodilution (COM1) flow measurements. Heart rate and blood volume were adjusted to vary CO from 1.5 to 13.2 L/min. Continuous measurements correlated well with triplicate COM1 determinations (Sy,x = 0.56, r = 0.967) that improved with experience (Sy,x = 0.38, r = 0.99 for the last three animals). The surface heat transfer coefficient was measured in water (catheter parallel to flow). Results agreed well with a standard cylinder-in-crossflow correlation. The right ventricle heating element surface temperature was predicted for several CO and heating combinations. Worst case results yielded a 5.8 degrees C surface temperature elevation, suggesting that thermally induced damage is unlikely. Results suggest this catheter provides accuracy at least comparable to that of standard cold bolus injection methods, with no heat induced damage to blood.
Re: "Call for Proposals on IEEE Project 802.16e: Mobility Enhancements to IEEE Standard 802.16/80... more Re: "Call for Proposals on IEEE Project 802.16e: Mobility Enhancements to IEEE Standard 802.16/802.16a", IEEE 802.16e-03/02, 2003-01-16, and "Mobile System and Proposal Evaluation Requirements", IEEE 802.16e-03/01, 2003-01-16.
We present a new parallel algorithm for computing the optimum coefficients of the fractionally-sp... more We present a new parallel algorithm for computing the optimum coefficients of the fractionally-spaced FIR MMSE-DFE based on the Householder orthogonal transformation which avoids the back-substitution computational bottleneck in [1]. The resulting significant reductions in the algorithm's execution time are demonstrated through a real-time FPGA implementation.
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Papers by Russell McKown