Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference
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Conf Proc IEEE Eng Med Biol Soc · Jan 2010
A novel continuous cardiac output monitor based on pulse wave transit time.
Monitoring cardiac output (CO) is important for the management of patient circulation in an operation room (OR) or intensive care unit (ICU). We assumed that the change in pulse wave transit time (PWTT) obtained from an electrocardiogram (ECG) and a pulse oximeter wave is correlated with the change in stroke volume (SV), from which CO is derived. The present study reports the verification of this hypothesis using a hemodynamic analysis theory and animal study. ⋯ Animal study was performed to verify the above-mentioned assumption. The correlation coefficient of PWTT and SV became r = -0.710 (p 〈 0.001), and a good correlation was admitted. It has been confirmed that accurate continuous CO and SV measurement is only possible by monitoring regular clinical parameters (ECG, SpO2, and NIBP).
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Conf Proc IEEE Eng Med Biol Soc · Jan 2010
Intraoperative multichannel audio-visual information recording and automatic surgical phase and incident detection.
Identification, analysis, and treatment of potential risk in surgical workflow are the key to decrease medical errors in operating room. For the automatic analysis of recorded surgical information, this study reports multichannel audio visual recording system, and its review and analysis system. ⋯ Conversation among surgical staff is quantified using fast Fourier transformation and frequency filter without speech recognition. The results suggested the progression phase of surgical procedure.
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Conf Proc IEEE Eng Med Biol Soc · Jan 2010
In vitro kinematic measurements of the patellar tendon in two different types of posterior-stabilized total knee arthroplasties.
Fixed-bearing posterior-stabilized (PS) total knee arthroplasty (TKA) has been used in Asian countries for several years, but few studies have investigated differences in the kinematic properties of the patellar tendon after standard PS TKA as compared to high-flex PS TKA. ⋯ We believe the changes observed in the sagittal plane and coronal plane angles of the patellar tendon after PS TKAs may influence the extensor mechanism and be an important cause of patella-femoral complications. These data may be used to assess patella-femoral complications after surgery so as to improve the design of high-flexion TKAs for Asians and achieve long-term stability.
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Conf Proc IEEE Eng Med Biol Soc · Jan 2010
Evaluation of monitoring cardiac output by long time interval analysis of a radial arterial blood pressure waveform using the MIMIC II database.
We recently proposed a technique to estimate relative cardiac output (CO) change by unique long time interval analysis (LTIA) of a radial arterial blood pressure waveform. Here, we evaluated the technique in 169 critically ill patients, while comparing it to previous "pulse contour analysis" techniques, using the public MIMIC II database. ⋯ However, the average absolute thermodilution CO change in each patient was only 12.3%. As the absolute CO change increased, the LTIA technique became increasingly more accurate than the previous techniques.
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Conf Proc IEEE Eng Med Biol Soc · Jan 2010
Towards improved sedation control in critically ill patients.
Patients in intensive care units are often prescribed a combination of sedative and analgesic to manage anxiety and pain relief. Proper sedation management is crucial to patient recovery but few intensive care units routinely employ strategies that tailor drug delivery to ongoing patient needs. The Infuse-Rite has been developed to automate a protocol that eliminates the possibility of excessive sedation. Changing clinical demands have provided the impetus for ongoing enhancements to improve the sedation control of patients in intensive care.