Revista del Cuerpo Médico Hospital Nacional Almanzor Aguinaga Asenjo, 2021
Objetivo: Determinar factores asociados a mortalidad en pacientes con enfermedad grave por SARS-C... more Objetivo: Determinar factores asociados a mortalidad en pacientes con enfermedad grave por SARS-CoV-2. Material y métodos: Estudio retrospectivo en pacientes mayores de 18 años hospitalizados por enfermedad grave (saturación periférica de Oxígeno < 93% o compromiso radiológico pulmonar > 30%) y prueba molecular positiva en hisopado nasofaríngeo; en el hospital Rebagliati entre marzo y mayo de 2020. Se revisó historia clínica electrónica, resultados de análisis (de laboratorio y radiológicos) al ingreso y tratamiento recibido. Se realizó estadística bivariada y multivariada utilizando regresión de cox. Resultados: Se incluyeron 337 pacientes, de los cuales 215 fallecieron (63.8%). Fueron de sexo masculino 72.1%, edad promedio 63.6 años (DS 15.3), tiempo de enfermedad 7.4 días, estancia hospitalaria 10.3 días y 48.8% ingresó a ventilación mecánica invasiva. El análisis multivariado encontró significancia en edad > 60 años (HR 1.76, IC95% 1.26-2.45), antecedente de diabetes me...
Over the last twenty years, there has been a growing interest in the design of tunable devices at... more Over the last twenty years, there has been a growing interest in the design of tunable devices at microwave frequencies by us- ing liquid crystals technology. In particular, the use of liquid crystals with high dielectric anisotropy allows manufacturing voltage-controlled devices to operate in a wide frequency range. In this work the frequency response of a liquid crystal band-pass filter with dual-mode microstrip structure has been studied in depth by using a simulation software tool. A reshap- ing of a conventional dual-mode square patch resonator bandpass filter with a square notch, studied in the literature, has been proposed with the goal of improving the filter performance. The main features achieved are a significant increase in the return loss of the filter and a narrowing of a 3-dB bandwidth. Specifically, a reduction in the filter bandwidth from 800 MHz to 600 MHz, which leads to a return loss increase from 6 dB to 12.5 dB, has been achieved. The filter centre frequency ca...
Journal of the American Medical Informatics Association : JAMIA, Jan 15, 2015
We show how the HL7 Virtual Medical Record (vMR) standard can be used to design and implement a d... more We show how the HL7 Virtual Medical Record (vMR) standard can be used to design and implement a data integrator (DI) component that collects patient information from heterogeneous sources and stores it into a personal health record, from which it can then retrieve data. Our working hypothesis is that the HL7 vMR standard in its release 1 version can properly capture the semantics needed to drive evidence-based clinical decision support systems. To achieve seamless communication between the personal health record and heterogeneous data consumers, we used a three-pronged approach. First, the choice of the HL7 vMR as a message model for all components accompanied by the use of medical vocabularies eases their semantic interoperability. Second, the DI follows a service-oriented approach to provide access to system components. Third, an XML database provides the data layer. Results The DI supports requirements of a guideline-based clinical decision support system implemented in two clini...
ABSTRACT In the last years, there has been an increasing interest in using liquid crystals for de... more ABSTRACT In the last years, there has been an increasing interest in using liquid crystals for designing tunable devices at microwave frequencies due to the anisotropy of the LC physical properties. In this paper, the design, simulation and characterization of a voltage-controlled bandpass filter based on LC technology is presented. A microstrip square patch resonator with a dual-mode operation is proposed as the bandpass filter because of the advantages of using dual-mode technology, specifically in size reduction. A filter central frequency variation from 4.54 GHz to 5.19 GHz is measured when an external AC voltage is applied, which means a relative tuning range of 13.4%.
IEEE-EMBS International Conference on Biomedical and Health Informatics (BHI), 2014
ABSTRACT MobiGuide is a distributed decision-support system (DSS) that provides decision support ... more ABSTRACT MobiGuide is a distributed decision-support system (DSS) that provides decision support for patients and physicians. Patients receive support using a light-weight Smartphone DSS linked to data arriving from wearable monitoring devices and physicians receive support via a web interface connected to a backend DSS that has access to an integrated personal health record (PHR) that stores hospital EMR data, monitoring data, and recommendations provided for the patient by the DSSs. The patient data model used by the PHR and by all the system components that interact in a service-oriented architecture is based on HL7&#39;s virtual medical record (vMR) model. We describe how we used and extended the vMR model to support communication between the system components for the complex workflow needed to support guidance of patients any time everywhere.
Revista del Cuerpo Médico Hospital Nacional Almanzor Aguinaga Asenjo, 2021
Objetivo: Determinar factores asociados a mortalidad en pacientes con enfermedad grave por SARS-C... more Objetivo: Determinar factores asociados a mortalidad en pacientes con enfermedad grave por SARS-CoV-2. Material y métodos: Estudio retrospectivo en pacientes mayores de 18 años hospitalizados por enfermedad grave (saturación periférica de Oxígeno < 93% o compromiso radiológico pulmonar > 30%) y prueba molecular positiva en hisopado nasofaríngeo; en el hospital Rebagliati entre marzo y mayo de 2020. Se revisó historia clínica electrónica, resultados de análisis (de laboratorio y radiológicos) al ingreso y tratamiento recibido. Se realizó estadística bivariada y multivariada utilizando regresión de cox. Resultados: Se incluyeron 337 pacientes, de los cuales 215 fallecieron (63.8%). Fueron de sexo masculino 72.1%, edad promedio 63.6 años (DS 15.3), tiempo de enfermedad 7.4 días, estancia hospitalaria 10.3 días y 48.8% ingresó a ventilación mecánica invasiva. El análisis multivariado encontró significancia en edad > 60 años (HR 1.76, IC95% 1.26-2.45), antecedente de diabetes me...
Over the last twenty years, there has been a growing interest in the design of tunable devices at... more Over the last twenty years, there has been a growing interest in the design of tunable devices at microwave frequencies by us- ing liquid crystals technology. In particular, the use of liquid crystals with high dielectric anisotropy allows manufacturing voltage-controlled devices to operate in a wide frequency range. In this work the frequency response of a liquid crystal band-pass filter with dual-mode microstrip structure has been studied in depth by using a simulation software tool. A reshap- ing of a conventional dual-mode square patch resonator bandpass filter with a square notch, studied in the literature, has been proposed with the goal of improving the filter performance. The main features achieved are a significant increase in the return loss of the filter and a narrowing of a 3-dB bandwidth. Specifically, a reduction in the filter bandwidth from 800 MHz to 600 MHz, which leads to a return loss increase from 6 dB to 12.5 dB, has been achieved. The filter centre frequency ca...
Journal of the American Medical Informatics Association : JAMIA, Jan 15, 2015
We show how the HL7 Virtual Medical Record (vMR) standard can be used to design and implement a d... more We show how the HL7 Virtual Medical Record (vMR) standard can be used to design and implement a data integrator (DI) component that collects patient information from heterogeneous sources and stores it into a personal health record, from which it can then retrieve data. Our working hypothesis is that the HL7 vMR standard in its release 1 version can properly capture the semantics needed to drive evidence-based clinical decision support systems. To achieve seamless communication between the personal health record and heterogeneous data consumers, we used a three-pronged approach. First, the choice of the HL7 vMR as a message model for all components accompanied by the use of medical vocabularies eases their semantic interoperability. Second, the DI follows a service-oriented approach to provide access to system components. Third, an XML database provides the data layer. Results The DI supports requirements of a guideline-based clinical decision support system implemented in two clini...
ABSTRACT In the last years, there has been an increasing interest in using liquid crystals for de... more ABSTRACT In the last years, there has been an increasing interest in using liquid crystals for designing tunable devices at microwave frequencies due to the anisotropy of the LC physical properties. In this paper, the design, simulation and characterization of a voltage-controlled bandpass filter based on LC technology is presented. A microstrip square patch resonator with a dual-mode operation is proposed as the bandpass filter because of the advantages of using dual-mode technology, specifically in size reduction. A filter central frequency variation from 4.54 GHz to 5.19 GHz is measured when an external AC voltage is applied, which means a relative tuning range of 13.4%.
IEEE-EMBS International Conference on Biomedical and Health Informatics (BHI), 2014
ABSTRACT MobiGuide is a distributed decision-support system (DSS) that provides decision support ... more ABSTRACT MobiGuide is a distributed decision-support system (DSS) that provides decision support for patients and physicians. Patients receive support using a light-weight Smartphone DSS linked to data arriving from wearable monitoring devices and physicians receive support via a web interface connected to a backend DSS that has access to an integrated personal health record (PHR) that stores hospital EMR data, monitoring data, and recommendations provided for the patient by the DSSs. The patient data model used by the PHR and by all the system components that interact in a service-oriented architecture is based on HL7&#39;s virtual medical record (vMR) model. We describe how we used and extended the vMR model to support communication between the system components for the complex workflow needed to support guidance of patients any time everywhere.
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Papers by Carlos Marcos