Evaluation of the Linear Relationship Between Pulse Arrival Time and Blood Pressure in ICU Patients: Potential and Limitations

A variety of techniques based on the indirect measurement of blood pressure (BP) by Pulse Transit Time (PTT) have been explored over the past few years. Such an approach has the potential in providing continuous and non-invasive beat to beat blood pressure without the use of a cuff. Pulse Arrival Time (PAT) which includes the cardiac pre-ejection period has been proposed as a surrogate of PTT, however, the balance between its questioned accuracy and measurement simplicity has yet to be established. The present work assessed the degree of linear relationship between PAT and blood pressure on 96 h of continuous electrocardiography and invasive radial blood pressure waveforms in a group of 11 young ICU patients. Participants were selected according to strict exclusion criteria including no use of vasoactive medications and presence of clinical conditions associated with cardiovascular diseases. The average range of variation for diastolic BP was 60 to 79 mmHg while systolic BP varied between 123 and 158 mmHg in the study database. The overall Pearson correlation coefficient for systolic and diastolic blood pressure was −0.5 and −0.42, respectively, while the mean absolute error was 3.9 and 7.6 mmHg. It was concluded that the utilization of PAT for the continuous non-invasive blood pressure estimation is rather limited according to the experimental setup, nonetheless the correlation coefficient performed better when the range of variation of blood pressure was high over periods of 30 min suggesting that PAT has the potential to be used as indicator of changes relating to hypertensive or hypotensive episodes

Recommendations for Future Articles on Knowledge, Attitudes and Practices in IJMS

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Gnathostomosis, an emerging foodborne zoonotic disease in Acapulco, Mexico.

Between 1993 and 1997, 98 gnathostomosis cases were clinically identified in Acapulco, Mexico. Intermittent cutaneous migratory swellings were the commonest manifestation. Larvae were identified in 26 cases, while in 72, final diagnosis was made on the basis of epidemiologic data, food habits, and positive enzyme-linked immunosorbent assay and Western blot results

Control vectorial de la maquina de induccion.

Este artículo presenta las ventajas de los sistemas de control vectorial por campo orientado aplicados a las máquinas rotativas. La técnica de control vectorial indirecto es aplicada al modelo de la máquina de inducción para obtener un desacople del flujo y el par y así poder realizar un control a través de las corrientes de eje directo y cuadratura. Las pruebas realizadas sobre la máquina muestran la funcionalidad de la estrategia de control presentada ante variaciones en la velocidad y el torque en el eje de la máquina de inducción

Control vectorial de la máquina de inducción.

Este artículo presenta las ventajas de los sistemas de control vectorial por campo orientado aplicados a las máquinas rotativas. La técnica de control vectorial indirecto es aplicada al modelo de la máquina de inducción para obtener un desacople del flujo y el par y así poder realizar un control a través de las corrientes de eje directo y cuadratura. Las pruebas realizadas sobre la máquina muestran la funcionalidad de la estrategia de control presentada ante variaciones en la velocidad y el torque en el eje de la máquina de inducción

Control vectorial de la maquina de induccion.

Este artículo presenta las ventajas de los sistemas de control vectorial por campo orientado aplicados a las máquinas rotativas. La técnica de control vectorial indirecto es aplicada al modelo de la máquina de inducción para obtener un desacople del flujo y el par y así poder realizar un control a través de las corrientes de eje directo y cuadratura. Las pruebas realizadas sobre la máquina muestran la funcionalidad de la estrategia de control presentada ante variaciones en la velocidad y el torque en el eje de la máquina de inducción

Detection of Pathogenic Leptospires in Water and Soil in Areas Endemic to Leptospirosis in Nicaragua

In Nicaragua, there are ideal environmental conditions for leptospirosis. The objective of this investigation was to detect pathogenic and saprophytic leptospires in water and soil samples from leptospirosis-endemic areas in Nicaragua. Seventy-eight water and 42 soil samples were collected from houses and rivers close to confirmed human cases.Leptospiraspp was isolated in Ellinghausen-McCullough-Johnson-Harris (EMJH) culture medium with 5-fluororacil and positive samples were analyzed through PCR for theLipL32gene, specific for pathogenic leptospires (P1 clade). There were 73 positive cultures from 120 samples, however only six of these (5% of all collected samples) were confirmed to be pathogenic, based on the presence of theLipL32gene (P1 clade). Of these six pathogenic isolates, four were from Leon and two from Chinandega. Four pathogenic isolates were obtained from water and two from soil. This study proved the contamination of water and soil with pathogenic leptospires, which represents a potential risk for public health

Filtro activo hibrido para eliminación de armónicos a tensiones medias

Se analiza el proceso de diseño y la simulación de un esquema de filtro activo híbrido aplicable a tensiones medias sin necesitar de transformadores reductores para tal fin. Se muestra el desarrollo del método de compensación usado y los resultados obtenidos cuando se aplica en un sistema de conversión de alterna a continua basado en tiristores. El sistema se simula para diferentes niveles de tensión de alimentación