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- Ensayo clínico NCT01210417
Trauma Heart to Arm Time (THAT)
In the prehospital setting it would be helpful to assess primary changes in central blood volume or preload (venous return, stroke volume, diastolic ventricular volume) that occur during the stability phase following injury when regulatory mechanisms are still functioning.
Obviously in this setting a non invasive bedside beat-to-beat index would be helpful.
Pulse Transit Time (PTT) is the sum of Pre-Ejection Period (PEP), the time interval between the onset of ventricular depolarization and the ventricular ejection, and Vascular Transit Time (VTT), the time it takes for the pulse wave to travel from the aortic valve to the peripheral arteries (Obrist et al. 1979). PEP variations are known to correlate with reductions in central blood volume induced by head-up tilt (Chan et al., 2007b, 2008). The same authors also demonstrated that PTT variations follow closely PEP variations and therefore central blood volume variations (Chan et al., 2007b). Following central blood volume reductions induced by head-up tilting ventricular diastolic filling time increases involving an increase in PEP and PTT. Chan et al. (Chan et al., 2007b) concluded that PTT could have been used to assess early central hypovolemia and suggested that joint analysis of PTT and RR intervals could help in predicting the extent of blood volume loss. The investigators hypothesized that sympathetic drive associated with trauma would act on cardiac contractility through beta activity thus shortening PTT without reducing RR interval to the same extent in healthy hearts. We also hypothesized that progressive hypovolemia would lead to a rising of PTT (augmented diastolic filling time) and a RR interval shortening (relative tachycardia). In this study the investigators propose and index based on the beat-to-beat PTT/RR ratio to assess central hypovolemia in traumatic patients enrolled by our Helicopter Emergency Medical System (HEMS) in a prehospital setting.
Descripción general del estudio
Estado
Condiciones
Intervención / Tratamiento
Tipo de estudio
Inscripción (Actual)
Contactos y Ubicaciones
Ubicaciones de estudio
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Milano, Italia, 20100
- A.R.E.U. - A.A.T. 118 Milano
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Criterios de participación
Criterio de elegibilidad
Edades elegibles para estudiar
Acepta Voluntarios Saludables
Géneros elegibles para el estudio
Método de muestreo
Población de estudio
Descripción
Inclusion Criteria:
- all trauma victims enrolled by our Helicopter Emergency Medical System (HEMS)
Exclusion Criteria:
- need of immediate life-saving manoeuvres as decided by onboard physician following Prehospital Trauma Care (PTC) criteria (CITATION PTC)
- Cardiac arrest
- presence of preexisting chronic illnesses involving the autonomic nervous system such as hypertension, diabetes and any neurological disease
- any preexisting medical therapy including those administered by the emergency medical team as defined in point 1)
- presence of supraventricular ectopic beats more than 5% of total recorded beats
- absence of sinus rhythm
- presence of intraventricular or bundle branch blocks or artificial pacemaker
- spinal chord trauma above D2
- patient age <18 years
- presence of burns not allowing monitoring
Plan de estudios
¿Cómo está diseñado el estudio?
Detalles de diseño
- Modelos observacionales: Solo caso
- Perspectivas temporales: Futuro
Cohortes e Intervenciones
Grupo / Cohorte |
Intervención / Tratamiento |
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Trauma victims
All prehospital traumatic patients enrolled by our Helicopter Emergency Medical System (HEMS)
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Three-lead electrocardiogram (ECG), PPG oxymetry, non-invasive blood pressure (NIBP) are registered
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Colaboradores e Investigadores
Patrocinador
Fechas de registro del estudio
Fechas importantes del estudio
Inicio del estudio
Finalización del estudio (Actual)
Fechas de registro del estudio
Enviado por primera vez
Primero enviado que cumplió con los criterios de control de calidad
Publicado por primera vez (Estimar)
Actualizaciones de registros de estudio
Última actualización publicada (Estimar)
Última actualización enviada que cumplió con los criterios de control de calidad
Última verificación
Más información
Términos relacionados con este estudio
Palabras clave
Términos MeSH relevantes adicionales
Otros números de identificación del estudio
- 179_06/2010
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