Sistema para el estudio de la circulación venosa periférica por Fotopletismografía. Validación clínica preliminar / System for the study of the peripheral venous circulation by Fotopletismografía: preliminary clinical validation

El trabajo presenta un sistema destinado para el estudio de la circulación venosa periférica por Fotopletismografía que se adicionará al equipo médico ANGIODIN PD 3000. El mismo permite calcular el Tiempo de Reflujo Venoso y a partir de éste realizar el diagnóstico de la insuficiencia valvular venosa en las extremidades inferiores. Se explican las características fundamentales del hardware empleado, que lo hacen idóneopara la prueba clínica de la bomba del músculo. Por último se realiza una comparación de la señal obtenida con la curva teórica. Se realizó una validación clínica preliminar obteniéndose parámetros estadísticos con un comportamiento positivo llegando a la conclusión de que el sistema es válido para la aplicación en el equipo médico ANGIODIN PD 3000(AU)

[The hemodynamic characterization of the diabetic patient with arterial calcifications]. / Caracterizacioón hemodinámica del paciente diabético con calcificaciones arteriales.

This study was designed to describe the presence of calcifications according to the clinical features of the diabetic patient and the hemodynamics of the calcified arteries. With this purpose, 197 lower limbs from diabetic patients (type I and II) and carbon-hydrate intolerant patients, were studied. In all of the patients, the pressure ratio leg/arm was measured. On the same way, the arterial flow velocity was recorded using the Doppler ultrasonography on the pedia and postero-tibial arteries. The arterial calcifications, evident on the radiography of the foot, were more frequent between the type I patients and the neuro-infections diabetic foot. According to the hemodynamics point of view, we found a trend of association of more pathologic arterial flow velocity curves with the presence of calcifications (specially on the intima layer). It was also remarkable that an arterial incomprensibility was always associated with arterial calcifications.

[A mathematical analysis of the flow-velocity curves in the femoral arteries]. / Análisis matemático de las curvas de velocidad de flujo en arterias femorales.

In order to improve the early diagnosis of the aortoiliac injuries, 98 arteries from several supposedly health patients (different ages) and 41 femoral arteries from patients with occlusion at this level (demonstrated by arteriography) were studied. The analysis from the Fourier's series showed highly significant differences between both groups, and so did the comparison of some indexes automatically measured by the Vasoscan VL equip. By multivariant statistics methods was selected the main group of parameters that allows the differentiation between the ill patients and the healthy ones. This procedure can be useful for the physiopathological study and it may be used as a non-invasive method of diagnosis.

[Hemodynamic bases for the automatized quantification of the degree of obstruction in peripheral arteries in diabetic patients]. / Bases hemodinámicas para la cuantificación automatizada del grado de obstrucción en arterias periféricas de pacientes diabéticos.

In order to improve the early diagnosis of arterial occlusions, we tried to establish the basis of an automatized system that allowed the study of the hemodynamic features of diabetic patients in the different stadii of their disease. Fifty-four patients with Diabetes Mellitus Type II were included in the study. In all of them, arterial flow curves were carried out at different levels: femoral, popliteal, pedia and tibial posterior arteries of both lower limbs. In the distal arteries of patients with hemodynamic injury, normal values of Maximal Systolic Velocity (Max A), Maximal Diastolic Velocity (Max D), Peurcelot's resistance (PR), pulsatility index (PI) and spectral band (SB), were found.

[Hemodynamic bases for the automated quantification of the degree of obstruction in the peripheral arteries of diabetic patients]. / Bases hemodinámicas para la cuantificación automatizada del grado de obstrucción en arterias periféricas de pacientes diabéticos.

In order to improve in the early diagnosis of an arterial occlusion, we proposed the bases of an automatized system that allows to recognize the hemodynamic features of diabetic patients in different stadiums of their disease. Fifty-four patients with type-II diabetes were studied. We recorded the arterial flow curves in the bilateral femoral, popliteal, pedia and tibial-posterior arteries from all of our patients. In the distal arteries from patients with hemodynamics disturbances, we found normal values of the variants measured: maximal systolic speed flow (Max A), maximal diastolic speed flow (Max D), Peurcelot's resistance (RP), pulsatility index (PI) and spectral band (SB).

[The study of arteriogenic erectile impotence by noninvasive methods]. / Estudio de la impotencia eréctil arteriogénica mediante métodos no invasivos.

With the development of noninvasive haemodynamic methods, recognition of arterial insufficiency signs is possible also in cases in which, in old times, we just could suspect a psychogenic cause. Although this advance, discrimination permitted by this method can be improved. Eighty-eight supposed healty patients and eighty-four patients with arteriogenic erectile impotency (tested by arteriography) were included into an study, which results are presented in here. Analysis made, avoided the effect of envelleiment on haemodynamic parameters interpretation. For identification of patients which obstructive arterial defect can be cause of sexual disfunction, combination of systolic pressure determination and arterial flow velocity curves (by Doppler ultrasonography) is proposed. We recommend this method as a part of the multifactorial examen required by such type of patients.

[A mathematical analysis of strain-gauge curves in the diagnosis of deep venous thrombosis]. / Análisis matemático de las curvas de "strain gauge" en el diagnóstico de las TVP.

The plethysmographic strain gauge venous outflow curves were studied by means of an exponential function. The parameters analyzed made possible the establishment of differences between patients with and without DVT.

[Determination of the steno-occlusive degree using non-invasive methods in diabetic patients with peripheral arterial insufficiency]. / Determinación del nivel esteno-oclusivo mediante métodos incruentos en pacientes diabéticos con insuficiencia arterial periférica.

58 diabetic patients with peripheric arteriopathy are studied by means of segmentary pressure and oscillometry. Best results for proximal levels were those obtained with segmentary pressure index, whereas oscillometry was better for distal level (ankle and foot). The application of these criteria would facilitate the detection of arterial occlusions without need arteriography.