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2 2005

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ATR BIOLAB : system for Achilles tendon reflex measurement

Kneppo P., Rosík V., Ždiňák J., Švehlíková J., Tyšler M.

Elektronika : konstrukcje, technologie, zastosowania

2005

Vol. 46, nr 8

45-47

The Achilles Tendon Reflex module of BIOLAB distributed measuring system for biophysical examinations is presented. The device is intended for non-contact measurement of ATR time intervals as indicators of the neuromuscular system functioning. After ATR is initiated by a neurological hammer, motion of the sole during the reflex is scanned by an IR optoelectronic system and ATR signal is sampled at 1 kHz. Record is transferred into the evaluating PC unit and characteristic ATR time intervals are extracted and evaluated by the PC software.

Zaprezentowano system pomiarowy do badania reakcji ścięgna Achillesa. System umożliwia bezdotykowy pomiar czasów reakcji ATR (Achilles Tendon Reflex) będących wskaźnikiem funkcjonowania układu neuromięśniowego. Skanowano ruch stopy po zadaniu bodźca młotkiem neurologicznym. Do skanowania stosowany jest system optyczny działający w podczer0wieni. System zastosowano do badania pacjentów z chorobami tarczycy oraz jako pomoc w nauczaniu bioinżynierii.

Use of body surface potential maps for model-based assessment of local pathological changes in the heart

Tyšler M., Turzová M., Tiňová M., Švehlíková J., Hebláková E., Szathmáry V., Filipová S.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2005

Vol. 53, nr 3

207-215

High resolution body surface potential maps and an equivalent current dipole model of the cardiac generator were used to assess the heart state in two abnormal conditions: WPW syndrome with single accessory pathway and local ventricular ischemia. Results of a simulation study and experimental verification of the method for both cardiologic abnormalities are presented. Single accessory pathway in WPW syndrome was simulated as initial ventricular activation at the atrio-ventricular ring. Using a current dipole model of the cardiac generator, the locus of arrhythmogenic tissue was assessed with a mean error of 11 mm. Experimental localization of the accessory pathway in a WPW patient was in good agreement with the invasively obtained site. Local repolarization changes were simulated as shortening of the myocytes action potentials in three regions typical for stenosis of main coronary arteries. Using surface QRST integral maps and dipolar source model, small subendocardial and subepicardial lesions of myocardium were inversely located with a mean error of 9 mm and larger transmural lesions with a considerable mean error of 17 mm. Extent and prevalence of subepicardial or subendocardial type of the lesion were reflected in the dipole moment and orientation. In experimental verification of the method, in 7 of 8 patients that underwent PCI of a single vessel, estimated equivalent current dipole position matched well the treated vessel. The results suggest that diagnostic interpretation of body surface potential maps based on dipolar source model could be a useful tool to assess local pathological changes in the heart.