Biomedical subjects
Publications and source records attributed to S Cotoi.
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The use of light reflection rheography (LRR) has reached an important level in the past few years. Using the originally construed and conceived RRL 001 device, we present the basic principles, the working technique and the limits of this method. We will use two magnetic amplifiers, one for the finger tip, which measures the capillary blood flow at this level and a venous magnetic amplifier which measures the blood flow in the venous plexuses at a 1-2 mm depth. The detection of the blood flow in the subcutaneous (hypodermic) venous areas leads to the diagnosis of profound thrombophlebitis and venous valves insufficiency. The detection of the capillary flow in the finger tip, its presentation as a curve, measuring the pressure of the inter digital arteries (using Riva Rocci method), establishing the index of systolic pressure make possible the understanding of the gravity of the existing hemodynamic disorders (especially in what concerns the Raynaud syndromes), the supervision of the original disease and the efficiency of the treatment. Weindorf was the first one to use the RRL technique in medicine in 1985 and, after 1997, it has been developed through Sproule's work. Within The Medical Clinic of the Municipal Hospital, a light reflection rheograph has been built and forwarded as innovation. The device has been used for 2 years in the diagnosis of venous disorders and peripheral microcirculation disorders. In this article we present the principles of the LRR examination of the lower limb venous system and of the microcirculation of the fingers of the upper limbs, an examination based upon our own experience which includes 72 examinations.
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Electrical activity of the sinoatrial node was recorded on bipolar intracavitary leads at superior vena caval-right atrial junction in ten patients. These recordings may be important for practical purposes, but they still have many limitations concerning the amount of the atrial potentials which can be recorded together with sinoatrial potential.
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In 29 patients with atrial fibrillation, using the monophasic action potential technique, the fibrillatory waves were recorded and analyzed by statistical methods. Concerning the characteristics of the fibrillatory waves there are no differences between patients with rheumatic heart disease and with coronary heart disease. The patients with paroxysmal forms and those without heart failure and with normal heart size, have similar statistical data with regard to their fibrillatory waves. From the data presented, it could be possible to predict the efficacy of conversion to sinus rhythm and also the sinus rhythm stability after conversion.
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An intermittent vanishing of the P wave from a standard electrocardiogram (ECG) while normal atrial activity was recorded on intracavitary leads was observed in a 58 year old man. This intermittent concealed atrial conduction is discussed.
Two types of the initiation of atrial fibrillation are demonstrated in the continuous recordings of right atrial monophasic action potentials. In the first way, more common, atrial fibrillation takes place suddenly after an an extrasystolic atrial beat, in the second one it develops gradually after atrial tachycardia. In the first type the micro reentry starts from the beginning, in the second type only after sustained focal atrial tachycardia.
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Right atrial monophasic action potential was recorded using a suction electrode catheter in 20 patients with chronic cor pulmonale. The duration of right atrial monophasic action potential was recorded using suction electrode catheter in 20 patients with chronic corpulmonale. The duration of right atrial monophasic action potential was 397 +/- 17 msec, longer than the normal value of 325 +/- 37 msec found in 30 normal subjects. The conclusion of our work is that the long right atrial monophasic action potential duration may explain the sinus rhythm stability and the rarity of atrial arrhythmias in chronic cor pulmonale.
Using Lidocaine intravenously in 99 patients with atrial arrhythmias, it was observed that the drug has a regularising effect in 41 from 45 atrial arrhythmia, atrial tachycardia with block and accelerated ectopic supraventricular tachycardia, where the enhanced focal activity should be taken into account. No effect was observed in functional supraventricular tachycardia, paroxysmal atrial flutter and fibrillation and tachyarrhythmia in WPW syndrome, where the re-entry mechanism plays the major role. The effect of the drug is short lived, but may be prolonged by using the drug in perfusion or repeatedly with an intramuscular method. Lidocaine acts by depressing the enhanced atrial focal activity, and therefore may be of value in the treatment of these kinds of arrhythmias.
A 62 year-old man with hiatal hernia and complex atrial arrhythmia is reported. On the standard electrocardiogram a double atrial parasystole is found, with reversed coupling. During carotid sinus massage only one of the parasystolic foci is not influenced, and assumes the atrial activity, regularizing the cardiac rhythm.
Two elderly patients with coronary heart disease, chronic pulmonary disease, and complex atrial arrhythmias are presented. The suction electrode technique for right atrium monophasic action potential recording was used. This recording allows better analysis of the atrial arrhythmias and estimates the stability of focal activity.
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Explore the source record for details and available documents.
Explore the source record for details and available documents.
Explore the source record for details and available documents.