Cardiac Memory in Canine Atrium
نویسندگان
چکیده
منابع مشابه
Cardiac memory in canine atrium : identification and implications.
BACKGROUND Memory is a diverse biological phenomenon whose importance in the ventricle has been demonstrated. We hypothesized its occurrence in the atrium, contributing to the modulation of cardiac rhythm. METHODS AND RESULTS We analyzed P and Ta waves in conscious chronically instrumented dogs with complete heart block. Animals were atrioventricularly sequentially paced at 5% greater than th...
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In the isolated, blood-perfused, canine right atrium, stimulation of the intramural autonomic nerves evoked negative chronotropic and inotropic responses. The responses were not maintained at a constant level during tonic neural stimulation, but they tended to drift back toward their control levels. These time-dependent changes in the cardiac responses were more pronounced the higher the freque...
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Right atria from excised beating dog hearts were immersed in Tyrode solution with the endocardial surface of the anterior wall exposed. Glass microelectrodes were used to impale fibers in different anatomical areas of this preparation. Fibers with action potentials similar in contour to those of ventricular Purkinje fibers were found along the caval border of the crista terminalis in the area o...
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A 73-year old man underwent transthoracic and transoesophageal echocardiography and computed tomography, which revealed what appeared to be an asymptomatic primary mobile tumour located in the right atrium. During surgery, the mass was found to be associated with the right atrial septum and was subsequently resected. Histopathology of the mass revealed a cardiac varix with phleboliths. The pati...
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Primary cardiac tumours are quite rare. Only 7 cases were reported in a series of 12,000 autopsies, and its prevalence is less than 0.1% [1]. Malignant tumours account for approximately 15% of primary cardiac tumours, and sarco-mas are the most common [2]. Cardiac sarcomas are quite rare and have been published as isolated case reports. Rhabdomyosarcomas account for 20% of overall cardiac sarco...
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ژورنال
عنوان ژورنال: Circulation
سال: 2001
ISSN: 0009-7322,1524-4539
DOI: 10.1161/01.cir.103.3.455