Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"right atrium"”.
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Central Venous Pressure Reference Points Measured on Post-Mortem Subject
… zero reference level corresponding with mid right atrial level would make possible reliable measurements in either position. The purpose of this study was to help determine the reliability of two central venous pressure extrathoracic reference points; the midaxillary line as it intersects the …
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Unterschiedliche autonome Innervation in Pulmonalvene, linkem Vorhof und rechtem Vorhof : eine elektrophysiologische und pharmakologische Charakterisierung
… effective refractory periods in pulmonray veins, right atrium and left atrium and correlated these functional properties to the underlying neuromorphology. Both raising intraatrial pressure and high intesity stimulation significantly decreased effective refractory period. In 36 …
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Epicardial Wireless Pacemaker for Improved Left Ventricular Resynchronization (Conceptual Design)
… CRT device electrically coupled to the right side of the heart. It controls the right atrium and ventricle via transvenous leads anchored to the endocardium of the heart. The master device generates the pacing pulses to stimulate the right atrium and right ventricle and a communications …
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Atrial Conduction and P-wave Characteristics: From histology to electrophysiology
… in three-dimentional space and reflects both right and left atrial activation. The main purpose of current thesis was to explore the internal logic between the atrial conduction properties, including intra- and inter- atrial conduction, and P-wave characteristics from the level of histology to …
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Αιμοδυναμικές και αναπνευστικές επιδράσεις της θειϊκής πρωταμίνης σε σχέση με την οδό και τον ρυθμό χορήγησης: Πειραματική μελέτη
… the same vein, Group III: slow infusion into the right atrium, Group IV: rapid infusion into the right atrium, Groups V and VI: slow and rapid infusion into anscending aorta respectively. During and at the end of infusion, as well as 15, 30 and 45 min after it all measured parameters were recorded …
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Intramyokardiale Expression von pro- und anti-inflammatorischen Zytokinen und von iNOS bei Säuglingen mit angeborenem Herzfehler
… by heart failure in infants with left-to-right shunt or by hypoxia due to congenital cardiac defects. 22 infants (mean age 6,3 months) with heart failure due to a large intraventricular left-to-right shunt because of VSD (n=7) and AVSD (n=8) or without heart failure but with Tetralogy of …
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Age-associated changes to calcium handling proteins across the whole heart
… pumps (PMCA) were analysed in the SA node, right atrium, left atrium, left ventricle and right ventricle.The effect of ageing of the SA node was assessed via recordings of intrinsic heart rate in response to isoprenaline, a β-adrenergic stimulator, and nifedipine. With age response to …
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Characterisation of clinical and anatomical substrates in risk stratification and management of atrial fibrillation and ischaemic stroke
… disease burden, in particular dilatation of the right atrium and impairment of left atrial function. Further, impairment of left atrial function has been found to be associated with atrial fibrillation-related rehospitalisation and adverse cardiovascular outcomes in this cohort. Finally, …
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Mapping the Characteristics of Atrial Activation Patterns During Atrial Fibrillation
… from temporary wire electrodes sutured to the right atrium (RA), the left side of Bachmann’s bundle and posterior left atrium. During AF, a regular rhythm was recorded during four of six episodes from the left atrium, while an irregular rhythm with varying AEG morphologies and CLs was present …
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Volumetric Acoustic Radiation Force Impulse Imaging Using Intracardiac Echocardiography
… (AF). Shear wave velocities of baseline LA and right atrium (RA), low electrogram voltage areas of the LA, and ablated LA are reported. The second chapter investigates through simulation and experiments the volumetric B-mode imaging performance of helicoid array transducers. Experimental …
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Hemodynamics Due to Calf Muscle Activity-Biophysical Modeling and Experiments Using Frequency Domain Near Infrared Spectroscopy in Healthy Humans
… stasis. Blood flow from the periphery to the right atrium is referred to as venous return. This flow back to the heart against gravity during standing is facilitated by lower limb muscle contraction that compresses the local intramuscular and deep veins. This increases the intraluminal …
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Chronische Modulation des parasympathischen Nerventonus des Atrioventrikularknotens : Entwicklung eines Neurostimulators mit transvenöser Sondenimplantation zur ventrikulären Frequenzkontrolle bei Vorhofflimmern
… mongrel dogs, the small endocardial area in the right atrium overlying the IAGP was identified by neuromapping with probatory high-frequency stimulation (20 Hz) by using a custom-made positioning catheter with a distal pair of electrodes. After identification of the stimulation area, an …
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Relato de caso: manejo anestésico de nefrectomia com trombectomia cavoatrial sob circulação extracorpórea
… Cases in which the thrombus extends to the right atrium (RA) are rarer, occurring in approximately 1% of patients, and require a complex surgical approach and invasive anesthetic support. Case report: Male patient, A.B.C., 44 years old, previously healthy, ASA II, diagnosed with CCC of the …
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Effect of Lateral Positioning on Central Venous Pressure
… have been well demonstrated in studies in upright and supine subjects. From these studies it was reasoned that theoretically, central venous pressure should not be altered by change in position from supine to lateral so long as the horizontal plane is held constant since in this situation the …
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Hemodynamic Optimization of a Passive Assist Total Cavopulmonary Connector for ages 1-20
… by the majority of cardiac surgeons to address right ventricular dysfunction is the Fontan procedure, which connects the superior and inferior vena cava directly to the left and right pulmonary arteries bypassing the right atrium. However, this is not the most efficient configuration from a …
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The Heart of the Rugby Football League Athlete: An Aid to Pre-Participation Cardiac Screening
… structural and functional indices of the right heart of the senior RFL athlete using TTE and STE; 3) to provide a comparative and holistic, structural and functional assessment of the junior and senior RFL athletic heart using TTE and STE and 4) To assess variation in cardiac parameters …
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Expression des 'Vascular endothelial growth factor' bei Kindern mit angeborenem Herzfehler : Einfluss der präoperativen Hypoxämie und der Herzoperation
… and postoperatively and a biopsy of myocardium (right atrium) was taken during the operation. VEGF concentrations were measured in the plasma by enzyme-linked immunosorbent assay (ELISA). The VEGF-mRNA expression in the myocardium was detected by Real-Time-Polymerase Chain Reaction …
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Myokardiale Expression von Estrogenrezeptoren bei Patienten mit angeborenem Herzfehler
… we proved with all our patients BNP-RNA in the right atrium. Here, we also could not assess any connection between age, gender and the BNP expression. Another important point of our study is the first-time proof of a correlation between the expression of ERa&b and that of BNP. So far, only a …
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Neurally Released Nitric Oxide does not Oppose Reflex Cholinergic Contraction of Airway Smooth Muscle in Dogs
… a lobar bronchus) and capsaicin (injected into right atrium).|The first part of our study demonstrated that changes in airway resistance to hypertonic saline and capsaicin are neurally mediated. We compared changes in airway resistance to hypertonic saline and capsaicin before and after …
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Novel applications of fluorine-18 labelled radiotracers in cardiovascular disease
… after correction for blood pool activity in the right atrium. Fifty-three patients were scanned: 18 with cardiac amyloid (10 ATTR and 8 AL), 13 control subjects and 22 patients with aortic stenosis. No differences in myocardial TBR values were observed between participants scanned in Edinburgh …
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