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 20 for “"Sinus Rhythm"”.
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Can the measurement of transventricular intracardiac impedance reliably differentiate haemodynamically stable from unstable arrhythmias?
… unable to assess the haemodynamic stability of arrhythmias and can occasionally deliver intracardiac shocks when patients are conscious. We investigated the use of trans-ventricular impedance (across the left ventricle {LV}) as a haemodynamic sensor during arrhythmias in man.Methodology: …
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VALUTAZIONE DI UNA COMPONENTE A BASSA FREQUENZA DELLA VARIABILITÀ DELLA PRESSIONE ARTERIOSA SISTOLICA IN PAZIENTI CON FIBRILLAZIONE ATRIALE PERSISTENTE E SUA SUCCESSIVA ULTERIORE VALUTAZIONE MEDIANTE LINGUISTIC ANALYSIS
Atrial fibrillation (AF) is a common arrhythmia characterized by irregular ventricular response. During AF, beat-to-beat variability of arterial pressure (AP) is increased because of continuous changes in filling time, stroke volume and contractility. Only a few studies have analyzed short-term AP …
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Prevalence, characteristics and additional stroke risk stratification: an analysis of the Atrial Fibrillation cohort within the REMEDY study
… Atrial fibrillation (AF) is the most common arrhythmia and may be complicated by embolic stroke. It is also associated with a significant risk of heart failure and mortality. The burden of rheumatic heart disease remains great in the developing world. The prevalence of AF in those with …
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Study of the Kalman filter for arrhythmia detection with intracardiac electrograms
… pacing. The schemes for detecting cardiac arrhythmias often realize nonpathologic tachycardia as serious arrhythmias and deliver false shocks. In this study, an arrhythmia classification technique has been developed with the use of Kalman filter applied on cyclostationary autoregressive …
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Circulating progenitor cells in atrial fibrillation: Relationship to endothelial dysfunction, thrombogenesis and inflammation
Atrial fibrillation (AF) is the most common arrhythmia encountered in clinical practice with rapidly rising prevalence and incidence predominantly due to advancing age in Western populations. Of particular concern however is the strong relationship between AF and stroke. This relates to a number of …
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Universal Atrial Coordinate (UAC) for Wall Motion Deep Learning
… fibrillation (AF), the most common persistent arrhythmia, increases stroke risk through altered left atrial (LA) wall motion and blood stagnation in the left atrial appendage (LAA). Standard scores like CHA₂DS₂-VASc overlook patient-specific motion patterns, while AF's episodic nature and …
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QT variability calculation using a template matching algorithm and power spectral analysis
… analysis conducted on patients with normal sinus rhythm and those with arrhythmias. This system has been tested statistically, showing a less than 10 percent deviation from a standardized database of QT interval lengths (Physionet MIT/BIH databases) in all cases and less than 5 percent in …
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An investigation of neural computing applied to the ambulatory monitoring of the electrocardiogram
… through identification and rejection of nonnal sinus rhythm so that only abnormal heart cycles shall be presented for recording. Traditional ECG classification techniques are critically assessed in terms of their suitability for this project, however, it was concluded that their effectiveness is …
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The prevalence, determinants, natural history and impact of atrial fibrillation and atrial flutter in patients with tuberculosis pericarditis - insights from the IMPI trial
… fibrillation (AF) is the most common sustained arrhythmia encountered in clinical practice. It is associated with increased cardiovascular mortality and morbidity, as well as complications related to thromboembolic disease and haemodynamic instability. Similarly, atrial flutter (AFL) is a common …
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Ex-Vivo Slaughterhouse Porcine Crystalloid-Perfused Beating Heart via Langendorff Method
… 1 hour global contraction, and 110bpm stabilized sinus rhythm. ECG displayed prominent QRS complex. Significant calcium overload and edema inhibited contractile function at 1 hr. The Langendorff beating heart apparatus will serve as a platform for further biomedical engineering research to …
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RUOLO DELLA STIMOLAZIONE VAGALE SULLA PROLIFERAZIONE DEI FIBROBLASTI CARDIACI IN VIVO IN MODELLO ANIMALE DI FIBRILLAZIONE ATRIALE.
… including hypertrophy, failure, and arrhythmias. Atrial fibrillation (AF) is the most common sustained clinical arrhythmia and is a major cause of population morbidity and mortality. Recent studies have demonstrated that structural remodeling, involving prominent fibrotic changes, is a …
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Electrocardiographic predictors of poor outcome in acute myocardial infarction
… p=0.012) were predictive of poor outcome, wheras sinus rhythm with normal rate was associated with a better prognosis (OR 0.33 [95% CI 0.12- 0.91] p=0.032). Patients with two or more risk factors (i.e., LAE, ST depression, sinus tachycardia) experienced higher mortality rates (p<0.001).Conclusion: …
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Incidence and Clinical Predictors of Risk Factors for Inappropriate Shock in Patients with Implantable Cardioverter-Defibrillators
… in diagnosing and treating life threatening arrhythmias, inappropriate shock therapy (IST) occurs in approximately 5-20% of ICD recipients. IST results in pain, anxiety, induction of ventricular arrhythmias, decreased battery longevity, and even death. Researchers studying clinical predictors …
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Exploration of Supraventricular Conduction with respect to Atrial Fibrillation. Methodological Aspects on Selected Techniques
Atrial fibrillation is the most common cardiac arrhythmia that demands medical attention. Computer-based detailed analysis of cardiac electrical signals from healthy subjects and patients with a history of atrial fibrillation has become an important tool in the further clarification of this …
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The electrophysiological effects of Endothelin-1 in human atrial myocytes
… appendage obtained from consenting patients in sinus rhythm undergoing cardiac surgery. The nystatin-perforated whole cell patch clamp technique was used at 37ºC to record ICaL and action potentials in voltage-clamp and current-clamp mode respectively. Results: The current-voltage relationship …
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The electrophysiological and molecular effects of chronic beta-adrenoceptor antagonist therapy on human atrium
… tissue obtained from consenting patients, in sinus rhythm, undergoing cardiac surgery. Using whole cell patch clamping, K+ currents were recorded at physiological temperature. Treatment of patients with β-blockers for a minimum of 4 weeks duration was associated with a significant, 34% …
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Retrospective validation of the San Francisco Syncope Rule for prediction of short-term serious outcomes in adult syncope patients
… outcomes: death, myocardial infarction, arrhythmia, pulmonary embolism, stroke, subarachnoid hemorrhage, significant bleeding anywhere, any procedural intervention to treat a related cause of syncope, any condition causing/likely to cause a return emergency visit or hospitalization for a …
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A Comprehensive Evaluation of Cardiac Electro-Anatomic Mapping Using Body Surface Potentials
… clinically useful information about heart rhythm disturbances. To date, a complete in-vivo validation of this inverse mapping approach has not been performed in large animals or humans. The principal objectives of this thesis were to evaluate the accuracy and reliability of inverse …
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The Direct Impact of Trimethelamine-N-Oxide on Cardiac Function
… wave aptitude in 6w and 13w TMAO feed group with sinus rhythm. However, 3w TMAO intake had no impact on both cardiac contractability and ECG. Moreover, chronic TMAO supplement (13w) showed increased left ventricle (LV) mass on echocardiography and increased LV thickness on the tissue section. …
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Atrial Conduction and P-wave Characteristics: From histology to electrophysiology
P-wave morphology reflects the projection of the depolarization vector on the electrocardiogram (ECG)lead axes 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 …