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Diagnostika ventrikulárních tachykardií z elektrokardiografického záznamu.
Šrutová, Martina ; Hrubeš, Jan (oponent) ; Kolářová, Jana (vedoucí práce)
Cílem této práce je diagnostika ventrikulárních tachykardií, fibrilací a flutterů z elektrokardiogramu. Tyto poruchy srdečního rytmu patří mezi život ohrožující arytmie. V následující práci je presentována vlastní metoda automatické detekce vytvořená pro EKG holterovský monitorovací systém. Navržený algoritmus je založen na detekci ve spektrální oblasti podpořený detekcí v oblasti časové. Výsledek práce je ověřen na diskriminaci nalezených arytmií vůči normálnímu EKG záznamu a na diskriminaci vůči šumu. Úspěšnost detekce je testována na signálech z databází The AHA Database (The American Heart Association) a The MIT-BIH Malignant Ventricular Arrhythmia Database.
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Influence of autonomic nervous system in the inducibility of atrial fibrillation.
Šrutová, Martina ; Provazník, Ivo (oponent) ; Kolářová, Jana (vedoucí práce)
The aim of this study is to investigate changes in sympatho-vagal balance before the initiation of AF. Six mongrel dogs from the Cleveland Clinic foundation were included in this study. ECG was recorded for 24 hours using telemetric Holter monitoring. AF was periodically induced every 30 min. by applying brief bursts of 40 high-frequency atrial train impulses (TI). From the 24 hours signals' traces shorter data episodes were extracted. Each episode consisted of 10 minutes preceding the atrial burst, and 3 minutes following the (TI). The 10 minutes episodes were processed automatically to determine the QRS complexes and RR intervals, and to calculate the HRV parameters. The presence and the duration of AF were determined by manual examination in each of the 3 minutes intervals following the delivery of TI. When the AF was generated, but episodes of AF were shorter than 30 seconds, three HRV parameters were significantly different than when AF was not generated. The HF component was lower in episodes that generated AF. The LF component was higher in episodes that generated AF. No significant differences were found when episodes of AF were longer than 30 seconds. Short episodes of AF could be generated when a certain disorder between sympathetic and parasympathetic tone is present. However in order to be able to generate longer AF episodes it is necessary another component not necessary related to the nervous system. Further analysis with a higher number of dogs should be needed.
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Influence of autonomic nervous system in the inducibility of atrial fibrillation.
Šrutová, Martina ; Provazník, Ivo (oponent) ; Kolářová, Jana (vedoucí práce)
The aim of this study is to investigate changes in sympatho-vagal balance before the initiation of AF. Six mongrel dogs from the Cleveland Clinic foundation were included in this study. ECG was recorded for 24 hours using telemetric Holter monitoring. AF was periodically induced every 30 min. by applying brief bursts of 40 high-frequency atrial train impulses (TI). From the 24 hours signals' traces shorter data episodes were extracted. Each episode consisted of 10 minutes preceding the atrial burst, and 3 minutes following the (TI). The 10 minutes episodes were processed automatically to determine the QRS complexes and RR intervals, and to calculate the HRV parameters. The presence and the duration of AF were determined by manual examination in each of the 3 minutes intervals following the delivery of TI. When the AF was generated, but episodes of AF were shorter than 30 seconds, three HRV parameters were significantly different than when AF was not generated. The HF component was lower in episodes that generated AF. The LF component was higher in episodes that generated AF. No significant differences were found when episodes of AF were longer than 30 seconds. Short episodes of AF could be generated when a certain disorder between sympathetic and parasympathetic tone is present. However in order to be able to generate longer AF episodes it is necessary another component not necessary related to the nervous system. Further analysis with a higher number of dogs should be needed.
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Diagnostika ventrikulárních tachykardií z elektrokardiografického záznamu.
Šrutová, Martina ; Hrubeš, Jan (oponent) ; Kolářová, Jana (vedoucí práce)
Cílem této práce je diagnostika ventrikulárních tachykardií, fibrilací a flutterů z elektrokardiogramu. Tyto poruchy srdečního rytmu patří mezi život ohrožující arytmie. V následující práci je presentována vlastní metoda automatické detekce vytvořená pro EKG holterovský monitorovací systém. Navržený algoritmus je založen na detekci ve spektrální oblasti podpořený detekcí v oblasti časové. Výsledek práce je ověřen na diskriminaci nalezených arytmií vůči normálnímu EKG záznamu a na diskriminaci vůči šumu. Úspěšnost detekce je testována na signálech z databází The AHA Database (The American Heart Association) a The MIT-BIH Malignant Ventricular Arrhythmia Database.
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