Search results for "Bundle of His"

showing 3 items of 3 documents

Supernormal conduction in the right bundle branch: lack of influence of autonomic blockade.

1984

A programmed atrial stimulation at a driving rate of 100/min was performed in a 47-year-old woman with left bundle branch block. Supernormal conduction lasting 40 ms was revealed within the right bundle branch. After autonomic blockade (0.2 mg propranolol/kg body weight and 0.04 mg atropine/kg body weight) the position and duration of the supernormal conduction did not change. This suggests that the autonomic nervous system has no influence on the supernormal phase of conduction in the human intraventricular conduction system.

Atropinemedicine.medical_specialtyBundle of HisSupernormal conductionBundle-Branch BlockPropranololHeart Conduction SystemInternal medicineDrug DiscoveryAutonomic blockademedicineHumansRight bundle branchGenetics (clinical)Bundle branch blockbusiness.industryLeft bundle branch blockGeneral MedicineMiddle Agedmedicine.diseasePropranololAutonomic nervous systemAtropineAnesthesiaCardiologyMolecular MedicineFemalebusinessmedicine.drugKlinische Wochenschrift
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“Three-level shock” in ablation-refractory paroxysmal atrial fibrillation

1987

His-bundle ablation is a very effective method to control drug-refractory supraventricular arrhythmias. We present a 69-year-old woman with paroxysmal atrial fibrillation, in whom several attempts of unipolar and bipolar His-bundle ablation were ineffective. Ultimately a stable 2/1 atrioventricular block was induced when three successive shocks of 400 W were applied. The first shock was given in that position with the largest His-potential deflection. The other two shocks were applied at catheter positions more distal and more proximal from the first one, respectively. We suppose that the initial lack of success was due to an atypical atrioventricular junction anatomy.

Bundle of HisCardiac Catheterizationmedicine.medical_specialtyDefibrillationParoxysmal atrial fibrillationmedicine.medical_treatmentElectric CountershockElectrocardiographyInternal medicineAtrial Fibrillationmental disordersmedicineHumanscardiovascular diseasesAgedSupraventricular arrhythmiabusiness.industryAtrial fibrillationGeneral Medicinemedicine.diseaseAblationCatheterHeart Blockcardiovascular systemCardiologyFemaleSupraventricular tachycardiaCardiology and Cardiovascular MedicinebusinessAtrioventricular blockClinical Cardiology
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A method for quantifying atrial fibrillation organization based on wave-morphology similarity

2002

A new method for quantifying the organization of single bipolar electrograms recorded in the human atria during atrial fibrillation (AF) is presented. The algorithm relies on the comparison between pairs of local activation waves (LAWs) to estimate their morphological similarity, and returns a regularity index (/spl rho/) which measures the extent of repetitiveness over time of the detected activations. The database consisted of endocardial data from a multipolar basket catheter during AF and intraatrial recordings during atrial flutter. The index showed maximum regularity (/spl rho/=1) for all atrial flutter episodes and decreased significantly when increasing AF complexity as defined by W…

Signal processingBundle of Hismedicine.medical_specialtyMorphological similarityAtrial fibrillation (AF)Biomedical EngineeringSensitivity and SpecificityPattern Recognition AutomatedElectrocardiographySimilarity (network science)Heart RateInternal medicineAtrial Fibrillationotorhinolaryngologic diseasesmedicineHumansClinical treatmentWaveform morphologyMathematicsmedicine.diagnostic_testMinimum distanceModels CardiovascularReproducibility of ResultsSignal Processing Computer-AssistedAtrial fibrillationEndocardial signalmedicine.diseaseTachyarrhythmia organizationCardiologysense organsRhythm classificationBasket catheterElectrocardiographyAlgorithmsAtrial flutterBiomedical engineeringIEEE Transactions on Biomedical Engineering
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