Can transventricular intracardiac impedance measurement discriminate haemodynamically unstable ventricular arrhythmias in human?
| Autor: | Deborah Edgar, Telal Mudawi, Gerry Kaye, Michael Lippert, Gerald Czygan |
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| Rok vydání: | 2007 |
| Předmět: |
Male
medicine.medical_specialty Hemodynamics Ventricular tachycardia Cardiography Impedance Sensitivity and Specificity Intracardiac injection Electrocardiography Predictive Value of Tests Physiology (medical) Internal medicine medicine Humans Sinus rhythm Coronary sinus Arterial pulse pressure business.industry Transventricular Cardiac Pacing Artificial Middle Aged medicine.disease Catheter Cardiology Linear Models Tachycardia Ventricular Female Cardiology and Cardiovascular Medicine business |
| Zdroj: | Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology. 9(2) |
| ISSN: | 1099-5129 |
| Popis: | Aims To measure changes in transventricular impedance during arrhythmias. Methods and results Patients were studied during electrophysiological studies. A quadrapolar catheter was positioned at the right ventricular apex (RVA) and a decapolar catheter within the coronary sinus (CS). Transventricular impedance was measured by injecting a subthreshold biphasic rectangular pulse of 600 mA between poles 1 of the CS catheter and pole 1 of the RVA catheter and the voltage measured between CS pole 10 and RVA catheter pole 4. Stroke impedance (SZ), surface ECG, intracardiac electrogram (IEGM), and invasive femoral artery blood pressure (FAP) were recorded. Twenty-eight patients were analysed, 5 with inducible, haemodynamically unstable ventricular tachycardia (VT) (HUSVT), 5 with stable VT (HSVT). During HUSVT, the SZ value reduced to 22% (range 0.15–0.32 P , 0.001) in comparison with sinus rhythm. For HSVT, the SZ value reduced to 58% (range 0.33–0.88) P , 0.01, significantly different from HUSVT (P , 0.01). There was a good correlation between reduction of SZ and arterial pulse pressure (PP) during arrhythmias (r ¼ 0.95). Conclusion Changes in SZ strongly correlated with PP amplitude. Transventricular impedance fell significantly during unstable arrhythmias and may be useful as a sensor capable of haemodynamic discrimination. |
| Databáze: | OpenAIRE |
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