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Impedance Monitoring (impedance + monitoring)

Distribution by Scientific Domains
Medical Sciences100%

Selected Abstracts

Detection of Inadvertent Catheter Movement into a Pulmonary Vein During Radiofrequency Catheter Ablation by Real-Time Impedance Monitoring

JOURNAL OF CARDIOVASCULAR ELECTROPHYSIOLOGY, Issue 6 2004
PETER CHEUNG M.D.
Introduction: During radiofrequency ablation to encircle or isolate the pulmonary veins (PVs), applications of radiofrequency energy within a PV may result in stenosis. The aim of this study was to determine whether monitoring of real-time impedance facilitates detection of inadvertent catheter movement into a PV. Methods and Results: In 30 consecutive patients (mean age 53 ± 11 years) who underwent a left atrial ablation procedure, the three-dimensional geometry of the left atrium, the PVs, and their ostia were reconstructed using an electroanatomic mapping system. The PV ostia were identified based on venography, changes in electrogram morphology, and manual and fluoroscopic feedback as the catheter was withdrawn from the PV into the left atrium. Real-time impedance was measured at the ostium, inside the PV at approximately 1 and 3 cm from the ostium, in the left atrial appendage, and at the posterior left atrial wall. There was an impedance gradient from the distal PV (127 ± 30 ,) to the proximal PV (108 ± 15 ,) to the ostium (98 ± 11 ,) in each PV (P < 0.01). There was no significant impedance difference between the ostial and left atrial sites. During applications of radiofrequency energy, movement of the ablation catheter into a PV was accurately detected in 80% of the cases (20) when there was an abrupt increase of ,4 , in real-time impedance. Conclusion: There is a significant impedance gradient from the distal PV to the left atrium. Continuous monitoring of the real-time impedance facilitates detection of inadvertent catheter movement into a PV during applications of radiofrequency energy. (J Cardiovasc Electrophysiol, Vol. 15, pp. 1-5, June 2004) [source]

Review article: intra-oesophageal impedance monitoring for the assessment of bolus transit and gastro-oesophageal reflux

ALIMENTARY PHARMACOLOGY & THERAPEUTICS, Issue 1 2009
J. M. CONCHILLO
Summary Background, Intra-oesophageal impedance monitoring can be used to assess the clearance of a swallowed bolus (oesophageal transit) and to detect gastro-oesophageal reflux independent of its acidity. Aim, To discuss the clinical application of the impedance technique for the assessment of bolus transit and gastro-oesophageal reflux. Methods, Review of the literature on intra-oesophageal impedance monitoring of bolus transit and gastro-oesophageal reflux. Results, Using impedance criteria, normal oesophageal bolus clearance can be defined as complete clearance of at least 80% of liquid boluses and at least 70% of viscous boluses. Impedance recording identifies oesophageal function abnormalities in non-obstructive dysphagia patients and in patients with postfundoplication dysphagia. The impedance technique seems to be less suitable for the most severe end of the dysphagia spectrum like achalasia. Intra-oesophageal impedance monitoring detects reflux events independent of the pH of the refluxate, which allows identification of non-acid reflux episodes. In addition, use of impedance monitoring enables assessment of the composition (liquid, gas, mixed) and proximal extent of the refluxate. Combined impedance,pH monitoring is more accurate than pH alone for the detection of both acid and weakly acidic reflux. Furthermore, addition of impedance monitoring to pH increases the yield of symptom association analysis both in patients off and on proton pump inhibitor therapy. Conclusions, Intra-oesophageal impedance monitoring is a feasible technique for the assessment of bolus transit and gastro-oesophageal reflux. Combined impedance,manometry provides clinically important information about oesophageal function abnormalities and combined impedance,pH monitoring identifies the relationship between symptoms and all types of reflux events regarding acidity and composition. [source]

Thoraco-abdominal impedance monitoring of respiratory rate during sedation

ANAESTHESIA, Issue 9 2009
J. Wilson
No abstract is available for this article. [source]

Thoracic impedance monitoring of respiratory rate during sedation , is it safe?

ANAESTHESIA, Issue 4 2009
J. N. Wilkinson
No abstract is available for this article. [source]

Management of laryngopharyngeal reflux: an unmet medical need

NEUROGASTROENTEROLOGY & MOTILITY, Issue 2 2010
F. Zerbib
However, these symptoms are difficult to characterize and the laryngoscopic signs lack specificity. Moreover, to date, the diagnosis of LPR can rely neither on esophageal investigations (endoscopy, pH/impedance monitoring) nor on response to high dose proton pump inhibitors because of a high placebo effect. Therefore, there is a need for the development of new tools which may help to better identify the subgroup of patients with laryngeal symptoms related to supra-esophageal reflux. [source]