Impedance measurement of absolute blood flow using an angioplasty catheter: a validation study
| Autor: | Mark Englehardt, Rodney A. Johnson, Robert A. Vogel, Helen Scott, Lisa W. Martin, Shawn W. Robinson, Glenn J. Beauman |
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| Rok vydání: | 1991 |
| Předmět: |
medicine.medical_specialty
Hemodynamics Indicator Dilution Techniques Femoral artery Balloon Flow measurement Dogs medicine.artery Coronary Circulation Medicine Animals Angioplasty Balloon Coronary business.industry Electric Conductivity Reproducibility of Results Blood flow Equipment Design Surgery Coronary arteries Femoral Artery Catheter medicine.anatomical_structure Glucose Regional Blood Flow Circulatory system Cardiology and Cardiovascular Medicine business Microelectrodes Biomedical engineering |
| Zdroj: | American heart journal. 121(3 Pt 1) |
| ISSN: | 0002-8703 |
| Popis: | An angioplasty catheter was developed to allow measurement of absolute coronary blood flow during interventional procedures. This method uses electrical impedance changes induced by a 0.5 ml bolus of 5% dextrose solution and indicator-dilution principles. The indicator is injected through a port located just proximal to the dilating balloon and the resulting changes in blood impedance are measured by electrodes at the catheter tip. Excellent linear correlations were found between known flow in 2 to 4 mm to diameter plastic tubes and catheter measurements (r = 0.99) and between timed collection canine femoral artery flow and catheter measurements (r = 0.97). Final validation was performed in canine coronary arteries using electromagnetic flowmeter data as the standard (r = 0.94). Thus accurate clinical determination of absolute coronary blood flow can be accomplished using this relatively inexpensive and simple catheter technique. |
| Databáze: | OpenAIRE |
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