Key result
Slow heart rates in aortic insufficiency are linked to ~71% greater backflow versus faster rates.
Why the study?
Does heart rate affect the measurement of aortic insufficiency backflow using a dye-dilution technique in patients with aortic insufficiency?
Observational (n=3)
Does heart rate affect the measurement of aortic insufficiency backflow using a dye-dilution technique in patients with aortic insufficiency?
Dye-dilution techniques may overestimate aortic insufficiency backflow at slower heart rates due to the development of laminar flow late in diastole.
Answers are grounded in this paper and cite their sources.
May overestimate aortic insufficiency severity at slow rates by dye dilution; leaves open need for rate-specific calibration.
Measurements of the distance a labeled particle of blood travels back up the descending aorta during a single diastole have been carried out at two different heart rates in each of three patients with aortic insufficiency. From these measurements, the ratios of back flow per unit time at the slow heart rate to backflow at the faster heart rate were found to be 1.61, 1.71, and 1.75. From an analysis of the hemodynamic factors involved, it seems likely that backflow is overestimated at the slow heart rates by this technique due to the development of laminar flow late in diastole.
No takes yet. Share an insight, caveat, or question.
Warner et al. (1961) conducted an observational in Aortic insufficiency (n=3). Slow heart rate vs. Faster heart rate was evaluated on Ratio of back flow per unit time at slow heart rate to backflow at faster heart rate (1.61, 1.71, and 1.75). Slow heart rates in patients with aortic insufficiency were associated with 1.61 to 1.75 times greater measured backflow per unit time compared to faster heart rates.
Synapse has enriched 10 related papers. Consider them for comparative context: