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- W2068408094 abstract "<h2>Abstract</h2><h3>Background</h3> Invasively measured maximum increase in left ventricular pressure (LV dP/dt<sub>max</sub>) has been used to assess biventricular (BiV) pacing. We quantified extracardiac factors contributing to its variability, and developed a protocol to minimize these effects in an acute pacing experiment. <h3>Methods and Results</h3> Continuous pressure was recorded by a guidewire sensor placed in the LV. Four to six test pacing interventions were performed, each repeated 3 times and followed by a baseline pacing configuration. Maximum increase in LV dP/dt<sub>max</sub> from any measurement of BiV pacing was median 20.3% in 25 patients, compared with BiV pacing off. When directly comparing sequential measurements with BiV pacing on and off, median increase was 7.4%. Noncardiac sources of modulation included respiratory variation (6.4%), drift from first to last baseline measurement (5.0%), and discrepancy among repeated recordings of the same pacing intervention (3.3%). Comparing test interventions to interleaved baseline measurements reduced discrepancy among recordings to 2.1%; <i>P</i> < .001. <h3>Conclusions</h3> With repeated measurements of baseline state, and by comparing test interventions only to baseline measurements performed before and after, it is possible to minimize extracardiac factors and focus on the effects of test pacing interventions." @default.
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- W2068408094 date "2014-05-01" @default.
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- W2068408094 title "Design of an Acute dP/dt Hemodynamic Measurement Protocol to Isolate Cardiac Effect of Pacing" @default.
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- W2068408094 doi "https://doi.org/10.1016/j.cardfail.2014.01.020" @default.
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