The objective of this study was to determine the relation between left ventricular(LV) systolic function and the ratio of preceding(RR1) to prepreceding(RR2) R-R intervals in patients with chronic atrial fibrillation(...The objective of this study was to determine the relation between left ventricular(LV) systolic function and the ratio of preceding(RR1) to prepreceding(RR2) R-R intervals in patients with chronic atrial fibrillation(AF) and dilated cardiomyopathy. LV systolic function(Emax)was examined using a conductance catheter with a micromanometer in 13 patients with chronic AF and dilated cardiomyopathy. We calculated Emax as a load-indepen- dent index of LV contractility and compared it with RR1, RR2, and the ratio of RR1/RR2. We analyzed 50± 13 cardiac cycles(range 18-61) in each patient. Average heart rate was 80± 13 beats/min, and ejection fraction over all cardiac cycle in each patient measured by conductance catheter was 31± 8% . Emax was positively correlated with RR1 and RR1/RR2 in all patients, and negatively correlated with RR2 in all patients. In each patient, correlation coefficients of Emax with RR1/RR2 were greater than those with either RR1 or RR2. Furthermore, Emax at RR1/RR2=1 in the linear regression line reflected average Emax over all cardiac cycles in each patient. In conclusion, we have shown that LV contractility correlated positively with RR1/RR2 in patients with chronic AF and dilated cardiomyopathy, and LV contractility at RR1/RR2=1 represents the average value of contractility over all cardiac cycles.展开更多
Giant sacclar aneurysm in a coronary-pulmonary artery fistula is extremely rare. In this article, we presented two cases of giant aneurysms in coronary-pulmonary artery fistula with atherosclerosis.
文摘The objective of this study was to determine the relation between left ventricular(LV) systolic function and the ratio of preceding(RR1) to prepreceding(RR2) R-R intervals in patients with chronic atrial fibrillation(AF) and dilated cardiomyopathy. LV systolic function(Emax)was examined using a conductance catheter with a micromanometer in 13 patients with chronic AF and dilated cardiomyopathy. We calculated Emax as a load-indepen- dent index of LV contractility and compared it with RR1, RR2, and the ratio of RR1/RR2. We analyzed 50± 13 cardiac cycles(range 18-61) in each patient. Average heart rate was 80± 13 beats/min, and ejection fraction over all cardiac cycle in each patient measured by conductance catheter was 31± 8% . Emax was positively correlated with RR1 and RR1/RR2 in all patients, and negatively correlated with RR2 in all patients. In each patient, correlation coefficients of Emax with RR1/RR2 were greater than those with either RR1 or RR2. Furthermore, Emax at RR1/RR2=1 in the linear regression line reflected average Emax over all cardiac cycles in each patient. In conclusion, we have shown that LV contractility correlated positively with RR1/RR2 in patients with chronic AF and dilated cardiomyopathy, and LV contractility at RR1/RR2=1 represents the average value of contractility over all cardiac cycles.
文摘Giant sacclar aneurysm in a coronary-pulmonary artery fistula is extremely rare. In this article, we presented two cases of giant aneurysms in coronary-pulmonary artery fistula with atherosclerosis.
