0000000000851177
AUTHOR
Dietrich Baumgart
Tomographic left ventricular volume determination in the presence of aneurysm by three-dimensional echocardiographic imaging. I: Asymmetric model hearts
To improve the accuracy of measurements of left ventricular volume in the presence of an aneurysm, we used three-dimensional echocardiographic imaging to analyze the shape of left ventricles in 23 asymmetric model hearts with eccentric aneurysms of different sizes, shapes, and localizations. A standard 3.75 MHz ultrasound probe with a rotation motor device was used to obtain a three-dimensional data set. By rotating the probe stepwise 1 degree, 180 radial ultrasound pictures were digitized. On the basis of the three-dimensional data set, the following parameters were determined and compared with the dimensions of the model hearts obtained by direct measurement: total left ventricular volume…
High-Frequency Rotational Angioplasty
In 19 patients with significant coronary artery disease, PTCR was used instead of PTCA. The PTCR was successful in all patients, but in nine patients additional PTCA was successfully performed. Coronary luminal narrowing could be reduced from 78 ± 19% to 32 ± 14% after rotablation and by combined treatment to 21 ± 14%. Only in one patient did coronary dissection occur; the patient was sent to surgery and had an uneventful outcome. No vessel perforation was observed. In one patient peripheral diagonal branch occlusion occurred. All vessels were open according to 24-control coronary angiography. Restenosis (>70% stenosis) occurred in 4/15 patients controlled after 6 months, mainly in those wi…
Comparison of myocardial perfusion reserve before and after coronary balloon predilatation and after stent implantation in patients with postangioplasty restenosis.
Background Stents provide a scaffold for coronary arteries after angioplasty and inhibit elastic recoil. Methods and Results In 25 patients with postangioplasty restenosis of the left anterior descending artery, ECG-gated digital subtraction coronary angiograms were recorded at baseline and during hyperemia (12 mg papaverine IC) before and after balloon predilatation (PTCA), after implantation of a Palmaz-Schatz stent, and after 6 months. Densitometric evaluation revealed different time and density parameters to calculate two definitions of myocardial perfusion reserve (MPR1 and MPR2) and maximum flow ratio (MaxFR). Poststenotic MPR1 increased from 1.57±0.14 to 2.59±0.86 after PTCA and to …