Biomedical subjects

M Eisenhauer

Publications and source records attributed to M Eisenhauer.

3 recordsLinked to original sources

PubMed2001

Coronary angiography using 4 Fr catheters with acisted power injection: A randomized comparison to 6 Fr manual technique and early ambulation.

Coronary angiography using 4 Fr catheters may reduce access site complications, promote better utilization of outpatient facilities, but at a cost of suboptimal image quality. To determine whether 4 Fr diagnostic angiography with power injection (Acist, Minneapolis, MN) was equivalent to 6 Fr manual technique, 101 unselected patients were randomized to transfemoral coronary angiography with 4 or 6 Fr catheters. Procedural characteristics, angiographic quality scores, and results of 90 min ambulation were analyzed. Coronary angiographic quality scores using 4 Fr and 6 Fr catheters were equivalent (left coronary artery 4.73 +/- 0.6 vs. 4.80 +/- 0.65, P = 0.28; right coronary artery 4.98 +/- 90.13 vs. 4.97 +/- 0.16, P = 0.48). However, 4 Fr left ventriculographic image score was lower (4.53 +/- 0.68 vs. 4.83 +/- 0.42, P = 0.0002), attributed, in part, to a smaller injected contrast volume (32 +/- 11 vs. 37 +/- 4 mL, P = 0.001). The total study contrast volume was significantly less in the 4 Fr group (119 +/- 35 vs. 159 +/- 52 mL, P = 0.001). Complications related to early ambulation at 90 min were similar and minimal in both groups. Compared to 6 Fr manual contrast injection technique, diagnostic angiography through 4 Fr catheters with power contrast injection resulted in equivalent coronary angiographic image quality, slightly reduced but diagnostic left ventricular image quality, and significantly less contrast volume. Four Fr angiography facilitates early ambulation without compromising safety and image quality.

Adult↗

PubMed1995

[Recall errors in locating cities on a map].

Three experiments investigated whether hindsight bias--a systematic distortion of the recollections of numerical estimates--is also observed with visuo-spatial material. Subjects estimated the location of 20 German cities on an empty map, received feedback about the true locations, and were then requested to recall their earlier estimates. Additionally, we tested each subject's intelligence, field dependency, and visuo-spatial abilities. In experiment 1, in which experimental and control items (i.e. those with and without feedback) were given to the same subjects, hindsight bias was observed, but only in one out of three dependent measures. The same pattern of results emerged in experiment 2, despite the use of a different mode of data collection. Experiment 3, in which experimental and control items were given to different subjects, found a strong hindsight bias in all three dependent measures. The personality features showed no correlation with the amount of individual hindsight bias. All three experiments provided evidence that hindsight bias occurs with visuo-spatial material.

Adult↗

PubMedDate not supplied

The utility of a bone scan in the diagnosis of clinical scaphoid fracture.

The incidence of true scaphoid fracture and the value of radionuclide scan was evaluated in a 1-year retrospective review of 54 emergency department patients with a preliminary diagnosis of clinical scaphoid fracture (snuff box tenderness and negative initial X-ray study). All emergency department charts of patients with a discharge diagnosis of clinical scaphoid fracture were reviewed to determine the number ultimately found to have a true scaphoid fracture and to ascertain how the diagnosis was actually achieved. All patients were managed by immobilization in a thumb spica cast for a period of 10-14 d, with repeat clinical assessment and radiographs at that time. The diagnosis of true scaphoid fracture was confirmed radiographically at the time of reassessment or, in the case of persistent tenderness and negative repeat radiographs, by the use of a technetium bone scan. In our study group, only 8 of 54 patients (14.8%) were found to have a final diagnosis of true scaphoid fracture. In 75% (6/8) of these patients, the diagnosis was made by technetium bone scans, as the radiographs remained negative at the time of reassessment. In addition, a bone scan revealed the presence of two previously unsuspected fractures (one distal radius fracture and one triquetral fracture) in two patients with continued clinical tenderness. This study confirms the previously reported low incidence of scaphoid fractures in patients with a diagnosis of clinical scaphoid fracture. It also demonstrates the importance of technetium bone scan as a diagnostic tool of increased sensitivity, as compared to traditional radiographs, in detecting the presence of scaphoid fractures and in detecting other clinically unsuspected fractures in this group of patients.

Adolescent↗