Investigations of the pushability behavior of cardiovascular angiographic catheters.

The placement of angiographic catheters into the vascular system is a routine procedure in modern clinical business. The definition of objective but not yet available evaluation protocols based on measurable physical quantities correlated to the empirical clinical findings is of utmost importance for catheter manufacturers for in-house product screening and optimization. In this context, we present an assessment of multiple mechanical and surface catheter properties such as static and kinetic friction, bending stiffness, microscopic surface topology, surface roughness, surface free energy and their interrelation.

Outpatient coronary angiography with 4 French catheters.

The early 4 French (Fr), pre-formed, Judkins coronary catheters had unsatisfactory maneuverability due to reduced torque stability. Technical innovations have led to improved 4 Fr catheters. This prospective study evaluates the safety and feasibility of the 4 Fr Quick Care Infinity catheter (Cordis, Miami, Florida).

Endothelium-dependent and endothelium-independent flow reserve in vascular regions supplied by the internal mammary artery before and after bypass grafting.

Objective: It was the goal of this study to compare endothelium-dependent and endothelium-independent flow reserve in vascular regions supplied by the left internal mammary artery before and after bypass graft surgery.

Methods: The native internal mammary artery in situ was investigated in 13 patients (age 61.8 +/- 8.

Angioplasty for coarctation of the aorta: long-term results.

Balloon coarctation angioplasty (BCA) was performed in seven consecutive patients (five boys and two girls) 18 months to 18 years old (mean 9.5) with isolated discrete unoperated coarctation of the aorta. A No.

[Radiation exposure of urologists].

On different positions of the body of urologists working in the field of radiology the rayage was measured by means of LiF-teflon-dosimeters. In unprotected regions of the body the radiation dose is essentially higher than under the protective clothing of lead rubber. The raying of the hands is particularly high.

[Radiation exposure to personnel in bronchology (author's transl)].

Radiation doses to hands, gonads, head and dorsum received by staff carrying out bronchological X-ray examinations have been measured using LiF/teflon dosimeters. Because of the relatively high dorsal doses, it is important for the medical personnel to face the patient exclusively with the radiation protected foreside.

[Radiation exposure to personnel during fluoroscopy in operating rooms (author's transl)].

The radiation doses to various sites of the body received by physicians and nurses during fluoroscopic work in the operating room have been measured by using LF/teflon dosimeters. The results are presented separately for skeleton and bile operation as well as implantations of cardiac pacemakers. The doses to hands, head, dorsum and gonads decrease in the given sequence.

Biological screening in the U.S. Army antimalarial drug development program.

The methods of testing drugs in the United States Army Antimalarial Drug Development Program are described. To date over two hundred thousand compounds have been screened. For each 3,000 compounds evaluated in the primary screen, only 1 is assessed for efficacy in the final test system.