Jens P Hering

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During ventricular fibrillation, myocardial hemodynamic and metabolic effects of percutaneous cardiopulmonary support (PCPS) were analyzed in 11 adult sheep (body weight 77-112 kg). During supported fibrillation, an abrupt increase in left-ventricular pressures with alignment to aortic pressures was observed in 2 animals, which was probably due to(More)
This paper studies the series of 22 test runs performance for bearing damage assessment due to inverter-induced bearing currents. The influence of bearing current amplitude and type, calculated apparent bearing current density, time of operation, and inverter switching frequency on bearing damage was investigated. The degree of electrical bearing stress W(More)
The efficacy of the new cable-driven rotating left ventricular assist device Hemopump in cardiogenic shock was examined in experiments with adult sheep (n = 14; body weight 50-71 kg). Shock was induced by high frequency ventricular pacing. Aortic, pulmonary, central venous and left ventricular pressures as well as electromagnetic measurements of coronary(More)
A study was designed to quantify the influence of the Hemopump on myocardial metabolism in regional myocardial ischemias induced by repetitive balloon-occlusions (3.5 minutes) of the LAD in 12 sheep (b.w. 49-61 kg). In order to make immediate comparisons and obtain paired-couples, ischemias were carried out with and without the Hemopump in operation. An(More)
The Hemopump is a new left-ventricular assist device (21 F diameter), which provides up to 3.5 L/min output after placement in the left ventricle via the femoral artery. We describe the first case in which the device was inserted during resuscitation. The patient developed untreatable sustained ventricular tachycardias/fibrillation 40 hours after coronary(More)
BACKGROUND In cardiac arrest, use of percutaneous cardiopulmonary bypass support (PCPS) may lead to left ventricular loading, with deleterious effects on the myocardium, and is often accompanied by an increase in pulmonary artery pressure. The present study was designed to assess the potential of artificially induced pulmonary valve incompetency to(More)
Afrocanarian blue tits (Cyanistes teneriffae) have a scattered distribution on the Canary Islands and on the North African continent. To date, the Canary Islands have been considered the species' main Pleistocene evolutionary center, but their colonization pathways remain uncertain. We set out to reconstruct a dated multi-gene phylogeny and ancestral ranges(More)
Statements on the mechanism of the endangerment of bearings due to inverter-induced bearing currents nearly do not exist today. Therefore, a series of 22 test runs for bearing damage assessment was carried out. The influence of bearing current amplitude and type, calculated apparent bearing current density, time of operation and inverter switching frequency(More)
In moderate hypothermia, three different concepts of pH management have been described to date: pH-stat, alpha-stat, and alkalinity. In our study these pH strategies were compared in adult sheep, with animals serving as their own controls for direct comparability. Hemodynamic parameters, such as mean aortic pressure (from 109 +/- 12 to 72 +/- 23 mm Hg),(More)
A method was developed to quantify the intensity of tissue staining using a CCD (charge-coupled device) camera. Reflection spectra of NBT-stained (nitro-blue tetrazolium-stained) and unstained myocardium were recorded via fibre optics coupled to a CCD camera, connected to a microcomputer. The calculation of the intensity of staining was based on evaluation(More)