Application Experiences on a GPU-Accelerated Arm-based HPC Testbed.

This paper assesses and reports the experience of ten teams working to port, validate, and benchmark several High Performance Computing applications on a novel GPU-accelerated Arm testbed system. The testbed consists of eight NVIDIA Arm HPC Developer Kit systems, each one equipped with a server-class Arm CPU from Ampere Computing and two data center GPUs from NVIDIA Corp. The systems are connected together using InfiniBand interconnect.

Identifying the linear phase of the relativistic Kelvin-Helmholtz instability and measuring its growth rate via radiation.

For the relativistic Kelvin-Helmholtz instability (KHI), which occurs at shear interfaces between two plasma streams, we report results on the polarized radiation over all observation directions and frequencies emitted by the plasma electrons from ab initio kinetic simulations. We find the polarization of the radiation to provide a clear signature for distinguishing the linear phase of the KHI from its other phases. During the linear phase, we predict the growth rate of the KHI radiation power to match the growth rate of the KHI to a high degree.

Minimally invasive coronary revascularization in elderly patients.

Background: Internal mammary artery to left anterior descending coronary artery anastomosis can be done without extracorporeal circulation on the beating heart. This method seems to have particular advantages for elderly patients, those 70 years old or older.

Methods: From January 1, 1997, to October 31, 1997, 27 patients have been operated on with a minimally invasive approach through a left-sided minithoracotomy.

Anabolic steroids (metenolone) improve muscle performance and hemodynamic characteristics in cardiomyoplasty.

The loss of force and mass in the conditioned latissimus dorsi muscle are principal reasons for the poor improvement in hemodynamic functioning attained by cardiomyoplasty. Using 24 sheep, we investigated the effect of anabolic steroids on the hemodynamic, histologic, and myophysiologic characteristics in the setting of cardiomyoplasty. In 12 of the animals (group A), the latissimus dorsi muscles were electrically conditioned with an Itrel pulse generator; in the remaining 12 animals (group B), the electrical conditioning was combined with the administration of an anabolic hormone (metenolone; 100 mg/week).

Effect of an anabolic steroid (Metenolon) on contractile performance of the chronically stimulated latissimus dorsi in sheep.

In 12 sheep the left latissimus dorsi muscles (LD) were conditioned by chronic electrostimulation with a pulse generator (Itrel, Medtronic). Six animals (group B) received a weekly intramuscular injection of an anabolic steroid (Metenolon). After 14 weeks the contraction parameters of the left LDs (group A and B) and right LDs (control group) were investigated.

[The effect of timing of surgical intervention on fatality of acute endocarditis].

Between 1/1986 and 5/1992 a total of 5283 surgical procedures involving extracorporal circulation were performed at our clinic, including 44 patients who underwent a total of 54 operations for acute endocarditis. On the basis of a retrospective study, this paper presents the pre-operative findings and the results of surgery in relation to the duration of the case history. Pathogenic microorganisms were successfully grown from the blood cultures of 63.

[The incidence of wound healing disorders in heart surgery].

In a five-year retrospective study we investigated the wound infection rate after median sternotomy in 2805 adult patients on whom elective surgery had been performed with extracorporeal circulation. On the basis of 14,700 apparently relevant data from 101 patients with wound healing disturbances at the sternotomy site, both the significance of predisposing risk profiles and the prevalence of nosocomial pathogens were evaluated. The control group was formed by 100 patients selected at random.

[Heart surgery interventions in patients with terminal renal failure].

It is reported on first own experiences in the cardiosurgical treatment of patients with terminal renal insufficiency. Frequency of cardiovascular complications and their high lethality in this group of disease force into early and routine use of cardiological diagnostics and cardiosurgical therapy. The surgical indication should exclusively be based on the severity of the present heart disease.

[Arteriovenous fistula in the tabatière region--primary shunt in chronic hemodialysis].

The number of patients with end-stage renal disease treated by chronic hemodialysis is permanently increased. An assumption of a long-term and successful treatment is the durable functioning vascular access. The method of choice worldwide is the typical Cimino fistula on the distal forearm, but a more peripheral arterio-venous fistula is possible.

[Peripheral venous pressure in acute and chronic femoral-pelvic vein occlusion--an experimental study].

The behaviour of the peripheral venous pressure was checked after starvation of the venous main vessel of the pelvic limb in 34 mongrel dogs in long-term course about 40 weeks. The influence of recanalisation processes on the pressure development was excluded by the ligature model. The pressure measurements took place continuously statically and dynamically in horizontal and in oblique posture.

[Arterial reconstructions spanning the knee joint].

Knee-joint crossing arterial repair is an alternative solution for patients whose extremities otherwise might have to be amputated. Indications are according to Fontaine for Stages III and IV. Specialised angiographic preparatory examination and knowledge of microsurgical techniques are required.

[Surgery of leg and pelvic venous thrombosis].

33 patients suffering from crural-pelvic venous thrombosis and having been treated surgically were now followed-up. The late results obtained were satisfactory.

[Transluminal angioplasty in combination with surgical procedures in arteriosclerotic occlusive disease of the lower extremity (author's transl)].

In 16 patients suffering from occlusions of the pelvic and/or femoral arteries a combined treatment was performed: percutaneous transluminal angioplasty (PTA) and surgical reconstructive measures. Indications for this procedure are: 1. Stenoses of the pelvic arteries and occlusion of the ipsilateral superficial femoral artery with PTA for the iliac artery and endarterectomy for the femoral artery.

[Shunting procedures in portal hypertension in children (author's transl)].

31 children aged 2,5 to 14 years suffering from portal hypertension underwent shunting operations (cavosplenal and cavomesenteric anastomoses). The follow-up period covers 2 months to 8 years. Patent anastomoses could be demonstrated in 26 patients.

[Surgical treatment of segmental occlusions of the popliteal and the crural arteries with modified vascular prostheses (author's transl)].

Possibilities and indications for reconstruction of the femoro-popliteal and femoro-crural region are dealth with. Autogenous veins still are the favoured graft material for the femoro-popliteal/crural bypass. If an autogenous vein is not available bovine arterial grafts, Gore-Tex-PTFE prostheses or modified human umbilical cord vein are alternative materials.

[Differential diagnosis of acute leg swelling (author's transl)].

Reference is made to aspects relating to the aetiology of acute leg swelling following surgical or radiological treatment of uterine and ovarian tumours. Four cases are reported, in that context. The swellings described developed up to ten years after initial therapy.

[Postoperative prophylaxis of thromboembolism. Present position.(author's transl)].

Only anti-coagulators and aggregation-stoppers may be said to be the medicamental prophylaxis of thromboembolism. The Cumarin-Indandion group is burdened with continuous laboratory controls. Contraindications excluding a general prophylaxis for this group as well as for Heparin and ASS exist.