The influence of methylphenidate on the power spectrum of ADHD children - an MEG study.

Background: The present study was dedicated to investigate the influence of Methylphenidate (MPH) on cortical processing of children who were diagnosed with different subtypes of Attention Deficit Hyperactivity Disorder (ADHD). As all of the previous studies investigating power differences in different frequency bands have been using EEG, mostly with a relatively small number of electrodes our aim was to obtain new aspects using high density magnetoencephalography (MEG).

Methods: 35 children (6 female, 29 male) participated in this study.

[Mechanical sutures in esophageal surgery (author's transl)].

Hospital lethality in patients with esophagoenteral anastomosis is high: in carcinoma of the esophagus, it is about 30%; in total gastrectomy for carcinoma, it is 43.6%. In both cases, sutureline insufficiency is responsible for more than 43%.

[Surgery of esophageal cancer].

In the last 12 months 40 patients underwent surgery for carcinoma of the esophagus. In 18 cases the tumor was located in the lower third of the esophagus. An abdomino-thoracic approach was employed and a 2/3 resection of the esophagus and an esophagogastrostomy were performed.

[Experimental findings in liver perfusion measurements using an ultransonic Doppler flowmeter].

1. The ultrasonic doubling method of bloodflow measurement is an experimental easily practicable and very exactly recording measurement arrangement. By this method data of other methods were extended and ensured.

[Experimental and clinical investigations in pathophysiology of renal artery stenosis (author's transl)].

The effect of renal artery stenosis on the poststenotic hemodynamics is demonstrated and evaluated in the presented experimental and clinical investigation. It is shown that the resistance of a medium sized stenosis is small compared to the total renal resistance. The peripheral resistance which is induced by the stenosis is the essential characteristic in the pathophysiology of the renal artery stenosis and the resulting hypertension.

Comparative study of in vitro flow characteristics between a human aortic valve and a designed aortic valve and six corresponding types of prosthetic heart valves.

A model of a pulsatile cardiovascular system is described including an electronic control, a hydraulic driving unit, a volume storage, a peripheral resistance and measuring equipment. Six different artificial heart valves, a designed aortic valve (Aachen pockett valve II) and a human aortic valve have been tested in the outflow position of the pump. Three of them are presently being used in clinical applications.

[Experimental surgery in pancreas/autotransplantation (author's transl)].

We have described to technique of one stage intraabdominal heterotopic pancreaticduodenal autotransplantation which has resulted in long term survival of dogs in good health. Malnutrition related to pancreatic exocrine hypofunction occurs initially but gradual recovery by 3 months nutrition is normal. In contrast, endocrine function is well preserved throughout the postoperative period except for a few days immediately after transplantation.

[Experiences in the management of patients with ileo- and colostomy (author's transl)].

In the presented paper the management of stoma-patients has been discussed. Two topics had to be seen, first the psychological guidance of the patient and his reentry into society and second the management of the stoma itself. Beside of the sometimes unavoidable complications the patients are often molested by preventable inconviences as skin-irritation, soiling, and odors.

[Experimental studies on the circulation of the vascular area of the subdiaphragm using a newly developed pulse-wave pump].

A new developed partial artificial heart system is presented, which allows pulsatile perfusion of vital organs. The results presented reveal the possibility to duplicate pressure curves and peak systolic pressure in the perfused area-similar to physiological preoperative measurements. The kidney function remains intact.