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Biomedical subjects

M V Helzel

Publications and source records attributed to M V Helzel.

At least 19 recordsLinked to original sources
PubMed1993

[Real-time flow--determination of inferior vena cava on 2 different levels using RACE pulse sequence in MRI. Assessment of the total hepatic vein flow volume as an indirect parameter of liver perfusion].

A new and simple parameter for quantitative evaluation of liver perfusion is outlined: post-sinusoidal quantitative measurement of the entire liver venous flow: This is a result of the differences in evaluated flow volumes at two different levels in the inferior V. cava. The first level ist the height of diaphragm, and the second is situated just cranial of the renal vessels. Normal values obtained from a group of healthy volunteers are presented. A gradient-echo pulse sequence called RACE, enabling flow measurements in real-time, is outlined.

Adult↗
PubMed1993

[Ingestive contrast medium (sonographics) in abdominal ultrasonography. In-vitro and in-vivo studies].

In-vitro tests of new ingestive contrast media (known as "sonographics") are reported. A catalogue comprising 6 points for standards of an "ideal" sonographicum is outlined by systematic comparison to echogenicity of liver parenchyma in n = 49 healthy persons. Preliminary clinical tests show significant improvement of diagnostics in the upper abdomen; however problems do exist in the evaluation of these contrast media, too: Different echogenicities of sonographics can serve variable aims in diagnostic ultrasonography. Simultaneous application of several transducers may enable complete cross-sections of the human torso as in CT, based on further evaluation of ingestive contrast media.

Adult↗
PubMed1990

[The estimation of blood circulation parameters using imaging techniques--comparison with measurements made using the Swan-Ganz catheter].

Circulation can be evaluated by means of measuring parameters in X-ray-thorax and ultrasonography. Changes in haemodynamics can be estimated by measured changes in width of vena azygos. Additional sonography of systemic veins of thoracic inlet (V. jugularis interna, V. cava inferior) improves multiple correlation to circulating blood volume up to r = 0.81. Supine or erect position and type of ventilation are influencing factors. Diaphragm motility was measured by means of ultrasonography: patients with assisted ventilation showed significantly decreased motility compared to patients with spontaneous breathing.

Adult↗
PubMed1989

[A new 2-compartment catheter for controlled drainage of hepatic venous blood to the extracorporeal space].

A new therapeutic catheter designated as "2-compartment-catheter by Helzel" for on-target hepatic vein blood drainage to extracorporal space, without blocking the caval blood flow to the right atrium, is presented. Its principle of action is outlined. First experiences in animals are reported. Using 2 additional catheters, isolated liver perfusion by "pure catheter technique"--without laparotomy--is now possible for various therapeutic approaches.

Animals↗
PubMed1989

[Pulmonary segmental artery angiography in intensive care patients].

The indication for wedge angiograms in intensive-care patients within the scope of X-ray chest examination is outlined. The obligatory wedge angiogram in patients with Swan-Ganz catheter is redundant. 4 indications for this special examination are specified. As a new possibility for differentiating between the ventral or dorsal course of pulmonary vessels, an inverse ratio of arborization angles is outlined for the first time.

Catheterization, Swan-Ganz↗
PubMed1989

[Postoperative sonography in gastrectomized patients. Correlations with gastrografin swallow. Value in the detection of complications with special reference to anastomosis insufficiency].

In a group of patients (n = 102) we compared post-total gastrectomy plus splenectomy the ranking of the postoperative Gastrografin swallow and of abdominal sonography as "bedside" methods. There was no correlation in respect of proof of anastomotic insufficiency on the one hand and detection of free abdominal fluid on the other. No other imaging method visualises morphological details of the anastomosis to the same degree as the Gastrografin swallow. The water-soluble contrast medium used so far appears to be in need of improvement in respect of "x-ray density", viscosity and osmolarity, the more so since the danger of aspiration is high in the postoperative, debilitated patient. The first ranking of sonography is due to its ability to detect free abdominal fluid and pathological findings in the abdominal walls. The postoperatively formed "neo-compartments" in the peritoneal cavity in the upper abdomen render the classification of pathological findings as belonging to certain organ structures even more difficult. Ultrasound supplies important additional information in respect of the position of peritoneal drainages and also concerning the basal thoracic segments that are important in x-ray film of the thorax. Sonographic monitoring of the drainage of abscesses is possible. In the synopsis of both methods, further diagnostic measures (CT, leucocyte scan) are only rarely necessary (3% of the cases).

Abdomen↗
PubMed1989

[ECG-controlled placement of central venous catheters in patients with atrial fibrillation].

Some workers state that sinus rhythm is essential for electrocardiographic placement of central venous catheters. We performed a prospective study to compare location control by ECG and by chest X-ray in 40 patients with absolute arrhythmia and atrial fibrillation. The criteria accepted as allowing the assumption of an intracardiac position of the catheter tip were: (1) Abrupt appearance of high-voltage P-waves when the right atrium (RA) was entered and their brisk disappearance when pulling the catheter back into the vena cava superior (VCS) and/or (2) a change in configuration and voltage of the QRS complex on withdrawal of the catheter from the right ventricle (RV). After establishment of an intracardiac position, the catheter was withdrawn until the ECG changed to show a trace identical to that seen before it had entered the heart. Then, in this study, the correct central venous position was confirmed by chest X-ray. The intravascular ECG revealed a correct placement of the catheter tip in the VCS in all patients but one. In this patient who had severe dysrhythmia, an intracardiac ECG could not be obtained, although the chest X-ray showed a correct position of the catheter in the VCS. While false-negative results (where an intracardiac catheter position cannot be documented although the catheter is in a central venous position) occasionally do occur, false-positive results (with ECG suggesting an intracardiac location read, though the catheter tip is actually in a peripheral vein) are virtually impossible.(ABSTRACT TRUNCATED AT 250 WORDS)

Atrial Fibrillation↗
PubMed1989

[The spastic pelvic floor syndrome: definition in the double-exposure defecogram].

Double-exposure defaecography and the so-called pinching test improve conventional defaecography in the diagnosis of functional rectal outlet disorders. In particular, the pinching test makes quantitative evaluation of the m. puborectalis possible. "Spastic pelvic floor syndrome" is defined by quantitative parameters in double-exposure defaecography and the pinching test.

Defecation↗
PubMed1988

[Double-exposure defecography following perineal sphincteroplasty].

A new diagnostic method is presented as "Double-Exposure Defaecography". Its advantage is the reliable evaluation of functional parameters of defaecography without the aid of obligatory auxiliary lines in relation to the drawing of the relevant skeletal parts. Less display and effort are needed than in cineradiography. The so called pinching test allows functional, quantitative examination of musculus puborectalis. The evaluation is performed on double-exposed x-ray films. Besides a group of patients suffering from anorectal incontinence and difficulties in defaecation (n = 42), a group of patients (n = 21) with smooth-muscular perineal sphincter replacement was controlled by double-exposure defaecography. This fairly new method of surgery restores continence in 80% of the cases.

Anal Canal↗
PubMed1988

[Typical sonographic findings in hemihepatectomized or partially hepatectomized patients].

The frequency of postoperative complications following immediately and at intervals after hepatic surgery, is evaluated by ultrasonography in 29 patients. In addition, the following sonographic findings--not mentioned upto now in literature--are pointed out: Enlargement of the typical cross-section of the vena cava and especially pseudotumorous vault of the parenchyma of the liver versus lumen of the vena cava; the latter may produce difficulties in discriminating local relapses in paracaval liver segments. Sclerosis of great liver veins with wall-like echoes in portal veins. After right hemihepatectomy, the portal vein could be identified by ultrasonography in only 50% of the cases. Transient oedema of the gallbladder wall and periportal fields. Tortuosity of intrahepatic vessels in the immediate postoperative course; especially after resection of great tumours of more than 7.5 cm diameter.

Female↗