PubMed Health⌕ Search

Biomedical subjects

A Mettenleiter

Publications and source records attributed to A Mettenleiter.

6 recordsLinked to original sources
PubMed2001

[Adam Christian Thebesius (1686-1732) and the discovery of the Vasa Cordis Minima].

In first years of the 18th century, Raymond Vieussens (1635-1713) and Adam Christian Thebesius (1686-1732) discovered the Vasa cordis minima, today known as Vasa Thebesii; in 1868, Odilon Marc Lannelongue (1840-1911) described the so-called crypts of Lannelongue in the right atrium. The present study gives a historical survey over the research on the cardiac vascularization before 1700 and presents these three authors and their works on the Thebesian vessels with a biographical introduction and a commented translation. As for the biography of the Silesian anatomist Thebesius large, mostly inedited materials from Polish archives and from family archives were studied, among them, poems, a handwritten biography and a pedigree of the family. A schedule tables the studies and articles on the Thebesian vessels and the Thebesian valve published since 1708. As a commentary to the bibliography, the present stage of knowledge on the Thebesian vessels is shortly summarized. Although a compensatory function of the Thebesian vessels in coronary sclerosis and other pathological conditions has been discussed repeatedly, methodical difficulties still do not allow a reliable judgement on the role of the Thebesian vessels in physiological and pathological conditions. This study shows the contradictory results and summarizes all statements which have been published on the embryology, comparative anatomy, macroscopical and (electron-)microscopical anatomy, physiology, pathophysiology and cardio-surgery. The aim is to encourage an interdiscplinary discussion on the base of the thorough literature study.

Anatomy↗
PubMed1999

[Not Available].

Explore the source record for details and available documents.

Anatomy, Artistic↗
PubMed1998

Effects of chronic dietary creatine feeding on cardiac energy metabolism and on creatine content in heart, skeletal muscle, brain, liver and kidney.

Little is known about the regulation of total creatine concentration in heart, skeletal muscle, brain, liver and kidney in response to increased dietary creatine intake. The phosphorylated fraction of intracellular creatine (phosphocreatine) remain relatively constant, and therefore, higher intracellular creatine levels may increase the energy reserve of the heart [phosphocreatine and phosphoryl transfer via creatine kinase (CK)] and of other organs. To test the effect of supplying exogenous creatine on the myocardial energy reserve and on creatine content of various organs, rats were given chow containing 0 (Untreated), 1, 3, 5, or 7% (of diet weight) creatine for ;40 days. Thereafter, hearts were perfused and left ventricular developed pressure and heart rate were recorded. High-energy phosphate concentrations were determined with 31P-NMR spectroscopy, CK reaction velocity by 31P-magnetization transfer. Total creatine was determined in heart, skeletal muscle, brain, liver, kidney and serum by high-performance liquid chromatography (HPLC). Creatine feeding increased serum creatine by 73% (1% creatine), 142% (3%), 166% (5%) and 202% (7%). In the heart, increased serum creatine levels did not affect mechanical function; ATP, phosphocreatine, inorganic phosphate, CK reaction velocity and total creatine were all unchanged. Total creatine also remained constant in brain and skeletal muscle, while creatine content increased 4.6-fold in the liver and 1.9-fold in the kidney. We conclude that myocardial energy reserve via CK cannot be increased by exogenous creatine treatment.

Adenosine Triphosphate↗
PubMed1998

[Not Available].

Explore the source record for details and available documents.

Germany↗
PubMed1995

Atrial veins of the human heart.

Modern anatomical description divides the cardiac veins into two groups: tributaries of the greater cardiac vascular system (GCVS) and tributaries of the smaller cardiac vascular system (SCVS), consisting of the Thebesian vessels. Both systems intercommunicate extensively. With the exception of the oblique vein of the left atrium (Marshall's vein), veins draining the walls of both the left and right atrium have not been well illustrated or described in anatomical atlases and textbooks. Consequently, we do not know exactly to which of the two groups (GCVS or SCVS) the atrial veins belong. There are three groups of left atrial veins: (1) tributaries of the left coronary vein and the coronary sinus; (2) special veins draining the right-sided walls of the left atrium that terminate via intramural sinuses in the right atrium, which vessels occur in 92% of cases and belong to the GCVS; (3) in 81% of cases special veins drain the myocardium of the posterior and superior walls of the left atrium. In most cases they empty into the left atrium itself; in almost 40% of the cases they are connected with mediastinal veins. These veins, also belonging to tributaries of the GCVS, constitute a distinctly separate category of cardiac veins and should be designated proper veins of the left atrium. The veins draining the walls of the right atrium fall also into three groups: (1) In most cases there are short or large intramural tunnels or sinuses in the basic walls of the auricle and atrioventricular node area. The generally valveless openings of all the venous tunnels and sinuses are lined up on a circle just above the tricuspid valve and between the openings of both venae cavae. (2) There are also thin veins at the junction of the right atrium with both the superior and inferior vena cava. (3) In addition, there are numerous cardiac veins of the "smallest size" (real Thebesian veins).

Aged↗