A single-dipole model and a two-dipole model have been examined to approximate the electrical activity of heart; positions as well as vector components of these dipoles were estimated from the body surface potential distribution that was measured with 64 electrodes arranged on the chest. The "residue" has been defined as a measure for how much potential component is left that cannot be attribut...

Swivel walkers are being increasingly used for muscular dystrophy patients in order to prolong the period of their ambulation. Existing designs did not address the special problems of accommodating such patients comfortably and providing the easier and more assured ambulation which their weakened condition requires. The ORLAU VCG (variable centre of gravity) swivel walker has been developed so ...

概 要 肝 疾患 と心 臓 との 関係 を究明 す るため,肝 疾 患患者 のベ クト ル心電 図 を水村法(148例),Frank 法(22例)に よ り撮影 し,こ れ らと肝機 能,血 清蛋 白,血清 電解質 お よび心電図 を比較 検 討 し た. QRS,T環 最大ベ ク トルの大 きさは急 性肝 炎,慢 性肝炎,肝 硬 変症の順 に小 とな り,QRS-T夾 角 は逆 の 順 に大 とな る.ま た,QRS, T環 最大ベ ク トルの大 きさは,肝 機 能障害 の強 くな るにつ れ,ま た 血 清 蛋 白の うちγ-globulinの増加群 で小 とな る.こ の関 係は と くにT環 で著 しい. QRS-T夾 角 は逆 に大 となる.心 電図 上ST-T融 合型 を示す例 では, T環 の縮 小,QRS-T夾 角の開大 がみ られ,こ の事 よ り ST-T融合 型...

In many auction problems, we consider a selfinterested seller who is allocating item(s) to bidders in exchange for payments. The highly celebrated VCG mechanism provides an auction mechanism in this case that is efficient, strategy-proof, and ex post individually rational (IR). If the seller’s goal is to maximize revenue, alternative mechanisms include the Myerson optimal auction, which maximiz...

DESPITE several studies, no definitive criteria for the vectorcardiographic diagnosis of left ventricular hypertrophy (LVH) have been proposed. Some reports have been limited to the analysis of cases of the systolic overload type of LVH' while others have failed to define specific criteria for the diagnosis or have emphasized the wide overlap of the findings in LVH with those of the normal popu...

Twelve long-distance runners were evaluated by physical examination, electrocardiogram, vectorcardiogram, chest x-ray film, and echocardiogram; and the results were compared to the findings in 12 normal control subjects. The athletes showed a significantly higher frequency of gallop rhythms with a third or fourth heart sound. Fiectrocardiographic and vectorcardiographic abnormalities consisting...

a rather large distance. With this in mind, the authors propose a vectorcardiographic method based on a trirectangular trihedron. Comparisons are made between calculated scalar leads derived from the spatial vectorcardiogram, and real scalar leads recorded from the subject. In case of concordance the hypothesis of a single instantaneous cardiac vector within an homogeneous conducting medium is ...