QCD Coupling from a Nonperturbative Determination of the Three-Flavor Λ Parameter.

We present a lattice determination of the Λ parameter in three-flavor QCD and the strong coupling at the Z pole mass. Computing the nonperturbative running of the coupling in the range from 0.2 to 70 GeV, and using experimental input values for the masses and decay constants of the pion and the kaon, we obtain Λ_{MS[over ¯]}^{(3)}=341(12)  MeV.

[Severe hemolytic anemia after mitral valvuloplasty].

A patient with mitral insufficiency is described who developed severe hemolytic anemia six months after mitral valvuloplasty. Various laboratory tests suggested that the cause of the hemolysis was mechanical. A second heart operation was therefore performed which revealed intact valve function.

The effect of a new calcium antagonist (Ro 11-1781) on the cardiac conduction system in man.

Using His bundle electrograms and atrial pacing the effects of Ro 11-1781, a new calcium antagonist, was studied in 13 patients with normal A--V conduction. Following an intravenous bolus of 2 mg/kg Ro 11-1781 the A--V nodal conduction time (A--H interval) was prolonged in all patients during sinus rhythm, atrial incremental and premature pacing. Wenckebach periods above the bundle of His occurred at lower atrial driving rates following the drug.

[Serious hemolytic anemia after mitral valvuloplasty].

A patient with mitral insufficiency is described who developed severe hemolytic anemia six months after mitral valvuloplasty. Various laboratory tests suggested that the cause of the hemolysis was mechanical. A second heart operation was therefore performed which revealed intact valve function.

[The effect of Ro 11-1781, a calciumantagonist, on atrioventricular conduction (author's transl)].

The effect of an intravenous bolus of 1 mg/kg Ro 11-1781, a new calciumantagonist, on sinus node automaticity and intracardiac conduction was studied by His-bundle electrography and atrial stimulation. During sinus rhythm, no significant action of Ro 11-1781 on rate, P-A-interval, A-H interval, and H-V-interval was observed. The sinus node recovery time remained unaltered.