Breakdown of the giant spin model in the magnetic relaxation of the Mn6 nanomagnets.

We study the spin dynamics in two variants of the high-anisotropy Mn6 nanomagnet by inelastic neutron scattering, magnetic resonance spectroscopy and magnetometry. We show that a giant-spin picture is completely inadequate for these systems and that excited S multiplets play a key role in determining the effective energy barrier for the magnetization reversal. Moreover, we demonstrate the occurrence of tunneling processes involving pair of states having different total spin.

Prediction of 24 h, nonfatal complications in patients with acute myocardial infarction receiving thrombolytic therapy by calculation of the ST segment deviation score.

Objective: To assess whether the sum of ST segment elevation and depression (ST segment deviation score [SUMSTdev]) is a better predictor for 24 h, nonfatal complications in patients with acute myocardial infarction (MI) than the sum of ST segment elevation (SUMSTelev) alone in the admission electrocardiogram.

Methods: Patients with acute MI receiving thrombolytic therapy were observed and ST scores were evaluated. Nonfatal, 24 h complications were defined as acute congestive heart failure or severe rhythm disturbances within 24 h after the start of thrombolysis.

["Inappropriate" thrombolysis in suspected myocardial infarct].

Thrombolysis in patients with suspected acute myocardial infarction (MI) without increase of cardiac enzymes (i.e. creatine kinase) above the normal level is a rare phenomenon which is not well described in the literature.