Demonstration of ignition radiation temperatures in indirect-drive inertial confinement fusion hohlraums.

We demonstrate the hohlraum radiation temperature and symmetry required for ignition-scale inertial confinement fusion capsule implosions. Cryogenic gas-filled hohlraums with 2.2 mm-diameter capsules are heated with unprecedented laser energies of 1.2 MJ delivered by 192 ultraviolet laser beams on the National Ignition Facility. Laser backscatter measurements show that these hohlraums absorb 87% to 91% of the incident laser power resulting in peak radiation temperatures of T(RAD)=300 eV and a symmetric implosion to a 100 µm diameter hot core.

[Myocardial infarct after the acute phase--the risk of arrhythmia]. / Enfarte do miocárdio após a fase aguda--o risco arrítmico.

Upon the development, divulgation and improvement of the Ambulatory Electrocardiographic Monitoring (AEM) techniques, the problem of the arrhythmias after an acute myocardial infarction (AMI) has acquired a new acuteness. Its importance becomes clearly evident from the fact today recognized that about 10% of the patients die within the first year after AMI and that the great majority of them dies suddenly. The prognostic value of certain types of ventricular arrhythmias is now well proved to be an independent risk factor respecting to the late complications of AMI, namely the sudden death issue. In this paper, after referring the prognostic criteria for the ventricular arrhythmias, the Author proposes an AEM execution calendar for the AMI patients, since the late hospital phase (hospital discharge). Afterwards, the controversial therapeutic problem of the ventricular arrhythmias is approached, quoting the pharmacological set-backs and pointing out the AEM limitations in regard to the selection and efficacy confirmation of the anti-arrhythmic drugs. At last, a few conclusions of the "Cardiac Arrhythmia Pilot Study" (CAPS, 1986) are mentioned and an other ongoing multicenter study is referred, whose conclusions will be of capital importance to define the anti-arrhythmic therapy utility in the setting of the post-AMI patients.

[Difficulties in the diagnosis of silent myocardial ischemia using continuous ambulatory electrocardiographic monitoring--the Holter method]. / Dificuldades no diagnóstico da isquemia miocárdica silenciosa pela monitorização electrocardiográfica ambulatória contínua--método de Holter.

After a retrospective review of the silent myocardial ischemia (SMI) clinical interest and the technical evolution that enabled SMI detection and valuation over the last few years, the author reports the generic limitations of the Ambulatory Electrocardiographic Monitoring (AEM) and its specific difficulties in relation to the SMI, considering: 1. patient inherent difficulties; 2. patient ECG difficulties and 3. technical difficulties. Finally, a critical comparison between AEM and stress test utilities in the SMI setting is done and a strategy for the selection of the patients is proposed.