RESUMO
Dynamic diffraction of an x-ray plane wave by a multilayer mirror modulated with a transverse acoustic wave is analyzed on the basis of rigorous multiwave mode theory. Particular attention is given to the case when λs > τ. where λs is the acoustic wavelength and τ is the extinction length. It has been derived that with increasing sound amplitude, splitting arises in every point of the kinematic branch interaction for both λs < τ and λs > τ. Accordingly the rocking curve takes the form of separate rows of peaks of Bragg diffraction into separate orders, the widths of the peaks being smaller than the width of the Bragg mirror image without modulation. The widths decrease with increasing modulation amplitude.
RESUMO
The analgesic effect of intrapleural administration of local anesthetics (lidocaine, trimecaine, azocaine) has been studied in 180 patients after thoracic surgery and with chest trauma. The effect was assessed on the basis of subjective (visual analogue 10-score scale) and objective findings (hemodynamic parameters, spirograms, ECG). In control patients analgesia was performed by intramuscular promedol administration. It has been shown that fractionated intrapleural administration of local anesthetics is an effective and safe analgesic technique after thoracic surgery and in chest trauma.
