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3 results

  • Chapter 23 - l-Transposition of the Great Arteries (“Corrected” Transposition)

  • from Section 4 - Complex Mixing Lesions
  • Edited by Laura K. Berenstain, James P. Spaeth
  • Book:
    Congenital Cardiac Anesthesia
    Published online:
    09 September 2021
    Print publication:
    16 September 2021, pp 158-168

  • Summary

    Levo-transposition of the great arteries is a rare anomaly, comprising less than 1% of all forms of congenital heart disease and is characterized by both atrioventricular and ventriculoarterial discordance. Despite ventriculoarterial discordance, oxygenated and deoxygenated blood flow is in the correct physiologic direction, resulting in normal oxygenation and perfusion. Patients without other structural cardiac defects are asymptomatic at birth and during early childhood and usually present later in life. The long-term sequelae of patients with uncorrected levo-transposition include right ventricular dysfunction, systemic atrioventricular valve regurgitation, congestive heart failure, arrhythmias, and complete heart block. The natural history of the disease is largely determined by the presence of associated anatomic cardiac abnormalities and the progressive dysfunction of the morphologic right ventricle as the systemic pump. This chapter details the anesthetic management of a patient with levo-transposition presenting for an urgent appendectomy, including management of a pacemaker.

  • Integrated on-chip antennas for communication on and between monolithic integrated circuits

  • Hristomir Yordanov, Peter Russer
  • Journal:
    International Journal of Microwave and Wireless Technologies / Volume 1 / Issue 4 / August 2009
    Published online by Cambridge University Press:
    29 June 2009, pp. 309-314

  • The rate of signal transmission on or between monolithic integrated circuits is limited by the cross-talk and the dispersion due to the wired interconnects. The bandwidth limitations can be overcome by wireless chip-to-chip and on-chip interconnects via integrated antennas. In this work the utilization of the electronic circuit ground planes as radiating elements for the integrated antennas has been proposed. This allows for optimal usage of chip area, as the antennas share the same metallization structure as the circuits. By exciting the interconnects between the patch areas in transmission line modes as well as in antenna modes, the interference between signals from circuit to circuit and antenna excitation signals is minimized. This has been achieved by inserting a transformer in the antenna feeding network. Examples of possible antenna and feeding structures have been investigated numerically. Scaled prototypes of the integrated antennas have been manufactured and measured.