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B R Wilcox

Publications and source records attributed to B R Wilcox.

115 records · Page 7Linked to original sources
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Software analysis of 20 MHz pulsed Doppler quadrature data.

A computer software procedure for processing quadrature data obtained from a 20 MHz pulsed Doppler system is described and the quality of results obtained is illustrated. The system is implemented on a standard laboratory minicomputer system. Software flexibility expands use of this high resolution device for measuring blood velocity to larger vessels than previously demonstrated. Techniques for dealing with high frequency aliasing, time delays, digital filtering and sampling intervals are included.

Animals↗
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The surgical anatomy of ventricular septal defect part IV: double outlet ventricle.

In this fourth part of our series of articles concerned with the surgical anatomy of ventricular septal defects (VSDs), we have analyzed the arrangements when both arterial trunks arise from the same ventricle. The essence of these anomalies is that the interventricular communication is an integral part of the circulation. Unless the surgeon constructs an alternative route of exit, closure of this defect would isolate one of the ventricles. The usual surgical approach, therefore, is to patch the hole between the ventricles into one or other of the subarterial outflow tracts. This means that all the components of the ventricular outflow tracts are of potential surgical importance. In hearts with double outlet right ventricle, the VSD can be categorized as being subaortic, subpulmonary, doubly committed, or non-committed. It is also important to determine whether its anatomical borders, as seen from the right ventricle, are in part fibrous or exclusively muscular, so as to establish the location of the atrioventricular conduction axis. It is possible, according to the nature of these borders, to place the defects into one of three groups, perimenbranous, muscular, or doubly committed and juxta-arterial. The size of the defect is another important surgical consideration. Double outlet left ventricle is a significantly more rare malformation, but the rules for determining the disposition of the conducting tissues are the same.

Double Outlet Right Ventricle↗
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Improved oxygenation during thoractomy with selective PEEP to the dependent lung.

In 22 patients during thoracotomy in the lateral position, the effects of selective positive end-expiratory pressure (PEEP) to the dependent lung while simultaneously ventilating the non-dependent lung at zero end-expiratory pressure (ZEEP) on (1) inspired O2 concentration required to maintain adequate Pao2 during thoractomy and 2) alveolar-arterial oxygen difference (AaO2D) while breathing 100 percent O2 at the end of thoractomy were examined and compared to ventilation of both lungs at ZEEP, Selective PEEP to the dependent lung resulted in adequate PaO2 with a lower inspired O2 concentration (44 +/- SD 6% versus 70 +/- SD 21%), and a smaller AsO2D while breathing 100 percent O2 189 +/- SD 31 versus 342 +/- SD 69 torr) at the end of thoracotomy.

Blood Gas Analysis↗