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J S Pfeifer

Publications and source records attributed to J S Pfeifer.

11 recordsLinked to original sources
PubMed1979

Evaluation of right atrial-pulmonary artery conduits for tricuspid atresia. Experimental study.

Blood flow through right atrial-pulmonary artery (RA-PA) conduits was investigated. Experiments were designed to evaluate the pumping function of the right atrium, effects of the atrial versus ventricular pacing site, the necessity of a valve within the conduit, and the effect of positive-pressure ventilation on conduit flow. Twenty foxhounds were subjected to silicone patch closure of 90 percent of the tricuspid valve orifices to create stenosis. Ten dogs successfully underwent RA-PA shunting with a conduit with paralled limbs, one containing a prosthetic valve. The proximal main pulmonary artery was ligated to ensure total diversion of blood via the conduit. Valved and nonvalved conduit flow was significantly correlated with right atrial pressure (RAP): r = 0.95, p less than 0.05; r = 0.98, p less than 0.01, respectively. There was no significant effect of increasing heart rate (p = 0.19), atrial versus ventricular rhythm (p = 0.28), or the presence of a valve (p = 0.63). Increasing tidal volume resulted in increasing tidal conduit flow (expiration-inspiration) (r = 1.0, p less than 0.01), but mean flow was unaffected. Therefore, RAP is the most important factor influencing conduit flow. The absence of a valve, ventricular rhythm, and tachycardia did not significantly alter flow in this acute experimental model.

Animals↗
PubMedDate not supplied

The oral prophylaxis--survey II.

A survey of Wisconsin dentists was done to better understand what procedures dentists are including in their oral prophylaxis or soft-tissue management program. The goal of the survey was to develop data so that suggestions could be made to improve this service. When we compare this survey with the survey done four years ago, we see a decline in quality care, particularly in the time spent doing the oral prophylaxis. There was little or no improvement in recording of periodontal probing depths, sharpening of instruments, use of disclosing solution and the frequency of recall.

Dental Prophylaxis↗