The purpose of this study was to develop, implement, and evaluate an audiotape and accompanying handouts on hemodynamics as a supplemental teaching aid in the Health Science Learning Center of New York City Technical College. It was hypothesized that there would be a significant difference between the mean examination grade on hemodynamics of students exposed to the teaching aid and those not exposed to the teaching aid. The control group consisted of 20 students from one section of the course who were exposed to classroom instruction only, and the experimental group was made up of 20 students from another section who were exposed to classroom instruction and the teaching aid. Findings confirmed the hypothesis and indicated the effectiveness of the teaching aid. As a result of the study it was recommended that the teaching aid be implemented permanently and that more studies be conducted to ascertain further validity of the instrument. Development of similar teaching aids on other topics of interest and seeking funding for development of additional teaching aids were also recommended. The script of the audiotape, the accompanying handouts, and statistical data from the evaluation are appended. (30 references) (Author/MES)