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To the Editor: I feel that Dr. Greenwald's strong comments published in May 1974 issue of Circulation directed to Dr. McLaurin's paper of September 1973 are unjustified. Dr. Greenwald has done a disservice to the many excellent papers based on polaroid echocardiograms. While there is no doubt that strip chart records are preferable to polaroid echocardiograms, because of the ease with which echocardiography may be performed using strip chart, it should be pointed out that expensive equipment is no substitute for careful technique. The idea is to sector scan the heart, and it is entirely possible to do this with polaroid on a slow sweep. A strip chart recorder is as expensive as an echocardiograph itself. Not all hospitals are as lucky as Dr. Greenwald's to afford $20,000 for echocardiography equipment with a strip chart. This is particularly true wvhen a new service is being established in a community. I would reaffirm that gadgetry is no substitute for quality and experience. A. S. ABnBASI, M. D. Director, Non Invasive Laboratory The Center for the Health Sciences University of California Los Angeles, California

Subpulmonary Ventricular Septal Defect with Pulmonary Stenosis