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August 21, 1967

Delivery Pressure at The Catheter Tip

Author Affiliations

Tucson, Ariz

JAMA. 1967;201(8):640. doi:10.1001/jama.1967.03130080082030

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To the Editor:—  Since the publication of our paper entitled "Delivery Pressure at the Catheter Tip in Selective Angiography," (199:11, 1967), we have received many comments from those who are interested in this subject. Among these, the comments by Gilbert and Fletcher (200:83, 1967) are most pertinent, and we wish to offer the following answers.

  1. The frequency response of the miniature pressure transducer (Statham SF-1) was tested in our laboratory with a newly developed technique (Bottacini, Burton, and Lim: Calibration of High Frequency Manometers With the Shock Tube, J Appl Physiol, to be published)

. It showed the cutoff frequency of 3,050 cycles per second for a sinusoidal output to an input amplitude ratio of 95%. The damping ratio was 0.043. With the same technique, the cutoff frequency was 13.5 cps for the Sanborn 267B pressure transducer when it was used in conjunction with a 7F Cournand