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The dynamic performance of arterial manometers depends upon the values of the natural frequency fo and the damping factor beta. Satisfactory reproduction of all arterial waveforms requires that fo should be greater than about 13 Hz; for an fo of 13 Hz, beta should have a value of 0.5, but, as fo increases, an increasing range of beta values is permissible. We measured fo and beta for two pressure transducers (Gould P23 Statham and Gould Disposable) in combination with Portex or Gould catheter tubing of lengths varying from 100 cm to 300 cm. All combinations were considerably underdamped, with the best having an fo of 30 Hz and a beta of 0.1. We also investigated the performance of a commercial device, the Accudynamic, designed to allow beta to be increased without affecting fo. We found that the Accudynamic worked well, allowing acceptable performance to be obtained from the Gould Disposable transducer with catheters up to 200 cm in length.
M W Allan, and
W M Gray, and
A J Asbury
May 1976,
Biomedical engineering,
M W Allan, and
W M Gray, and
A J Asbury
September 1991,
British journal of anaesthesia,
M W Allan, and
W M Gray, and
A J Asbury
April 1963,
IEEE transactions on bio-medical engineering,
M W Allan, and
W M Gray, and
A J Asbury
September 1979,
Minerva pediatrica,
M W Allan, and
W M Gray, and
A J Asbury
April 1992,
Kyobu geka. The Japanese journal of thoracic surgery,
M W Allan, and
W M Gray, and
A J Asbury
January 1968,
Biomedical sciences instrumentation,
M W Allan, and
W M Gray, and
A J Asbury
February 1986,
Neurologia medico-chirurgica,
M W Allan, and
W M Gray, and
A J Asbury
May 1974,
Medical & biological engineering,
M W Allan, and
W M Gray, and
A J Asbury
February 1972,
Iyo denshi to seitai kogaku. Japanese journal of medical electronics and biological engineering,
M W Allan, and
W M Gray, and
A J Asbury
July 1993,
International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics,
