Key result
Selective angiocardiography machine pressure produces peak catheter tip pressures exceeding ~500 mm Hg.
High delivery pressures (peak and plateau) are generated at the catheter tip during angiocardiography, which dissipate exponentially with distance from the openings.
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High tip pressures may risk local vascular injury during injections; leaves open safer delivery protocols pending clinical outcome data.
The delivery pressure at the catheter tip during angiography was studied by means of a miniature pressure transducer at the tip and side openings of cardiac catheters over a wide range of machine pressures (100 to 800 pounds per square inch [psi]). It is composed of a peak pressure and a plateau pressure. The peak pressure has a short duration (usually less than 0.2 seconds) but often exceeds 500 mm Hg even under a low machine pressure of 100 psi. The plateau pressure has a longer duration, lasting for two seconds or more when 60 ml of contrast substance are used. Under a high machine pressure of 500 psi or more, the plateau pressure reaches a level of 500 mm Hg. Both peak and plateau pressures fall exponentially with increased distance from catheter openings, and the flow of the surrounding fluids has no appreciable effect in the dissipation of the high velocity jet.
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Thomas P. K. Lim (1967) studied Selective Angiocardiography. Machine pressure during selective angiocardiography was evaluated on Delivery pressure at the catheter tip. Machine pressure during selective angiocardiography produces a peak catheter tip pressure often exceeding 500 mm Hg at 100 psi, and a plateau pressure reaching 500 mm Hg at 500 psi.
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