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Temporary anchorage of intravenous giving‐sets during cardiopulmonary resuscitation

Dr G. S . Riddell's comments (Anaesthesia 1983; 38: 699) on my technique for using the 23 G Wallace Y Can unit for arterial cannulation (Anaesthesia 1983; 38: 297) are interesting. He is, I think, looking for problems where none exist. The very sharpness of the needle and the angle of the bevel ensures that if it enters the wall of the cannula it penetrates in a most obvious manner. To test the possibility of fragments being shaved from the inside of the cannula four cannulae were subjected to repeated (50 times) re-insertion of the needle and then the cannulae, the inside and the tip of the needle, were examined with an operating microscope. There were neither loose particles nor scoring of any cannula. The technique described is basically safe if used with care and commonsense. It is very difficult to ensure the absence of small air bubbles in the device if the chamber is not prefilled with saline in the way described.