unit, and the techniques employed were specifically designed to avoid apprehension or discomfort.The catheters used were of fine bore (maximum external diameter 0.6 and 1-8 mm.respectively) and were inserted percutaneously under local anaesthesia.The procedure is comparable to that of establishing an intravenous infusion and no skin incision is used.Flow-guided catheterization of the pulmonary artery at the bedside does not require x-ray screening nor is it associated with discomfort.Premedication is therefore not necessary since the patients are not distressed by the
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Clark et al. (1970) studied this question.
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