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By David Evans

Royal London college of medication & Dentistry, U.K. First in a sequence of handbooks, created by way of 'The scientific dimension affiliates' of the British Society of Gastroenterology, devoted to elevating the factors of systems and try out analyses. DNLM: Gastrointestinal System--physiopathology.

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Am JDig Dis 1977; 22:641-645. Barlow The transducers are calibrated with atmospheric pressure as the zero level and a pressure of a minimum 50 mmHg or 50 cmH,O or 5 kPa as the high pressure level. With a water perfused system, calibration is performed by having a water column equivalent to 50 mmHg (74cmH,O) or 50 cmH,O which is applied to eachtransducer in turn to check the accuracy of the transducer output, see Fig. 9a,or by elevating the catheter, Fig. 9b. For solid state catheters the transducers are calibrated within a sealed tube and the internalpressure is increased to the desired level using an air-based system such as a sphygmomanometer, but since the silicone in these absorb water, it is advisedto soak the catheter for at least 1 hour before calibration.

9 Sundaram U, Traube M. Radiologicand manometric study of the gastroesophagealjunction in dysphagia aortica. JClin Gastroenterol 1995; 21(4):275-278. Barlovv E;. Buckton eal manomet ment calibration The recording system should be accurately set up according to the method on pp. 19 and 25 and with reference tothe manufacturer'srecommended procedure. s~t~onin~ The patient should be supine and comfortable (see p. 30). This also clears the oesophagus of gastric refluxate and oesophageal secretions [1-31.

0cm tonares in all radial ports. 5cm to nares in radial ports. Note reduced respiratory excursions within hernia. Traces continue on facing page. short and poor relaxation can beconfused with the lack of response to swallows within the hernia (Fig. 27a'b). 10 ~ ~ s ~ ~aortica. a g i Vascular a compression atthe LOS canmake relaxation measurements difficult [ S ] . LOSP and erence 1 Welsh RW, Drake ST. Normal lower esophageal sphincter; a comparison of rapid vs slow 1980; 78: 1446-145 1. pull through techniques.

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