| 1. |
- Ask, Per, et al.
(författare)
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A simple device measuring differences in level in the oesophagus
- 1978
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Ingår i: Acta Oto-Laryngologica. - : Informa UK Limited. - 0001-6489 .- 1651-2251. ; 85:3-4, s. 296-297
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- A device for measuring the difference in level between the pressure transducer and a point of measurment is described. It can be used in oesophageal manometry with waterfilled catheters to measure and compensate for superimposed hydrostatic pressure. The practical application of the method is illustrated.
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| 2. |
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| 3. |
- Ask, Per, 1950-, et al.
(författare)
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Clinical evaluation of different fluid-filled systems for oesophageal manometry
- 1979
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Ingår i: Scandinavian Journal of Gastroenterology. - 0036-5521 .- 1502-7708. ; 14:1, s. 1-5
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Tidskriftsartikel (refereegranskat)abstract
- In a clinical study of oesophageal manometry with fluid-filled catheters, both a non-perfused system and a perfused system with a syringe pump have been compared to a system with a low-compliance perfusion pump, which served as a reference. Significantly lower values of motility amplitudes, motility derivatives, and partly of LES pressures, and a time delay of up to 0.5 sec of the amplitude maximum were obtained with the non-perfused system and the system with a syringe pump in comparison to the low-compliance system. Since the oesophageal function can be erroneously evaluated by use of a non-perfused system or a perfused system with a syringe pump, such systems cannot be recommended for clinical use.
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| 4. |
- Ask, Per, et al.
(författare)
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Combined pH and pressure measurement device for oesophageal investigations.
- 1981
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Ingår i: Medical and Biological Engineering and Computing. - 0140-0118 .- 1741-0444. ; 19:4, s. 443-446
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Tidskriftsartikel (refereegranskat)abstract
- A combined pH- and pressure-measurement device for oesophageal investigations has been designed using monocrystalline antimony pH electrodes and perfused polyvinyl catheters. The combined device facilitates pressure measurements simultaneously with pH recording, both distal and proximal to the pH electrode. The device is easier to pass through the nose to the oesophagus than the conventional glass pH electrode. pH and pressure measurements in the oesophagus are therefore simplified and valuable information about the function of the region of the lower oesophageal sphincter is added owing to the simultaneous recording of the two parameters.
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| 5. |
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| 6. |
- Ask, Per, et al.
(författare)
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Effect of time interval between swallows on esophageal peristalsis.
- 1980
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Ingår i: American Journal of Physiology. - 0002-9513 .- 2163-5773. ; 238:6, s. G485-90
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Tidskriftsartikel (refereegranskat)abstract
- Esophageal peristaltic pressure amplitude, peristaltic incidence, speed of peristalsis, and wave duration were investigated as a function of swallow interval. In the distal half of the esophagus, the amplitude decreased at swallow intervals of 8 s and shorter. At intervals of 8 and 4 s, dropouts of contractions that were obtained were most frequent in the distal esophagus and for the 4-s interval. At continuous swallows no contractions were obtained below the upper esophageal sphincter until the end of the swallow sequence, after which a peristaltic wave of high amplitude propagated along the esophagus. The peristaltic speed increased toward a level 5 cm above the lower esophageal sphincter. The peristaltic wave duration was approximately the same in different parts of the esophagus and at different swallow intervals. The findings indicate an impairment of esophageal transport function by short swallow intervals.
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| 7. |
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| 8. |
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| 9. |
- Ask, Per, et al.
(författare)
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Evaluation of a new method for abdominal compression for use in oesophageal investigation.
- 1982
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Ingår i: Scandinavian Journal of Gastroenterology. - 0036-5521 .- 1502-7708. ; 17:2, s. 269-272
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Tidskriftsartikel (refereegranskat)abstract
- The use of conventional extra-abdominal compression with a constant cuff pressure was shown to give various pressures intra-abdominally in different subjects. A feedback system was therefore used, in which the extra-abdominal pressure is controlled by the intra-abdominal pressure. For an intra-abdominal pressure increase of 15 mm Hg the external cuff pressure in 20 subjects varied from 21 to 98 mm Hg. There was, however, an almost linear relationship between increased intra-abdominal pressure and cuff pressure. The extra-abdominal pressure required to obtain a certain intra-abdominal pressure also varied with the size of the cuff. To obtain relevant and comparable results in studies of hiatal incompetence and gastro-oesophageal reflux, the feedback system is recommended and the size of the intra-abdominal cuff should be stated.
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| 10. |
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