Impedance Planimetry: A New Approach to Biomechanical Intestinal Wall Properties

Gregersen, Hans; Djurhuus, Jens Christian

doi:10.1159/000171320

Cited by 71 publications

(66 citation statements)

References 15 publications

(34 reference statements)

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“…Intubation was performed with a combined manometry and impedance catheter (Cook, Bjaeverskov, Denmark) that was previously described in detail (4). Three manometry ports positioned at 6, 12, and 18 cm from the catheter tip were used to record pressure above, within, and below a 3-cm-long polyethylene distension bag, within which were housed a manometric channel, the distending channel, and two pairs of ring electrodes for impedance measurement.…”

Section: Methodsmentioning

confidence: 99%

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Identification of the biomechanical factors associated with the perception of distension in the human esophagus

Barlow

Gregersen

Thompson

2002

American Journal of Physiology-Gastrointestinal and Liver Physi

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Current techniques used to investigate the mechanisms responsible for the sensory responses to distension of the human esophagus provide limited information because the degree of circumferential stretch required to determine tension can only be inferred. We used impedance planimetry to measure the cross-sectional area during esophageal distension to ascertain the degree of stretch and tension that initiated motor and sensory responses. Hyoscine- N-butyl bromide (HBB), a cholinergic muscarinic receptor blocker, was also used to alter esophageal tension during distension. Motor activity was initiated at a lower degree of stretch and tension than that which initiated sensory awareness; both increased directly with increasing distension. HBB reduced both esophageal motility and tension during distension without altering the relationship between sensation intensity and cross-sectional area. Esophageal stretch, rather than tension, thus appears to be the major factor influencing sensory responses to esophageal distension.

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Section: Methodsmentioning

confidence: 99%

“…In has now become possible to make a more accurate assessment of the degree of stretch of a hollow viscus in vivo using impedance planimetry (4,9,14). This technique, combined with manometry, provides both an estimate of CSA and transmural pressure at the site of distension.…”

mentioning

confidence: 99%

Identification of the biomechanical factors associated with the perception of distension in the human esophagus

Barlow

Gregersen

Thompson

2002

American Journal of Physiology-Gastrointestinal and Liver Physi

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“…ampullometry. The principle of measurement and possible sources of er ror have previously been described in detail [12][13][14][15][16][17][18][19][20], These aspects were taken into ac count in this study. The technique allowed us to derive biomechanical parameters from measurements of pressure and Bcsa.…”

Section: Methodological Aspectsmentioning

confidence: 99%

Biomechanical Wall Properties of the Porcine Rectum: A Study Using Impedance Planimetry

Dall¹,

Jørgensen²,

Djurhuus³

et al. 1991

Dig Dis

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The aim was to investigate biomechanical wall properties of the porcine rectum by way of manometry and impedance planimetry. Distension of a balloon inserted into the rectum with definite pressure steps up to 80 cm H₂0 was done for simultaneous recording of pressure and the balloon cross-sectional area (Bcsa). Viscoelastic wall properties were derived in terms of compliance. Besides eliciting the ascending peristaltic reflex and relaxation of the internal anal sphincter, the balloon inflation elicited a phase of rapid Bcsa increase followed by an accommodation phase of slow Bcsa increase to a steady-state Bcsa, reached within 3 min. The Bcsa increased in a nonlinear way with increasing balloon pressures with only a minimal increase from 70 to 80 cm H₂O. Rectal compliance decreased in a nonlinear way with increasing distension pressure.

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“…CSA was measured on-line from the measurement of the elec trical impedance of the fluid inside the balloon [ 13,14,21,22]. When a current 1 is induced in a uniform cylinder by two outer electrodes, the potential difference V between two inner detection electrodes is governed by Ohms law V = I-R.…”

Section: Measurement O F Csamentioning

confidence: 99%

“…Calibration of the CSA mea suring system was done in tubes with known luminal CSAs. Compu tation of the dynamic parameters of the measuring system was done as described previously and found to be in the same range [11,14,17,21,22]. Linearity between the output voltage and CSA was demon strated up to a CSA o f 200 mm2 (diameter = 15.9 mm).…”

Section: Measurement O F Csamentioning

confidence: 99%

Pressure-Cross-Sectional Area Relations and Elasticity in the Rabbit Oesophagus in vivo

Gregersen¹,

Christensen²

1996

Digestion

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The aim was to assess the luminal cross-sectional area (CSA) and the passive elastic properties of the oesophageal body under luminal pressure loading in anaesthetized rabbits. Stepwise inflation of a luminal balloon, in which the CSA and pressure were measured by means of impedance planimetry and perfused low-compliance manometry, provided the distension stimulus. The parameters of elasticity were computed from steady state values of these measurements. The steady state pressure-CSA and pressure-radius relations were nonlinear. At the lowest and highest luminal pressure load of 1 and 10 kPa, the steady state CSAs were 39 ± 3 and 91 ± 4 mm², respectively. The circumferential tension-strain distribution was nonlinear and showed an exponential behaviour that fitted well to the function tension = a·e^b·stram. Differentiation of the function yielded the wall stiffness which also showed an exponential behaviour.

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Impedance Planimetry: A New Approach to Biomechanical Intestinal Wall Properties

Cited by 71 publications

References 15 publications

Identification of the biomechanical factors associated with the perception of distension in the human esophagus

Identification of the biomechanical factors associated with the perception of distension in the human esophagus

Biomechanical Wall Properties of the Porcine Rectum: A Study Using Impedance Planimetry

Pressure-Cross-Sectional Area Relations and Elasticity in the Rabbit Oesophagus in vivo

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