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W J Dodds

Publications and source records attributed to W J Dodds.

388 records · Page 22Linked to original sources
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Requirements for accurate manometric recording of pharyngeal and esophageal peristaltic pressure waves.

The frequency characteristics and wave form of peristaltic pressure complexes occurring in the pharynx and esophagus of normal subjects were studied. For each of five subjects, five peristaltic waves were selected for analysis from the proximal and distal pharynx as well as the proximal, middle, and distal esophagus. Thus, 25 peristaltic waves were analyzed from each of the five regions studied, giving a total of 125 in all. After digitization of the peristaltic waves, pressure values were entered into a computer algorithm that performed a Fourier transformation to determine frequency content and wave slope. The computer analysis revealed that a frequency response flat to 5 Hz was adequate to record 98% of esophageal peristaltic waves with 98% accuracy. In contrast, recording accuracy up to 48 Hz was needed for high-fidelity recording in the pharynx. Rates of pressure change were substantially greater for pharyngeal peristaltic pressure complexes compared with esophageal peristaltic complexes. The results suggest that appropriately designed infused-catheter systems can readily meet the requirements for accurate recording of peristaltic pressure waves in the esophagus but not in the pharynx. Consequently, different instrumentation, such as an intraluminal strain gauge probe, is needed for accurate manometric recording of pharyngeal peristalsis.

Adult↗
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Periportal tracking in hepatic trauma: CT features.

In retrospective review, 51 cases of hepatic trauma were analyzed for type and location of injury. More than half of these cases (62%) demonstrated periportal zones of decreased attenuation, which is presumed to represent blood in the periportal region. This finding has been termed "periportal tracking" and may be an important sign of subtle liver injury.

Abdominal Injuries↗
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Traumatic fracture of the pancreas: CT characteristics.

Pancreatic fracture is a rare injury caused by blunt abdominal trauma. Few proven cases have been diagnosed by abdominal CT. The typical clinical triad of upper abdominal pain, leukocytosis, and hyperamylasemia is nonspecific. Abdominal CT gives the best opportunity for an immediate diagnosis. Nevertheless, few cases of traumatic pancreatic fracture have been diagnosed by abdominal CT within 24 h following injury and proven at laparotomy. In this report we describe five cases of traumatic pancreatic fracture identified on CT; four cases were verified at laparotomy. Traumatic pancreatic fracture generally occurs as a transverse transection across the neck of the pancreas. Commonly, an accompanying injury to other visceral organs is present. The diagnosis of pancreatic fracture requires a high index of suspicion with close scrutiny of the CT images.

Abdominal Injuries↗
PubMedDate not supplied

[Influence of the viscosity of the swallowed food bolus on the motility of the pharynx].

In 9 young men, healthy volunteers, we studied the effect of dry swallows, liquid and paste swallows on the pharyngeal motility. The viscosities of liquids and past were 200 centipoise (cP), 300 cP and 60000 cP, respectively. The bolus volume was 10 ml. For pharyngeal manometry we used two strain-gauge manometric probes taped together, so that a total of six transducers were staggered at 1.5 cm intervals. After its passage through the nose, the assembly was positioned so that all its transducers faced posteriorly, and manometric activity was recorded from oropharynx, hypopharynx and upper esophageal sphincter (UES). We also recorded infra-hyoid electromiographic activity. The amplitude and duration of the oropharyngeal and hypopharyngeal peristaltic pressure complex were not changed by the different boluses. The velocity of peristaltism propagation between oropharynx and UES was slower for paste than for liquids or dry swallows. The increased of viscosity was associated with longer duration of UES relaxation, and greater intrabolus pressure in hypopharynx and UES. The infra-hyoid electromiographic activity was longer for paste than for liquids or dry swallows. These findings suggest that pharyngeal motility is affected by the characteristics of the swallowed bolus.

Adolescent↗
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Amyloidosis.

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Amyloidosis↗