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Biomedical subjects

G Duffy

Publications and source records attributed to G Duffy.

13 recordsLinked to original sources
PubMed1992

Biliary complications of cystic fibrosis.

One hundred and four adult patients with cystic fibrosis were evaluated for the presence of liver disease as defined by abnormal liver function tests of six months' duration, histological evidence of fibrosis or cirrhosis, or the presence of portal hypertension, or both. Twenty patients fulfilled these criteria and were evaluated further for the presence of biliary tract abnormalities with biliary scintigraphy using 99Tc diisopropylphenyl-carboxymethyl iminodiacetic acid (DISIDA) and endoscopic retrograde cholangiography. Clearance of 99Tc DISIDA from the liver and biliary tree was diminished at 45 (E45) and 60 (E60) minutes in the patients with liver disease compared with those without liver disease; E45 = 37.8% and 65.8%, p less than 0.01; E60 = 48.2% and 77.5%, p less than 0.01 respectively. Serial analogue images of the extrahepatic biliary tree were consistent with common bile duct obstruction with retention of DISIDA and tapering of the common bile duct in seven of 18 patients with and two of 10 patients without liver disease. Endoscopic retrograde cholangiography showed changes consistent with sclerosing cholangitis, with beading and stricturing of the intrahepatic ducts in 12 of the 14 patients. In all 14 patients, including those in whom biliary scintigraphy had suggested obstruction, no abnormality of the common bile duct was identified. These results indicate that abnormalities of the bile ducts in patients with cystic fibrosis related liver disease are confined to the intrahepatic biliary tree and that common bile duct strictures do not contribute to either the progression or development of liver disease in these patients.

Adolescent↗
PubMed1988

Detection of splenosis: 99Tcm tin colloid scanning and computed transmission tomography compared.

Ten patients who had been splenectomized for trauma between 1 and 11 years previously were studied by computed tomography (CT) and radionuclide scanning with 99Tcm tin colloid on the same day. Computed tomography detected splenic tissue in three patients. Radionuclide scanning detected splenic tissue in eight patients, including two cases of typical splenosis not identified by CT. Radionuclide scanning was found to be more sensitive in the detection of residual splenic tissue than CT.

Adult↗
PubMed1986

Reversible myocardial perfusion defects during cold challenge in scleroderma.

Myocardial perfusion was studied using 201thallium scintigraphy in patients with Raynaud's phenomenon undergoing cold challenge. Ten patients with systemic sclerosis and 10 with other systemic rheumatic diseases were selected. Patients with clinical features of cardiac disease were not included. Both groups of patients had similar cold-induced elevations of pulse rate and systolic and diastolic blood pressure. Reversible perfusion abnormalities suggesting cold-induced ischaemia were seen in four of the ten patients with systemic sclerosis, but in none of the patients with other rheumatic diseases. This study supports the suggestion that the vascular disorder in scleroderma differs from that seen in other rheumatic diseases which are associated with Raynaud's phenomenon.

Adolescent↗
PubMed1986

A comparison between four simple methods for measuring glomerular filtration rate using technetium-99m DTPA.

Numerous centers perform glomerular filtration rate (GFR) measurements on patients undergoing renal imaging with Tc-99m DTPA. GFR measurement, however, does involve multiple blood samples taken over a 4-hour period, and this has led to attempts to simplify the technique by reducing the number of blood samples required and hence diminish the time taken to perform the test and the inconvenience to the patient. Four different simplified techniques for measuring GFR that have been reported in the literature are compared with a reference 2 blood sample method. Three of the methods do not require any blood samples but have standard errors of greater than 20 ml/min in adults and greater than 14 ml/min in children. The other method requires one blood sample, and if this is taken at 2 hours postinjection, the standard error is 9 ml/min in adults and 5 ml/min in children. The latter method is suitable for routine use in renography when accuracy is not of paramount importance.

Adult↗
PubMed1986

GFR measurement by simulating constant infusion with data acquired using a CdTe detector. A feasibility study.

Conventional nuclear medicine methods for measuring glomerular filtration rate, GFR, are invalidated if the initial injection of radiopharmaceutical is tissued. An analytical method proposed by Veall and Gibbs in 1982 overcomes this difficulty but does require multiple blood samples. This paper investigates whether it is feasible to use the analytical method on data acquired with a CdTe detector system and thereby reducing to one the number of blood samples required. Synthetic data were used to investigate the effect of (a) duration of sampling (b) statistical noise and (c) non-stationarity on the GFR values derived by the Veall and Gibbs method. A sampling duration of 100 min is shown to be adequate and statistical noise is not a limiting factor. However, data fluctuations, mainly due to detector motion, do reduce the accuracy of the method. When the analytical technique is applied to data obtained using a CdTe detector on 40 patients the GFR values are similar to those derived by the conventional method (r = 0.957, Syx = 9.1 ml min-1). The technique is sufficiently attractive to warrant further studies to establish its absolute accuracy.

Computer Simulation↗