Technetium-99m-L,L-ethylenedicysteine renal scan as a single-modality investigation for the evaluation of renal morphology and function: a comparative study with technetium-99m-dimercaptosuccinic acid.

Abstract

AIM:

To evaluate whether cortical scars can be detected using the summed images of technetium-99m-L,L-ethylenedicysteine (99mTc-L,L-EC) renal dynamic scan, and to compare the results with technetium-99m-dimercaptosuccinic acid (99mTc-DMSA) scan. To evaluate the inter-observer variability for 99mTc-L,L-EC and 99mTc-DMSA scan reporting.

METHODS:

One hundred and three patients were initially included in the study; 21 were excluded, five due to a single functioning kidney and 16 due to impaired renal function (serum creatinine>2.5 mg.dl(-1)). Eighty-two patients (39 females, 43 males), including 31 children, with a mean age of 33.4+/-11.3 years (range, 4 months to 74 years), underwent both 99mTc-DMSA and 99mTc-L,L-EC scintigraphy within a period of 14 days. 99mTc-L,L-EC images were regrouped into 2 min image sets, and the initial 2 min summed image (cortical phase) was used for the evaluation of scars. Three independent observers analysed both images separately on different days without being aware of the identity and clinical details of the patients. Their 99mTc-L,L-EC findings were compared with the consensus 99mTc-DMSA scan findings taken as reference.

RESULTS:

The overall sensitivity of 99mTc-L,L-EC scans was 93% and the specificity was 96%. The inter-observer variability was 0.91 for 99mTc-L,L-EC and 0.94 for 99mTc-DMSA scan reporting, using the weighted kappa analysis at P<0.05.

CONCLUSIONS:

99mTc-L,L-EC is an excellent single-modality comprehensive investigational agent for renal morphology, function and outflow tract evaluation with the added advantages of lower cost, convenience and low radiation exposure to the patient.

• Authors: Chandrashekar Narayana, Madhavi Tripathi, Ajay Kumar, Naveen Krishne Gowda, Hentok Phom, Prem Chandra, Gurupad Bandopadhyaya, Chandrasekhar Bal
• Journal: Nuclear medicine communications (Nucl Med Commun) Vol. 25 Issue 7 Pg. 743-7 (Jul 2004) ISSN: 0143-3636 [Print] England
• PMID: 15208504 (Publication Type: Clinical Trial, Comparative Study, Controlled Clinical Trial, Journal Article, Validation Study)

Chemical References

• Organotechnetium Compounds
• Radiopharmaceuticals
• technetium Tc 99m-ethylenedicysteine
• Technetium Tc 99m Dimercaptosuccinic Acid
• Cysteine

Topics

• Adolescent
• Adult
• Aged
• Aged, 80 and over
• Child
• Child, Preschool
• Cicatrix (diagnostic imaging)
• Cysteine (analogs & derivatives)
• Female
• Humans
• Infant
• Kidney Diseases (diagnostic imaging)
• Kidney Function Tests (methods)
• Male
• Middle Aged
• Organotechnetium Compounds
• Radioisotope Renography (methods)
• Radiopharmaceuticals
• Reproducibility of Results
• Sensitivity and Specificity
• Single-Blind Method
• Technetium Tc 99m Dimercaptosuccinic Acid