Biomedical subjects
Publications and source records attributed to R A Welham.
Quantitative lacrimal scintillography, using 99mTc sulphur colloid, a high resolution gamma camera, and quantification using a digital computer, is a highly effective way of assessing lacrimal physiology, and of establishing normal flow and drainage values against which pathological cases may be compared.
Quantitative lacrimal scintillography is a useful clinical procedure in assessing lacrimal drainage function in patients with epiphora. Examples are presented of patients with canalicular disease, lid abnormalities, 'functional blocks', and dysthroid disease, in which this technique was valuable. Information regarding the dynamics of a functioning and non-functioning dacryocystorhinostomy is elucidated with quantitative scintillography.
A functional study of the lacrimal drainage apparatus was made in 25 patients. Angiographin was instilled into the conjunctival sac and serial radiographs were taken. The films were interpreted in conjunction with the intubation macro-dacryocystograms. Although this is a useful procedure, the use of angiographin compares unfavourably with ultra-fluid Lipiodol in a similar procedure.
The Lloyd technique of dacryocystography has been described incorporating intubation, distension, macrographic and subtraction techniques. Excellent anatomic localization is possible. With this method, logical surgery may be planned.
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Intubation MDCG with subtraction provides excellent visualization of the lacrimal excretory apparatus. Quantitative lacrimal scintillography is the most useful method of assessing lacrimal excretory function. These two investigations are complementary and may be performed simultaneously. They provide a rational basis for diagnosis and management of disease of the lacrimal drainage system.