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Biomedical subjects

I A Macfarlane

Publications and source records attributed to I A Macfarlane.

13 recordsLinked to original sources
PubMed2004

Intravenous drug abuse and Type 1 diabetes: financial and healthcare implications.

AIMS: To determine the morbidity, mortality and healthcare costs of intravenous drug-abusing patients with Type 1 diabetes (IVDA-DM), who are admitted to hospital. METHODS: Retrospective case note analysis of admissions, complications and cost estimation over a 6-year period. Each drug-abusing patient (IVDA-DM) (n = 9) was compared with two controls (n = 18) with Type 1 diabetes but without a history of intravenous drug abuse (DM-controls). Admissions were also analysed for patients with intravenous drug abuse, but without Type 1 diabetes (IVDA-controls) (n = 198). Admissions were at a University teaching hospital in Liverpool, UK. DM-controls were drawn from a population attending diabetes outpatient clinics between 1997 and 2002 at the same hospital. The main outcome measures were: the duration and healthcare costs of hospital admissions per year, outpatient attendances per year, glycated haemoglobin (HbA(1c)), weight, micro- and macrovascular complications and mortality. RESULTS: Multiple admissions, mainly related to ketoacidosis, led to marked differences in mean (95% CI) inpatient days per year per patient [IVDA-DM 28.1 (13.6-42.7) vs. DM-control 1.1 (0.2-1.9); P < 0.0001], mean inpatient days per year per patient in critical care bed (IVDA-DM 1.7 (-0.7-4.2) vs. DM-control 0; P < 0.02) and mean costs of admission, per patient per year (pound sterling 7320 vs. pound sterling 230). The IVDA-DM group frequently omitted insulin, were underweight, failed to attend as outpatients and five had died by the end of 2002. The IVDA-controls spent considerably less time in hospital [3.4 (2.8-3.9) days per patient per year]. CONCLUSION: IVDA-DM patients have higher rates of diabetes complications, are admitted more frequently and have a high mortality compared with DM and IVDA-controls. The cost of inpatient care of this small group of patients was considerable.

Adult↗
PubMed2004

Nodules of fibrocollagenous scar tissue induced by subcutaneous insulin injections: a cause of poor diabetic control.

A 46 year old man with longstanding type 1 diabetes developed major weight loss and marked deterioration in diabetic control. He had been persistently injecting insulin into areas of abdominal lipohypertrophy within which hard collagenised fibrous tissue nodules had developed. Injecting insulin at different sites dramatically improved blood glucose control. Fibrocollagenous nodules induced by insulin injections have not been previously described. Examination of a further 73 type 1 patients revealed lipohypertrophy in 44% and hard subcutaneous nodules on two.

Abdominal Wall↗
PubMed2001

A hard thyroid mass due to plasma cell granuloma.

Plasma cell granuloma involving the thyroid is very rare. A 29-year-old man with type 1 diabetes mellitus presented with a one-week history of fever, sore throat, neck tenderness and dysphagia. Antibiotics were given but over the next two weeks a hard 8 cm mass in the left lobe of the thyroid developed. Fine needle aspiration was not diagnostic and surgical exploration revealed an inflammatory process arising from the left lobe of the thyroid involving the left sternothyroid muscle and parapharyngeal spaces. Histology of multiple biopsies showed plasma cell granuloma. Immunoperoxidase staining demonstrated the presence of IgG, IgM and IgA with predominance of IgG. The residual mass resolved and was impalpable after four weeks. Plasma cell granuloma should be suspected when there is a rapidly developing hard thyroid mass. Open biopsy/removal and histological confirmation are mandatory and residual disease may resolve within weeks.

Adult↗
PubMed2000

Recurrent encephalopathy and generalised seizures associated with relapses of thyrotoxicosis.

Seizures or encephalopathy associated with thyrotoxicosis are very rare. A 30-year-old man with thyrotoxicosis and strongly positive thyroid antibodies presented with generalised seizures preceded by an encephalopathic illness of a few days duration. CSF protein was raised and EEG showed bilateral slowing of activity. Antithyroid drug treatment rendered him biochemically euthyroid, his cognitive state returned to normal and his seizures stopped. Subsequently he had a recurrence of both encephalopathy and seizures on two occasions, coinciding with relapses of the thyrotoxicosis. This supports the view that the hyperthyroid state caused this serious neurological condition. Treatment with 131I caused hypothyroidism and he has remained seizure free and well for six years on thyroxine replacement. Corticosteroids may have been helpful in the management of his encephalopathy.

Adult↗
PubMed1994

The prediction of diabetic neuropathic plantar foot ulceration by liquid-crystal contact thermography.

OBJECTIVE: To assess whether the development of plantar foot ulceration could be predicted from the mean plantar foot temperature (MFT), as assessed by liquid-crystal contact thermography (LCT), in patients with peripheral neuropathy. RESEARCH DESIGN AND METHODS: Fifty patients with painful diabetic sensorimotor neuropathy were studied prospectively. Initially, 30 patients had no significant peripheral vascular disease (PVD) (ankle:brachial systolic blood pressure ratio > 1.0). LCT was used to assess the MFT from eight standard plantar sites. RESULTS: Initial MFT was higher in the patients without PVD (28.2 +/- 2.9 degrees C, mean +/- SD) than in patients with PVD (25.6 +/- 1.9 degrees C, P < 0.001) and in nondiabetic control subjects (25.7 +/- 2.1 degrees C, P < 0.001). At review, on average 3.6 (range 3.0-4.1) years later, 11 patients had died (6 of whom had PVD), and one was lost to follow-up. Six patients (seven feet) from the group without PVD had developed neuropathic plantar foot ulcers. The initial MFT was significantly higher in these seven feet (30.5 +/- 2.6 degrees C) than in the 38 feet of the 19 survivors in this group (27.8 +/- 2.3 degrees C, P < 0.01). Only one patient with PVD developed a plantar ulcer, although four required foot surgery for ischemic feet. CONCLUSIONS: LCT is a simple, inexpensive, and noninvasive method of identifying the neuropathic foot at increased risk of ulceration. Patients with high plantar foot temperatures are at increased risk of neuropathic foot ulceration. A normal or low MFT in the neuropathic foot is a marker of PVD, which confers an increased risk of ischemic foot disease.

Blood Pressure↗
PubMed1992

CSF enkephalins in diabetic neuropathy.

CSF methionine and leucine enkephalins were measured by high performance liquid chromatography and radioimmunoassay in diabetic patients with painful neuropathy (n = 22) and painless neuropathy (n = 5), and non-diabetic subjects with low back pain (n = 11). Wide variations in CSF enkephalin levels were found and they were often below the limit of detection (less than 0.1 pmol/l) in the diabetic and non-diabetic groups. The origin of CSF enkephalins is unknown and CSF levels may not reflect tissue concentrations. In conclusion, CSF enkephalin levels are difficult to interpret and do not provide useful information on the function of enkephalinergic pathways.

Adult↗
PubMed1983

External pituitary irradiation as a cause of TRH deficiency in patients with pituitary adenomas.

The influence of external pituitary irradiation (XRT) on thyrotroph function and PRL secretion was studied in twenty-five patients with pituitary adenomas, of whom eight had acromegaly. Twenty-one patients had undergone subtotal operative removal of their adenomas 8-190 weeks (median 12 weeks) before XRT. Following irradiation there was a significant reduction in peak serum TSH levels in response to i.v. TRH (P less than 0.05, compared with before XRT). Peak TSH levels returned to normal at 3 months. Similarly a transient reduction in TRH-stimulated beta-TSH release was observed. Serum T3 and T4 concentrations also fell after XRT, the levels at 3 months being significantly lower than control values (P less than 0.02), though no difference was seen at 6 and 12 months. A delayed (hypothalamic) serum TSH response to TRH (60 greater than 20-min level) developed at 6 months. In contrast, PRL concentrations (basal and TRH stimulated) were not altered during the 12 months following XRT. These findings demonstrate that thyrotroph function can be transiently impaired following external pituitary irradiation. None of the patients studied required T4 replacement therapy. The development of a delayed TSH response to i.v. TRH may indicate endogenous TRH deficiency. It was not associated with supra-sellar tumour enlargement in our patients and may be due to hypothalamic damage by irradiation.

Adenoma↗
PubMed1980

Glycoprotein hormone alpha subunit secretion by pituitary adenomas: influence of external irradiation.

In ninety-nine patients with pituitary adenomas, forty-six with acromegaly, the serum level of the glycoprotein hormone alpha subunit was elevated in eighteen cases. Thirteen of these were acromegalic and one had an FSH-producing tumour. Alpha levels varied little during the day, from one day to the next and over a 6 month period. In twenty-five patients with a variety of other hypothalamic-pituitary disorders examined, one patient with a craniopharyngioma had a mildly elevated alpha level. External pituitary irradiation was followed by an acute and often transient fall in alpha level in several of these patients. Of the fifty-four patients with pituitary adenomas who had received external irradiation before testing, only five had elevated alpha subunit levels compared with thirteen patients of the forty-five who had not been irradiated. This difference in incidence of elevated alpha level was statistically significant (P less than 0.025). We conclude that external irradiation may reduce alpha subunit level chronically in many patients with pituitary adenoma.

Acromegaly↗
PubMedDate not supplied

Urinary excretion of albumin, alpha-1-microglobulin, and N-acetyl-B-D-glucosaminidase in relation to smoking habits in diabetic and nondiabetic subjects.

Smoking may be a risk factor for the development of diabetic nephropathy. Therefore, the urinary excretion of albumin, alpha-1-microglobulin, and N-acetyl-BD glucosaminidase was studied in 24 young adult diabetic patients who smoked. None of these patients had urine samples positive for albumin as determined by the Albustix method (i.e., a urinary concentration of albumin of less than 0.5 g in 24 hr). Control groups were nonsmoking diabetic patients (matched for age and duration of diabetes) and nondiabetic subjects (smokers and nonsmokers). Expired breath carbon monoxide and the urinary nicotine metabolite cotinine were measured as objective markers of smoking load. No significant differences in concentrations of urinary proteins were found among any of the four groups. Therefore, smoking is not associated with the development of an increased urinary excretion of albumin within the "microalbuminuria" range. However, further studies are required to determine whether smoking is a risk factor for the progression of established microalbuminuria to Albustix positive proteinuria in diabetic patients.

Adult↗
PubMedDate not supplied

Screening for diabetic eye disease by optometrists using slit lamps.

Diabetic patients were screened for diabetic eye disease by hospital-based optometrists using a slit lamp with a 78-dioptres Volk lens. Visual acuity and intraocular pressure were also measured. Of 622 patients screened, 149 (24.0%) had background and 32 (5.1%) advanced retinopathy/maculopathy. The fundus was inadequately visualised in four (0.6%) patients. Following screening, 86 (13.8%) patients were referred to the ophthalmology clinic for appropriate treatment and follow up. Hospital-based optometrists using a slit lamp offer a useful new method for screening for diabetic eye disease. They can identify previously unrecognised sight-threatening diabetic eye disease and important non-diabetic eye disease requiring intervention, and are relatively cheap. This method is ideally suited for rapid referral to the specialist. The results merit larger-scale studies both to confirm the effectiveness of this method and to assess whether hospital trained optometrists could perform screening in the community.

Adult↗