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Biomedical subjects

F J Ives

Publications and source records attributed to F J Ives.

10 recordsLinked to original sources
PubMed2006

Vascular depression in older people with diabetes.

AIMS/HYPOTHESIS: Cerebrovascular disease may be causal or a vulnerability factor in late-onset depression and may explain the high rate of depression in older adults with diabetes. We explored a wide range of potential explanatory variables of depression in a longitudinal study of older diabetic subjects to investigate the vascular depression hypothesis in these patients. METHODS: We recruited 207 subjects with diabetes selected for potential cognitive deficits from an existing observational cohort study (average age 75.7 +/- 4.6 years, 52.2% men) for an assessment of depression using a standardised diagnostic instrument (Cambridge Examination for Mental Disorders of the Elderly -- Revised). All subjects underwent a detailed clinical assessment at baseline and at follow-up (after 7.5 +/- 1.1 years). RESULTS: Major depression was present in 45 subjects (21.7%) and minor depression in ten (4.8%). A positive history of strokes and the presence of peripheral arterial disease were significantly associated with depression at the time of diagnosis. In a subsample of 93 cases who underwent structural neuroimaging, the presence of cerebral infarcts was also significantly associated with depression. Treatment with glucose-lowering therapy, higher serum cholesterol levels and difficulties with activities of daily living at baseline were significant predictors of depression at follow-up. CONCLUSIONS/INTERPRETATION: A history of cerebrovascular disease was strongly associated with depression and cerebrovascular risk factors were significant predictors of depression in older diabetic patients. Our findings are consistent with the hypothesis that the excess risk of depression in older diabetic patients is related to underlying cerebrovascular disease.

Aged↗
PubMed1996

Intracranial plasma cell granuloma.

We present a case of plasma cell granuloma involving the dura mater with infiltration of the adjacent brain parenchyma. The radiological and pathological features of this entity are described.

Brain Diseases↗
PubMed1996

Analysis of sinusoidal-shaped frequency-selective RF pulses.

RODEO (rotating delivery of excitation off resonance), which can be represented as an delta [symbol: see text] pulse where delta is an 2 pi-sinusoidal waveform and [symbol: see text] = - delta, has been used as a frequency-selective rf pulse for fat-suppressed three-dimensional magnetic resonance imaging. This study systematically compared several sinusoidal-shaped pulses with different combinations of delta and [symbol: see text]. The sinusoidal-shaped pulses were also compared with the Gaussian-shaped and binomial-shaped pulses. The overall performances for fat suppression can be rated as "delta [symbol: see text] delta > 1331 > delta [symbol: see text] = 121," where 121 and 1331 are second- and third-order binomial pulses, respectively.

Adipose Tissue↗
PubMed1996

The Perth endoluminal bifurcated graft system--development and early experience.

The study aim was to develop a reliable endoluminal graft system that would enable the deployment of a bifurcated graft for infrarenal abdominal aortic aneurysms. A life-size plastic model was made of an abdominal aorta and iliac arteries, with a 50-mm infrarenal abdominal aortic aneurysm. This model was used to develop and test self-expanding graft systems, based on a barbed Gianturco stent and series of stainless-steel 'Z' stents within a woven Dacron graft. The bifurcated system developed involves a trouser graft with one long leg and one short. This graft-system is delivered through one femoral artery with deployment of the proximal aortic end infrarenally and the longer trouser leg within the ipsilateral common iliac artery. The short trouser leg is left hanging free within the distal end of the aneurysm cavity, just above the bifurcation. It is held open by a self-expanding stent and is cannulated from the contralateral femoral artery with a guide wire. A simple straight self-expanding stented graft is then deployed to extend this short trouser leg down into the common iliac artery, effectively creating an extension to the short leg. The graft system has been deployed in 21 patients with satisfactory exclusion of the aneurysm in 17 (81%). There has been one mortality and no conversion to open repair. All 17 aneurysms remain excluded at median follow-up of 30 (range 4-60) weeks. None of the four graft stents that leaked (two proximal and two distal) sealed spontaneously. Deployment of the uncovered Gianturco stent across the renal artery origins in 18 cases (85%) has not been associated with renal artery occlusion or deterioration in renal function at a median follow-up of 30 (range 4-60) weeks. The ability to deploy a bifurcated system increases the potential for endoluminal treatment of abdominal aortic aneurysm.

Aged↗
PubMed1996

Breast MRI: early experience with a 3-D fat-suppressed gradient echo sequence in the evaluation of breast lesions.

The early clinical experience with a 3-Dimensional Fourier Transform Gradient Echo sequence with fat suppression in the evaluation of breast masses is reported. Ten female patients with breast malignancies were pre-operatively evaluated with this sequence and the results compared with the pathological specimens. The scanning protocol included a non-contrast sequence followed by an immediate post-contrast sequence (completed 4.5 min after intravenous contrast injection) and a delayed sequence. Images were assessed for maximum lesion and parenchymal enhancement, lesion size and additional enhancing abnormalities. In six patients, malignant masses enhanced maximally on the immediate post-contrast sequence with parenchyma enhancing maximally on delayed images. In three cases, there was preferential enhancement of malignant lesions over normal parenchyma but to a similar degree on both post-contrast sequences. In one case, both the lesion and parenchyma enhanced maximally on the delayed sequence. Magnetic resonance assessed lesion size accurately and also detected satellite malignancies in one case. However, lesion grade, associated in situ carcinoma and lymphovascular invasion did not impact on lesion enhancement. In this small series, a contrast-enhanced, fat-suppressed 3-D Gradient Echo Sequence detected breast carcinoma with high sensitivity. The technique holds promise but further evaluation is required.

Breast↗
PubMed1995

Cost versus efficacy of magnetic resonance imaging.

Magnetic resonance imaging offers new and improved diagnostic capabilities in all body parts and organ systems. Examinations can be quicker, safer and less expensive than traditional radiological procedures. The cost/efficiency of magnetic resonance imaging is under active evaluation.

Central Nervous System Diseases↗
PubMed1993

Cerebral and brain stem Langerhans cell histiocytosis.

Two patients with central nervous system manifestations of Langerhans cell histiocytosis, both with brain stem involvement, are reported. The onset of symptoms was at an age when the diagnosis might not have been considered.

Adult↗
PubMed1993

Cranial dural arteriovenous malformation and fistula. Radiological diagnosis and management. Review of thirty four patients.

The clinical features, imaging and angiographic findings of thirty four patients with cranial dural arteriovenous malformations and fistulae are presented in four groups. Group 1--Seven patients with anterior cavernous malformations, predominant superior ophthalmic vein drainage, and symptoms and signs of carotico-cavernous fistula. Group 2--Twelve patients with malformations of the superior petrosal, transverse and sigmoid sinus regions, presenting predominantly with bruit. Group 3--Seven patients with malformations of the basal sinuses and prominent cortical venous drainage, presenting with intracranial haemorrhage, headache and impaired cortical function. Intracranial haemorrhage never occurred in the absence of cortical venous drainage. Group 4--Eight patients with infrequent manifestations. Group 1 and 2 patients are readily recognized and diagnosed. Group 3 and 4 patients are often misdiagnosed. Treatment modalities comprised embolisation therapy, surgical excision, and carotid compression. Twenty patients were treated by one or more of these modalities with a successful outcome in thirteen patients. Group 1 patients are the most amenable to trans-arterial embolisation. Carotid compression as the sole modality of treatment was successful in four patients. Unless the fistula is successfully closed, Group 3 patients and patients who present with cervical or thoracic myelopathy carry a grave prognosis. There is need for greater radiologist awareness of Group 3 and the rarer presentations, particularly myelopathy. With the exception of one patient, the morphological features of our cases are consistent with the now-accepted view that these lesions are acquired arterio-venous fistulae and not congenital malformations.

Adolescent↗
PubMed1988

Steroid-induced CT changes in patients with recurrent malignant glioma.

The magnitude and time course of steroid-induced CT changes were analyzed in 11 patients with recurrent malignant glioma. CTs were obtained before and at regular intervals after starting dexamethasone (16 mg/d). Midline shift, ventricular compression, edema, enhancement intensity, and the size of the enhancing mass often improved with steroid treatment. Improvement occurred within 2 weeks in most instances. Changes in the volume of the enhancing tumor were assessed quantitatively in eight patients. In six, the mass was smaller after 2 weeks of steroid therapy, and in two the reduction approached 50%. Steroid-induced CT changes can mimic treatment responses. If steroids are necessary for symptom control, patients should be taking these medications for 2 weeks before a baseline CT is obtained and investigational treatment started.

Adult↗