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Biomedical subjects

P Lass

Publications and source records attributed to P Lass.

54 records · Page 3Linked to original sources

[Femoro-crural reconstruction in Denmark 1983-1987].

From 1983 to 1987, 293 femoro-crural bypasses were performed in eight centers for vascular surgery in Denmark. The activity increased in the period from 15 to 135 bypasses per year. The increase took place particularly 1986, when the in situ saphenous vein bypass was introduced in Denmark. A total of 203 bypasses were performed at the University Hospital of Copenhagen, Rigshospitalet: 108 in situ bypasses, 51 bypasses with arterial protheses and 44 bypasses using reversed vein. The cumulated graft patency after one year was 76% for the in situ bypasses, 26% for the bypasses with arterial protheses and 32% for reversed vein. The cumulated limb survivals after one year were 90%, 66% and 63%, respectively.

Adult↗

Surgical treatment of Achilles tendon ruptures.

A total of 75 patients with surgically repaired Achilles tendon ruptures were evaluated with special reference to the status at the end of a standardized short period of cast immobilization (6 weeks). There were 3 (4%) reruptures caused by new adequate trauma, but no other major complications. The final functional result was evaluated with reference to the patients' return to social and recreational activities. Objective measurements reflecting the final functional result are discussed.

Achilles Tendon↗

Impaired beta-adrenergic mediated cerebral blood flow response in streptozotocin diabetic rats.

The influence of intracarotic infusion of isoproterenol on cerebral blood flow, on cerebrovascular CO2-reactivity, and on cerebral glucose metabolism were investigated in streptozotocin diabetic rats. Resting cerebral blood flow in diabetic rats decreased by 26% from a control value of 90 ml/100 g.min. to 66 ml/100 g.min. Intracarotid isoproterenol infusion leads to a significant increase in cerebral blood flow in both groups. The increase in cerebral blood flow in control rats (70%), significantly exceeded that in the streptozotocin diabetic rats (33%). Cerebrovascular reactivity to carbon dioxide was preserved after isoproterenol infusion in both groups and there was no significant difference in the relative cerebral blood flow increase in the two groups. Cerebral glucose metabolism was also unaffected by the isoproterenol infusion. The results indicate that impaired beta-adrenergic mechanisms may play a role for alterations in cerebral blood flow that is seen in diabetes mellitus.

Animals↗

Achilles tendon rupture in badminton.

The typical badminton player with an Achilles tendon rupture is 36 years old and, despite limbering up, is injured at the rear line in a sudden forward movement. He resumes work within three months and has a slight lack of dorsiflexion in the ankle as the main complication. Most patients resume badminton within one year, but some finish their sports career, mainly due to fear of a new injury. The investigation discusses predisposing factors and prophylactic measures.

Absenteeism↗

Cerebral blood flow response to propranolol in streptozotocin diabetic rats.

The influence of propranolol on cerebral blood flow (CBF) was tested in streptozotocin diabetic rats and in control animals. Resting CBF values were 40% lower in the diabetic rats compared with controls. Intravenous injection of propranolol (2 mg kg-1) decreased CBF significantly in the control group; the CBF decreased for 15 min after propranolol injection and returned to baseline values after 90 min. In the diabetic rats, the CBF declined steadily but this decrease did not reach significance, even after 90 min. Impaired beta-adrenergic mechanisms may be an important factor in the CBF alterations which occur in diabetes mellitus. Further, it is suggested that an impaired CBF response may play a role in CNS lesions in diabetic patients treated with beta antagonists.

Animals↗

[Cortico-basal degeneration. Diagnosis and differentiation and the description of the first case in Poland].

Idiopathic Parkinson Disease accounts for approximately 75% of all cases of parkinsonism. The described case of Corticobasal Degeneration (CBD), until now not presented in Polish medical literature is a relatively rare example of so-called "parkinson plus" syndrome. The authors present the case of a 56 years old woman with asymmetric onset of rigidity and atypical tremor of upper extremity followed by gait disturbances (gait apraxia), dysarthria, bilateral pyramidal signs and myoclonus. Complete lack of clinical improvement after treatment with L-dopa and progressive character were observed from the onset of the disease. The presented case seems to be helpful in differential diagnosis of parkinson plus syndromes and specially CBD, which seems to be difficult in the first stages of the disease. Although the case was not neuropathologically verified (patient is still alive) the diagnosis seems to be almost true.

Basal Ganglia↗

[Brain perfusion changes after head trauma assessed by cerebral SPECT with aminophylline test].

Tomographic cerebral blood flow SPECT scanning using Tc-99m-HMPAO was performed before and after i.v. administration of aminophylline in 36 patients between 6 months to 11 years after closed head trauma. Asymmetries of brain perfusion were found in 34 patients, normal rCBF distribution in 2 patients. Bi-focused asymmetries on the presumed line: trauma-contra coup were seen in 64% of the patients. In 70.4% of the patients with brain perfusion asymmetries the CT scan was normal. The aminophylline test improved the perfusion in 42% of the patients, indicating preserved perfusion reserve. Persistence of brain perfusion alterations after head trauma exists. Aminophylline test may be useful in the assessment of brain perfusion reserve in post-traumatic focus. Brain perfusion SPECT scans may be useful for medico-legal purposes.

Acetazolamide↗

[Tc-99m-MIBI and Tc-99m-HMPAO accumulation in primary and metastatic brain tumors assessed by brain SPECT].

Imaging of intracranial lesions is frequently difficult in CT/MRI diagnosis. The introduction of the encephalic tracer MIBI seemed to be a promising alternative. We tried to compare the accumulation of Tc-99m-MIBI and HMPAO CT/MRI interpretationeally difficult intracranial lesions. We did SPECT scanning with single-head and triple-head gammacamera after i.v. administration of Tc-99m-HMPAO/MIBI. We performed HMPAO scanning in 34 patients, MIBI scanning in 41 pts. CT and MRI scanning was performed simultaneously. Histological diagnosis was done intra- and/or postoperatively. Increased accumulation of Tc-99m-MIBI was seen in 7/7 meningiomas (100%), 7/9 gliomas (77%), 10/15 brain metastases (66%), 2/4 unverified. In 5 cases with finally non-neoplastic diagnosis (stroke, a-v malformation) no MIBI accumulation was seen. Increased accumulation of HMPAO was seen in 3/11 gliomas, 2/7 meningiomas, 2/8 metastases and 2/4 unverified. In 4 cases non-neoplastic diagnosis was established. Our results seem to be less promising, than reported so far, particularly for heterogeneous accumulation of MIBI in metastatic tumours. The coupled Tc-99m-MIBI/HMPAO scanning may be useful in primary tumour diagnosis, particularly in meningiomas.

Brain↗

[Tomographic cerebral blood flow scanning in diagnosis of psychiatric disorders].

The paper summarises the role of tomographic cerebral blood flow SPECT scanning in psychiatric diagnostics, its' physical and radiopharmaceutical basis, pathological physiology of cerebrovascular circulation in psychiatric disorders and interpretation of cerebral blood flow scanning results by the clinician. Cerebral blood flow scanning is, to some extent, a functional equivalent of CT/MRI scanning. In psychiatry cerebral blood flow SPECT scanning's basic application is the differentiation of dementia and cognitive impairment, in particular Alzheimer's disease, frontotemporal lobar degeneration and multi-infarct dementia. The other indications for brain SPECT scanning involve the organic brain lesions and medico-legal diagnostics, including the sequelae of cranio-cerebral trauma. Contraindications and economical aspects are underlined.

Frontal Lobe↗

[New diagnostic criteria for the neuropsychiatric form of systemic lupus erythematosus].

Systemic lupus erythematosus (SLE) is an autoimmunologic illness, which apart from changes in the skin, the locomotor system and the internal organs, attacks also the nervous system. The paper presents 19 neuropsychiatric symptomic syndromes which after conduction of multidisciplinary, international research were accepted by the American College of Rheumatology (ACR) as the criteria of systemic lupus erythematosus (SLE). This broadens the criteria applied since 1982, which were only considering acute symptoms and psychoses as characteristic of the neuropsychiatric form of systemic lupus erythematosus (NPSLE). In the new neurologic criteria concerning the CNS are: epileptic attacks and acute attack disorders, headaches, vascular diseases, demyelinating syndrome, aseptical meningitis, chorea, myelopathy. Psychiatric syndromes which make up the new criteria are: acute amentive state, anxiety disorders, cognitive function impairment, affective disorders, psychoses. The criteria connected to the CNS are: cranial nerve damage, mononeuropathy, damage of nerve plexus, polyneuropathy, vegetative neuropathy, myasthenia and acute inflammatory demyelinating polyneuropathy. Clinical symptoms of these syndromes were set and laboratory and visualising tests were developed, which are useful in their diagnosis. The intention of the ACR in setting new, significantly broader criteria of NPSLE, was to stress the diversity of symptoms and for a practical aspect to allow the diagnosis of NPSLE in patients having this disease, in whom the symptoms connected with the nervous system may dominate in the clinical picture, or may be before the dermatological, locomotor or internal organ symptoms.

Humans↗