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Results for “Olfaction Disorders”

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At least 541 records · Page 30Linked to original sources
PubMed2005

Dysfunction of the liver affects the sense of smell.

BACKGROUND: Cirrhosis of the liver (CL) has been reported to be accompanied by olfactory loss. The aim of the present study was to re-investigate previous work with a special focus on differential olfactory function, the relation between CL etiology and olfactory function, and the correlations between laboratory/psychological parameters and olfactory function. MATERIALS AND METHODS: A total of 45 CL patients participated. Olfactory function was tested using the "Sniffin' Sticks" technique, which provides measures for butanol odor thresholds, odor discrimination and odor identification. Serum levels of zinc and bilirubin were obtained. Psychometric measurements included the trailmaking test. RESULTS: The study provided the following major results: (1) Olfactory function was compromised in 76% of CL patients; in addition, the patient's ability to identify odors, but not odor thresholds or odor discrimination, was related to the degree of CL. This pattern may be an expression of a stronger effect of CL on the central- nervous processing of odors than on the periphery of the system. (2) Neither etiology of the CL (e.g., alcoholism) nor serum levels of bilirubin and zinc were correlated with olfactory function. However, (3) there was a relation between the results from psychometric function tests and the ability to identify odors. CONCLUSION: Although the reason for olfactory dysfunction in CL is far from clear, future investigations should focus on the hypothesis that endogenous intoxication may lead to a stronger deficit in the central-nervous processing of olfactory information than to peripheral lesions in the olfactory system. In addition, while more specific research is needed, olfactory dysfunction may serve as a subclinical indicator of hepatic encephalopathy.

Adult↗
PubMed2006

The enigmatic origin of subfrontal schwannomas: report of a case without hyposmia.

Subfrontal schwannomas are rare intracranial tumors. Most of them are associated with hyposmia/anosmia. The source of origin of these tumors is still incompletely understood. We report a 23-year-old male who presented with recurrent focal motor seizures, but had no hyposmia. The tumor was completely removed by a subfrontal approach. Relevant literature has been reviewed.

Adult↗
PubMed2000

Permanent postoperative anosmia: a serious complication of neurovascular decompression in the sitting position.

In posterior fossa surgery, the sitting position offers a number of advantages believed to outweigh complications such as air embolism and pneumatocephalus. For this reason, the sitting position is frequently used in neurovascular decompression for trigeminal neuralgia. Two years ago we reported on a previously undescribed complication: permanent postoperative anosmia. Following the recent occurrence of a second case, we conducted a nationwide survey to determine the frequency of this complication. Permanent postoperative anosmia following surgical procedures in the sitting position has been observed in 3 other institutions. In addition, the survey revealed that only 40% of German neurosurgeons still favor the sitting position for surgery of the posterior cranial fossa. Considering that permanent anosmia severely reduces quality of life, and that it can be avoided by using another position, the sitting position for surgical procedures in the posterior fossa should be restricted to special cases (e.g., brain stem tumors).

Decompression, Surgical↗
PubMed2004

Olfactory function in patients with idiopathic Parkinson's disease: effects of deep brain stimulation in the subthalamic nucleus.

Decrease of olfactory function in patients with Parkinson's disease (PD) is a well-investigated fact. The present study aimed to investigate olfaction in PD patients with a specific focus on the effects of deep brain stimulation in the subthalamic nucleus. Eleven patients (age 42-67 years) participated in this study. Using the "Sniffin' Sticks", olfactory function was assessed based on butanol odor thresholds and the patients' ability to discriminate odors. Measures were taken with the stimulator being switched ON and OFF, respectively. While deep brain stimulation had no effect on odor thresholds, in hyposmic PD patients odor discrimination was found to be significantly higher during the ON period. This may indicate that deep brain stimulation has a positive effect on the cognitive processing of olfactory information in PD patients.

Adult↗
PubMed2005

Olfactory bulb volumes in patients with idiopathic Parkinson's disease a pilot study.

Olfactory loss is among early signs of idiopathic Parkinson's disease (IPD). The present pilot study aimed to investigate whether this loss would be reflected in a decreased volume of the olfactory bulb (OB) established through magnetic resonance imaging. Eleven consecutive IPD patients were compared to 9 healthy, age-matched controls. Results indicated that there is little or no difference between IPD patients and healthy controls in terms of OB volume. Based upon the relation between loss of olfactory input to the olfactory bulb and consecutive decrease in volume, these data support the idea that olfactory loss in IPD is not a primary consequence of damage to the olfactory epithelium but rather results from central-nervous changes.

Adult↗
PubMed2006

Health survey among people living near an abandoned mine. A case study: Jales mine, Portugal.

UNLABELLED: Campo de Jales is a village surrounding the abandoned Jales mine. The area is heavily contaminated with heavy metals and dusts from large tailings piles as result of centuries of mining operations. The aim of this study is to investigate potential health threats associated with site contamination. The population studied comprised two groups: people living in Campo de Jales (n = 229) and a control group - people living in Vilar de Macada (n = 234). Lead and cadmium exposure and symptoms survey were carried out. The results showed a significant higher levels of blood lead and cadmium between the Campo de Jales residents (lead: 9.5 microgr/dl versus 7.7 microgr/dl; cadmium: 0.84 microgr/dl versus 0,65 microgr/dl) as well as to a higher prevalence of respiratory and irritation symptoms and great concern about his own health. IN CONCLUSION: community is the scene of long-term health problems resulting from the site environmental contamination.

Adolescent↗
PubMed2006

Management of a sporadic malignant subfrontal peripheral nerve sheath tumor.

Malignant subfrontal (olfactory) peripheral nerve sheath tumors (MPNSTs) are exceedingly rare. Although meningiomas are the most common subfrontal extra-axial lesions, it is important to recognize that MPNSTs, which are radiographically similar to meningiomas, can also be present in this location. MPNSTs require more aggressive surgical and postoperative management than meningiomas. In this paper, we describe a patient with a subfrontal MPNST with unusual histological characteristics and present a review of the literature. A 49-year-old woman presented with chronic sinusitis and progressive headaches. A neurological examination revealed left-sided anosmia. Brain-imaging studies revealed a large left subfrontal mass with extension into the frontal and ethmoid sinuses and the nasal cavity. The patient underwent both a bifrontal transbasal craniotomy and a transnasal approach for an attempt at total resection of both the intradural and extradural components of the MPNST. The patient was treated postoperatively with radiation therapy, and had no evidence of recurrence at her follow-up examination 1-year after treatment. Subfrontal PNSTs are extremely rare and usually benign. The specific cell and nerve of origin for these tumors remains unknown. Our case shows that these rare lesions can present as a malignant variant and thus require aggressive surgical and postoperative management to provide long-term tumor control.

Adult↗
PubMed2005

Changes in mitotic rate and GFAP expression in the primary olfactory axis of streptozotocin-induced diabetic rats.

Many diabetic individuals develop anosmia but the mechanism(s) causing the dysfunction in the olfactory system is (are) unknown. Glial fibrillary acidic protein expression is reduced in diabetic retinopathy and is also reduced, with unknown consequences, in other brain regions of diabetic rats. We used immunohistochemistry and immunoblotting from untreated control and streptozotocin-induced type 1 (insulin dependent) diabetic rats to investigate main olfactory epithelial mitotic rate and glial fibrillary acidic protein expression in the lamina propria of the sensory epithelium and in the olfactory bulb. Numbers of bromodeoxyuridine-positive cells were significantly lower in the diabetic sensory epithelium compared to non-diabetic controls. Immunohistochemical observations suggested a qualitative difference in glial fibrillary acidic protein expression in both regions examined especially in the olfactory bulb external plexiform layer and the lamina propria. Immunoblot analysis confirmed that the diabetic olfactory bulb and lamina propria expressed less glial fibrillary acidic protein compared to the non-diabetic control group. The lower expression levels in the olfactory bulb external plexiform layer suggested by immunohistochemistry do not reflect a change in the number of astrocytes since the numbers of S100B(+) cells were not different between the two groups.

Animals↗
PubMed1975

Anosmia and hypogonadism with ovarian mosaicism.

An 18-year-old woman with anosmia and hypogonadotropic hypogonadism is presented. In addition endocrinologic evaluation revealed an apparent deficiency in pituitary growth hormone secretion in response to hypoglycemia and an ovarian insensitivity to exogenous gonadotropins. The ovaries, which on histologic examination appeared to be normal, upon karyotyping showed a chromosomal mosaicism, probably 46, XX/47, XXF+.

Adolescent↗
PubMed1976

Ovarian morphology in women with anosmia and hypogonadotropic hypogonadism.

Ovarian biopsies from five women with the syndrome of hypogonadotropic hypogonadism and anosmia who had not previously received exogenous gonadotropins were evaluated with special emphasis on follicular morphology. Follicular development past the primordial stage was rarely observed, suggesting that early stages of follicular maturation require amounts of gonadotropins in excess of those secreted in these women.

Female↗
PubMed1982

Clinical and computed tomographic findings in the Foster Kennedy syndrome.

A 52-year-old man had progressive loss of visual acuity in his left eye associated with anosmia of five years duration. Clinical findings included papilledema in the right eye and optic atrophy in the left eye. A diagnosis of Foster Kennedy syndrome was made. Careful attention to the ophthalmoscopic appearance of the left eye disclosed optic disk swelling in regions without significant atrophy as well as dilated retinal veins. Both of these signs suggested increased intracranial pressure, rather than a primary anterior ischemic optic neuropathy. High resolution computed tomographic scanning confirmed the presence of a large subfrontal meningioma and an expanded right optic nerve sheath, consistent with the papilledema noted clinically.

Frontal Lobe↗