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     Parkinsons
Parkinson's
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Parkinsons - Clinical
Information On Parkinsons DiseaseThe primary cause for developing the Parkinson's disease is the widespread damage of the dopamine-producing cells in a person's ..... Are you searching for some inside or more defined advice on medicine for parkinsons disease ? Here's an up-to-date report from medicine for parkinsons disease experts who ought to be able to give you a clearer understanding.
History: Onset of PD is typically asymmetric, with the most common initial finding being an asymmetric resting tremor in an upper extremity. About 20% of patients first experience clumsiness in one hand. Over time, patients notice symptoms related to progressive bradykinesia, rigidity, and gait difficulty.
Tremor usually begins in one upper extremity and initially may be intermittent. As with most tremors, the amplitude increases with stress and resolves during sleep. After several months or as much as a few years, the tremor may affect the extremities on the other side, but asymmetry usually is maintained. PD tremor may also involve the tongue, lips, or chin.
The initial symptoms of PD may be nonspecific and include fatigue, depression, constipation, and sleep problems.
Some patients experience a subtle decrease in dexterity and may notice a lack of coordination with activities such as playing golf or dressing.
Some patients complain of aching or tightness in the calf or shoulder region.
The first affected arm may not swing fully when walking, and the foot on the same side may scrape the floor.
Over time, axial posture becomes progressively flexed and strides become shorter.
Decreased swallowing may lead to excess saliva in the mouth and ultimately drooling.
Symptoms of autonomic dysfunction are common and include constipation, sweating abnormalities, sexual dysfunction, and seborrheic dermatitis.
Sleep disturbances are common.
The best clinical predictors of a pathologic diagnosis of PD are the following:
Asymmetry
Presence of resting tremor
Good response to dopamine replacement therapy
Physical: The 3 cardinal signs of PD are resting tremor, rigidity, and bradykinesia. Of these cardinal features, 2 of 3 are required to make the clinical diagnosis. Postural instability is the fourth cardinal sign, but it emerges late in the disease, usually after 8 years or more.
The characteristic PD tremor is present and most prominent with the limb at rest.
The usual frequency is 3-5 Hz.
The tremor may appear as a pill-rolling motion of the hand or a simple oscillation of the hand or arm.
The same tremor may be observed with the arms outstretched (position of postural maintenance) and a less prominent, higher frequency kinetic tremor is also common.
Rigidity refers to an increase in resistance to passive movement about a joint.
The resistance can be either smooth (lead pipe) or oscillating (cogwheeling).
Cogwheeling is thought to reflect tremor rather than rigidity and may be appreciated in tremors not associated with an increase in tone (ie, essential tremor).
Rigidity usually is tested by flexing and extending the patient's relaxed wrist.
Rigidity can be made more obvious with voluntary movement in the contralateral limb.
Bradykinesia refers to slowness of movement but also includes a paucity of spontaneous movements and decreased amplitude of movement. Bradykinesia also is expressed as micrographia (small handwriting), hypomimia (decreased facial expression), decreased blink rate, and hypophonia (soft speech).
Postural instability refers to imbalance and loss of righting reflexes. Its emergence is an important milestone, because it is poorly amenable to treatment and a common source of disability in late disease.
Patients may experience freezing when starting to walk (start-hesitation), during turning, or while crossing a threshold, such as going through a doorway.
Dementia generally occurs late in PD and affects 15-30% of patients. Short-term memory and visuospatial function may be impaired, but aphasia is not present. Cognitive dysfunction within a year of onset of motor features suggests a diagnosis of Lewy body disease, a disease closely related to PD and marked by the presence of cortical Lewy bodies.
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Parkinson'swo participants in a discontinued clinical drug trial have sued Amgen, demanding that it ..... Causes: Most cases of idiopathic PD are believed to be due to a combination of genetic and environmental factors. At both ends of the spectrum are rare cases that appear to be due solely to one or the other.
Environmental risk factors associated with the development of PD include use of pesticides, living in a rural environment, consumption of well water, exposure to herbicides, and proximity to industrial plants or quarries.
Several individuals have been identified who developed parkinsonism after self-injection of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP).
These patients developed bradykinesia, rigidity, and tremor, which progressed over several weeks and improved with dopamine replacement therapy.
MPTP crosses the blood-brain barrier and is oxidized to MPP+ by the enzyme monoamine oxidase (MAO) type B.
MPP+ accumulates in mitochondria and interferes with the function of complex I of the respiratory chain.
A chemical resemblance between MPTP and some herbicides and pesticides suggested that an MPTP-like environmental toxin might be a cause of PD, but no specific agent has been identified. Nonetheless, mitochondrial complex I activity is reduced in PD, suggesting a common pathway with MPTP-induced parkinsonism.
The oxidation hypothesis suggests that free radical damage, resulting from dopamine's oxidative metabolism, plays a role in the development or progression of PD.
The oxidative metabolism of dopamine by MAO leads to the formation of hydrogen peroxide. Hydrogen peroxide normally is cleared rapidly by glutathione.
If hydrogen peroxide is not cleared adequately, it may lead to the formation of highly reactive hydroxyl radicals that can react with cell membrane lipids to cause lipid peroxidation and cell damage. In PD, levels of reduced glutathione are decreased, suggesting a loss of protection against formation of free radicals. Iron is increased in the substantia nigra and may serve as a source of donor electrons, thereby promoting the formation of free radicals.
Indices of lipid peroxidation are increased in PD.
Thus, PD is associated with increased dopamine turnover, decreased protective mechanisms (glutathione), increased iron (a pro-oxidation molecule), and evidence of increased lipid peroxidation. This hypothesis raised concern that increased dopamine turnover due to levodopa administration could increase oxidative damage and accelerate loss of dopamine neurons. However, currently no evidence suggests that levodopa accelerates disease progression in patients with PD.
The role of genetic factors has been studied in twins.
If genetic factors are important, concordance in genetically identical monozygotic (MZ) twins will be greater than in dizygotic (DZ) twins, who share only about 50% of genes. Early twin studies generally found low and similar concordance rates for MZ and DZ pairs.
Parkinsons MedicineA warm welcome to Parkinson's Disease Help Online and thank you for taking the ..... In a recent study of 193 twins, overall concordance for MZ and DZ pairs was similar. However, in 16 pairs of twins in whom PD was diagnosed at or before age 50 years, all 4 MZ pairs, but only 2 of 12 DZ pairs, were concordant. This suggests that while genetic factors may not be very important when the disease begins after age 50 years, genetic factors appear to be very important when the disease begins at or before age 50 years.
The identification of a few large families with apparent familial PD sparked further interest in the genetics of the disease.
One large family with highly penetrant, autosomal-dominant, autopsy-proven PD originated in the town of Contursi in the Salerno province of southern Italy. Of 592 family members, 50 were affected by PD. These individuals were characterized by early age of disease onset (mean age 47.5 y), rapid progression (mean age at death 56.1 y), lack of tremor, and good response to levodopa therapy.
Linkage analysis incriminated a region in chromosome bands 4q21-23, and sequencing revealed an A-for-G substitution at base 209 of the alpha-synuclein gene. Termed PD-1, this mutation codes for a substitution of threonine for alanine at amino acid 53.
Five small Greek kindreds also were found to have the PD-1 mutation. In a German family, a different point mutation in the alpha-synuclein gene (a substitution of C for G at base 88, producing a substitution of proline for alanine at amino acid 30) confirmed that mutations in the alpha-synuclein gene can cause PD. A few additional familial mutations in the alpha-synuclein gene have been identified and are now collectively called PARK1. It is now clear that these mutations are an exceedingly rare cause of PD.
Alpha-synuclein is a major component of Lewy bodies in all PD.
All Lewy bodies stain for alpha-synuclein, and most also stain for ubiquitin, which conjugates with proteins targeted for proteolysis. Abnormal aggregation of alpha-synuclein into filamentous structures may precede ubiquitization.
One hypothesis states that the PD-1 mutation alters the configuration of alpha-synuclein into a ß structure that could aggregate into sheets.
All PD may be associated with abnormal folding of alpha-synuclein, leading to excessive aggregation and neuronal death.
Although sporadic PD is not caused by a mutation in the alpha-synuclein gene, active investigation is underway into proteins that interact with alpha-synuclein, including those that guide, promote, or prevent aggregation of the protein.
As PD, dementia with Lewy bodies, and multiple system atrophy (MSA) all exhibit Lewy bodies that stain for alpha-synuclein, they have been designated “alpha-synucleinopathies.”
A recent hypothesis suggests that PD is caused by abnormalities of the proteosome system, which is responsible for clearing abnormal proteins.
Several homozygous deletions in a gene dubbed Parkin (Park2), which is located on chromosome 6, have been found to cause autosomal-recessive juvenile parkinsonism (AR-JP). This form of parkinsonism differs pathologically from PD in that no Lewy bodies are found in the substantia nigra.
Several other gene abnormalities have been identified in families with PD and these are designated Park3-Park12.
It has been estimated that all currently known genetic causes of PD account for less than 5% of PD cases.
Parkinsons TreatmentMedical Care: The goal of medical management of PD is to provide control of signs and symptoms for as .....
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