Progressive supranuclear palsy (PSP) (or the Steele-Richardson-Olszewski syndrome, after the Canadian physicians who described it in 1963) is a rare degenerative disorder involving the gradual deterioration and death of selected areas of the brain.
The sexes are affected approximately equally and there is no racial, geographical or occupational predilection. Approximately 6 people per 100,000 population have PSP.
The initial symptom in two-thirds of cases is loss of balance and falls. Other common early symptoms are changes in personality or general slowing of movement.
Later symptoms and signs are dementia (typically including loss of inhibition and ability to organize information), slurring of speech, difficulty swallowing, and difficulty moving the eyes, most specifically in the downward direction.
Some of the other signs are poor eyelid function, contracture of the facial muscles, a backward tilt of the head with stiffening of the neck muscles, sleep disruption, urinary incontinence and constipation.
There is currently no effective treatment for PSP, although some of the symptoms can respond to nonspecific measures. The average age at symptoms onset is 63 and survival from that point averages 7 years with a wide variance.
and the spinal cord, particularly the area where some control of the bladder and bowel resides.
Fewer than 1% of those with PSP have a family member with the same disorder. A variant in the gene for tau protein called the H1 haplotype, located on chromosome 17, has been linked to PSP. Nearly all people with PSP received a copy of that variant from each parent, but this is true of about two-thirds of the general population. Therefore, the H1 haplotype appears to be necessary but not sufficient to cause PSP. Other genes and environmental toxins are being investigated as other contributors to the cause of PSP.
Actor Dudley Moore, who suffered from progressive supranuclear palsy, increased public awareness of this disease. He died on March 272002 from its complications.
Lee Philips, the 1950s actor-turned-director of such shows as Peyton Place and The Ghost & Mrs. Muir, also died after suffering from this disease.
American singer Teresa Brewer ("Music! Music! Music!"), 76, died of this disease on October 17, 2007.
Several international organizations serve the needs of patients with PSP and their families and support research. The Society for PSP ("CurePSP") is based in the US and the PSP Association is based in the UK.
^ Richardson JC, Steele J, Olszewski J. Supranuclear ophthalmoplegia, pseudobulbar palsy, nuchal dystonia and dementia. A clinical report on eight cases of "heterogeneous system degeneration". Trans Am Neurol Assoc 1963;88:25-9. PMID 14272249.
^ Steele JC, Richardson JC, Olszewski J. Progressive supranuclear palsy: a heterogeneous degeneration involving brain stem, basal ganglia and cerebellum with vertical gaze and pseudobulbar palsy, nuchal dystonia and dementia. Arch Neurol 1964;10:333-359. PMID 14107684.