Frailty and Cognitive Function in Parkinson's Disease.

Fried's Frailty Phenotype proposed in the Cardiovascular Health Study consists of 5 criteria: unintentional weight loss, exhaustion, low physical activity, reduced grip strength, and reduced gait speed. It has a total score ranging from 0 to 5. A frail person is who scores 3 to 5; prefrail when scores 1 to 2, and robust when scores 0.

The Clinical Frailty Scale (CFS) was proposed in the Canadian Study of Health and Aging. It is a hierarchical scale of 9 levels ranging from 1, the best state of health, to 9, the worst situation: fit, well, well managed, vulnerable, mildly frail, moderately frail, severely frail, very severely frail, terminally ill.

Parkinson's Disease Cognitive Rating Scale (PD-CRS): It is a scale designed to detect the entire spectrum of cognitive dysfunction that occurs in the course of PD. It consists of nine cognitive tasks distributed in two sub-scores, with a maximum score of 134 points: fronto-subcortical (fixation verbal memory 12 points, maintained attention 10 points, working memory 10 points, drawing a clock 10 points, deferred verbal memory 12 points, alternating verbal fluence 20 points, action verbal fluence 30 points) and posterior cortical (denomination by confrontation 20 points and copy of a clock 10 points).

Maximum level of education attained. Qualitative variable in 5 categories: illiterate (cannot read or write), no education (incomplete primary education), complete primary education, secondary education and university education.

The number of months since the patient was diagnosed with Parkinson's disease or Parkinsonism will be recorded.

Number of different drugs normally taken by the patient assessed in 24 hours. The consumption of more than 6 drugs will be considered polymedication.

The number of falls suffered in the last year will be collected.

It is evaluated according to the Charlson comorbidity index. This scale consists of 19 items. Absence of comorbidity between 0 and 1 points, low comorbidity 2 points, high comorbidity between 3 and 5 points and severe comorbidity more than 5 points is considered.

This scale indicates the degree of severity of the disease. It is divided into 6 states. Part of State 0 where there are no symptoms of the disease, until State 5 where the patient is totally dependent.

This tool allows to study the symptoms and the evolution of the disease. It is a scale that is subdivided into 4 parts. Part I: non-motor experiences of daily life, comprising 13 items; Part II: motor experiences of daily life, comprising 13 items; Part III: motor exploration, covering 18 items; and Part IV: motor complications, including 6 items. Each question is evaluated from 0 to 4, where 0 is normal and 4 the greater severity, the higher the score the greater involvement (greater impact of PD symptoms).

The Spanish version of the questionnaire Parkinson s disease quality of life questionnaire (PDQ39) is used. It consists of 39 items with 5 possible answers. 8 dimensions are analyzed: mobility, daily life activities, emotional well-being, stigma, social support, cognitive impairment, communication and body discomfort. The higher the score, the greater the impact on quality of life.

Functional independence is measured using the Barthel index. It has a total score ranging from 0 to 100, where 0 is the minimum (worst outcome) and 100 is the maximum (best outcome).

Functional independence is measured with the Lawton and Brody Questionnaire. Instrumental activities of daily living assesses the ability to use the telephone, shop, use transport, cook, do household chores, take medication and manage finances. It has a total score ranging from 0 to 8, with 0 indicating total dependence and the maximum score indicating total independence.

Physical performance is measured using the Brief Physical Performance Battery. This measure consists of walking 4 m, a balance test with 3 levels (tandem, semi-tandem and feet together) and sitting and reaching 5 times as fast as possible. Total scores range from 0 to 12, with higher scores denoting higher physical performance.

Assesses balance, walking difficulties and decreased strength in lower limbs. This test consists of asking the person to get up from a chair with armrests, walk 3 meters, back and sit again, timing the time spent. 10 seconds or less: correct time. Between 10 and 20 seconds: frail marker. Between 20 and 30 seconds risk of falling. More than 30 seconds: high risk of falls.

It is measured according to the Holden Ambulation Classification (FAC). It consists of 6 response categories, from the value 0 (no gear) to the value 5 (independent gear including up and down stairs).