Dementia is an acquired syndrome of organic nature, characterized by permanent impairment of memory and other intellectual functions, often associated with psychological and behavioral symptoms without impairment of consciousness. There are psychopathological manifestations.There are different subtypes of dementia. To determine a mild cognitive impairment, the average score of Minimental scale test must be between 21 and 26.

It has been shown that patients with cognitive impairment have a decreased activity of acetylcholine and increased activity of glutamate. Therefore there is a decline in cognitive ability with significant memory impairment and increased aurousal. There is an impairment of cognitive function to perceive, process and use information, which contributes, along with the intelligence, plan and solve problems, learn from the experience, plan tasks and predict results.

For this postulate two fundamental ways in the treatment by use of cholinesterase inhibitors using memantine that blocks NMDA receptors.

However in mild cognitive impairment there is no evidence that these treatments improve patient outcome. Therefore we start treatment with cholinesterase inhibitors when Minimental score between 14 and 24. We'll use cholinesterase inhibitors in combination with memantine when the Minimental score between 10 and 14. We will use only memantine when the score between 3-14. It has been shown that only 30% of mild cognitive impairment progress to dementia. It is important to consider the use of these treatments because it is'nt shown a clear benefit in mild cognitive impairment and have side effects.

Induced delusional disorder (also known as shared paranoid disorder or folie à deux) is an uncommon disturbance characterized by the presence of similar psychotic symptoms in two or more individuals. Most commonly a primary case can be distinguished from other one or more cases, in whom the symptoms are induced. the patients implied in the shared delusional symptoms are frequently linked by close relationship bonds, mostly family ties. Its epidemiology remains unclear, because very few data is available. There are some requirements concerning the persons involved for the development of this disorder:

1. 1. Close coexistence and intimate emotional links between the two people are observed;

2. 2. The delusional content is plausible and can be based on past events or expectations;

3. 3. Typically, the induced individual has an easily influenciable personality.

We describe and comment one case of shared paranoid disorder between a 29 year old schizophrenic patient and her 43 years old sister. both share a persecution and prejudice delusion involving the Chinese community of their hometown. after a few days of inward treatment at separated psychiatric wards, the delusional symptoms in the older sister started to improve.

Our intention is making a review on a diagnosis that remains controversial nowadays. Treatment should begin with the separation of the induced and the inducer. Anyhow, a psychopharmacological treatment is required in both individuals. It seems clear, however, that the prognosis of the induced and the inducer is different, according to a variety of factors.

Ramón y Cajal Hospital is the reference medical centre for Madrid-Barajas airport. Passengers arriving at the airport who need medical assistance are brought to this hospital. A percentage of these passengers require psychiatric evaluation and frequently need to be admitted into the ward for a certain length of time.

Perform a descriptive analysis of the socio-demographic and clinical variables of inward psychiatric patients referred from Madrid-Barajas airport.

Revise retrospectively clinical histories of inward psychiatric patients referred from Madrid-Barajas airport in the last 5 years.

Data is analyzed using the SPSS software 15.0 version.

We collected 99 patients, 54 of them (54.5%) are males. The 38.4% of the sample is in the age range between 25 and 34 years, and the 26.3% are between 35 and 44 years old. The most frequent countries of origin are European countries (57.6% of the sample). 28 patients of that group (49.1%) are Spanish citizens. Other 26% percent of the patients are from Centre or South-America. The most common syndromic diagnosis at discharge is psychotic disorder (62.6%) followed by affective disorder (22.2%).

We can deduce from these data that the usual patient referred from Madrid-Barajas airport to the emergencies department for psychiatric attention is a male, between 25 and 34 years of age, from a European country, with a psychotic disorder that usually ends up in an admission into the psychiatric hospitalization unit.

Ramón y Cajal Hospital is the reference centre for Madrid-Barajas airport. Passengers at the airport who need medical assistance are brought to this hospital. A percentage of these passengers require psychiatric evaluation and frequently need to stay inward for a certain term.

Calculate the approximate costs derived from the inward stay at the Psychiatry ward of patients referred from Madrid-Barajas airport.

Revise retrospectively clinical histories of inward psychiatric patients referred from Barajas airport in the last 5 years. The Department of Economic management of the hospital has provided the costs of stay at the Psychiatry ward for the year 2007 (395 euros per day). Data is analyzed using the SPSS software 15.0 version.

The average stay of these patients is 13.96 days. Then, the average cost is 5514.2 euros. Extrapolating these data to our sample, we notice that being the reference centre for an international airport supposes an estimated cost of 545.905.8 euros (109181.16 per year) due to inward stay of psychiatric patients.

The psychiatric attention to the airport population represents an economic extra charge that has an impact on the hospital and the National Health System. We only expose the charge derived from inward stay. To obtain a more realistic overall result we should add the costs of the attention at the emergency room to the result above.