Philadelphia, PA, March 11, 2013 Antipsychotic administration in the elderly is associated with an increased risk for cerebrovascular accident, more commonly known as stroke; a new study published in Biological Psychiatry provides additional insight into this important relationship.
Antipsychotics are prescribed to elderly patients to treat symptoms such as agitation, psychosis, anxiety, insomnia, and depression. The increased risk of stroke associated with these medications was identified approximately a decade ago and has since been replicated by subsequent studies. Although the increase in stroke risk is small, some guidelines discourage the prescription of antipsychotics to elderly patients.
Antipsychotic drugs vary in their effects on the body and so it is likely that antipsychotics are not uniform in their effects on stroke risk. Thus, better understanding of the mechanisms through which antipsychotics increase stroke risk might guide the prescription of safer drugs for elderly patients.
In their study, Wu and colleagues focused on the wide range of brain mechanisms targeted by antipsychotic medications. All antipsychotics block the D2 subtype of receptor for the neurotransmitter dopamine. However, these drugs also act on a range of other receptor targets including the serotonin 5-HT2 receptor, the M1 receptor for the transmitter acetylcholine, and the alpha2 receptor for noradrenaline.
To conduct the study, the researchers matched information from a large national database of insurance claims to what is known about the receptor binding profiles of the antipsychotic drugs.
"We found that antipsychotics with a high binding affinity of alpha2 adrenergic and M1 muscarinic receptors were associated with a greater risk of stroke than the use of other types of antipsychotics," said Dr. Susan Shur-Fen Gau, Professor and Chair at National Taiwan University and corresponding author of the study.
|Contact: Rhiannon Bugno|