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BMC Health Services Research

, 7:106

First Online: 10 July 2007Received: 09 October 2006Accepted: 10 July 2007DOI: 10.1186-1472-6963-7-106

Cite this article as: Menckeberg, T.T., Belitser, S.V., Bouvy, M.L. et al. BMC Health Serv Res 2007 7: 106. doi:10.1186-1472-6963-7-106

Abstract

BackgroundIn order to accurately distinguish gaps of varying length in drug treatment for chronic conditions from discontinuation without resuming therapy, short-term observation does not suffice. Thus, the use of inhalation corticosteroids ICS in the long-term, during a ten-year period is investigated. To describe medication use as a continuum, taking into account the timeliness and consistency of refilling, a Markov model is proposed.

MethodsPatients, that filled at least one prescription in 1993, were selected from the PHARMO medical record linkage system RLS containing >95% prescription dispensings per patient originating from community pharmacy records of 6 medium-sized cities in the Netherlands.

The probabilities of continuous use, the refilling of at least one ICS prescription in each year of follow-up, and medication free periods were assessed by Markov analysis. Stratified analysis according to new use was performed.

ResultsThe transition probabilities of the refilling of at least one ICS prescription in the subsequent year of follow-up, were assessed for each year of follow-up and for the total study period.

The change of transition probabilities in time was evaluated, e.g. the probability of continuing ICS use of starters in the first two years 51% of follow-up increased to more than 70% in the following years. The probabilities of different patterns of medication use were assessed: continuous use 7.7%, cumulative medication gaps 1–8 years 69.1% and discontinuing 23.2% during ten-year follow-up for new users. New users had lower probability of continuous use 7.7% and more variability in ICS refill patterns than previous users 56%.

ConclusionIn addition to well-established methods in epidemiology to ascertain compliance and persistence, a Markov model could be useful to further specify the variety of possible patterns of medication use within the continuum of adherence. This Markov model describes variation in behaviour and patterns of ICS use and could also be useful to investigate continuous use of other drugs applied in chronic diseases.

Electronic supplementary materialThe online version of this article doi:10.1186-1472-6963-7-106 contains supplementary material, which is available to authorized users.

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Autor: Tanja T Menckeberg - Svetlana V Belitser - Marcel L Bouvy - Madelon Bracke - Jan-Willem J Lammers - Jan AM Raaijmakers

Fuente: https://link.springer.com/



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