[Medication-overuse and chronic headaches in Brazzaville: patients' profile and therapeutic approach]

Medication-overuse headaches (MOHs) are the least studied of all headaches in Africa.

We conducted a longitudinal study in order to describe our experience with patients placed in Neurology Outpatient observation in Brazzaville over a period of 4 years, from September 2010 to August 2014. All patients with chronic primary headaches, according to the International Classification of Headache Disorders (ICHD) (2nd edition), were included in the study. All patient with secondary headaches or who hadn't given consent were excluded. The patients were divided into two groups: those who had progressed to medication-overuse and those who didn't meet the criteria for medication-overuse (without-MOH). The variables used were the sociodemographic characteristics of patients, the clinical features of primary headaches and MOH treatment.

The study population was constituted by 193 patients out of 212. The average age of patients was 42 ± 14 years, of whom 66.32% were women. MOH rate was 35.75%. The associated factors were: early age (p=0.003), concomitant use of nonsteroidal anti-inflammatory drugs (NSAIDs) and paracetamol (p=0.0001) as well as self-medication (p<0.0001). By contrast, higher education (p<0.0001) and the use of NSAID alone (0.002) were protective factors against the onset of MOH. Ambulatory withdrawal was the most practiced treatment and amitriptyline was the most commonly used medication.

Medication-overuse headaches are frequent in patients placed in Neurology Outpatient observation in Africa and deserve identification for a better management.