Mortality attributed to hereditary haemorrhagic telangiectasia and geographical variability in Spain (1981-2016)

Abstract

Objective: To identify the mortality directly attributed to hereditary haemorrhagic telangiectasia (HHT) in Spain, and to analyze its time trends and geographic variability. Method: Population-based deaths due to HHT were selected from the Spanish National Statistics Institute: codes 448.0 (ICD-9, 1981-1998) and I78.0 (ICD-10, 1999-2016) as the basic cause of death. Specific and age-adjusted mortality rates were calculated by sex, as well as standardized mortality ratios (SMR) by province and district, and smoothed SMR. Results: We identified 327 deaths attributed to HHT (49.5% women), with the highest mortality at 80-84 years in men (0.220 per 100,000 inhabitants) and at 75-79 years in women (0.147 per 100,000 inhabitants). Age-adjusted mortality rates did not show any significant time trend between 1981 and 2016 in Spain. The provinces of Navarra, Cantabria, Guipúzcoa, Pontevedra and Las Palmas had higher than expected mortality, as well as the regions of Monte Sur (Ciudad Real) and Ripollès (Girona). Conclusions: This study has identified some regions with higher risk of death due to HHT in Spain. It is unknown whether these differences are associated with the distribution of types HHT1 and HHT2, and further studies will be necessary to know the determinants of this geographical variability. These findings are useful to complement the information provided by other studies and registries, and for health planning.