This risk factor is also proposed by Santos (2006), who specifically suggested hyperkalaemia, severe hypermagnesaemia and hypocalcaemia as clinical indicators for RDCO. Additionally, Oliva and Cruz (2003) mention that change in potassium level was present in 8·2% (n = 4) of individuals with DCO and Veiga et al. (1996) referred to electrolyte changes as one of the most frequent clinical indicators of DCO. Likewise, Jesus et al. (1996) mentioned that electrolyte changes were suggested as clinical indicators in DCO by 92·3% (n= 12) of experts with a diagnostic content validation score of 0·71. This value is similar to that
found in this research.