Other causes of BS include mutations in the potassium voltage-gated channel subfamily J member 1 (KCNJ1) for Type II BS, chloride channel Kb (ClC-Kb) for Type III BS, Bartter syndrome, infantile, with sensorineural deafness (BSND) for Type IV BS, and calcium-sensing receptor (CaSR) for Type V BS [11]. The gene discussed is CASR; the disease is Bartter disease type 4A.