for k in range(len(opsezi)):
    j=0;
    for i in range(opsezi[k][0],opsezi[k][0]-int(fs/15),-1):
        vrednost = np.round(ekg_filtered2[i],decimals=2)
        j = j + 1
        najdeno=np.where(np.round(ekg_filtered2[(opsezi[k][0]-int(fs/15)):(opsezi[k][0]-j)],decimals=2)==vrednost)
        if (len(najdeno[0]) != 0):
            break;
    opsezi[k][0] = opsezi[k][0]-j