<qa>  What is the final safety blood sample collected at time point 270 min?A final safety blood sample will be collected at time point 270 min for plasma sodium, potassium, creatinine and BNP, NT-proBNP, sodium, potassium, creatinine, GPT, gamma-GT, total bilirubin to ensure that NT-proBNP levels returned to baseline and other parameters are within the normal range. 