Questions regarding Dialysis study

1. Is the sudden drop of bleed pressure defined as number or percentage? Is it compared with the previous record or the baseline record? And should both systolic and diastolic blood pressure drop be taken into consideration?

2. If we want to explore whether temperature has any effect on blood pressure, should the normal fluctuation of blood pressure without dialysis for each subject also be recorded as control?

3. Are you interested in the episode or time if sudden drop happens? i.e. if hypotension exists for two subjects, but arrives at different times, are they treated the same or not?