Table II.
Volumes of donor red cells (VGR) exchanged during the exchange transfusion. At each cycle, blood is first withdrawn and then transfused. In the first cycle, no donor red cells are in the circulation during the withdrawal step. DS is the volume of donor red cells transfused at each cycle
| Withdrawal step | Transfusion step | ||
|---|---|---|---|
| CYCLE | Removed VGR | Remaining VGR | Final VGR |
| 1 | 0 | 0 | DS |
| 2 | a × DS | b × DS | DS + b × DS |
| 3 | a × (1 + b) × DS | (b + b2) × DS | (1 + b + b2 ) × DS |
| 4 | a × (1 + b + b2) × DS | (b + b2 + b3) × DS | (1 + b + b2 + b3) × DS |
| … | … | … | … |
| n | a × (1 + b + b2 +…+ bn−2 ) × DS | (b + b2 +…+ bn−1 ) × DS | (1 + b + b2 +…+ bn−1 ) × DS |