Ethicist: Both ASA and TPA are clot-dissolving agents.
Background
ASA and TPA are both used for the same purpose, but TPA, which costs more, would save at most two more lives out of every 50 patients.
Conclusion
But financial saving involved in using ASA over TPA must also be weighed against the extra grieving that using ASA could cause.
Evidence
The relatives of patients who die just because they were given the less expensive medicine would be particularly upset.
Evaluate
We start with a couple background facts before we hit the Author's Pivot with the However.
But / yet / however usually signals that we're shifting from background and/or counterpoint claims into the Author's Argument.
But the pivot word itself doesn't tell you whether you'll hear, But Conclusion, because Evidence or But since Evidence, Conclusion
In this case, the "since" shows us that the first half of the last sentence is a Premise and the second half is the Conclusion.
Goal
We need to look for a re-wording of .