Since in the same year a person could potentially have been exposed to different substances, parallel exposures to multiple substances reported in the SCL during the same year were registered.
It was found to be much narrower in patients ≥ 6593%3% alcohol, 1% cannabis, 4% multiple substance, 1% benzodiazepines) versus (42% alcohol, 18% cannabis, 5% cocaine and 32% multiple substances, 3% other) in those < 65 (Pchi2 & LRc2, p < 0.001).
In drug users, too, a decrease in substance use led to improvement in HRQoL: Richter et al. [ 7] (2004; 100 multiple substance users in Germany) found a significant improvement in the SF-36 domains of "general health" and "physical functioning" in 48 patients at follow-up.
The safe holds nothing but pristine keys, hundreds of them, one for every door at the $44 million building where Mr. Carney, 41, a multiple offender and multiple substance abuser in his angry-young-man 20s, became the primary caretaker — and first tenant — last summer.
None of these estimates of risk of injury related to drinking have taken into consideration other drug use at the time of injury, although multiple substances commonly are used together in ED populations (Buchfuhrer and Radecki 1996).
Hemofiltration is selective in the sense that it will affect circulating substances in direct proportion to their concentrations in the plasma, but nonspecific in that it will remove multiple substances, both proinflammatory and anti-inflammatory [ 1, 2].
To be an effective complement to existing monitoring efforts, it is essential that the methods be tested in multiple languages and across multiple substances as well as new, possibly yet unknown, substances.
In addition, most environmental exposures involve multiple substances, and attributing cause to a single chemical can often be difficult.
