The CDC has an interesting report out in their Morbidity and Mortality Weekly Report (MMWR).
This bit overviews a report from the Los Angeles County Department of Public Health which sought information on Emergency Department visits and other fatalities involving people who attended a New Year's event Dec 31, 2009-Jan 1, 2010. The investigation determined that
18 patients visited EDs in LAC for MDMA-related illness within 12 hours of the rave. All were aged 16--34 years, and nine were female. In addition to using MDMA, 10 of the 18 had used alcohol, and five had used other drugs. Three patients were admitted to the hospital, including one to intensive care. A tablet obtained from one of the patients contained MDMA and caffeine, without known toxic contaminants.
One of the rather unique and interesting features is that the report presents a timeline of when the rave attendees showed up in the local emergency departments.
FIGURE. Number, drug use, and arrival times of rave attendees transported to emergency departments (N = 30)* --- Los Angeles County, California, December 31, 2009--January 1, 2010 § Patient consumed additional ecstasy after the rave.[source]
Otherwise this is pretty run-of-the-mill stuff. Usually such emergency events are relatively rare but given there were an estimated 45,000 attendees at the event (an unknown number consuming Ecstasy of course), getting 30 cases sounds about right. And the clinical profile is familiar as well:
Clinical findings among the 18 patients with MDMA exposure were consistent with MDMA use (1,4), including agitation, hypertension, mydriasis, and tachycardia (Table). Fifteen of the patients were treated and released. Three were admitted. Two were treated for 2 and 4 days, respectively, and discharged in good condition. One patient was admitted to the ICU with seizure, rhabdomyolysis, renal failure requiring hemodialysis, and hepatic failure; he was discharged to home outpatient hemodialysis after a 28-day hospital stay.
Additional reading from me on MDMA:
Street Ecstasy content
MDMA-associated deaths and fatalities in Australia
It really was the MDMA that killed him
Translating doses between humans and the laboratory animal models
Parsing news reports on MDMA-related fatality