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Here is the original case report, as published in Environmental Health Perspectives: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3279446/pdf/ehp.1103877.pdf

In case you are not familiar with how medical literature is written, the pertinent facts are these:
1) The proposed study and consent forms were reviewed and okayed by an ethics committee before any patients were tested. The study was explained to the patient and she had an opportunity to read the consent form before signing it.
2) The patient had a number of pre-existing conditions, including high blood pressure. Her father died at 57 from heart disease.
3) The patient herself was unaware of the medical problem when it occurred. It was detected because she was attached to a number of monitors. It fully resolved within two hours.
4) It is not clear that the incident occurred because of the study. The timing of the incident suggests a causal relationship, but is not definitive proof.
5) There is clearly no attempt to cover up anything. Obviously, had the study leads wanted to hide anything, they wouldn’t have published a case study on the incident.

There is nothing unusual about adverse events occurring during human medical studies, and, as adverse events go, this one was pretty mild.