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TherOx Begins IDE Study of Next-Generation Supersaturated Oxygen Therapy for AMI

Wed, 02/06/2013 - 8:00am
The Associated Press

IRVINE, Calif.--(BUSINESS WIRE)--Feb 6, 2013--TherOx, Inc., a privately held medical device company focused on the treatment of Acute Myocardial Infarction (AMI), today announced the initiation of its multicenter Investigational Device Exemption (IDE) pilot study of a second generation system that delivers Supersaturated Oxygen (SSO 2 ) Therapy for reduction of infarct size after an AMI. SSO 2 Therapy is intended to provide interventional cardiologists with the first treatment option beyond percutaneous coronary intervention (PCI) to salvage heart muscle in heart attack patients.

The first patient was treated by Amr Abbas, MD, Director of Interventional Cardiology Research at Beaumont Hospital in Royal Oak, MI. Simon Dixon, MD, chair of cardiovascular medicine at Beaumont Hospital and an investigator for this study, was involved in the previous SSO 2 Therapy trial, AMIHOT II. He noted, “During AMIHOT II, we found the infarct size reduction achieved by SSO 2 Therapy was clinically significant. Because of this, I believe SSO 2 therapy shows great potential in improving outcomes for high-risk patients.” According to the American Heart Association, every year approximately one million people in the U.S. have heart attacks. Although PCI is the standard of care in treating AMI, for many patients it doesn’t do enough to reduce infarct size and achieve maximum clinical benefit. SSO 2 Therapy, adjunctive to PCI, is a solution of highly oxygenated saline mixed with the patient’s blood delivered through a catheter to the targeted ischemic area of the heart. SSO 2 Therapy is intended to salvage the jeopardized myocardium and thus reduce infarct size.

“Randomized clinical studies show that final infarct size correlates with improved cardiac function as well as mortality in heart attack patients. Further reducing infarct size in heart attack patients is an unmet clinical need which SSO 2 Therapy may help address,” said Gregg W. Stone, MD, principal investigator of the SSO 2 Therapy IDE trial and professor of medicine at Columbia University Medical Center.

“This IDE study is an important milestone toward bringing SSO 2 Therapy to the U.S. market,” said Kevin T. Larkin, president and chief executive officer of TherOx. “This second generation system improves upon our previous system by making SSO 2 Therapy easier to administer in the cath lab, and we anticipate even better results than achieved in AMIHOT II.” The pilot phase of the IDE study will enroll 20 patients in the U.S. In addition to Beaumont Health System, the other principal investigators and centers involved in the study are: Shukri David, MD, at Providence Hospital Cardiology in Detroit Chris Metzger, MD, at Wellmont CVA Heart Institute at Holston Valley Medical Center in Kingsport, TN David Rizik, MD, at Scottsdale Heart Group in Scottsdale, AZ About SSO 2 Therapy A heart attack is typically caused when blood and oxygen flow to the heart is blocked or reduced. If not quickly restored, irreversible damage to the heart muscle, or infarction, will occur. SSO 2 Therapy is designed to reduce infarct size by boosting oxygen delivery to the heart muscle immediately after the coronary artery has been opened by PCI. The TherOx system creates SSO 2 Therapy by mixing highly oxygenated saline with the patient’s blood and delivers it through a catheter directly to the targeted ischemic area of the heart.

The first generation system to deliver SSO 2 Therapy received the CE Mark and was successful in meeting the safety and effectiveness endpoints in the AMIHOT II trial. Statistical results from the AMIHOT II trial of SSO 2 Therapy, together with PCI and stenting, demonstrated a relative reduction of 26% in infarct size compared to PCI and stenting alone. In addition, the finding of device effectiveness was supported by additional analyses that showed a 53% increased likelihood of having a small (less than 5% damage of the left ventricle) infarct among SSO 2 Therapy patients. The results were published in . 1 This second generation system being studied builds on the success of AMIHOT II and includes the additional benefits of shortening the treatment time to 60 minutes and broadening the treatment area to the entire left coronary system so that no ischemic area goes untreated. SSO 2 Therapy is consistent with the 90-minute “door to balloon” initiative and supports the current guidelines for interventional cardiology procedures.

About TherOx, Inc. TherOx is a privately held medical device company based in Irvine, Calif., focused on developing and commercializing SSO 2 Therapy for this sizeable patient population to save hearts, and ultimately save lives. The major investors in TherOx include Kleiner Perkins Caufield & Byers, New Science Ventures, Integral Capital Partners, Aperture Venture Partners, DAG Ventures, and Cross Creek Capital. For more information about TherOx, visit http://www.therox.com.

In the United States, SSO 2 Therapy is delivered by an investigational device. It is limited by United States law to investigational use. It is not for sale or distribution in the United States.

1 Stone GW, Martin JL, Boer MJ, et al. Effect of Supersaturated Oxygen Delivery on Infarct Size After Percutaneous Coronary Intervention in Acute Myocardial Infarction. Cir Cardiovasc Interv 2009;2:366-75.

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