Doctors in the Netherlands injected bone marrow and stem cells into the heart of 50 patients, all suffering from a chronic heart condition. Some got a placebo instead of the stem cells.

Three months after the procedure, those who got the real treatment had improvements in blood flow and heart function, exercise capacity and overall quality of life.

A Minnesota company is warning doctors about thousands of defective pacemakers that may have played a role in two patient deaths.

Minneapolis-based Medtronic sent a letter warning doctors 37,000 of its pacemakers may have wiring defects that can cause a malfunction.

The company says the problem affects its Kappa and Sigma pacemakers, causing them to not respond or run out of battery power.

Company officials say they've gotten two reports of patient deaths where the pacemaker may have played a role.

A drug company is waiting for approval to produce a swine flu vaccine.

Swiss drug maker Novartis is asking the World Health Organization and U.S. Centers for Disease Control to begin producing the cure. The company has samples of the virus and is waiting to begin processing the drug.