A biomedical engineer at Purdue University, West Lafayette, Ind., biomedical engineer has developed a new method to perform cardiopulmonary resuscitation that promises to be more effective than standard CPR because it increases nourishing blood flow through the heart by 25 percent over the current method.

A new technique is desperately needed because conventional CPR has a success rate of 5 percent to 10 percent, depending on how fast rescuers are able to respond and how well the procedure is performed. For every one minute of delay, the resuscitation rate decreases by 10 percent.

“In other words, at 10 minutes, the resuscitation is absolutely ineffective,” says Leslie Geddes, PhD, DSc, Showalter Distinguished Professor Emeritus in Purdue’s Weldon School of Biomedical Engineering. “Any medical procedure that had that low a success rate would be abandoned right away. But, the alternative is not very good, either: Don’t do CPR and the person is going to die.”

Geddes has developed the first new CPR alternative, called “only rhythmic abdominal compression,” or OAC-CPR, which works by pushing on the abdomen instead of the chest.

“There are major problems with standard CPR,” Geddes says. “One is the risk of breaking ribs if you push too hard, but if you don’t push hard you won’t save the person. Another problem is the risk of transferring infection with mouth-to-mouth breathing.”

The new CPR method eliminates both risks, Geddes says.

Findings were detailed recently in a research paper appearing this month in the American Journal of Emergency Medicine.

In standard chest-compression CPR, which has been in practice since the 1960s, the rescuer pushes on the chest and blows into the subject’s mouth twice for every 30 chest compressions. However, the risk of infection is so grave that many doctors and nurses often refuse to administer mouth-to-mouth resuscitation.

In one 1993 study of 433 doctors and 152 nurses, 45 percent of doctors and 80 percent of nurses said they would refuse to administer mouth-to-mouth resuscitation on a stranger.

“This is the real world that nobody knows about, and it’s a sobering thought,” Geddes says.

OAC-CPR eliminates the need to perform mouth-to-mouth resuscitation.

The American Heart Association requires that rescuers administering CPR push with enough force to depress the chest one-and-a-half to 2 inches at a rate of 100 times per minute.

“To depress the chest one-and-a-half to 2 inches takes 100 to 125 pounds of force,” Geddes says. “So you have to push pretty hard and pretty fast, and two people are needed to perform it properly. One blows up the lungs and the other compresses the chest. And when the one who’s compressing the chest gets tired, they change positions.”

OAC-CPR requires only one rescuer. Instead of two breaths for every 30 chest compressions, the new procedure provides a breath for every abdominal compression because pushing on the abdomen depresses the diaphragm toward the head, expelling air from the lungs. The release of force causes inhalation. (home page photo courtesy of Purdue News Service photo/ David Umberger)

Source: Purdue University