There are some that would argue that hospitals are no place for dogs, while they are wrong

. At least according to new research reported at the American Heart Association's Scientific Sessions 2005. For people hospitalized with advanced heart disease, it is better to have visitors than to lie quietly alone. But one type of visitor seems to be especially beneficial, researchers reported on Tuesday. That visitor is a dog. In the first controlled study of the effects of pet therapy in a random sample of acute and critically ill heart patients, anxiety as measured on a standard rating scale dropped 24 percent for those visited by a dog and a human volunteer, by 10 percent for those visited by a volunteer alone and not at all for those with no visitors. Similar results were found in measures of heart and lung function.

The senior author of the Pet Therapy Study, Kathie M. Cole, said 76 patients with heart failure, a condition that affects an estimated five million Americans, were randomly assigned one of the three visit types. The dogs, from 12 breeds, were screened for behavior. and disease before participating in the study. "Some patients in the first group," Ms. Cole said, "began to smile and immediately engaged in conversation with dog and volunteer." "Their worries seemed to vanish from their faces," she said. The researchers examined the patients three times: right before the 12-minute visit, eight minutes into it and four minutes after it was over.

Besides the anxiety measurement, researchers found, patients' levels of epinephrine, a hormone the body makes when under stress, dropped 17 percent when visited by a person and a dog, and 2 percent when visited by only a person. Epinephrine levels rose an average of 7 percent in the unvisited group in the study, which was financed by the Pet Care Trust Foundation, a nonprofit group. Pressure in the heart's top left chamber dropped 10 percent after a visit by volunteer and dog. The same pressure rose 3 percent for those visited by a volunteer and 5 percent for the unvisited group. Pressure in the pulmonary artery dropped 5 percent during and after a visit by volunteer and dog, but rose in the other two groups. Ms. Cole recommended further studies to determine how long the benefits lasted. "Dogs are a great comfort," she said. "They make people happier, calmer and feel more loved. That is huge when you are scared and not feeling well."

The sentence "Similar results were found…" (Last sentence, Para. 1) means______.

A．the measurement of patient's heart and lung function drops when without visitor

B．human volunteers only can't provide help for the patient's heart and lung function

C．patient's heart and lung work more effectively when visited by dog and volunteer

D．none of the above