reuters.com — A growing number of U.S. adults are struggling to pay their medical bills, tapping into savings accounts, home equity and credit cards to cover health care costs, according to a survey released on Wednesday. An estimated 72 million Americans aged 19 to 64, or 41 percent, said they had trouble paying for medical care in 2007, with some slipping far enough behind to face collection agencies. That compared to nearly 58 million, or 34 percent, in 2005, the Commonwealth Fund survey found. The report comes as U.S. consumers face rising financial pressures, including higher energy costs, food bills and mortgage payments.