Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Availability of vascular surgeons impacts amputation rate

11.07.2005


Rice University/Baylor College of Medicine study focuses on peripheral arterial disease



Patients with peripheral arterial disease (PAD) are more likely to have a foot or leg amputated if they live in a region that has few vascular surgeons, according to a Rice University/Baylor College of Medicine study published in the July issue of the Journal of Vascular Surgery.

"We found that areas of the country that had higher numbers of vascular surgeons had more bypass surgery performed and lower amputation rates," said principal investigator Vivian Ho, a health economist at Rice’s Baker Institute for Public Policy and an associate professor of medicine at Baylor.


PAD is a condition in which fatty deposits build up on the inner linings of arteries, restricting the flow of blood to muscles and organs, especially the kidneys, stomach, arms, legs and feet. About 8 million to 12 million people are affected by PAD. The disease accounts for about half of all amputations among diabetics and is the major cause of amputation for nondiabetic patients.

Treatment often entails lifestyle changes and medication. Sometimes amputations can be avoided through bypass surgery in the lower extremities that improves blood circulation in the legs and feet; this procedure must be performed by vascular surgeons.

Amputation rates can vary as much as tenfold in different areas of the U.S., so Ho wanted to analyze whether the availability of vascular surgeons in a region affects revascularization and amputation rates for patients with PAD. Collaborating with the University of Alabama in Birmingham and Intermountain Health Care in Salt Lake City, Utah, Ho identified all patients with PAD in the Medicare claims data in 1994 and tracked their claims through 1999. She separated data on more than 143,200 patients who survived through 1999 by hospital referral region and merged it with information on the supply of local physicians and vascular surgeons.

Ho’s statistical analysis of the data revealed that a .30 increase in the number of vascular surgeons per 10,000 Medicare beneficiaries resulted in almost a 1 percent increase in bypass surgery rates and a 1.6 percent reduction in amputation rates.

The study suggests that the likelihood a patient with PAD undergoes revascularization might depend on access to vascular specialists. But Ho found a "substantial disparity" in the supply of vascular surgeons across the country. Although this disparity might be expected, due to differences in the incidence of PAD in various regions of the nation, Ho found that even after allowing for the varying rates of the disease by location, the supply of vascular surgeons was strongly related to the attractiveness of an area. The nation’s 1,500 vascular surgeons treating Medicare patients are more likely to live in locations with high rankings in "Places Rated Almanac," which compares cities in terms of recreation, education, transportation, arts, cost of living, climate, crime rate, health care, jobs and other marketing criteria. "Regional variability in specialists who treat PAD is influenced by factors other than regional medical needs," said Ho, who is also an associate professor of economics at Rice.

She noted, for example, that Houston ranks No. 8 in the "Places Rated Almanac" and has 50 percent more vascular surgeons per capita than Corpus Christi, Texas, which ranks No. 179. In turn, the amputation rate among Medicare beneficiaries in Houston is only half that found in Corpus Christi (2 versus 4.35 per 10,000 Medicare beneficiaries).

Ho also studied the availability of interventional radiologists, who can perform angioplasty in the lower extremities of patients with PAD to improve circulation. "We found weaker evidence that greater availability of interventional radiologists increases angioplasty rates and reduces amputation rates," Ho said.

"What surprised me most about the study is the disparity in the supply of specialists and the fact that so much of the variation in the supply is determined by where the specialists want to live rather than where they are needed most," she said.

To reduce the regional disparities in amputation, policies should be aimed at redistributing the supply of vascular surgeons and interventional radiologists to underserved areas, Ho said. Increasing Medicare reimbursement rates in rural areas that tend to be less attractive for living, offering loan-forgiveness programs to medical school graduates who agree to practice in regions with a low supply of specialists and subsidizing teaching hospitals in low-supply areas are among the policy options that might resolve the disparity.

Ho’s research was supported by a grant from the Agency for Health Care Research and Quality. Her co-authors were Douglas Wirthlin at Intermountain Health Care; Huifeng Yun in the Department of Health Care Organization and Policy at the University of Alabama, Birmingham; and Jeroan Allison in the divisions of General Internal Medicine and Preventive Medicine at the University of Alabama, Birmingham.

B.J. Almond | EurekAlert!
Further information:
http://www.rice.edu

More articles from Health and Medicine:

nachricht Nanoparticles as a Solution against Antibiotic Resistance?
15.12.2017 | Friedrich-Schiller-Universität Jena

nachricht Plasmonic biosensors enable development of new easy-to-use health tests
14.12.2017 | Aalto University

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: First-of-its-kind chemical oscillator offers new level of molecular control

DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.

Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...

Im Focus: Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...

Im Focus: Electromagnetic water cloak eliminates drag and wake

Detailed calculations show water cloaks are feasible with today's technology

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...

Im Focus: Scientists channel graphene to understand filtration and ion transport into cells

Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.

To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...

Im Focus: Towards data storage at the single molecule level

The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.

Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

 
Latest News

Engineers program tiny robots to move, think like insects

15.12.2017 | Power and Electrical Engineering

One in 5 materials chemistry papers may be wrong, study suggests

15.12.2017 | Materials Sciences

New antbird species discovered in Peru by LSU ornithologists

15.12.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>