Blog Archive
-
▼
2010
(17)
-
▼
December
(11)
- FDA scrutinizes weight loss pill from Orexigen
- Caricom to launch ID cards for regional travel
- RV industry rebounding, led by smaller trailers
- Judge re-sentences convicted Ohio health exec
- US drilling decisions ripple on Gulf Coast
- Qatar must win over skeptical WCup fans
- Agency moves to end Philly cruise ship departures
- Panel recommends expanding use of stomach bands
- Spain gets tough to end strike at airports
- Russian jet crash-lands after engines fail; 2 dead
- Doctors testing warm, beating hearts in transplant
-
▼
December
(11)
Followers
diggit();LinkToThis()Andrea Ybarra's donated heart was beating rhythmically by the time she awoke from the grogginess grog·gy
adj. grog·gi·er, grog·gi·est
Unsteady and dazed; shaky.
[From grog.]
grog of her surgery.
Lub-dub. Lub-dub. Lub-dub. In fact, it was warm and pumping even before doctors transplanted it.
Ybarra belongs to a small group of people who have had a "beating heart" transplant, an experimental operation that's mostly been done in Europe. The donor heart is placed into a special box that feeds it blood and keeps it warm and ticking outside the body.
"I felt peaceful when I woke up. I wasn't scared," recalled the 40-year-old from Los Angeles who suffers from lupus. "It felt like the heart was a part of me all the time."
Despite advances in heart transplantation Heart Transplantation Definition
Heart transplantation, also called cardiac transplantation, is the replacement of a patient's diseased or injured heart with a healthy donor heart. , the way hearts are moved around the United States and most places remains low-tech.
A team of doctors and organ recovery specialists stuffs an off-the-shelf picnic cooler with ice and jets off at odd hours to a donor hospital where a heart from a brain-dead patient awaits. They inject a chemical to stop the organ and preserve it in the ice chest for the trip home.
Once a heart is harvested, it's a race against time. A heart can stay fresh in the cooler for 4 to 6 hours before it starts to deteriorate. Because of this constraint, doctors can't travel too far to heart-hunt.
It's been done this way for more than four decades, ever since the first U.S. heart transplant was performed on Dec. 6, 1967.
Research has shown that the longer it takes to remove a heart and transplant it, the greater the patient's chance of death or heart disease.
But what if a heart could beat on its own after removal from a cadaver cadaver /ca·dav·er/ (kah-dav´er) a dead body; generally applied to a human body preserved for anatomical study.cadav´ericcadav´erous
ca·dav·er
n. ?
It may sound a bit macabre, more like an Edgar Allan Poe story. The new high-tech heart box circulates blood from the donor to the heart so that it continues throbbing throb
intr.v. throbbed, throb·bing, throbs
1. To beat rapidly or violently, as the heart; pound.
2. To vibrate, pulsate, or sound with a steady pronounced rhythm: while in transit from hospital to hospital.
Based on some success overseas, the University of California, Los Angeles UCLA comprises the College of Letters and Science (the primary undergraduate college), seven professional schools, and five professional Health Science schools. Since 2001, UCLA has enrolled over 33,000 total students, and that number is steadily rising. is currently heading an experiment along with several other schools that compares the safety and effectiveness of the new preservation method versus the standard cooler.
If the new technology succeeds in preserving hearts longer, it could change the field, experts say.
No longer will patients be limited by location. Doctors could make cross-country heart runs without worrying about how long it takes. Hearts are now given first to people on the waiting list who live near where the donor is hospitalized. If there's no match, then the circle widens until a recipient is found.
"The rush factor will be taken out. I can go all the way to the West Coast to get a heart," said Dr. Bruce Rosengard of Massachusetts General Hospital, who performed the first beating heart transplant in the United Kingdom in 2006.
It may also potentially help ease the organ shortage organ shortage Transplantation The gap between the number of organs transplanted and number needed. See UNOS. Cf Organ brokerage. crisis. Some 3,000 Americans are currently on the heart transplant waiting list. Last year, 359 died waiting for a heart — almost one person a day.
The thinking is that hearts may be in better condition if they're kept beating instead of being cooled in ice. And if hearts can be monitored outside the body, proponents say this may help increase the organ pool by allowing less-than-perfect hearts to be transplanted.
Ybarra's surgery began like any other. The call came in to Ronald Reagan UCLA Medical Center UCLA Medical Center is a hospital located on the campus of the University of California, Los Angeles in Los Angeles, California. It is rated as one of the top three hospitals in the United States and is the top hospital on the West Coast according to US News & World Report. shortly before 4 p.m. on Aug. 24. There is a heart available. Do you have a match?
The transplant team dialed Ybarra. Her lupus, an immune system immune system
Cells, cell products, organs, and structures of the body involved in the detection and destruction of foreign invaders, such as bacteria, viruses, and cancer cells. Immunity is based on the system's ability to launch a defense against such invaders. disease in which the body attacks its own organs, had ravaged her heart, leaving it enlarged and weak. She desperately needed a transplant.
The following day, a brigade of doctors and technicians set off before dawn by limo to the Van Nuys Airport Van Nuys Airport (IATA: VNY, ICAO: KVNY, FAA LID: VNY) is a public airport located in Van Nuys, California in the San Fernando Valley, within the Los Angeles city limits. to board a private jet to the donor hospital in the Palm Springs area east of Los Angeles.
Since Ybarra signed up to be part of the beating heart experiment, she had a 50-50 chance of having the new operation.
Before the team left, a nurse practitioner drew a card at random: Ybarra was getting the experimental heart transplant.
The doctors arrived at the donor hospital at 6:20 a.m. and cut open the patient's chest an hour later. After examining the heart, they stopped it to remove it. Instead of packing the heart on ice, doctors transferred it to a box filled with blood and nutrients to revive it. The box was then tucked inside a portable machine for transport.
On the way back to UCLA UCLA University of California at Los Angeles
UCLA University Center for Learning Assistance (Illinois State University)
UCLA University of Carrollton, TX and Lower Addison, TX , the heart was closely checked to make sure it was stable.
In the meantime Adv. 1. in the meantime - during the intervening time; "meanwhile I will not think about the problem"; "meantime he was attentive to his other interests"; "in the meantime the police were notified"
meantime, meanwhile , Ybarra was wheeled into the operating room and put under. She was placed on a heart-lung machine as doctors took out her failing heart. The new one was ticking nearby. Surgeons re-stopped the donor heart and sewed it into Ybarra. As her own blood coursed through, it began to pound.
All told, the donated heart had been beating in the box for a little over three hours.
If a heart can survive outside the body longer than the current limit, heart transplants may someday be less an emergency procedure and more like an appointment that can be scheduled — a convenience for both patients and doctors.
"If you knew an organ could be preserved, instead of doing a transplant at 3 a.m., you can push it back to 6 a.m.," said UCLA's Dr. Richard Shemin, who performed Ybarra's operation on his 39th wedding anniversary.
The world's first beating heart transplant was performed in Germany in 2006, using an organ box invented by TransMedics Inc., a private medical device company in Andover, Mass., as part of a multi-center study in Europe.
The company followed up with a pilot study in the U.S. It is currently funding the UCLA-led experiment, which will enroll 128 patients nationwide, randomly chosen to get a beating heart transplant or the traditional kind.
About 100 patients, mostly in Europe, have had a beating heart transplant, according to TransMedics.
Early signs from two European experiments involving 54 patients are encouraging. There has been 97 percent survival a month after the operation and few episodes of rejection and heart-related complications. But since there were no comparison groups in either study, it's impossible to know whether a beating heart transplant is actually better.
The current U.S. study is the first to test the methods head-to-head.
Doctors admit some patients are spooked by the idea of a heart beating on its own before the transplant.
"It's very difficult to remedy their anxiety. But when you think about it, the human heart was never meant to be in a cooler on ice," said lead investigator Dr. Abbas Ardehali of UCLA. TransMedics paid his travel expenses to a medical meeting, but he does not have other financial ties to the company.
Transplant doctors with no connection to the research note that the current system works despite the antiquated way hearts are carted around. Before beating heart transplants can be routine, researchers must not only prove that the technology can preserve hearts better and longer, but that recipients also have improved survival and health than if they had a regular heart transplant.
"In theory, it's a fabulous idea," said Dr. Stuart Russell, heart transplant chief at Johns Hopkins University Johns Hopkins University, mainly at Baltimore, Md. Johns Hopkins in 1867 had a group of his associates incorporated as the trustees of a university and a hospital, endowing each with $3.5 million. Daniel C. . But more data is needed to determine whether "it will or won't fly."
There's also the issue of cost. A typical heart transplant in the U.S. costs about $787,000 including hospital stay and anti-rejection drugs. An Igloo igloo (ig`l
) [Inuit,=house]. The Eskimos traditionally had three types of houses. cooler costs $35 compared with the heart box, which is sold in Europe for about $200,000. The interior is not reusable so there's an added expense each time a hospital does such an operation.
Like other transplant recipients, Ybarra was monitored closely after her August surgery to make sure her body wasn't rejecting the foreign organ. Her health slowly improved. She could walk around the block without getting tired — a small victory for someone who couldn't even take a few steps before.
During a recent checkup in October, Ybarra laid on a table as a doctor snaked a thin tube into her jugular vein and removed small pieces of her heart for a biopsy. She then walked over to her cardiologist's office where she got the scabs on her chest checked out.
Her last stop was getting an echocardiogram ech·o·car·di·o·gram
n.
A visual record produced by echocardiography.
A non-invasive ultrasound test that shows an image of the inside of the heart. , a sonogram son·o·gram
n.
An image, as of an unborn fetus, produced by ultrasonography. Also called echogram, sonograph, ultrasonogram. of the heart.
It looked normal. Copyright 2010 AP Features
No portion of this article can be reproduced without the express written permission from the copyright holder. SocialNetworks()
0 comments:
Post a Comment