Monday February 19, 2018

Potential generic drugs used for heart-disease may treat Ebola

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New York: Generic drugs used to treat heart diseases also have the potential to bolster the immune systems of patients with Ebola virus and some other life-threatening illnesses, research has found.

Unlike other medications in development for Ebola, which attack the virus, statins and angiotensin receptor blockers, typically used for heart disease, work on the host response, or a person’s biological reaction to the virus, said a lead study, authored by  David Fedson, retired professor of Medicine at the University of Virginia in the US.

“The statin or angiotensin receptor blocker combination was found to help improve survival in 100 Ebola patients treated in Sierra Leone”, Fedson said. “This approach to Ebola treatment has two advantages,” he added.

According to him, the first advantage is that it uses inexpensive generic drugs that are widely available in any country with a basic healthcare system, and most physicians who treat patients with cardiovascular diseases are familiar with these medications.  Second, because this strategy targets the host response to infection, these drugs might be used to treat patients with any form of acute infectious disease in which a failure to overcome endothelial dysfunction could lead to multi-organ failure and death, Fedson noted.

In a pilot study, patients were given the drugs atorvastatin (40 mg/day) and irbesartan (150 mg/day) at several hospitals in West Africa.

The researchers found rapid clinical improvement in most patients.

Specifically, the drugs stabilise or restore the integrity of endothelial cells lining the blood vessels.

Endothelial cell dysfunction has been a central feature of human Ebola virus disease, leading to severe fluid and mineral losses, Fedson explained.

The findings appeared in ‘mBio’, the online open-access journal of the American Society for Microbiology.

(IANS)

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Tiny Pacemakers Could Be Game Changers for Heart Patients

A pacemaker is a medical device which uses electrical impulses, delivered by electrodes contracting the heart muscles, to regulate the beating of the heart

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The tiny pacemakers are not right for all patients, but as the technology develops, more people will be able to benefit from the procedure.
The tiny pacemakers are not right for all patients, but as the technology develops, more people will be able to benefit from the procedure. Wikimedia Commons

Tiny, new pacemakers are making headway around the world. One type, the Micra, is keeping 15,000 people’s hearts beating in 40 countries, according to manufacturer Medtronic. One of those people is Mary Lou Trejo, a senior citizen who lives in Ohio.

A healthy heart has its own pacemaker that establishes its rhythm, but people like Trejo need the help of an artificial device.

Trejo comes from a family with a history of heart disease. Her heart skipped beats, and she could feel it going out of rhythm. Trejo wanted to do something to advance heart health, so in 2014, she volunteered to participate in a clinical trial for the Micra pacemaker. The device is 24 millimetres long implanted, one-tenth the size of traditional pacemakers.

Traditional pacemakers

Most pacemakers rely on batteries placed under the skin, usually just below the collarbone. Sometimes patients get infections after the surgery or have difficulty healing from the incision.

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Traditional pacemakers use leads with electrodes on one end that are threaded through blood vessels to connect to the heart. There can be problems with the leads as well.

A healthy heart has its own pacemaker that establishes its rhythm, but people like Trejo need the help of an artificial device.
A healthy heart has its own pacemaker that establishes its rhythm, but people like Trejo need the help of an artificial device. Wikimedia Commons

Dr Ralph Augostini at Ohio State’s Wexner Medical Center says a tiny pacemaker like the Micra avoids all of these problems.

“The electrodes are part of the can, and therefore it eliminates the lead,” he said. There’s no incision in the chest to become infected and no chance of complications with the leads.

Small and self-contained

Augostini implanted Trejo’s pacemaker in 2014. He threaded the entire device through an artery in her leg up to her heart. The pacemaker has small, flexible tines that anchor it into the folds of the heart muscle. Once it’s in place, the doctor gives it a tug to make sure the pacemaker is stable before removing the catheter used to place it in the heart.

The Wexner Medical Center was one of the sites that participated in the Micra clinical trial. Since the Micra received FDA approval in 2016, Medtronic has been training more physicians on the procedure. A company spokesman told VOA that this device is becoming available at other centres across the U.S. and countries throughout the world.

Traditional pacemakers use leads with electrodes on one end that are threaded through blood vessels to connect to the heart.
Traditional pacemakers use leads with electrodes on one end that are threaded through blood vessels to connect to the heart. Wikimedia Commons

Dr John Hummell, a cardiologist at the Wexner Medical Center, has studied the effectiveness of this new generation of pacemakers.

“We don’t leave any wires behind and the pacemaker, the battery, the wire is all just a tiny little piece of metal sitting down in the heart,” he said. Medtronic said the results of the clinical trial showed a success rate of 99.6 percent.

Dr Richard Weachter, with the University of Missouri Health Care, says the leadless pacemakers’ complication rates are about half the rate of traditional pacemakers.

The battery lasts for 14 years and after that, Weachter said, doctors, can implant another one in the same chamber of the heart. They can repeat the procedure a third time if needed.

Also Read: Novel stroke treatment repairs damaged brain tissue

The pacemaker activates only when necessary to keep the heart beating normally. Studies show that the Micra and other leadless pacemakers are safe and effective.

These tiny pacemakers are not right for all patients, but as the technology develops, more people will be able to benefit from the procedure. Four years after her implant, Trejo’s doctors say she is doing fine. (VOA)