Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Depression predicts heart rhythm abnormalities in heart attack patients

07.03.2005


Duke University Medical Center investigators have found a strong association between depression and the incidence of irregular and rapid beating of the heart’s main pumping chambers in patients who have been hospitalized for a heart attack. This finding is important, the researchers said, because this heart beat irregularity, known as ventricular tachycardia, can be a precursor of sudden cardiac death .

Interestingly, the researchers found this association between depression and ventricular tachycardia in patients who were relatively healthy and that the risk of ventricular tachycardia increased with increased levels of depression. The researchers also found a link between anxiety and ventricular tachycardia.

Based on the results of their study, the researchers believe that hospitalized heart attack patients should be evaluated for depression, and those who are found to be clinically depressed should have their heart activity closely monitored.



Ventricular tachycardia, which can be treated with such drugs as beta blockers, occurs whenever ventricles beat more than 100 times in a minute. In some cases, the tachycardia may only last for a few beats; however sustained periods of tachycardia can cause ventricular damage needing immediate attention.

Duke research assistant Patrick Smith presented the results of the Duke analysis March 5, 2005, at the annual meeting of the American Psychosomatic Society in Vancouver. The research was supported by the National Heart, Lung, and Blood Institute.

"The results of our analysis showed that depression in patients who have been hospitalized for a heart attack can be a significant predictor of ventricular tachycardia," Smith said. "Also, the finding that scores from commonly used tests of depression and anxiety were associated with the frequency of ventricular tachycardia suggests that depression, anxiety and these potentially life-threatening dysrhythmias are connected."

For the study, the team followed 72 patients admitted to Duke University Hospital with a heart attack. Patients were interviewed by a mental health provider and given standardized tests for depression and anxiety within three days of admission. All patients were then connected to a heart monitor that recorded detailed heart beat information continuously over a 24-hour period.

"We found that almost one in five (18 percent) patients met the criteria for clinical depression," Smith said. "Of those patients deemed to be clinically depressed, 38 percent had at least one episode of ventricular tachycardia, compared to only 10 percent for the non-depressed patients. We also found a strong correlation between the severity of the depression and the number of beats of ventricular tachycardia."

Specifically, the researchers found that based on scores from the commonly used Beck Depression Inventory (BDI), going from a non-depressed state to mild depression conferred an 81 percent higher risk of suffering from ventricular tachycardia.

"We were surprised that we saw such a strong association between depression and ventricular tachycardia in these patients, who were among the ’healthiest’ of heart attack patients," said senior researcher Lana Watkins, Ph.D. "We excluded patients whose left ventricle – the main pumping chamber -- was pumping at less than 30 percent of its capacity.

"Given that we saw such a strong association in a relatively healthy population of heart attack patients suggest that depression can be a useful clinical predictor of ventricular tachycardia," she said.

While the researchers cannot determine whether there is a cause-and-effect relationship between depression and ventricular tachycardia, it is known that depression has been linked to activation of the immune system, as well as alteration of the aggregation properties of blood platelets. Depression has also been linked to other such cardiovascular risk factors as insulin resistance, hypertension, obesity, increased cigarette smoking, alcohol abuse and physical inactivity.

The current study is an analysis of a subgroup of patients enrolled in an ongoing investigation led by Watkins that could provide insights into the effects of depression and stress on heart rate variability. Patients whose hearts are unable to appropriately regulate their beating action in response to outside stimuli – such as stress and anxiety – are known to be at higher risk of suffering a heart attack, the researchers said. The researchers hope correlate the clinical data obtained from portable heart monitors worn 24 hours a day with everyday stressors as recorded in a diary.

"I think primary care physicians, as well as cardiologists, are beginning to appreciate the role of psychosocial factors in the coronary artery disease," said Watkins. "What is needed is more of an understanding of the pathophysiology of this association between depression and coronary artery disease. With that information, we can then determine whether or not treating the depression in this group of patients can actually improve mortality."

She said that depressed heart attack patients should have their heart rhythm monitored closely, since medical approaches to treating depression can often take weeks to be effective.

Other Duke colleagues on the study included James Blumenthal, Ph.D., Michael Babyak, Ph.D., Anastasia Georgiades, Ph.D., Andrew Sherwood, Ph.D., Amy Keeler, and Michael Sketch, M.D., and Ranga Krishnan, M.D.

Richard Merritt | EurekAlert!
Further information:
http://www.duke.edu

More articles from Health and Medicine:

nachricht Investigators may unlock mystery of how staph cells dodge the body's immune system
22.09.2017 | Cedars-Sinai Medical Center

nachricht Monitoring the heart's mitochondria to predict cardiac arrest?
21.09.2017 | Boston Children's Hospital

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: The pyrenoid is a carbon-fixing liquid droplet

Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.

A warming planet

Im Focus: Highly precise wiring in the Cerebral Cortex

Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.

The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...

Im Focus: Tiny lasers from a gallery of whispers

New technique promises tunable laser devices

Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...

Im Focus: Ultrafast snapshots of relaxing electrons in solids

Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!

When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...

Im Focus: Quantum Sensors Decipher Magnetic Ordering in a New Semiconducting Material

For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.

Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

“Lasers in Composites Symposium” in Aachen – from Science to Application

19.09.2017 | Event News

I-ESA 2018 – Call for Papers

12.09.2017 | Event News

EMBO at Basel Life, a new conference on current and emerging life science research

06.09.2017 | Event News

 
Latest News

Penn first in world to treat patient with new radiation technology

22.09.2017 | Medical Engineering

Calculating quietness

22.09.2017 | Physics and Astronomy

Hope to discover sure signs of life on Mars? New research says look for the element vanadium

22.09.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>