One in three people who survived stays in an intensive care unit (ICU) and required use of a mechanical ventilator showed substantial post-traumatic stress disorder (PTSD) symptoms that lasted for up to two years, according to a new Johns Hopkins study of patients with acute lung injury.
Because acute lung injury (ALI) — a syndrome marked by excessive fluid in the lungs and frequent multi-organ failure — is considered an archetype for critical illness, the researchers suspect PTSD is common among other ICU survivors as well.
"We usually think of PTSD as something you develop if you go to war, are sexually assaulted or suffer a similar emotional trauma," says Dale Needham, M.D., Ph.D., a critical care specialist at the Johns Hopkins University School of Medicine and senior author of the study published online in Psychological Medicine. "Instead, it may be as common, or more common, in ICU patients as in soldiers, but it's something many doctors — including psychiatrists — don't fully appreciate."
"Physical weakness usually gets better, but these mental symptoms often just linger," says study leader O. Joseph Bienvenu, M.D., Ph.D., an associate professor of psychiatry and behavioral sciences at Johns Hopkins. "We need to pay more attention to preventing and treating PTSD in these patients."
Bienvenu says the unusual thing about PTSD in ICU survivors is that they often experience flashbacks about delusions or hallucinations they had in the hospital, rather than events that actually occurred. Having a life-threatening illness is itself frightening, but delirium in these patients — who are attached to breathing machines and being given sedatives and narcotics — may lead to "memories" of horrible things that didn't happen, he adds.
"One woman thought her husband and the nurse were plotting to kill her," Bienvenu recalls.
For the study, the Johns Hopkins team observed 520 mechanically ventilated patients with ALI, recruited from 13 ICUs at four Baltimore hospitals between October 2004 and October 2007. Fifty-three percent survived their hospitalization, and 186 patients had at least one research visit over the subsequent two-year follow-up period.
The researchers found that 66 of the 186 patients (35 percent) had clinically significant symptoms of PTSD, with the greatest apparent onset occurring by the initial, three-month follow-up visit. Sixty-two percent of the survivors who developed PTSD still had symptoms at their two-year visit. Half of this same group was taking psychiatric medications, and 40 percent had seen a psychiatrist in the two years since being hospitalized with ALI.
The researchers also found that patients with depression before hospitalization were twice as likely to develop PTSD, and that those who spent more time in the ICU were more likely to experience symptoms.
Those who had sepsis (a severe response to infection) during their ICU stay, and those who were given high doses of opiates, were more likely to develop PTSD as well. Those given corticosteroids while in the ICU were less likely to develop PTSD, though the exact reasons why are unknown.
The delirium often associated with ICU stays and post-ICU PTSD may be partially a consequence of inflammation caused by sepsis. This inflammation may lead to a breakdown in the blood-brain barrier, which alters the impact on the brain of narcotics, sedatives and other drugs prescribed in the ICU.
Bienvenu says patients who have these risk factors need special attention. Simply educating them and their primary care doctors about the increased risk for PTSD would be a step in the right direction, he adds.
Each year, almost 1 million patients in the United States are hooked up to ventilators in an ICU, and 200,000 are estimated to develop ALI, usually as the result of infection. The lungs of healthy people allow the easy exchange of gases to enable oxygen to enter the bloodstream, and carbon dioxide to exit the body. In ALI patients, the normally light and dry lungs become heavy and soggy like a wet sponge.
People with PTSD, a form of anxiety disorder, may feel severely stressed or frightened even when they're no longer in danger. The symptoms fall into three categories: reliving the traumatic experience (flashbacks, nightmares), avoidance (feeling numb, detached, staying away from people and places that serve as reminders of the experience), and hyperarousal (being easily startled, having difficulty sleeping, irritability).
PTSD can impair quality of life and slow patients' recovery from a critical illness, keeping victims from returning to work or performing usual activities of daily life.
Needham, Bienvenu and others at Johns Hopkins are interested in whether changing care in the ICU can reduce the incidence of PTSD. Needham's team has reported on studies showing that early physical rehabilitation for ICU patients can speed and enhance recovery, and he says "psychological rehab" now deserves attention.
One European study looked at the use of ICU diaries, where nurses and family members recorded what was happening with the patients daily while they were in the ICU, sometimes taking photographs. The diaries were then given to the patients a month after leaving the ICU, with phone debriefing from a nurse. The intervention reduced PTSD symptoms by helping patients make sense of their ICU memories, Bienvenu says.
Other Johns Hopkins researchers involved in the study include Jonathan Gellar, M.P.H.; Benjamin M. Althouse, Sc.M.; Elizabeth Colantuoni, Ph.D.; Thiti Sricharoenchai, M.D.; Pedro A. Mendez-Tellez, M.D.; Cheryl R. Dennison, R.N., Ph.D.; and Peter J. Pronovost, M.D., Ph.D.
This research was supported by the National Institutes of Health's National Heart, Lung, and Blood Institute (Acute Lung Injury SCCOR Grant P050 HL73994 and R01 HL88045).
For more information:
Stephanie Desmon | EurekAlert!
Routing gene therapy directly into the brain
07.12.2017 | Boston Children's Hospital
New Hope for Cancer Therapies: Targeted Monitoring may help Improve Tumor Treatment
01.12.2017 | Berliner Institut für Gesundheitsforschung / Berlin Institute of Health (BIH)
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...
With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong
Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...
An interdisciplinary group of researchers interfaced individual bacteria with a computer to build a hybrid bio-digital circuit - Study published in Nature Communications
Scientists at the Institute of Science and Technology Austria (IST Austria) have managed to control the behavior of individual bacteria by connecting them to a...
Physicists in the Laboratory for Attosecond Physics (run jointly by LMU Munich and the Max Planck Institute for Quantum Optics) have developed an attosecond electron microscope that allows them to visualize the dispersion of light in time and space, and observe the motions of electrons in atoms.
The most basic of all physical interactions in nature is that between light and matter. This interaction takes place in attosecond times (i.e. billionths of a...
Transistors based on carbon nanostructures: what sounds like a futuristic dream could be reality in just a few years' time. An international research team working with Empa has now succeeded in producing nanotransistors from graphene ribbons that are only a few atoms wide, as reported in the current issue of the trade journal "Nature Communications."
Graphene ribbons that are only a few atoms wide, so-called graphene nanoribbons, have special electrical properties that make them promising candidates for the...
08.12.2017 | Event News
07.12.2017 | Event News
05.12.2017 | Event News
08.12.2017 | Life Sciences
08.12.2017 | Information Technology
08.12.2017 | Information Technology