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Source: Nitric Oxide For COVID-19  Aug 27, 2020  2 years ago
Nitric Oxide For COVID-19: Study Shows Inhaled Nitric Oxide Could Be Used As An Adjunct Therapy For Pregnant COVID-19 Patients
Nitric Oxide For COVID-19: Study Shows Inhaled Nitric Oxide Could Be Used As An Adjunct Therapy For Pregnant COVID-19 Patients
Source: Nitric Oxide For COVID-19  Aug 27, 2020  2 years ago
Nitric Oxide For COVID-19: According to researchers from Massachusetts General Hospital (MGH), inhaled nitric oxide (NO) can be a valuable adjunct respiratory therapy for pregnant women with severe and critical COVID-19.

It was found that the delivery of the therapeutic gas to six COVID-19 pregnant patients admitted to MGH, resulted in a rapid and sustained improvement in cardiopulmonary function and decreased inflammation. The resolution of viral infection within 22 days was observed in five of the six patients, findings that could have important implications for treating COVID-19 patients.
The study findings were published in the journal: Obstetrics & Gynecology
Dr Lorenzo Berra, MD, investigator in the Department of Anaesthesia, Critical Care and Pain Medicine at MGH, and the corresponding author of the study told Thailand Medical News, "We noted rapid relief from breathlessness in these patients, with lower respiratory rate and better oxygenation after mask administration of high concentration nitric oxide, with no adverse side effects."
Dr Berra further added, "In addition, inflammatory markers showed a rapid decrease after breathing nitric oxide and five of the six patients in our study showed viral clearance from nasopharyngeal swabs by 22 days after COVID-19 diagnosis. All patients were discharged in stable condition from the hospital. We found these results to be very encouraging."
It has been show that inhaled nitric oxide acts as a selective pulmonary vasodilator, increasing oxygenation by dilating or opening constricted blood vessels, especially in more well-ventilated areas of the lung, thereby improving intrapulmonary shunt fraction.
Therapies involving nitric oxide were approved by the U.S. Food and Drug Administration (FDA) in 1999 for the treatment of persistent pulmonary hypertension in newborns. Since then, NO has also been used off-label for many pediatric and adult clinical applications, including pulmonary hypertension in pregnancy, post-cardiac surgery, lung transplantation and acute respiratory distress syndrome (ARDS). The MGH study is the first to investigate the role of inhaled NO in pregnant people with COVID-19.
A review  from the US Centers for Disease Control and Prevention (CDC) suggests that pregnant women with COVID-19 are more likely to be hospitalized, are at increased risk of being admitted to the intensive care unit, and more often require mechanical ventilation compared to non-pregnant women.
The current lack of effective treatments for patients with severe or critical COVID-19 respiratory symptoms prompted a group of physicians from MGH to form an interdisciplinary team to offer pregnant women a novel treatment with inhaled NO to prevent progressive respiratory failure.
In the study, between April and June 2020, six hospitalized pregnant COVID-19 patients were given NO therapy. Each treatment was started within 48 hours of admission at a high but still safe dosage of 160 to 200 parts per million (ppm) of inhaled NO for 30 to 60 minute s twice-a-day.
Dr Bijan Safaee Fakhr, MD, an investigator in the Department of Anaesthesia, Critical Care and Pain Medicine at MGH and lead author of the article commented, "Even at that dosage, nitric oxide is easy to use and appears well tolerated. We found that nitric oxide inhalation therapy provided rapid relief of shortness of breath in these patients and that their respiratory rates decreased.”
Furthermore, he notes that three of the six women delivered four babies, including a set of twins, while in the hospital and that each infant tested negative for COVID-19 and remained in good condition 28 days after maternal admission.
These study findings suggested to Dr Safaee Fakhr that inhaled NO could result in improved placental oxygenation by improving maternal oxygenation.
The study team was further intrigued by the potential antiviral activity of inhaled NO in patients with COVID-19.
Dr Berra, who is also an associate professor of Anesthesia at Harvard Medical School cited a group of clinicians in China who, during the 2003-2004 SARS outbreak, administered inhaled NO to infected patients and reported that their chest X-ray findings cleared rapidly .
Dr Berra explained, "Because of the genetic similarities between Coronavirus SARS-CoV-1 (SARS) and CoV-2 (COVID-19), we decided to use high-dose nitric oxide to prevent viral replication."
The study team and doctors  learned was that five of the six patients in their cohort who received inhaled NO but no other antiviral medication while in the hospital were clear of the virus, as shown by two negative nasopharyngeal swabs obtained after 9 to 22 days from treatment initiation.
Dr Berra further added, "Additional randomized clinical trials are needed to confirm the antiviral effects and definitively determine the efficacy of inhaled nitric oxide on SARS-CoV-2. Irrespective of that, the cardiopulmonary, anti-inflammatory, and possible mild bronchodilatory effects of NO, coupled with its safety profile, offer clear evidence to support using high dose NO therapy for respiratory failure in pregnant women to combat a still unknown disease like COVID-19."
For more on Nitric Oxide For COVID-19 , keep on logging to Thailand Medical News.


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