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Abdominal imaging reveals bowel abnormalities in COVID-19 patients

Dr. Kamal Kant KohliBy Dr. Kamal Kant KohliPublished On 2020-05-17T09:09:48+05:30  |  Updated On 17 May 2020 3:39 AM GMT
Abdominal imaging reveals bowel abnormalities in COVID-19 patients

Researchers have found in a new retrospective study that Patients with COVID-19 can have bowel abnormalities, including ischemia.According to them possible explanations for the spectrum of bowel findings in patients with COVID-19 include direct viral infection, small vessel thrombosis, or nonocclusive mesenteric ischemia. The findings of the study have been published in the...

Researchers have found in a new retrospective study that Patients with COVID-19 can have bowel abnormalities, including ischemia.According to them possible explanations for the spectrum of bowel findings in patients with COVID-19 include direct viral infection, small vessel thrombosis, or nonocclusive mesenteric ischemia. The findings of the study have been published in the journal Radiology.

Several studies have evaluated the chest imaging findings in COVID-19, which helped improve understanding of how the disease affects the lungs. More recently, reports have documented that gastrointestinal symptoms, liver injury, and vascular findings are common in these patients. However, abdominal imaging findings have not yet been widely reported. Imaging findings may help physicians understand abdominal manifestations in patients with the infection. Therefore, the authors of this study set out to explore abdominal imaging findings in patients with COVID-19.

The retrospective study included 412 patients consecutively admitted to a single quaternary care center from March 27 to April 10, 2020, who tested positive for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The cohort included 241 men (58.5%) and 171 women (41.5%), with an average age of 57 years.

Records showed that 17% of patients had cross-sectional abdominal imaging, including 44 ultrasounds, 42 CT scans, and 1 MRI. Bowel abnormalities were seen on 31% of CT scans (3.2% of all patients) and were more frequent in intensive care unit (ICU) patients than other inpatients. Bowel findings included thickening and findings of ischemia such as pneumatosis (gas in the bowel wall) and portal venous gas. Surgical correlation in four patients revealed unusual yellow discoloration of bowel in three of the patients, and bowel infarction (dead bowel) in two patients.

"We found bowel abnormalities on imaging in patients with COVID-19, more commonly in sicker patients who went to the ICU," said Rajesh Bhayana, M.D., FRCPC, abdominal imaging fellow in the Department of Radiology at Massachusetts General Hospital in Boston.

In two patients who had bowel resection, pathology demonstrated ischemia with patchy necrosis (injury due to reduced arterial flow with patchy areas of cell death). Both had fibrin thrombi (blood clots) in submucosal arterioles (small arteries in the bowel wall), suggesting bowel ischemia in these patients might be caused by these small blood clots. Lung base findings led to a diagnosis of COVID-19 in one patient who presented with abdominal symptoms only. Of right upper quadrant ultrasounds, 87% were performed for liver laboratory findings, and 54% demonstrated a dilated sludge-filled gallbladder suggestive of cholestasis, or a decrease in bile flow.

"Some findings were typical of bowel ischemia, or dying bowel, and in those who had surgery we saw small vessel clots beside areas of dead bowel," Dr. Bhayana said. "Patients in the ICU can have bowel ischemia for other reasons, but we know COVID-19 can lead to clotting and small vessel injury, so bowel might also be affected by this."

ACE2 expression is most abundant in lung alveolar epithelial cells, enterocytes of the small intestine, and vascular endothelium suggesting that small bowel and vasculature may be susceptible to SARS-CoV-2 infection," they wrote.

The authors added that further studies are required to clarify the cause of bowel findings in patients with COVID-19 and to determine whether SARS-CoV-2 plays a direct role in bowel or vascular injury.

"Our study is preliminary, and more work is needed to understand the cause of bowel findings in these patients," Dr. Bhayana said.

Story Source:

Materials provided by Radiological Society of North America. Note: Content may be edited for style and length.

Journal Reference:

Rajesh Bhayana, Avik Som, Matthew D Li, Denston E Carey, Mark A Anderson, Michael A Blake, Onofrio Catalano, Michael S Gee, Peter F Hahn, Mukesh Harisinghani, Aoife Kilcoyne, Susanna I Lee, Amirkasra Mojtahed, Pari V Pandharipande, Theodore T Pierce, David A Rosman, Sanjay Saini, Anthony E Samir, Joseph F Simeone, Debra A Gervais, George Velmahos, Joseph Misdraji, Avinash Kambadakone. Abdominal Imaging Findings in COVID-19: Preliminary Observations. Radiology, 2020; 201908 DOI: 10.1148/radiol.2020201908

Abdominal imaging COVID-19 Covid 19 coronavirus 
Source : Radiology
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

    Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as an Editor-in-Chief for the Speciality Medical Dialogues section. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Before Joining Medical Dialogues, he has served at important positions in the medical industry in India including as the Hony. Secretary of the Delhi Medical Association as well as the chairman of Anti-Quackery Committee in Delhi and worked with other Medical Councils in India. Email: editorial@medicaldialogues.in. Contact no. 011-43720751

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