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Specialized MRI Detects Lung Abnormalities in Non-Hospitalized Long COVID Patients

By MedImaging International staff writers
Posted on 25 May 2022
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Image: Example CT, proton, proton and RBC:TP imaging from post-COVID-19 condition study participants (Photo courtesy of University of Sheffield)
Image: Example CT, proton, proton and RBC:TP imaging from post-COVID-19 condition study participants (Photo courtesy of University of Sheffield)

Beyond the acute respiratory symptoms of COVID-19 infection, which can result in severe illness, hospitalization and death, the medium and long‐term problems experienced by people following COVID‐19 can be considerable. Symptoms can persist months after initial infection. The presence of ongoing symptoms related to prior COVID-19 infection is known as post-COVID-19 condition, or long COVID. Although over 200 symptoms have been reported, the most common are breathlessness, fatigue and brain fog. Long COVID presents a global health burden, with many people unable to return to normal activities or employment months after becoming unwell. In long COVID, a breathing pattern disorder is commonly identified and contributes to breathlessness in a significant proportion of patients. However, whether there are additional reasons for their breathlessness remains unclear. Now, a special type of MRI has found lung abnormalities in patients who had previously had COVID-19, even those who had not been hospitalized with the illness, according to a new study.

In the study by researchers at the University of Sheffield (Sheffield, UK) and University of Oxford (Oxford, UK), a specialized type of MRI (Hp-XeMRI) found lung abnormalities in non-hospitalized patients with long COVID months after initial infection. The findings provide preliminary evidence that non-hospitalized long COVID patients may have abnormalities indicative of decreased lung function that cannot be detected with conventional CT imaging. Hp-XeMRI has shown promise in detecting abnormalities of alveolar gas exchange - where oxygen moves from the lungs to the bloodstream and carbon dioxide passes from the blood to the lungs - even when CT scans and lung function tests were normal. Hp-XeMRI enables the assessment of ventilation and gas exchange into red blood cells. It provides regional information of pulmonary vasculature integrity and may be able to identify lung abnormalities not apparent on CT.

For this prospective study, researchers set out to determine whether previously described lung abnormalities on Hp-XeMRI in post-hospitalized COVID-19 participants are also present in non-hospitalized participants with long COVID. Eleven non-hospitalized long COVID (NHLC) participants and 12 post-hospitalized COVID-19 (PHC) participants were enrolled from June 2020 to August 2021. All participants had symptoms of breathlessness. NHLC participants were 240-334 days from infection, and PHC participants were 105-190 days from infection. As a control group, healthy volunteers with no evidence of prior COVID-19 infection were recruited from staff at the University of Sheffield and the University of Oxford.

Participants were given chest CT, Hp-XeMRI, pulmonary function tests, one-minute sit-to-stand tests and breathlessness questionnaires. Control subjects underwent HP-XeMRI only. CT scans were analyzed for post-COVID lung disease severity using a previously published scoring system, and Full-scale Airway Network (FAN) modeling. Analysis used group and pair-wise comparisons between participants and controls, and correlations between participant clinical and imaging data. NHLC and PHC participants had normal or near normal CT scans.

The results showed that there were significant differences in mean red blood cell to tissue plasma ratio between healthy controls and PHC/NHLC participants, indicating potential differences in lung function. Although participants had normal or near normal CT scores, total lung diffusion capacity for carbon monoxide percentage was significantly lower between NHLC and PHC participants, potentially indicating a decrease in lung function but not structure. The researchers have said their next step is to expand their study to look at larger numbers of participants seen in dedicated post-COVID clinics at four UK centers.

“In a collaboration between the University of Oxford and the University of Sheffield, we have been able to identify abnormalities in the lungs of both hospitalized and non-hospitalized participants using a novel imaging technique, Hyperpolarized Xenon 129MRI, or Hp-XeMRI,” said the study’s senior author, Fergus Gleeson, M.B.B.S., from the Department of Oncology, University of Oxford and Department of Radiology, Oxford University Hospitals NHS Trust. “These abnormalities are not apparent on conventional imaging, and in some individuals were detected up to a year after their initial COVID-19 infection. We will assess different groups of participants who have had COVID and correlate the findings with physiological data, symptom-based questionnaires and cardiac MRI to better understand the clinical significance of our findings.”

“Using Hp-XeMRI may enable us to further understand the cause of breathlessness in long COVID patients, and ultimately lead to better treatments to improve this often debilitating symptom,” added study co-author James T. Grist, Ph.D., from University of Oxford.

Related Links:
University of Sheffield 
University of Oxford 

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91 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (39.100646972656): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (74.148178100586): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
99 (41.961669921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
100 (93.936920166016): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294793089 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
101 (92.983245849609): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294793089 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
102 (93.936920166016): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
103 (45.7763671875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
104 (380.03921508789): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294793089 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
105 (450.84953308105): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294793089 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
106 (412.94097900391): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294793062 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (432.96813964844): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
108 (299.93057250977): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
109 (76.055526733398): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
110 (46.968460083008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
111 (77.962875366211): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
112 (39.100646972656): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
113 (50.783157348633): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
114 (38.14697265625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
115 (175.95291137695): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
116 (!!!!! 43783.903121948): SELECT * FROM jos_deeppockets WHERE jos_deeppockets.cat = 10 AND jos_deeppockets.type = 'deeppockets_item' AND jos_deeppockets.published = 1 AND jos_deeppockets.created + INTERVAL 14 DAY >= NOW() ORDER BY jos_deeppockets.hits DESC LIMIT 7
117 (!!!!! 1058.1016540527): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
118 (63.896179199219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
119 (493.04962158203): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294793089 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294793089 AND type='deeppockets_item' AND published='1' LIMIT 1
120 (!!!!! 532827.13890076): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
121 (83.92333984375): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
122 (221.01402282715): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
123 (45.061111450195): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
124 (147.10426330566): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
125 (39.100646972656): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
126 (108.00361633301): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
127 (41.007995605469): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
128 (232.21969604492): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
129 (292.06275939941): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
130 (123.02398681641): SELECT name FROM jos_deeppockets WHERE id=212
131 (46.014785766602): SELECT name FROM jos_deeppockets WHERE id=212
132 (449.89585876465): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
133 (339.98489379883): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
134 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
135 (43.869018554688): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
136 (!!!!! 12341.022491455): TRUNCATE TABLE jos_trademed_module
137 (122.0703125): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294793089 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
138 (60.081481933594): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294793089 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
139 (583.88710021973): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
140 (82.969665527344): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
141 (89.168548583984): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
142 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
143 (!!!!! 1296.9970703125): SELECT jos_item.* FROM jos_item INNER JOIN jos_number ON jos_item.numberID=jos_number.id WHERE 1=1 AND (jos_item.imgMini<>'') AND jos_item.type='L' AND jos_item.numberID= ( SELECT jos_number.id FROM jos_number WHERE jos_number.journalID IN (10) and jos_number.id in (select distinct jos_number.id from jos_number join jos_item on jos_item.numberid=jos_number.id where jos_item.type='P') ORDER BY (CONVERT(SUBSTRING(issue,1,2),SIGNED) + (CONVERT(SUBSTRING(issue,3,2),SIGNED)*100)) DESC LIMIT 0,1 ) ORDER BY RAND() DESC LIMIT 6
144 (91.791152954102): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
145 (65.088272094727): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
146 (60.081481933594): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294793089 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294793089 AND type='deeppockets_item' AND published='1' LIMIT 1
147 (514.98413085938): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=0 or channel_id is null)
148 (47.922134399414): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=0 or channel_id is null)
149 (37.908554077148): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
150 (360.96572875977): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
151 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294793089 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294793089 AND published='1' LIMIT 1
152 (112.05673217773): select jos_twitters.link from jos_twitters where cat=10
153 (31.948089599609): select jos_facebook.link from jos_facebook where cat=10
154 (27.179718017578): select jos_google_plus.link from jos_google_plus where cat=10
155 (26.941299438477): select jos_linkedin.link from jos_linkedin where cat=10
156 (283.95652770996): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
157 (!!!!! 1292.9439544678): insert into jos_banners_delta values (14615,'2025-04-30 21:49:58','18.217.142.228','view'),(14202,'2025-04-30 21:49:58','18.217.142.228','view'),(14203,'2025-04-30 21:49:58','18.217.142.228','view')