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MRI Study Ties Common Sleep Disorder to Memory Loss

By MedImaging staff writers
Posted on 15 Jul 2008
For the first time, researchers have discovered that individuals with sleep apnea show tissue loss in brain regions that help store memory.

Reported in the June 27, 2008, issue of the journal Neuroscience Letters, the study's findings stress the importance of early detection of the disorder, which afflicts an estimated 20 million in the United States alone. Sleep apnea occurs when a blocked airway repeatedly stops the sleeper's breathing, resulting in loud bursts of snoring and chronic daytime fatigue. Memory loss and difficulty focusing are also common complaints. Earlier research had linked the disorder to a higher risk of stroke, heart disease, and diabetes.

"Our findings demonstrate that impaired breathing during sleep can lead to a serious brain injury that disrupts memory and thinking,” said principal investigator Ronald Harper, a professor of neurobiology at the David Geffen School of Medicine at the University of California, Los Angeles (UCLA; USA).

The study focused on structures called mammillary bodies, so called because they resemble small breasts, on the underside of the brain. The UCLA researchers scanned the brains of 43 sleep apnea patients, using magnetic resonance imaging (MRI) to collect high-resolution images of the entire brain, including slices of the mammillary bodies.

The structures' small size and proximity to bone and fluid make them difficult to measure by traditional MRI. Therefore, the researchers manually traced the mammillary bodies from the high-resolution scans and calculated their volumes from the hand-drawn outlines.

When they compared the results to images of 66 control subjects matched for age and gender, the scientists discovered that the sleep apnea patients' mammillary bodies were almost 20% smaller, particularly on the left side. "The findings are important because patients suffering memory loss from other syndromes, such as alcoholism or Alzheimer disease, also show shrunken mammillary bodies,” said lead author Dr. Rajesh Kumar, a UCLA assistant researcher in neurobiology. "Physicians treat memory loss in alcoholic patients with massive amounts of thiamine, or vitamin B1. We suspect that the dose helps dying cells to recover, enabling the brain to use them again.”

The scientists' next step is to determine how sleep apnea causes tissue loss in the mammillary bodies. Dr. Harper hypothesized that repeated drops in oxygen lead to the brain injury. During an apnea episode, the brain's blood vessels constrict, starving its tissue of oxygen and causing cellular death. The process also incites inflammation, which further damages the tissue.

"The reduced size of the mammillary bodies suggests that they've suffered a harmful event resulting in sizable cell loss,” Dr. Harper said. "The fact that patients' memory problems continue despite treatment for their sleep disorder implies a long-lasting brain injury.”

In a future study, Drs. Harper and Kumar will explore whether taking supplemental vitamin B1 helps restore sleep apnea patients' memory. The vitamin helps move glucose into the cells, preventing their death from oxygen starvation. "UCLA researchers used sophisticated imaging technology to identify brain lesions associated with impaired memory in individuals with obstructive sleep apnea,” said Dr. Elizabeth G. Nabel, director of the U.S. National Heart, Lung, and Blood Institute (Bethesda, MD, USA), which funded the study. "These results underscore the importance of early diagnosis and treatment of sleep-disordered breathing, which can have long-term effects on patients' health and well-being.”

Obstructive sleep apnea occurs when the muscles in the throat, soft palate, and tongue relax during sleep and sag, narrowing the airway. The tongue slides to the back of the mouth, blocking the windpipe and cutting off oxygen to the lungs. The sleeper wakes up, gasping for air, and falls back into a fitful sleep. The cycle can repeat itself hundreds of times per night.


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89 (41.961669921875): SELECT id,name,title FROM jos_deeppockets WHERE cat=10 AND TYPE='file_folder' AND published=1 AND id != 294743300 AND id != 294743301 AND id != 294743302 AND id != 294743303 AND id != 294743304 AND id != 294743305 AND id != 294743306 AND id != 294743307 AND id != 294743308 AND id != 294743309 AND id != 294743310 AND metakey != 'aacc' ORDER BY `ordering`
90 (73.909759521484): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (41.961669921875): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (33.855438232422): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (33.855438232422): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (34.809112548828): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (42.200088500977): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (236.03439331055): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
105 (147.10426330566): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
106 (499.96376037598): 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=290180000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (179.05235290527): 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=290180000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (424.86190795898): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
109 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
110 (204.08630371094): 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=290180000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (870.94306945801): 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=290180000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (554.08477783203): 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
113 (334.02442932129): 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
114 (122.0703125): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
115 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
116 (85.115432739258): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
117 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
118 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
119 (39.100646972656): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
120 (54.836273193359): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
121 (83.208084106445): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
122 (331.87866210938): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 21332.979202271): 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
124 (556.94580078125): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=290180000 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=290180000 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 8074.0451812744): ( 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
126 (79.870223999023): ( 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
127 (374.79400634766): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
128 (48.160552978516): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
129 (259.8762512207): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
130 (43.153762817383): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
131 (230.07392883301): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
132 (39.100646972656): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
133 (244.140625): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
134 (82.969665527344): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
135 (528.09715270996): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (324.96452331543): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (262.02201843262): SELECT name FROM jos_deeppockets WHERE id=212
138 (44.107437133789): SELECT name FROM jos_deeppockets WHERE id=212
139 (615.11993408203): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (530.95817565918): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
142 (49.114227294922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
143 (!!!!! 10003.089904785): TRUNCATE TABLE jos_trademed_module
144 (140.90538024902): 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=290180000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (81.062316894531): 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=290180000 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (904.08325195312): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (73.19450378418): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (75.101852416992): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
149 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
150 (!!!!! 1517.0574188232): 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
151 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
152 (49.114227294922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
153 (37.908554077148): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=290180000 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=290180000 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (34.093856811523): 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=212 or channel_id is null)
155 (37.908554077148): 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=212 or channel_id is null)
156 (51.975250244141): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (63.896179199219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
158 (47.206878662109): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=290180000 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=290180000 AND published='1' LIMIT 1
159 (97.036361694336): select jos_twitters.link from jos_twitters where cat=10
160 (44.107437133789): select jos_facebook.link from jos_facebook where cat=10
161 (41.007995605469): select jos_google_plus.link from jos_google_plus where cat=10
162 (40.054321289062): select jos_linkedin.link from jos_linkedin where cat=10
163 (309.22889709473): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (!!!!! 2715.8260345459): insert into jos_banners_delta values (14615,'2025-06-30 06:37:09','216.73.216.249','view'),(14202,'2025-06-30 06:37:09','216.73.216.249','view'),(14203,'2025-06-30 06:37:09','216.73.216.249','view')