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Function of Heart's Helical Band Visualized in New MR Imaging Technology

By MedImaging International staff writers
Posted on 29 Dec 2008
Scientists have created images of the heart's muscular layer that show, for the first time, the connection between the arrangement of those muscles and the manner in which the human heart contracts. More precisely, they showed that the muscular band, which wraps around the inner chambers of the heart in a helix, is a kind of twisting thoroughfare along which each contraction of the heart travels.

Medical specialists have long have known that the heart's beat is not a straightforward in-and-out movement--that it has more than a little bit of a twist to it. "The heart twists to push blood out the same way you twist a wet towel to wring water out of it,” explained Dr. Morteza Gharib, the lead investigator on the study, and professor of aeronautics and bioengineering in the division of engineering and applied science at the California Institute of Technology (Caltech; Pasadena, USA).

Using a technique pioneered by Dr. Han Wen and his team at the U.S. National Institutes of Health (Bethesda, MD, USA), Dr. Gharib and his colleague Abbas Nasiraei Moghaddam, a Caltech graduate and visitor in bioengineering, were able to create some of the first dynamic images of normal myocardium in action at the tissue level. "We tagged and traced small tissue elements in the heart, and looked at them in space, so we could see how they moved when the heart contracts,” Dr. Gharib explained. "In this way, we were able to see where the maximum physical contraction occurs in the heart and when--and to show that it follows this intriguing helical loop.”

Characterization of local and global contractile activities in the myocardium is needed for a better determination of cardiac form and function, according to the investigators. The spatial distribution of regions that contribute the most to cardiac function play an important role in defining the myocardium's pumping parameters, ejection fraction and dynamic aspects such as twisting and untwisting. In general myocardium shortening tangent to the wall, and ventricular wall thickening are important parameters that characterize the regional contribution within the myocardium to the global function of the heart.

The researchers have calculated these parameters utilizing myocardium displacement fields that were gathered through displacement encoding with stimulated echoes-magnetic resonance imaging (DENSE-MRI) technique in three volunteers. High spatial resolution of the acquired data revealed transmural changes of thickening and tangential shortening with high fidelity in beating hearts. By filtering myocardium areas that demonstrated a tangential shortening index of less than 0.23, the investigators were able to identify the complete or portion of a macrostructure composed of connected regions in the form of a helical bundle within the left ventricle mass.

With each beat of the heart, a wave of contraction starts at the heart's apex--which, despite its name, is actually at the very bottom of the heart--and then travels up through the myocardium. "The only time the whole helix shows up in the images is at the end of systole, which is when the heart is contracting,” noted Dr. Gharib. "This simple band structure is akin to an engine behind the heart pumping action.”

In addition to going a long way toward resolving the decades-long structure/function dispute surrounding Torrent-Guasp's work, this finding also has major implications for the surgical treatment of heart disease, according to Dr. Gharib. "It's going to change the way we repair the heart,” he explained. Knowing that the contractile wave travels along the helical pathway--instead of occurring throughout the heart all at once--has implications for which parts of the heart will be most vulnerable to a surgeon's scalpel, for instance. Seventy-five percent of the function of the heart depends on this muscle. Surgeons now know what to cut and what not to cut. This will help them to come up with new and more effective surgical procedures.”

The study was published in the December 2008 issue of the journal AJP Heart and Circulatory Physiology.

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89 (32.901763916016): 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 (61.03515625): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (45.061111450195): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (45.061111450195): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (27.179718017578): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (27.179718017578): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
105 (55.074691772461): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
106 (49.114227294922): 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=294721532 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (49.114227294922): 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=294721532 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (81.062316894531): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
109 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
110 (46.968460083008): 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=294721532 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (509.02366638184): 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=294721532 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (746.01173400879): 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 (382.1849822998): 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 (120.16296386719): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
115 (108.00361633301): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
116 (79.870223999023): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
117 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
118 (77.962875366211): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
119 (57.93571472168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
120 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
121 (54.836273193359): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
122 (497.10273742676): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 37426.948547363): 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 (599.86114501953): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294721532 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294721532 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 7508.9931488037): ( 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 (82.969665527344): ( 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 (70.810317993164): 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 (36.001205444336): 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 (51.975250244141): 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 (28.848648071289): 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 (304.9373626709): 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 (38.14697265625): 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 (30.040740966797): 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 (27.894973754883): 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 (550.98533630371): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (424.86190795898): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (339.98489379883): SELECT name FROM jos_deeppockets WHERE id=212
138 (46.014785766602): SELECT name FROM jos_deeppockets WHERE id=212
139 (659.94262695312): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (661.13471984863): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (75.101852416992): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
142 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
143 (!!!!! 8444.07081604): TRUNCATE TABLE jos_trademed_module
144 (98.943710327148): 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=294721532 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (64.13459777832): 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=294721532 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (!!!!! 1080.9898376465): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (59.127807617188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (57.93571472168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
149 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
150 (!!!!! 1207.1132659912): 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 (73.909759521484): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
152 (43.869018554688): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
153 (50.067901611328): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294721532 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294721532 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (44.107437133789): 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 (35.04753112793): 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 (138.0443572998): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
158 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294721532 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294721532 AND published='1' LIMIT 1
159 (37.908554077148): select jos_twitters.link from jos_twitters where cat=10
160 (30.994415283203): select jos_facebook.link from jos_facebook where cat=10
161 (28.848648071289): select jos_google_plus.link from jos_google_plus where cat=10
162 (29.802322387695): select jos_linkedin.link from jos_linkedin where cat=10
163 (334.02442932129): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
164 (!!!!! 2422.0943450928): insert into jos_banners_delta values (14615,'2025-06-30 02:46:35','216.73.216.249','view'),(14202,'2025-06-30 02:46:35','216.73.216.249','view'),(14203,'2025-06-30 02:46:35','216.73.216.249','view')