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Noninvasive Technique Monitors Fetal Heartbeat

By MedImaging International staff writers
Posted on 24 Jun 2009
Small fluctuations in a fetus's heartbeat can indicate distress, but currently there is no way to detect such slight variations except during labor, when it could be too late to prevent serious or even fatal complications. Now, a new technology could allow much earlier monitoring of the fetal heartbeat.

Among other advantages, the system developed by a Massachusetts Institute of Technology (MIT; Cambridge, MA, USA) scientist and colleagues, is expected to be less expensive and easier to use than current technologies. It could also slash the rate of Cesarean deliveries by helping clinicians rule out potential problems that might otherwise prompt the procedure. Lastly, the device used today to monitor subtle changes in the fetal heartbeat during labor must be attached to the fetus itself, but the new product would be noninvasive.

"Our objective is to make a monitoring system that's simultaneously cheaper and more effective” than what is currently available, stated Gari Clifford, Ph.D., a lead research scientist at the Harvard- (Cambridge, MA, USA)-MIT Division of Health Sciences and Technology. Dr. Clifford expects that the system could be commercially available in two to three years pending U.S. food and Drug Administration (FDA) approval.

While only a minority of pregnancies suffer from fluctuations in the fetal heartbeat, the issue is nonetheless critical because those that do can result in bad outcomes. These problems include certain infections and a loss of oxygen to the baby if strangled by the baby's own umbilical cord.

Clinicians currently have two ways to detect the fetal heartbeat. Ultrasound can detect the heartbeat quite early in a pregnancy. However, it is not sensitive enough to capture variations in the rhythm that could indicate problems. Electrocardiography (ECG), which records the electrical activity of the heart, can capture subtle changes in the fetal heartbeat. The problem until now has been that there is no way to effectively use the technique to that end except by attaching an electrode to the baby's scalp during labor.

Physicians can monitor the fetal ECG signal noninvasively through electrodes on the mother's abdomen, but it is weak compared to the maternal heartbeat and surrounding noise. Furthermore, it has not been possible to separate the three signals without distorting characteristics of the fetal heartbeat key to identifying potential clinical problems. "The dominant signal turns out to be the mother's heartbeat, so teasing out a tiny fetal signal in the background noise without altering the clinical meaning of the fetal signal is a problem that has proved virtually insoluble,” said Dr. Clifford.

The new technology separates the maternal ECG signal from the fetus' and background due to a complex algorithm derived from the fields of signal processing and source separation. Together, these fields work to break any signal into its source components.

To use the system, which the team believes could be deployed during the second trimester of pregnancy (approximately 20 weeks) and perhaps earlier, a woman would wear a wide belt around her abdomen fitted with several ECG electrodes. (The prototype has 32, but that number will be lower in the final device.) The data collected from those electrodes are then fed to a monitor and analyzed with the new algorithm, which in turn separates the different signals.

Dr. Clifford noted that "one of the nice things about monitoring the fetal ECG through the mother's abdomen is you're getting a multidimensional view of the fetal heart” because its electrical activity is recorded from many different angles. The single probe now used to monitor the heartbeat during labor gives data from only one direction. "So with our system it's like going from a one-dimensional slice of an image to a hologram,” Dr. Clifford said. That better view could help catch problems that might have gone unnoticed before. "If you're looking in just one direction and an abnormality is occurring perpendicular to that direction, you won't see it,” Dr. Clifford said.

The large amounts of three-dimensional (3D) data captured with the new system could also open up a new field of research: fetal electrocardiography. "The world of fetal ECG analysis is almost completely unexplored,” Dr. Clifford said, because the current monitoring system can only be used during labor and "essentially gives only a monocular view.”

Dr. Clifford's major collaborator on the clinical work is Dr. Adam Wolfberg, an obstetrician and a fellow in maternal fetal medicine at Tufts Medical Center (Boston, MA, USA). To validate the algorithm and build the system, he turned to E-Trolz (North Andover, MA, USA).

Recently, several patent applications on the work were licensed by MindChild Medical, Inc. (Boston, MA, USA). The original development of the device was funded by the Center for Integration of Medicine and Innovative Technology (CIMIT).

Related Links:

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87 (89.883804321289): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294724078 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
88 (36.001205444336): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294724078 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (40.054321289062): 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 (118.01719665527): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (53.167343139648): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (41.961669921875): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (39.100646972656): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (118.01719665527): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (43.869018554688): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (39.100646972656): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (58.889389038086): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (39.100646972656): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (39.100646972656): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (133.99124145508): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
105 (77.962875366211): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
106 (120.87821960449): 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=294724078 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (85.830688476562): 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=294724078 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (167.1314239502): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
109 (86.069107055664): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
110 (82.969665527344): 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=294724078 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (670.9098815918): 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=294724078 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (951.05171203613): 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 (742.91229248047): 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 (611.0668182373): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
115 (110.86463928223): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
116 (272.98927307129): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
117 (236.98806762695): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
118 (453.94897460938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
119 (53.882598876953): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
120 (190.97328186035): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
121 (229.83551025391): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
122 (!!!!! 1046.895980835): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 58290.004730225): 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 (641.1075592041): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294724078 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294724078 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (315.18936157227): ( 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 (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
127 (292.06275939941): 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 (291.82434082031): 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 (334.9781036377): 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 (283.95652770996): 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 (43.153762817383): 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 (36.954879760742): 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 (191.21170043945): 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 (37.908554077148): 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 (!!!!! 5091.9055938721): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (!!!!! 4231.9297790527): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (241.99485778809): SELECT name FROM jos_deeppockets WHERE id=214
138 (!!!!! 1466.9895172119): SELECT name FROM jos_deeppockets WHERE id=214
139 (!!!!! 1077.8903961182): 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 '((;)|(^))214((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (!!!!! 1430.9883117676): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))214((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (934.12399291992): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
142 (242.94853210449): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
143 (!!!!! 21398.067474365): TRUNCATE TABLE jos_trademed_module
144 (!!!!! 4121.0651397705): 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=294724078 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (275.1350402832): 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=294724078 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (!!!!! 3889.0838623047): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (636.10076904297): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (!!!!! 1359.9395751953): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
149 (100.13580322266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
150 (!!!!! 1287.9371643066): 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 (203.13262939453): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
152 (71.048736572266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
153 (49.114227294922): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294724078 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294724078 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (50.067901611328): 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=214 or channel_id is null)
155 (41.961669921875): 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=214 or channel_id is null)
156 (57.93571472168): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (115.15617370605): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
158 (!!!!! 2543.9262390137): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294724078 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294724078 AND published='1' LIMIT 1
159 (71.048736572266): select jos_twitters.link from jos_twitters where cat=10
160 (43.869018554688): select jos_facebook.link from jos_facebook where cat=10
161 (41.961669921875): select jos_google_plus.link from jos_google_plus where cat=10
162 (41.961669921875): select jos_linkedin.link from jos_linkedin where cat=10