State diagrams of the heart – a new approach to describing cardiac mechanics
<p>Abstract</p> <p>Background</p> <p>Cardiac time intervals have been described as a measure of cardiac performance, where prolongation, shortening and delay of the different time intervals have been evaluated as markers of cardiac dysfunction. A relatively recently dev...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
BMC
2009-05-01
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| Series: | Cardiovascular Ultrasound |
| Online Access: | http://www.cardiovascularultrasound.com/content/7/1/22 |
| _version_ | 1819034042899628032 |
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| author | Brodin Lars-Åke Winter Reidar Johnson Jonas Bjällmark Anna Larsson Matilda Lundbäck Stig |
| author_facet | Brodin Lars-Åke Winter Reidar Johnson Jonas Bjällmark Anna Larsson Matilda Lundbäck Stig |
| author_sort | Brodin Lars-Åke |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Background</p> <p>Cardiac time intervals have been described as a measure of cardiac performance, where prolongation, shortening and delay of the different time intervals have been evaluated as markers of cardiac dysfunction. A relatively recently developed method with improved ability to measure cardiac events is Tissue Doppler Imaging (TDI), allowing accurate measurement of myocardial movements.</p> <p>Methods</p> <p>We propose the state diagram of the heart as a new visualization tool for cardiac time intervals, presenting comparative, normalized data of systolic and diastolic performance, providing a more complete overview of cardiac function. This study aimed to test the feasibility of the state diagram method by presenting examples demonstrating its potential use in the clinical setting and by performing a clinical study, which included a comparison of the state diagram method with established echocardiography methods (E/E' ratio, LVEF and WMSI). The population in the clinical study consisted of seven patients with non ST-elevation myocardial infarction (NSTEMI) and seven control subjects, individually matched according to age and gender. The state diagram of the heart was generated from TDI curves from seven positions in the myocardium, visualizing the inter- and intraventricular function of the heart by displaying the cardiac phases.</p> <p>Results</p> <p>The clinical examples demonstrated that the state diagram allows for an intuitive visualization of pathological patterns as ischemia and dyssynchrony. Further, significant differences in percentage duration between the control group and the NSTEMI group were found in eight of the totally twenty phases (10 phases for each ventricle), e.g. in the transition phases (Pre-Ejection and Post-Ejection). These phases were significantly longer (> 2.18%) for the NSTEMI group than for the control group (p < 0.05). No significant differences between the groups were found for the established echocardiography methods.</p> <p>Conclusion</p> <p>The test results clearly indicate that the state diagram has potential to be an efficient tool for visualization of cardiac dysfunction and for detection of NSTEMI.</p> |
| first_indexed | 2024-12-21T07:27:27Z |
| format | Article |
| id | doaj.art-84189445041d4581ab232a9242be2106 |
| institution | Directory Open Access Journal |
| issn | 1476-7120 |
| language | English |
| last_indexed | 2024-12-21T07:27:27Z |
| publishDate | 2009-05-01 |
| publisher | BMC |
| record_format | Article |
| series | Cardiovascular Ultrasound |
| spelling | doaj.art-84189445041d4581ab232a9242be21062022-12-21T19:11:38ZengBMCCardiovascular Ultrasound1476-71202009-05-01712210.1186/1476-7120-7-22State diagrams of the heart – a new approach to describing cardiac mechanicsBrodin Lars-ÅkeWinter ReidarJohnson JonasBjällmark AnnaLarsson MatildaLundbäck Stig<p>Abstract</p> <p>Background</p> <p>Cardiac time intervals have been described as a measure of cardiac performance, where prolongation, shortening and delay of the different time intervals have been evaluated as markers of cardiac dysfunction. A relatively recently developed method with improved ability to measure cardiac events is Tissue Doppler Imaging (TDI), allowing accurate measurement of myocardial movements.</p> <p>Methods</p> <p>We propose the state diagram of the heart as a new visualization tool for cardiac time intervals, presenting comparative, normalized data of systolic and diastolic performance, providing a more complete overview of cardiac function. This study aimed to test the feasibility of the state diagram method by presenting examples demonstrating its potential use in the clinical setting and by performing a clinical study, which included a comparison of the state diagram method with established echocardiography methods (E/E' ratio, LVEF and WMSI). The population in the clinical study consisted of seven patients with non ST-elevation myocardial infarction (NSTEMI) and seven control subjects, individually matched according to age and gender. The state diagram of the heart was generated from TDI curves from seven positions in the myocardium, visualizing the inter- and intraventricular function of the heart by displaying the cardiac phases.</p> <p>Results</p> <p>The clinical examples demonstrated that the state diagram allows for an intuitive visualization of pathological patterns as ischemia and dyssynchrony. Further, significant differences in percentage duration between the control group and the NSTEMI group were found in eight of the totally twenty phases (10 phases for each ventricle), e.g. in the transition phases (Pre-Ejection and Post-Ejection). These phases were significantly longer (> 2.18%) for the NSTEMI group than for the control group (p < 0.05). No significant differences between the groups were found for the established echocardiography methods.</p> <p>Conclusion</p> <p>The test results clearly indicate that the state diagram has potential to be an efficient tool for visualization of cardiac dysfunction and for detection of NSTEMI.</p>http://www.cardiovascularultrasound.com/content/7/1/22 |
| spellingShingle | Brodin Lars-Åke Winter Reidar Johnson Jonas Bjällmark Anna Larsson Matilda Lundbäck Stig State diagrams of the heart – a new approach to describing cardiac mechanics Cardiovascular Ultrasound |
| title | State diagrams of the heart – a new approach to describing cardiac mechanics |
| title_full | State diagrams of the heart – a new approach to describing cardiac mechanics |
| title_fullStr | State diagrams of the heart – a new approach to describing cardiac mechanics |
| title_full_unstemmed | State diagrams of the heart – a new approach to describing cardiac mechanics |
| title_short | State diagrams of the heart – a new approach to describing cardiac mechanics |
| title_sort | state diagrams of the heart a new approach to describing cardiac mechanics |
| url | http://www.cardiovascularultrasound.com/content/7/1/22 |
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