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Three-Dimensional Visualization of Myocardial Ischemia Based on the Standard Twelve-Lead Electrocardiogram.

Ma Y, Sheng Y, Ruixia T, Xun C - Comput Math Methods Med (2016)

Bottom Line: A novel method was proposed for transforming the ischemic information in the 12-lead electrocardiogram (ECG) into the pseudo-color pattern displayed on a 3D heart model based on the projection of a ST injury vector in this study.The projection of the ST injury vector at a point on the heart surface was used for identifying the presence of myocardial ischemia by the difference between the projection value and the detection threshold.In addition, the diagnostic accuracy of the proposed method was further confirmed by the coronary angiography.

View Article: PubMed Central - PubMed

Affiliation: Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui 230027, China.

ABSTRACT
A novel method was proposed for transforming the ischemic information in the 12-lead electrocardiogram (ECG) into the pseudo-color pattern displayed on a 3D heart model based on the projection of a ST injury vector in this study. The projection of the ST injury vector at a point on the heart surface was used for identifying the presence of myocardial ischemia by the difference between the projection value and the detection threshold. Supposing that myocardial ischemia was uniform and continuous, the location and range of myocardial ischemia could be accurately calculated and visually displayed in a color-encoding way. The diagnoses of the same patient were highly consistent (kappa coefficient k = 0.9030) between the proposed method used by ordinary people lacking medical knowledge and the standard 12-lead ECG used by experienced cardiologists. In addition, the diagnostic accuracy of the proposed method was further confirmed by the coronary angiography. The results of this study provide a new way to promote the development of the 3D visualization of the standard 12-lead ECG, which has a great help for inexperienced doctors or ordinary family members in their diagnosis of patients with myocardial ischemia.

No MeSH data available.


Related in: MedlinePlus

Results of a 69-year-old female patient. (a) Her 12-lead ECG. (b) Her pattern of myocardial ischemia displayed on a 3D heart model.
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fig3: Results of a 69-year-old female patient. (a) Her 12-lead ECG. (b) Her pattern of myocardial ischemia displayed on a 3D heart model.

Mentions: 48 patients randomly selected from the total subjects, 25 males and 23 females, age from 46 to 93 years, were diagnosed by ordinary people without medical knowledge and experienced cardiologists, respectively. Although the total positive and negative numbers of the two diagnostic results were the same, their common positive or negative numbers are different. The fourfold table is shown in Table 1. The results from Kappa statistical analysis are as follows: the observation agreement P0 = 0.9583; the opportunity consistency Pe = 0.5703; Kappa coefficient k = 0.9030. Considering the sampling error, u-test was carried out for the assumption of k = 0. There is a strong consistency (k > 0.81) between the two methods due to the result of u = 13.47 larger than the standard normal quantile of 1.96. The inconsistent diagnostic results mainly occurred in the ST deviation near the threshold value of 0.1 mV. In this case, the repeatability of the 12-lead ECG detection is very poor, so it needs to be combined with clinical data detected by other equipment to make the diagnosis. In fact, many experienced cardiologists were also full of praise for the patterns displayed on the 3D heart model because of the obvious advantages in the determination of the region of myocardial ischemia. The results of a 69-year-old female patient are shown in Figure 3. She was diagnosed with extensive regional myocardial ischemia in the anterior, lateral, and inferior walls by an experienced cardiologist with her 12-lead ECG (see Figure 3(a)). Figure 3(b) is the patient's pattern of myocardial ischemia displayed on a 3D heart model. Obviously, the region of myocardial ischemia is easy to be identified; even an experienced cardiologist cannot imagine such a vivid image in his brain.


Three-Dimensional Visualization of Myocardial Ischemia Based on the Standard Twelve-Lead Electrocardiogram.

Ma Y, Sheng Y, Ruixia T, Xun C - Comput Math Methods Med (2016)

Results of a 69-year-old female patient. (a) Her 12-lead ECG. (b) Her pattern of myocardial ischemia displayed on a 3D heart model.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4940520&req=5

fig3: Results of a 69-year-old female patient. (a) Her 12-lead ECG. (b) Her pattern of myocardial ischemia displayed on a 3D heart model.
Mentions: 48 patients randomly selected from the total subjects, 25 males and 23 females, age from 46 to 93 years, were diagnosed by ordinary people without medical knowledge and experienced cardiologists, respectively. Although the total positive and negative numbers of the two diagnostic results were the same, their common positive or negative numbers are different. The fourfold table is shown in Table 1. The results from Kappa statistical analysis are as follows: the observation agreement P0 = 0.9583; the opportunity consistency Pe = 0.5703; Kappa coefficient k = 0.9030. Considering the sampling error, u-test was carried out for the assumption of k = 0. There is a strong consistency (k > 0.81) between the two methods due to the result of u = 13.47 larger than the standard normal quantile of 1.96. The inconsistent diagnostic results mainly occurred in the ST deviation near the threshold value of 0.1 mV. In this case, the repeatability of the 12-lead ECG detection is very poor, so it needs to be combined with clinical data detected by other equipment to make the diagnosis. In fact, many experienced cardiologists were also full of praise for the patterns displayed on the 3D heart model because of the obvious advantages in the determination of the region of myocardial ischemia. The results of a 69-year-old female patient are shown in Figure 3. She was diagnosed with extensive regional myocardial ischemia in the anterior, lateral, and inferior walls by an experienced cardiologist with her 12-lead ECG (see Figure 3(a)). Figure 3(b) is the patient's pattern of myocardial ischemia displayed on a 3D heart model. Obviously, the region of myocardial ischemia is easy to be identified; even an experienced cardiologist cannot imagine such a vivid image in his brain.

Bottom Line: A novel method was proposed for transforming the ischemic information in the 12-lead electrocardiogram (ECG) into the pseudo-color pattern displayed on a 3D heart model based on the projection of a ST injury vector in this study.The projection of the ST injury vector at a point on the heart surface was used for identifying the presence of myocardial ischemia by the difference between the projection value and the detection threshold.In addition, the diagnostic accuracy of the proposed method was further confirmed by the coronary angiography.

View Article: PubMed Central - PubMed

Affiliation: Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui 230027, China.

ABSTRACT
A novel method was proposed for transforming the ischemic information in the 12-lead electrocardiogram (ECG) into the pseudo-color pattern displayed on a 3D heart model based on the projection of a ST injury vector in this study. The projection of the ST injury vector at a point on the heart surface was used for identifying the presence of myocardial ischemia by the difference between the projection value and the detection threshold. Supposing that myocardial ischemia was uniform and continuous, the location and range of myocardial ischemia could be accurately calculated and visually displayed in a color-encoding way. The diagnoses of the same patient were highly consistent (kappa coefficient k = 0.9030) between the proposed method used by ordinary people lacking medical knowledge and the standard 12-lead ECG used by experienced cardiologists. In addition, the diagnostic accuracy of the proposed method was further confirmed by the coronary angiography. The results of this study provide a new way to promote the development of the 3D visualization of the standard 12-lead ECG, which has a great help for inexperienced doctors or ordinary family members in their diagnosis of patients with myocardial ischemia.

No MeSH data available.


Related in: MedlinePlus