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Biomedical subjects

K Kehl

Publications and source records attributed to K Kehl.

6 recordsLinked to original sources
PubMed1991

[Necrosis-Q in the mapping ECG].

In this study 57 test persons 15 healthy ones, 42 patients with myocardial infarction with disturbances of the wall excursion) were examined by means of the mapping ECG, the classical ECG and the echocardiography. Considering the healthy test persons the normal values of the Q-deflections were established for every individual lead of the mapping ECG and of this the borderline values for the necrosis-Q (Q less than Q(m-1 s] were derived. The topographic coordination was performed with the help of a computer-aided picture of the thoracic surface. The determination of the localization of an echocardiographically proved disturbance of the wall excursion by means of the mapping ECG on the basis of the borderline values stated for the Q-deflections was carried out with an efficiency of 0.810 and by means of the classical ECG with an efficiency of 0.690. The information of the Q-deflections in the mapping ECG about the presence of an echocardiographically provable disturbance of the wall excursion is possible with an efficiency of 0.833. For the diagnosis of an infarction all infarction-typical parameters should always be used simultaneously. The clinical significance of the diagnostics of myocardial infarction by means of the mapping ECG lies in the exact localisation, the gradual valuation of the size of the infarction, in the recognition of changed potential distribution pattern as sign of the activity of a coronary heart disease with the complication of a myocardial infarction and the establishment of smaller as well as nontransmural myocardial infarctions with non-invasive methods.

Diagnosis, Computer-Assisted↗
PubMed1990

[Mini-mapping ECG].

63 patients with clearly defined myocardial infarction and an echocardiographically evident akinesia and hypokinesia, respectively, were examined by means of the echocardiography, the conventional ECG (12 leads) and the classical mapping ECG (69 leads). From the latter a mini-mapping ECG (12 chest electrodes) was led. IN 20% of the cases we did not find an accordance between the classical mapping ECG and the mini-mapping ECG in the localization of an echocardiographically proved disturbance of the excursion of the heart wall. In these cases small circumscribed myocardial lesions were concerned which were located particularly postero-inferiorly, the proof of which restricted itself to a thoracic surface less than 54-108 cm2 in the classical mapping ECG. But in larger lesions of the myocardium already the conventional ECG shows correct diagnostic statements. The coordination of the myocardial infarctions to the individual parts of the heart can be performed on the basis of a topographic mapping ECG card. A quantitative estimation of the electrocardiographic findings is not possible with the mini-mapping-ECG. The diagnostic valency of the mini-mapping-ECG is to be arranged only in the third place after the classical mapping ECG and the conventional ECG!

Coronary Disease↗
PubMed1990

[Gradual evaluation of repolarization disorders with ECG mapping].

143 test persons, (31 healthy persons, 30 borderline cases and 82 patients with chronic coronary heart disease) were examined at rest and on submaximal exertion by means of a mapping ECG (72 electrodes) and their findings were valuated depending upon the severity of the chronic coronary heart disease. The significance of the individual mapping ECG parameters in gradually valuating the disturbances of repolarisation was stated by correlation to the severity of the chronic heart disease and decreased in following order: 1. relative surfaces, 2. total surface with ST decrease in mV, 3. maximum decrease of ST, 4.4. sum of the decrease of ST in mV, 5. sum of negative area integrals of ST and 6. the minimum quotient of increase. The extension of a myocardial ischaemia could be stated with the total area by means of decreases of ST and its maximum by means of the maximal decrease of ST. The severity of the coronary heart disease could be gradually estimated with the "relative surfaces" of the mapping ECG at rest in mild to moderate degrees of severity and under submaximal exertion in all degrees of severity of the coronary heart disease. In a gradual evaluation of the mapping ECG the extension, the intensity, localisation and kind of the disturbance of the myocardium must be considered with regard to the dipole behaviour and to the potential decrease of the cardioelectric field as well as to the degree of severity of the disease.

Coronary Disease↗
PubMedDate not supplied

[ECG mapping in heart muscle hypertrophy].

67 test persons (15 healthy persons, 52 patients with coronary heart disease, of them 28 patients with and 24 patients without myocardial hypertrophy) were examined by means of a mapping ECG (69 leads) and the echocardiography. For every individual lead of the mapping ECG the mean values and simple scattering of the R and S potentials of 15 normal persons have been established. Of this we led the limit values for left heart and right heart hypertrophy for every individual lead. We are able to make evident that for the determination of a myocardial hypertrophy the principle of Sokolow's index can be transferred to R (max) and S (min) of the mapping ECG. A quantification of the myocardial hypertrophy by means of the R-potential summation method presupposes a correction of the normal potential decrease in the cardio-electric field. A regionally differently characterized myocardial hypertrophy can be recognized with the help of the mapping ECG. By means of an exercise-induced mapping ECG hypertrophy-caused repolarisation disturbances can highly significantly be demarcated (p less than 0.001) from ischaemia-caused ones. The difference mapping is suitable as mapping ECG documentation for a myocardial hypertrophy.

Cardiomegaly↗