Elektrokardiogramm und Herzlage

Schweizer, W

doi:10.1007/bf02122531

Cited by 11 publications

(2 citation statements)

References 256 publications

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“…Schweizer found that rotations within these limits produced no significant change in the mean electrical axis in the frontal plane. 25 Rotation of the heart on its longitudinal axis was also assumed to explain various electrical phenomena of the precordial electrodes. Wilson introduced "electric positions," based upon resemblance of the "unipolar" limb leads VL and VF with the right and left precordial leads, to account for variations in the mean electric axis of the limb leads of normal subjects with normal precordial electrocardiograms:`.…”

Section: Methodsmentioning

confidence: 99%

Relationship between the Electrocardiogram and the Position of the Heart as Determined by Biplane Angiocardiography

1961

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Anatomic orientation of the heart was determined in 53 patients by selective, biplane angiocardiography, and was compared with the mean electric axis and the location of the transition zone from conventional electrocardiograms. No significant correlation could be demonstrated between (a) the anatomic axis and the electric axis in the frontal plane, or (b) between the electric axis and rotation of the heart about its longitudinal axis, or (c) the location of the interventricular septum and the transition zone of the precordial leads. The electric variations are greater than can possibly be explained by known rotations of the heart about any anatomic axis. The degrees of rotation about the heart's longitudinal axis assumed in the concept of "electrical positions" is beyond the range found in normal or hypertrophied hearts. It is concluded that the electric positions of the heart should be abandoned in favor of direct description in three dimensions of the orientation of the mean electromotive force of the heart. Normal limits should be defined in percentiles or standard deviations.

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Section: Methodsmentioning

confidence: 99%

Relationship between the Electrocardiogram and the Position of the Heart as Determined by Biplane Angiocardiography

1961

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“…4) suggests that a conduction defect may have occurred in this circumstance-there was indeed a gross change in configuration of the QRS complexes to confirm this suspicion. It is important to note that, despite the man}' possible interfering factors, 19 physically turning the septum to the right consistently turned the 10-msec. vector rightward also.…”

Section: Relationship Between 10-msec Qrs Vector and Right Septal Sumentioning

confidence: 99%

Relationship Between the Anatomical Orientation of the Interventricular Septum and the Manifest Orientation of Ventricular Depolarization in Dogs

Horan

Hansen

Bousquet

1962

Circulation Research

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Exact anatomical orientation of the interventricular septum was compared with apparent direction of electrical activity during ventricular depolarization in 22 dogs. In 15 control animals, the mean orientation of a vector normal to the right septal surface was toward the front, to the right, and slightly headward. The mean orientation of the 10-msec. vector (QRS) was almost directly toward the front and slightly tailward. The mean orientation of the polar vector was to the left, slightly to the front, and slightly headward. The values for each of these means were obtained in spherical coordinates: anatomical vector--141.7 degrees azimuth, 20.2 degrees altitude; 10-msec. vector (QRS)--92.0 degrees azimuth, -9.4 degrees altitude; and polar vector--14.8 degrees azimuth, 20.0 degrees altitude. In 7 dogs, rotation of the heart to the right by means of previously implanted guy sutures consistently moved the 10-msec. vector to the right also, but there was simultaneous unpredictable deviation either headward or tailward of the electrical vector. Polar vector shift was not consistent. Rotational transformation of axes for each dog, bringing the vector of the right septal surface into coincidence with the negative X-axis, did not bring to a focus the scatter of orientations of either group of electrical vectors, indicating that variation in electrical position depends upon other factors in addition to variation in anatomical position.

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Elektrokardiographische und vektorkardiographische Untersuchungen beim chronischen Cor pulmonale

1961

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Elektrokardiogramm und Herzlage

Cited by 11 publications

References 256 publications

Relationship between the Electrocardiogram and the Position of the Heart as Determined by Biplane Angiocardiography

Relationship between the Electrocardiogram and the Position of the Heart as Determined by Biplane Angiocardiography

Relationship Between the Anatomical Orientation of the Interventricular Septum and the Manifest Orientation of Ventricular Depolarization in Dogs

Elektrokardiographische und vektorkardiographische Untersuchungen beim chronischen Cor pulmonale

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