Studies in intracardiac electrography in man
| Autor: | Harold D. Levine, Lewis Dexter, Harper K. Hellems, Martin H. Wittenborg |
|---|---|
| Rok vydání: | 1949 |
| Předmět: |
medicine.medical_specialty
medicine.diagnostic_test Left bundle branch block business.industry Right bundle branch block medicine.disease Ventricular tachycardia Intracardiac injection QRS complex medicine.anatomical_structure Ventricle Internal medicine cardiovascular system medicine Cardiology Right atrium Interventricular septum Cardiology and Cardiovascular Medicine business Electrocardiography |
| Zdroj: | American Heart Journal. 37:64-78 |
| ISSN: | 0002-8703 |
| DOI: | 10.1016/0002-8703(49)91429-5 |
| Popis: | A previous communication 1 was concerned with the electrical phenomena within the right atrium. Coincidentally with that study, observations were made of the potential variations within the right ventricle. The general technique employed has been described in the earlier publication and will be amplified somewhat in this paper. All studies of the potentials within the normal right ventricle have revealed an R wave as the first deflection of the ventricular complex. Hecht 2 described this as diminutive, but others have noted that it may attain considerable size. The presence of this R wave has been regarded uniformly as corroborative evidence that activation of the left side of the interventricular septum normally precedes activation of the right side. This asynchronism may be regarded as a kind of physiologic, incomplete right bundle branch block of minor grade. In left bundle branch block, 3,4 because septal activation proceeds form the right to the left side of the septum, this initial R wave is lost; and the ventricular complex in the right ventricle begins with an S wave. By the same token, the R wave is unusually prominent in right bundle branch block. Because the electrode has the twofold effect of functioning as both a recording and, by virtue of its mere contact, as a stimulating electrode, two other phenomena have been observed consistently: a tendency to premature ventricular beats or short runs of ventricular tachycardia and the induction of monophasic ventricular action currents. The former, from their appearance in the conventional leads, have been shown to correspond to our present conception of right ventricular premature beats. The latter have been found to disappear when the catheter is withdrawn slightly from its contact with the ventricular wall. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|