ß-Blockers for Cardiac CT: A Primer for the Radiologist
Harpreet K. Pannu1,
William Alvarez, Jr.2 and
Elliot K. Fishman1
1 The Russell H. Morgan Department of Radiology and Radiological Science, Johns
Hopkins Medical Institutions, Baltimore, MD, and Department of Radiology,
Johns Hopkins Outpatient Center, JHOC 3235A, 601 N Caroline St., Baltimore, MD
21287.
2 Department of Pharmacy, Johns Hopkins Medical Institutions, Baltimore,
MD.

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Fig. 1A ECG lead strips. (Reprinted with permission from ACLS Provider
Manual, © 2001, 2002 American Heart Association
[19]) Second-degree heart
block, type I. There is progressive lengthening of P-R interval until QRS
complex is dropped. Arrow indicates P wave, which does not have accompanying
QRS.
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Fig. 1B ECG lead strips. (Reprinted with permission from ACLS Provider
Manual, © 2001, 2002 American Heart Association
[19]) Type II (high block).
Regular PRQRS intervals occur until there are two dropped beats.
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Fig. 1C ECG lead strips. (Reprinted with permission from ACLS Provider
Manual, © 2001, 2002 American Heart Association
[19]) Third-degree
atrioventricular block. There is no relationship between P waves and QRS
complex. There is junctional escape pacemaker giving narrow QRS.
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Copyright © 2006 by the American Roentgen Ray Society.