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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.


Figure 1
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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.

 

Figure 2
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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 PR–QRS intervals occur until there are two dropped beats.

 

Figure 3
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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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