The EKG in the patient treated with calcium channel blockers
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Electrocardiographic Findings
- In patients with sinus node disease, verapamil and diltiazem may cause severe bradycardia and even sinus arrest.
- Effect on rate depends on the balance between the effect on the conduction system and a reflex increase in the heart rate due to vasodilation.
- Diltiazem and verapamil may prolong the PR interval, nifedipine has no effect.
- No effect on the QRS or the QTc
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
