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Influence of Zoledronic Acid on Atrial Electrophysiological Parameters and Electrocardiographic Measurements
Author(s) -
TISDALE JAMES E.,
ALLEN MATTHEW R.,
OVERHOLSER BRIAN R.,
JAYNES HEATHER A.,
KOVACS RICHARD J.
Publication year - 2015
Publication title -
journal of cardiovascular electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.193
H-Index - 138
eISSN - 1540-8167
pISSN - 1045-3873
DOI - 10.1111/jce.12641
Subject(s) - medicine , repolarization , placebo , effective refractory period , electrophysiology , perfusion , saline , qt interval , electrocardiography , cardiology , anesthesia , pathology , alternative medicine
Zoledronic Acid Alters Atrial Electrophysiology Introduction Our objective was to determine effects of zoledronic acid (ZA) on atrial electrophysiological parameters and electrocardiographic measurements. Methods and Results Ex vivo perfusion study : Isolated guinea pig hearts were perfused with modified Krebs‐Henseleit (K‐H) buffer with or without ZA 0.07 mg/kg/L (each n = 6). In ZA‐perfused hearts, atrial action potential at 90% repolarization (APD 90 ) decreased more from baseline than in controls (−23.2% ± −5.1% vs. −2.1% ± −8.1%, P < 0 .0001), as did APD 30 (−28.8% ± −3.8% vs. −2.1% ± −2.1%, P < 0.0001). In vivo dose‐response study : Guinea pigs underwent intraperitoneal injections every 2 weeks in 1 of 4 groups (each n = 8): ZA 0.007 mg/kg (low‐dose), ZA 0.07 mg/kg (medium‐dose), ZA 0.7 mg/kg (high‐dose), or placebo. Hearts were excised at 8 weeks and perfused with modified K‐H. Atrial effective refractory period (ERP) was lower with medium‐ and high‐dose ZA versus placebo (P = 0.004). Atrial APD 30 was lower with high‐dose ZA versus placebo, low and medium doses (P < 0.001). Canine ECG study : Mature female beagles received intravenous ZA 0.067 mg/kg or saline (placebo; each n = 6) every 2 weeks for 12 weeks. P wave dispersion was greater in the ZA group (7.7 ± 3.7 vs. 3.4 ± 2.6 ms, P = 0.04). There were no significant differences in P wave index, maximum or minimum P wave duration, or PR interval. Conclusion ZA shortens left atrial APD and ERP and increases P wave dispersion.