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Early changes in rat hearts with developing pulmonary arterial hypertension can be detected with three-dimensional electrocardiography

¹Department of Cardiology, Leiden University Medical Center, Leiden; and ²Departments of Physiology and Pulmonology, VU University Medical Center, Amsterdam, The Netherlands

Submitted 13 December 2006 ; accepted in final form 11 May 2007

The study aim was to assess three-dimensional electrocardiogram (ECG) changes during development of pulmonary arterial hypertension (PAH). PAH was induced in male Wistar rats (n = 23) using monocrotaline (MCT; 40 mg/kg sc). Untreated healthy rats served as controls (n = 5). ECGs were recorded with an orthogonal three-lead system on days 0, 14, and 25 and analyzed with dedicated computer software. In addition, left ventricular (LV)-to-right ventricular (RV) fractional shortening ratio was determined using echocardiography. Invasively measured RV systolic pressure was 49 (SD 10) mmHg on day 14 and 64 (SD 10) mmHg on day 25 vs. 25 (SD 2) mmHg in controls (both P < 0.001). Baseline ECGs of controls and MCT rats were similar, and ECGs of controls did not change over time. In MCT rats, ECG changes were already present on day 14 but more explicit on day 25: increased RV electromotive forces decreased mean QRS-vector magnitude and changed QRS-axis orientation. Important changes in action potential duration distribution and repolarization sequence were reflected by a decreased spatial ventricular gradient magnitude and increased QRS-T spatial angle. On day 25, LV-to-RV fractional shortening ratio was increased, and RV hypertrophy was found, but not on day 14. In conclusion, developing PAH is characterized by early ECG changes preceding RV hypertrophy, whereas severe PAH is marked by profound ECG changes associated with anatomical and functional changes in the RV. Three-dimensional ECG analysis appears to be very sensitive to early changes in RV afterload.

right ventricular hypertrophy; monocrotaline; electrocardiogram

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				I. R. Henkens, K. T. B. Mouchaers, A. Vonk-Noordegraaf, A. Boonstra, C. A. Swenne, A. C. Maan, S.-C. Man, J. W. R. Twisk, E. E. van der Wall, M. J. Schalij, et al. Improved ECG detection of presence and severity of right ventricular pressure load validated with cardiac magnetic resonance imaging Am J Physiol Heart Circ Physiol, May 1, 2008; 294(5): H2150 - H2157. [Abstract] [Full Text] [PDF]