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Begg, G. A., Gierula, J., Waldron, Z. L., & Witte, K. K. (n.d.). 154 Patients receiving standard pacemaker generator replacements frequently have impaired left ventricular function and exercise intolerance, related to the percentage of right ventricular pacing. Heart, 97, A86. http://access.bl.uk/ark:/81055/vdc_100136719754.0x000016