A 65-year-old man has an over 17 year-long history of chronic obstructive bronchitis. He complains of dyspnea with difficult inspiration, heaviness in his right subcostal region, and edema of feet and shins. Auscultation detects rough respiration and dry crackles over the lungs, and an accentuated split second heart sound in the second intercostal region. What changes can be expected on the ECG?