Why does the heart pump less efficiently after a heart attack?

After a heart attack, damage to the heart muscle occurs due to reduced blood flow, leading to the death of muscle cells. This damage can result in scar tissue formation, which does not contract or function like healthy muscle. Consequently, the heart's ability to pump blood effectively is compromised, leading to decreased cardiac output and overall efficiency. Additionally, the heart may face increased workload and strain, further impacting its pumping capability.