Long covid linked to lasting heart and lung damage
Long-term COVID-19, often referred to as long COVID, is associated with persistent and sometimes progressive effects on both the cardiovascular and respiratory systems. Evidence shows that even after the acute infection resolves, underlying inflammation and vascular damage can continue to affect organ function for months or longer.
The cardiovascular system appears particularly vulnerable. Studies indicate that prior COVID-19 infection is linked to faster progression of coronary artery plaque, especially unstable forms that increase the risk of heart attacks. Ongoing endothelial dysfunction and inflammation contribute to arterial stiffness, raising the likelihood of hypertension, atherosclerosis, stroke, and other cardiovascular events.
Heart muscle complications are also reported. Some patients develop myocarditis, cardiomyopathy, or symptoms resembling heart failure months after infection. Imaging studies have found abnormalities in both left and right ventricular function, along with impaired relaxation of the heart, especially among individuals with long COVID symptoms.
There is also evidence of increased risk of blood clots and irregular heart rhythms. Research shows higher rates of thromboembolic events such as pulmonary embolism and deep vein thrombosis, even in patients who initially had mild illness. Persistent hypercoagulability and systemic inflammation appear to drive these complications. Cardiac arrhythmias have also been observed during long-term follow-up.
Respiratory effects are equally significant. Many patients, particularly those who experienced severe illness or acute respiratory distress syndrome, show lasting abnormalities on lung imaging. These include fibrotic-like changes and areas of inflammation. Lung function tests often reveal reduced capacity to transfer oxygen and lower overall lung volume, which can persist for a year or more.
These structural and functional changes contribute to symptoms such as shortness of breath, reduced exercise tolerance, and diminished quality of life. Cardiopulmonary testing shows that survivors may have impaired oxygen uptake and reduced peak physical performance, indicating that both heart and lung function remain compromised.
Chronic respiratory symptoms are also common among long COVID patients. Persistent cough, chest discomfort, and breathing difficulties can occur even in the absence of major visible lung damage, suggesting involvement of microvascular injury, inflammation, and nervous system dysfunction.
The interaction between cardiovascular and respiratory effects further complicates recovery. Ongoing inflammation and endothelial damage can impair blood flow in both systems, reducing oxygen delivery and creating a cycle of fatigue and exercise intolerance. Additional factors such as poor sleep, reduced physical conditioning, and anxiety can increase heart rate variability and blood pressure, placing further strain on the cardiovascular system.
Overall, long COVID represents a complex condition with lasting impacts on heart and lung health, highlighting the need for long-term monitoring and targeted rehabilitation strategies.
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