Clinical Signs of Gigantism: Why Doctors Now Treat It as a Disability
The skeletal destruction caused by gigantism is obvious, but cardiovascular collapse remains its deadliest complication. Sustained growth hormone excess forces cardiac myocytes into hyper-proliferation. The heart enlarges asymmetrically, a condition known as cardiomegaly.
A larger heart does not yield greater circulatory performance. The myocardium becomes stiff, fibrotic, and unable to relax during diastole. Diastolic dysfunction quietly develops in early adulthood, sliding into concentric hypertrophy and eventual congestive heart failure. Pumping blood through a frame exceeding seven feet requires astronomical pressure, driving resistant hypertension in over 40% of diagnosed patients.
Metabolic exhaustion complicates the cardiovascular prognosis. IGF-1 and growth hormone operate as direct physiological antagonists to insulin. They block peripheral glucose uptake and trigger accelerated hepatic gluconeogenesis. Over 35% of adult patients develop secondary diabetes mellitus, accompanied by severe peripheral vascular disease and diabetic nephropathy. Sleep apnea occurs in nearly 70% of cases, triggered by massive soft-tissue enlargement in the tongue, pharynx, and upper airways. This nocturnal hypoxia places relentless overnight stress on an already failing right ventricle.
