Hypertrophy – Causes, Symptoms & Treatment
Hypertrophy refers to the enlargement of an organ or tissue due to an increase in cell size. It can be physiological or pathological.
Things worth knowing about "Hypertrophy"
Hypertrophy refers to the enlargement of an organ or tissue due to an increase in cell size. It can be physiological or pathological.
What is Hypertrophy?
Hypertrophy is defined as the enlargement of an organ, tissue, or individual cells caused by an increase in cell size – not by an increase in cell number. An increase in cell number is called hyperplasia and must be distinguished from hypertrophy. Hypertrophy can represent either a normal, beneficial adaptive response of the body or a sign of pathological change.
Causes
The causes of hypertrophy can generally be divided into physiological (normal) and pathological (disease-related) forms:
- Physiological hypertrophy: Occurs as an adaptation to increased demand, for example muscle growth from regular strength training or enlargement of the uterus during pregnancy.
- Pathological hypertrophy: Develops as a consequence of disease, for example cardiac muscle hypertrophy caused by high blood pressure (arterial hypertension), aortic valve stenosis, or genetically inherited heart conditions.
- Compensatory hypertrophy: An organ enlarges to compensate for the loss of function of another organ or part of an organ, for example kidney hypertrophy after removal of one kidney.
- Hormone-induced hypertrophy: Certain hormones such as growth hormone, testosterone, or thyroid hormones can stimulate the growth of specific tissues.
Common Forms of Hypertrophy
Muscle Hypertrophy
Muscle hypertrophy is the most well-known form and refers to the enlargement of muscle cells (muscle fibers) in response to mechanical load, such as resistance training. The increased synthesis of muscle proteins such as actin and myosin leads to a greater cross-sectional area of the muscle.
Cardiac Hypertrophy
When the heart is subjected to persistently elevated pressure – for example due to high blood pressure or heart valve disease – the heart muscle responds by thickening its walls. Two main types are distinguished:
- Concentric hypertrophy: The heart wall thickens while the inner chamber (lumen) remains the same size or becomes smaller. Typically seen in pressure overload (e.g., hypertension).
- Eccentric hypertrophy: The inner chamber expands and the wall becomes thinner. Typically seen in volume overload (e.g., heart failure).
Prostatic Hypertrophy
Benign prostatic hyperplasia (BPH) is commonly referred to as prostatic hypertrophy in everyday language, although strictly speaking it involves cell multiplication (hyperplasia). It frequently affects older men and can cause urinary symptoms.
Thyroid Hypertrophy
Enlargement of the thyroid gland, also called a goiter, can be caused by iodine deficiency, autoimmune diseases, or thyroid nodules.
Symptoms
Symptoms vary greatly depending on the affected structure:
- Cardiac hypertrophy: Shortness of breath, dizziness, palpitations, increased risk of arrhythmias and heart failure.
- Muscle hypertrophy: Generally no symptoms; it is typically a desired outcome of athletic training.
- Prostatic hypertrophy: Weak urine stream, frequent urge to urinate, incomplete bladder emptying.
- Thyroid hypertrophy: Visible or palpable swelling in the neck, difficulty swallowing, feeling of tightness in the throat.
Diagnosis
The diagnostic approach depends on the organ affected:
- Cardiac hypertrophy: ECG, echocardiography (cardiac ultrasound), cardiac MRI.
- Muscle hypertrophy: Physical examination, ultrasound, MRI.
- Prostate: Ultrasound, digital rectal examination, PSA blood test.
- Thyroid: Ultrasound, thyroid blood tests (TSH, T3, T4), scintigraphy.
Treatment
Treatment depends on the underlying cause and the organ involved:
- Cardiac hypertrophy: Treatment of the underlying condition (e.g., blood pressure reduction with medications such as ACE inhibitors or beta-blockers); surgical intervention in severe cases.
- Prostatic hypertrophy: Medications (alpha-blockers, 5-alpha-reductase inhibitors), minimally invasive procedures, or surgery.
- Thyroid hypertrophy: Iodine supplementation, thyroid hormone therapy, radioiodine therapy, or surgery depending on the cause.
- Muscle hypertrophy: Generally no treatment required; if caused by substance misuse, addressing the root cause is necessary.
References
- Kumar V., Abbas A.K., Aster J.C.: Robbins & Cotran Pathologic Basis of Disease. 10th Edition. Elsevier, Philadelphia 2020.
- Silbernagl S., Lang F.: Color Atlas of Pathophysiology. 3rd Edition. Georg Thieme Verlag, Stuttgart 2016.
- World Health Organization (WHO): Cardiovascular diseases (CVDs) Fact Sheet. Geneva 2021. Available at: https://www.who.int/news-room/fact-sheets/detail/cardiovascular-diseases-(cvds)
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