- Heart conditions such as myocarditis, supraventricular tachycardia or coronary artery spasm.
- Pulmonary hypertension, kidney disease or pulmonary embolism.
Certain medical procedures such as open heart surgery, cardiac angioplasty, electrical cardioversion or radiofrequency ablation of the heart could also elevate the levels of these proteins.
- Elevated levels of troponin can be detected within four hours of the heart muscle injury.
- Whenever doctors suspect the patient to be having a heart attack, this test is carried out several times in the next 15-16 hours.
- For someone who has just had a heart attack, troponin levels are bound to stay high for a couple of weeks. Thus, this test can help the cardiologists zero in on the most suitable treatment option.
- If the levels normalize within 12 hours from the time when one started experiencing chest pain, the chances of one having a heart attack are quite less.
- High levels must be taken as a warning sign for future heart problems. One must make certain lifestyle-related changes and seek medical advice to lower the risk of heart disease.
- TnC binds to calcium ions to bring about changes in TnI. TnT attaches to a protein called tropomyosin to form the troponin-tropomyocin complex that lies within the grooves of actin filaments.
- It is TnI that attaches to actin in thin filaments in muscle cells and helps in anchoring the actin-tropomyocin complex. Whenever calcium ions flow into the cytoplasm and move towards the actin and myosin filaments, they attach themselves to troponin-tropomyocin molecules. This brings about a change in the shape of troponin which in turn causes tropomyosin to move out from its place.
- Once actin-myosin binding sites become exposed, actin and myosin interact with each other. This causes the muscle to contract. When calcium ions are not present in the cytoplasm, troponin takes its normal shape. Since myosin and actin cannot interact due to the non-availability of the actin-myosin binding sites, the muscle relaxes.
Cardiologists can determine the condition of the heart of the patient by testing the levels of troponin. This provides them with useful prognostic information. Since persistently high levels of TnI and TnT are indicative of future health risks, people who have elevated levels must make changes to their lifestyle and follow the advice of their doctor to stay healthy.