QT syndrome & Troponin levels
Long QT Syndrome is referring to the rythum on the EKG.
The long QT syndrome (LQTS) is a disorder of myocardial repolarization characterized by a prolonged QT interval on the electrocardiogram (ECG) (show ECG 1) [1-3] . This syndrome is associated with an increased risk of a characteristic life-threatening cardiac arrhythmia, known as torsade de pointes (TdP) (show ECG 2A-2B) [4,5] . The primary symptoms in patients with LQTS include palpitations, syncope, seizures, and sudden cardiac death (SCD).
Troponin is a cardiac emzyme - measured in a serum laboratory test.
Clinical evidence of myocardial ischemia is necessary because serum troponin elevations are not necessarily due to an acute coronary syndrome (ACS). They can also be seen in a variety of other diseases, such as sepsis, hypovolemia, atrial fibrillation, heart failure, pulmonary embolism, myocarditis, myocardial contusion, and renal failure.
Criteria required to meet the definition include symptoms of ischemia, the use of laboratory tests (including cardiac biomarkers such as troponin, ECG, or specific imaging abnormalities), or pathologic findings. The criteria used to define myocardial infarction differ somewhat depending on the particular clinical circumstance of the patient: those suspected of acute MI based on their presentation; those undergoing either coronary artery bypass graft surgery or percutaneous intervention; or those who have sustained sudden unexpected, cardiac death (show table 1).