As a medical professional with expertise in cardiology, I can provide you with an overview of the factors that can lead to elevated T waves on an electrocardiogram (ECG). Elevated T waves, also known as tall or peaked T waves, are a common finding on ECGs and can be caused by a variety of conditions. Here are some of the potential causes: 1. Electrolyte Imbalances: Abnormal levels of electrolytes such as potassium (hyperkalemia) can cause tall, peaked T waves. Conversely, low levels of potassium (hypokalemia) can lead to low amplitude or inverted T waves. 2. Ischemia: Reduced blood flow to the heart muscle can result in changes to the T wave, including inversion or a decrease in amplitude. 3. Acute Myocardial Infarction (AMI): During an AMI, or heart attack, T waves can become elevated, especially in the early stages. 4. Early Repolarization Syndrome: This is a benign condition that can cause T wave elevation in a pattern that is usually seen in young individuals without heart disease. 5. Hyperthyroidism: An overactive thyroid can also lead to changes in the T wave. 6. Drugs and Toxins: Certain medications and toxins can affect the ECG, including those that affect the heart's electrical activity. 7. Hypoxia: Low oxygen levels in the blood can alter the T wave appearance. 8. Positional Changes and Breathing: As you mentioned, non-specific factors such as hyperventilation, anxiety, and positional changes can also cause T wave changes. It's important to note that T wave changes are non-specific and can be influenced by a wide range of factors. A thorough medical evaluation, including a review of the patient's history, physical examination, and additional diagnostic tests, is necessary to determine the underlying cause. read more >>

In general, T wave changes are very non-specific. They can occur with hyperventilation, anxiety, drinking hot or cold beverages, and positional changes. ... Hyperkalemia (hyperpotassemia) can cause tall, peaked T waves. Hypokalemia and ischemia can cause low amplitude or inverted T waves.read more >>