Final answer:
An MI involving the right marginal artery affects the right ventricle and changes are seen on the inferior leads (II, III, aVF) on an ECG. Complications include arrhythmias, heart failure, and cardiac arrest. Cardiac biomarkers like creatine kinase MB and cardiac troponin are elevated during an MI.
Step-by-step explanation:
An myocardial infarction (MI), commonly known as a heart attack, occurs when there is ischemia to the myocardial tissue due to blocked blood flow. When this involves the right marginal artery, it impacts the myocardium it supplies, mainly affecting the superficial portions of the right ventricle.
The electrocardiogram (ECG) leads that typically show changes in an MI involving the right marginal artery are inferior leads (II, III, and aVF), reflecting ischemia in the inferior part of the heart.
The complications of an MI can include arrhythmias, heart failure, and cardiac arrest due to the permanent damage to the heart muscle. Such damage is indicated by elevated levels of cardiac biomarkers such as creatine kinase MB and cardiac troponin in blood tests, and changes in the ECG readings, particularly in the ST and Q components.