Non ischaemic chest pain is caused by:
**Core Concept**
Non-ischaemic chest pain is a type of chest discomfort that is not caused by coronary artery disease or myocardial infarction. It is a common condition that can be triggered by various factors, including gastroesophageal reflux disease (GERD), anxiety, and musculoskeletal disorders.
**Why the Correct Answer is Right**
Non-ischaemic chest pain is often attributed to the activation of the vagus nerve, which can stimulate the esophagus and lead to symptoms of GERD. The vagus nerve is a key component of the parasympathetic nervous system and plays a crucial role in regulating various bodily functions, including heart rate and digestion. In the context of GERD, the vagus nerve can cause the lower esophageal sphincter to relax, allowing stomach acid to flow back up into the esophagus and trigger symptoms of chest pain.
**Why Each Wrong Option is Incorrect**
**Option A:** While anxiety can certainly contribute to non-ischaemic chest pain, it is not the primary cause. Anxiety can exacerbate symptoms of GERD and other conditions, but it is not a direct cause of chest pain.
**Option B:** Musculoskeletal disorders can cause chest pain, but they are not the primary cause of non-ischaemic chest pain. Conditions such as costochondritis or intercostal muscle strain can cause chest pain, but they are typically localized to a specific area and do not have the same diffuse, burning quality as GERD-induced chest pain.
**Option C:** Coronary artery disease is a common cause of ischaemic chest pain, not non-ischaemic chest pain. While coronary artery disease can cause chest pain, it is typically accompanied by other symptoms such as shortness of breath, sweating, and a sense of impending doom.
**Clinical Pearl / High-Yield Fact**
When evaluating patients with non-ischaemic chest pain, it is essential to consider the role of the vagus nerve and the potential for GERD to contribute to symptoms. A simple test such as a pH probe can help diagnose GERD and guide treatment.
**Correct Answer: D. Gastroesophageal reflux disease (GERD)**