A Study to Analyze the Role of Sympathetic Nervous System in Spontaneous Coronary Artery Dissection

We will measure arterial stiffness using arterial tonometry.

We will collect limited ultrasound images of the heart.

We will perform ultrasound imaging of the carotid artery.

We will measure the elastic properties of the arteries using elastography.

We will measure the ankle-brachial index to assess peripheral artery blood flow.

We will measure sympathetic nerve activity at rest and in response to isometric handgrip, mental stress test, cold pressor test, Valsalva maneuvers.