*8.3.1 Coronary artery diseases (CADs)*

Coronary artery disease (CAD) or coronary heart disease (CHD) is one of the most pervasive forms of CVD which is considered to be the preeminent cause of mortality in both first-world and third-world countries [28]. According to the estimation from a study, CAD accounts for 32.7% of overall CVDs and 2.2% of the total burden of maladies worldwide [29]. CAD is an inflammatory atherosclerotic disease [27]. It is a multifarious human disorder in which there is an insufficient transmission of oxygen and blood to the cardiac muscle, resulting from a blockage of the coronary arteries. It is often characterized by plaque deposition within the lumens of coronary arteries, which obstruct blood flow [30]. Hence CADs are linked to impaired circulation to the heart via the coronary artery. There are various forms of CAD. Among these are:

	- Stable or typical angina
	- Prinzmetal's variant angina and
	- Unstable or crescendo angina.

A brief description of each type is given below:

*Perspective Chapter: Physiology and Pathology of the Cardiovascular System DOI: http://dx.doi.org/10.5772/intechopen.108355*

