GC: n

S: https://www.nlm.nih.gov/medlineplus/ency/article/003419.htm (last access: 21 September 2015); http://www.webmd.com/heart-disease/cardiac-catheterization (last access: 21 September 2015).

N: 1. cardiac (adj): c. 1600, from French cardiaque (14c.) or directly from Latin cardiacus, from Greek kardiakos “pertaining to the heart,” from kardia “heart,” from PIE root *kerd- “heart”. Cardiac arrest is attested from 1950.
Greek kardia also could mean “stomach” and Latin cardiacus “pertaining to the stomach.” This terminology continues somewhat in modern medicine. Confusion of heart and nearby digestive organs also is reflected in Breton kalon “heart,” from Old French cauldun “bowels,” and English heartburn for “indigestion.”
catheterization (n): From catheter, c. 1600, from French cathéter, from Late Latin catheter “a catheter,” from Greek katheter “surgical catheter,” literally “anything let down,” from stem of kathienai “to let down, thrust in,” from kata “down” + stem of hienai “to send”. Earlier was cathirum (early 15c.), directly from Medieval Latin. Related: Catheterization; catheterized; catheterizing.
2. Cardiac catheterization (KATH-eh-ter-ih-ZA-shun) is a medical procedure used to diagnose and treat some heart conditions.
A long, thin, flexible tube called a catheter is put into a blood vessel in your arm, groin (upper thigh), or neck and threaded to your heart. Through the catheter, your doctor can do diagnostic tests and treatments on your heart.

S: 1. OED – http://www.etymonline.com/index.php?term=cardiac; http://www.etymonline.com/index.php?term=catheter (last access: 21 September 2015). 2. http://www.nhlbi.nih.gov/health/health-topics/topics/cath (last access: 21 September 2015).

SYN:
S:

CR: catheter, catheterization, stent.