Atoms can join together to form molecules, which in turn form most of the objects around you. Atoms are composed of particles called protons, electrons and neutrons. Protons carry a positive electrical charge, electrons carry a negative electrical charge and neutrons carry no electrical charge at all. The protons and neutrons cluster together in the central part of the atom, called the nucleus, and the electrons 'orbit' the nucleus.
Practice Essentials. Percutaneous coronary intervention (PCI), also known as coronary angioplasty, is a nonsurgical technique for treating obstructive coronary artery disease, including unstable angina, acute myocardial infarction (MI), and multivessel coronary artery disease (CAD). See the image below.
A patient controlled analgesia (PCA) is a generic term which refers to a method allowing a. person in pain to deliver their own pain relief. The PCA is used for the more continuous. control of moderate to severe pain, where oral or intermittent analgesia would be less. effective. The intravenous route is referred to as PCIA in this document, as opposed to the. epidural route, referred to as patient controlled epidural analgesia (PCEA).