Expert: doctornihil replied 6 years ago. Hi, The hypoplasia of A1 segment of the right anterior cerebral artery and of the P1 segment of the right posterior cerebral artery is a congenital variation ('birth defect'), which increases the chances of ischemic stroke (reduced blood circulation in the brain). Ask Your Own Medical Question.
Premature ventricular contractions (PVCs) are extra, abnormal heartbeats that begin in one of your heart's two lower pumping chambers (ventricles).These extra beats disrupt your regular heart rhythm, sometimes causing you to feel a flip-flop or skipped beat in your chest.remature ventricular contractions (PVCs) are extra, abnormal heartbeats that begin in one of your heart's two lower pumping chambers (ventricles).
Volatile organic compound. Volatile organic compounds (VOCs) are organic chemicals that have a high vapor pressure at ordinary room temperature. Their high vapor pressure results from a low boiling point, which causes large numbers of molecules to evaporate or sublimate from the liquid or solid form of the compound and enter the surrounding air, a trait known as volatility.