Atrial tachycardia is a supraventricular tachycardia (SVT) that does not require the atrioventricular (AV) junction, accessory pathways, or ventricular tissue for its initiation and maintenance.
Page Content. Northern Natural Gas Company (Northern) is a subsidiary of Berkshire Hathaway Energy based in Omaha, Nebraska and has been in business since 1930. Northern owns and operates the largest interstate natural gas pipeline system in the United States.
Headquartered in London, National Grid PLC (NYSE: NGG) is a multinational electricity and gas utility company with principal activities in the United Kingdom and Northeastern United States. The company owns and maintains the high-voltage electricity transmission network in England and Wales.