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.
NuStar Energy LP said late Tuesday it had agreed to buy midstream operator Navigator Energy Services LLC for $1.48 billion. Navigator owns and operates crude-oil transportation, pipeline gathering, and storage assets located in West Texas' Permian Basin.