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.
In 2000, Mallon Oil Company won a 20-year concession for exploration and production of oil and natural gas in northern Costa Rica, but some 200 court appeals have until now blocked the concession.n 2000, Mallon Oil Company won a 20-year concession for exploration and production of oil and natural gas in northern Costa Rica, but some 200 court appeals have until now blocked the concession.