left atrial appendageatrial premature depolarizationatrial fibrillation anticoagulationheart atrial fibrillation treatmentpremature atrial complexleft atrial appendage surgeryleft atrial appendage closureatrial tachycardia vs afibpulmonary fibrosis specialistspulmonary fibrosis foundationofev pulmonary fibrosisasbestos and pulmonary fibrosis