TY - JOUR TI - The acute effect of bi-level positive airway pressure on heart rate variability in chronic obstructive pulmonary disease patients with hypercapnic respiratory failure AU - Yazıcı, M. AU - Uzun, K. AU - Ülgen, M.S. AU - Teke, T. AU - Maden, E. AU - Kayrak, M. AU - Turan, Y. AU - Arı, H. JO - The Anatolian Journal of Cardiology PY - 2008 VL - 8 SP - 426 EP - 430 DO - ER -