Dr. Tim Lahm is fellowship-trained pulmonologist and researcher who treats lung diseases such as pulmonary hypertension and lymphangioleiomyomatosis.

Dr. Lahm is a physician scientist in the Division of Pulmonary, Critical Care and Sleep Medicine with a focus on the study of sexual dimorphisms in lung vascular remodeling and right ventricular (RV) adaptation in pulmonary hypertension (PH).

In particular, he is interested in gender differences in PH and the role of sex hormones in PH and RV failure. His laboratory is studying mechanisms of how sex hormones such as 17β-estradiol affect lung and RV endothelial cell homeostasis as well as cardiomyocyte function during PH and RV failure development. A specific focus is on deciphering how estrogen receptor alpha promotes resilience to maladaptive RV remodeling by regulating angiogenesis, contractile signaling and inflammatory processes.

Other areas of interest in the Lahm lab include studies of hypoxia-induced lung vascular and RV remodeling in the perinatal period and throughout the lifespan, neurohormonal signaling in the RV, exercise effects on RV function, and novel PH phenotypes in the veteran population. The Lahm lab recently expanded its studies of sexually dimorphic lung diseases to study androgen signaling in asthma and to identify mechanisms of how androgens modulate airway epithelial cell function.

Research Areas

  • Sex hormone signaling in pulmonary hypertension (PH) and right ventricular (RV) failure
  • Androgen signaling in airway epithelial cells in severe asthma
  • Effects of perinatal hypoxia on lung and pulmonary vascular development and function later in life
  • Identification of novel PH phenotypes in veterans
  • Translational and clinical studies of hemodynamics, RV function and genetics in PH


  • Pulmonary Hypertension

Associate Professor, Division of Pulmonary, Critical Care, Sleep and Occupational Medicine, Department of Medicine, Indiana University School of Medicine

Adjunct Professor, Department of Anatomy, Cell Biology and Physiology, Indiana University School of Medicine

Professor, Division of Pulmonary Sciences and Critical Care Medicine, Department of Medicine, School of Medicine, University of Colorado-Anschutz Medical Campus

Rheumatology/Allergy, Pulmonary and Critical Care Medicine
MD, University of Heidelberg, Germany, 2000