LISTEN WITH HEADPHONES. Recording made with a Thinklabs One Digital Stethoscope. Friction rub—rough low-frequency sound. Inspiratory predominant. Sounds like rubbing two pieces of leather together. Contributor: Doug Bails, MD; Kendrick Lopez, MD; and Michael Janjigian, MD, FACP; Division of General Medicine, Bellevue Hospital, New York University School of Medicine For more information, visit our website: www.thinklabs.com Copyright Notice: You may use sounds from this library with written permission from Thinklabs. We usually grant permission on condition that correct attribution is provided and you include a link to thinklabsmedical.com. Contact us for more information.