Littmann Cardiology IV helps isolate subtle sounds so you can hear changes in your patients in the most critical and challenging environments. Designed to help you listen for hard-to-hear sounds, including aortic stenosis, S3 gallop murmurs and faint pulmonary anomalies. Useful in critical care and challenging environments such as the ED, ICU, Cardiac ICU, step-down unit and other dynamic locations Hear subtle changes in patient status. Diagnose and make decisions with confidence.