![]() ![]() Stridor refers to a high-pitched harsh sound heard during inspiration. Visit EMTprep LungSoundSeries Pleural Rub Sounds If the rubbing sound continues, its a pericardial friction rub because the inflamed pericardial layers continue rubbing together with each heart beat - a pleural rub stops when breathing stops. To determine whether the sound is a pleural friction rub or a pericardial friction rub, ask the patient to hold his breath briefly. More often heard on inspiration than expiration, the pleural friction rub is easy to confuse with a pericardial friction rub. Pleural friction rubs are low-pitched, grating, or creaking sounds that occur when inflamed pleural surfaces rub together during respiration.
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