![]() Several diseases and conditions can cause lung crackles, including: “My lungs snap, crackle, and pop like Rice Krispies,” said one myPHteam member. Crackles are produced when closed portions suddenly open and allow air flow. In pulmonary fibrosis, there is scarring and thickening of the lung tissues. You may feel shortness of breath or like you are suffocating or drowning, especially when lying down.Ĭrackles may also be produced without fluid in the lungs. You may feel like you are running out of air, a condition called dyspnea. ![]() ![]() When lung crackles are caused by fluid in the lungs, you may experience symptoms similar to those of pulmonary edema, a condition caused by excess fluid in the lungs. When you breathe in, those liquid blockages or plugs rupture, creating a popping or bubbling noise as the air pushes through. Liquid blockages in small airways can make that sound. The.Lung crackles may indicate fluid in the lungs. Lung sounds were recorded in 11 patients with pneumonia in all of them crackling lung sounds could be heard on pulmonary auscultation. In addition, the question was whether the frequency and waveform of the pneumonic crackles and their timing within the respiratory cycle change during the clinical course of pneumonia when the patient is recovering from the pneumonic process. The aim of this study was to document the lung sound crackles in pneumonia and to analyze the recorded auscultatory findings with phonopneumography, time-expanded waveform analysis, and FFT spectrum analysis. Because of the changing character of pneumonic consolidation we did not include the pneumonic patients in that study. We previously have analyzed lung sound crackles in 40 patients representing four different diseases (fibrosing alveolitis, bronchiectasis, COPD, and heart failure), and significant differences were found between them in lung sound analysis. There are, however, surprisingly few reports about analysis of crackles in pneumonia, actually only some preliminary reports. Since the 1960, inspired by Forgacs' theory of crackle genesis as a sudden opening of closed airways, several studies on the crackle timing, waveform, and frequency have been carried out in various pulmonary diseases. McGehee and McKusick cite Osler's, description of the crackles in the early stages of pneumonia as fine crackles according to him crackles of all sizes occurred in resolving pneumonia. Forgacs characterized the pneumonic crackles as late inspiratory crackles resembling the crackles in fibrosing alveolitis. "subcrepitant rales," which were especially important in the diagnosis of tuberculous pneumonia. Contrary to that, Pratt and Bushnell described the crackles in pneumonia to be at first small "crepitant rales" followed in the evolution of pneumonia by somewhat coarser moist crackles. The crackles in pulmonary edema have been considered or documented to be coarse. According to him, similar crackles were heard in pulmonary edema and hemoptysis. Laennec described the adventitious sounds of pneumonia as resembling crepitation of solid salts in a heated vessel. (Chest 1992 102:176-83) FFT = fast Fourier transformĬrackles are short explosive sounds heard in lung auscultation in several diseases, and their characteristics vary depending on the pathophysiology of the disease. The duration of the individual crackles became shorter and the timing of the crackles shifted toward the end of inspiration. The results indicate that the pneumonia crackles vary markedly during the clinical course of pneumonia. The largest deflection width of the individual crackles became shorter (p<0.05). In the sound recording, the beginning of crackling had shifted later (p<0.01) and the end point of crackling also became later (p<0.05). ![]() The patients with unilateral pneumonia had a significant difference in the upper frequency limit of inspiratory sound of the FFT spectrum between the healthy and diseased lung (p<0.01). ![]() In the first recording the crackles were coarse and midinspiratory. The sounds were recorded on average six days after the onset of pneumonia and the recording was repeated two to four days later. Recorded crackling lung sounds of 11 patients with pneumonia were studied with phonopneumography, FFT spectrography and time-expanded waveform display. ![]()
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