The twang is a very fine, even rupture sound, like the sound you make when you twist a strand of hair around your ear with your fingers. Gas gangrene is a severe acute atopic infection caused by Clostridium perfringens. Depending on the extent of the lesion; Clostridium difficile infections are divided into two categories: Clostridium myonecrosis and and Clostridium cellulitis. What is commonly referred to as gas gangrene, or Clostridium myonecrosis, occurs mainly in patients with extensive muscle tissue damage and, rarely, in wounds following abdominal or perineal surgery. Pulmonary function tests Pulmonary function tests are one of the necessary tests for respiratory diseases, and are important for early detection of lung and airway lesions, assessment of the severity and prognosis of the disease, evaluation of the efficacy of drugs or other treatments, identification of the cause of dyspnea, diagnosis of the lesion site, assessment of the tolerance of lung function to surgery or labor intensity and monitoring of critically ill patients. Pulmonary examination Pulmonary examination is a complex examination with many items, such as pulmonary function tests, pulmonary capillary wedge pressure, bronchoscopy, etc. Pulmonary function test: Pulmonary function test includes ventilation function, ventilation function, respiratory regulation function and pulmonary circulation function, etc. There are many examination items and measurement indexes. It is especially important for smokers and people who work in highly polluted jobs to determine how well you can tolerate and what kind of work you can do. It is also very sensitive and does not cause any damage to the body. Pulmonary capillary wedge pressure: Pulmonary capillary wedge pressure is one of the most common and important indicators used in clinical hemodynamic monitoring. It is also known as pulmonary artery wedge pressure (PAWP). Pulmonary artery wedge pressure is usually measured by floating a Swan-Ganz balloon catheter through the bloodstream and wedging it into the small pulmonary artery, blocking the antegrade blood flow there, at which point the pressure measured at the tip of the catheter is the pulmonary artery wedge pressure (PAWP). Bronchoscopy: Bronchoscopy is an examination method that includes electronic bronchoscopy, pediatric bronchoscopy, and transbronchoscopic lung biopsy. Selective bronchoscopy is performed with the patient in a supine or semi-recumbent position, with intravenous access, intermittent blood pressure monitoring, and continuous oximetry and ECG monitoring. Fluoroscopy is not necessary but can be helpful in many cases. Color video imaging bronchoscopy is useful for visualization and allows photography of airway lesions. Pulmonary and pleural percussion Pulmonary and pleural percussion is based on the physical properties of the thorax and lung tissue, and the different sounds produced when percussion is performed to determine the presence and nature of lung pathology. The methods of percussion include direct percussion and indirect percussion. Indirect percussion is the commonly used percussion method. During percussion, the plate finger is placed flat in the intercostal space and parallel to the ribs; when percussing the interscapular region, the plate finger is parallel to the spine; the plate finger is often percussed vertically with the end of the middle finger of the right hand, and the percussion action is completed mainly by the movement of the wrist joint. The percussion should be fast and short, with moderate and even percussion force, and the right middle finger should be raised quickly after percussion, with 2 to 3 percussions each time.