Determination of the pressure of gas components in the pleural cavity

The measurement of the gas component pressure in the pleural cavity is an examination method that helps to identify whether the rupture port is closed. Gases in the pleural cavity are usually extracted for analysis. If PO2>6.67 kPa (50 mmHg) and PCO2<5.33 kPa (40 mmHg), persistent bronchopleural palsy should be suspected; otherwise, PO2<5.33 kPa (40 mmHg) and PCO2>6 kPa ( 45mmHg), suggesting that the bronchopleural fistula has healed. Basic Information Specialist Category: Respiratory Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Tips: Pay attention to normal eating habits and pay attention to personal hygiene. Normal value The closed chest pectoral PO2 <5.33 kPa (40 mmHg) and PCO2 often >5.33 kPa (40 mmHg), and its PCO2/PO2 are >1. Patients with open pneumothorax often have a PO2 of >13.33 kPa (100 mmHg) and a PCO2 of <5.33 kPa (40 mmHg) with a PCO2/PO2 of <1. Patients with tension pneumothorax often have a PO2 of >5.33 kPa (40 mmHg) and a PCO2 of <5.33 kPa (40 mmHg). The normal state PO2 < 5.33 kPa (40 mmHg) and PCO2 > 6 kPa (45 mmHg). Clinical significance Gases in the pleural cavity are usually extracted for analysis. If PO2>6.67 kPa (50 mmHg) and PCO2<5.33 kPa (40 mmHg), persistent bronchopleural palsy should be suspected; otherwise, PO2<5.33 kPa (40 mmHg) and PCO2>6 kPa ( 45mmHg), suggesting that the bronchopleural fistula has healed. Abnormal results Pneumothorax patients often show high mental tension, fear, irritability, shortness of breath, suffocation, cyanosis, sweating, and pulse shock and rapid, blood pressure, skin cold and other shock states, and even unconscious, coma. Patients who need to be examined for abnormal symptoms of pneumothorax caused by tension pneumothorax, traumatic pneumothorax, and menstrual pneumothorax. Precautions Forbidden before examination: Pay attention to normal eating habits and pay attention to personal hygiene. Requirements for inspection: Actively cooperate with the doctor. Inspection process Analysis of the pleural gas in patients with spontaneous pneumothorax confirmed that the intrathoracic PO2 of the closed pneumothorax was <5.33 kPa (40 mmHg) and the PCO2 was often >5.33 kPa (40 mmHg), while the PCO2/PO2 was >1. Patients with open pneumothorax have persistent bronchial pleural fistula, and there is traffic between the thoracic gas and alveolar gas. Therefore, PO2 is often >13.33 kPa (100 mmHg), while PCO2 is <5.33 kPa (40 mmHg), and PCO2/PO2 is <1. Patients with tension pneumothorax continue to enter the pleural cavity due to gas. Therefore, PO2 is often >5.33 kPa (40 mmHg) and PCO2 is <5.33 kPa (40 mmHg). If the patient's PaCO2 is higher, the PCO2 of the pleural cavity gas will increase accordingly, and the PCO2/PO2 ratio must be >0.4, but <1. Therefore, the combined application of three factors of chest gas PO2, PCO2 and PCO2/PO2 ratio is of great significance for judging the type of pneumothorax. Not suitable for the crowd Inappropriate crowd: No.