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A fast Respiratory Index (RI) calculation tool for medical professionals to assess lung oxygenation function.
Enter velocity data to calculate.
Pourcelot Formula: RI = (PSV - EDV) / PSV
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TripleDES Encrypt & Decrypt
Provides TripleDES encryption and decryption features, supporting common modes like CBC/ECB and PKCS padding to protect sensitive data.
JSON to TypeScript Converter
Automatically convert JSON data into TypeScript interfaces or type aliases for frontend data modeling and API integration.
Nutritional Risk Index (NRI) Calculator
Enter serum albumin, current weight, and usual weight to quickly calculate your NRI score, assess nutritional status, and identify malnutrition risk levels.
JavaScript Events Reference Table & Compatibility List
An online reference guide for front-end developers to quickly look up JavaScript event names, categories, and browser compatibility.
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When a patient experiences dyspnea, medical professionals need to quickly quantify and assess intrapulmonary shunting. The Respiratory Index (RI) objectively reflects the degree of pulmonary oxygenation dysfunction by calculating the ratio of the alveolar-arterial oxygen gradient (P(A-a)O₂) to the arterial oxygen partial pressure (PaO₂). The formula is RI = P(A-a)O₂ (mmHg) / PaO₂ (mmHg).
At what RI value is clinical intervention required?
An RI > 0.5 indicates severe intrapulmonary shunting and warrants immediate clinical evaluation.
Are the RI evaluation criteria different for patients in high-altitude areas?
Yes. For every 1,000 meters of elevation gain, the physiological PaO₂ value drops by 5-10 mmHg. It is recommended to interpret the results in conjunction with local clinical standards.
Ensure that PaO₂ is not zero. The results are for reference only. For patients with Acute Respiratory Distress Syndrome (ARDS), results should be combined with imaging studies. When performing batch calculations, it is recommended to record the FiO₂ parameters for each measurement.
Typical case example: For a COPD patient with a measured P(A-a)O₂ = 25 mmHg and PaO₂ = 50 mmHg, the calculated RI is 0.5. Combined with a history of chronic hypoxia, chronic ventilation/perfusion (V/Q) mismatch should be prioritized over acute pulmonary embolism.
