Pneumology and Respiratory

Oxygen A--a Gradient Calculator

Physiological Dead Space Calculator

Pulmonary Vascular Resistance (PVR) Calculator

Pneumonia Severity Index (PSI / PORT)Twenty variables that divide community-acquired pneumonia into five risk classes. It is…

BODE Prognostic Index in COPDFour domains—obstruction, dyspnea, exercise capacity, and nutritional status—predict COPD…

STOP-BANG Questionnaire for Obstructive Sleep ApneaEight yes or no questions that screen for sleep apnea before surgery or resistant…

Light's Criteria for Pleural EffusionThey separate exudate from transudate, which is the first fork in the diagnosis of any…

Berlin Definition of Acute Respiratory Distress SyndromeGrades the distress by the PaO₂/FiO₂ ratio measured with at least 5 cmH₂O of positive…

ROX Index for High Flow Nasal CannulaA single number that predicts whether high flow will work: ratio between saturation…

Interpretation of Spirometry and Bronchodilator TestDetermines the ventilatory pattern, grades its severity according to ATS/ERS and…

GOLD Classification of COPD: Spirometric Grade and ABE GroupSince the 2023 review, there are three groups, not four: the old group C disappeared and…

PERC Pulmonary Embolism Exclusion RuleEight criteria that, all negative and only in the patient with low clinical probability,…

Alveolar Gas and Expected PaO₂, Corrected for Age and AltitudeThe alveolar gas equation stops working as soon as the patient is not at sea level: in…

DLCO Corrected by Hemoglobin and KCO CoefficientA low DLCO in an anemic patient may just be anemia. The Cotes correction, recommended by…

Maximum Expiratory Flow: Variability, Zones and Predicted ValueThe diurnal variability of peak expiratory flow is a diagnostic criterion for asthma in…

6 Minute Walk Test: Predicted Distance and DesaturationWithout a reference value, the distance traveled says nothing. The Enright and Sherrill…