Biomaterial Database

Wedge pressure confirmation by aspiration of pulmonary capillary blood. 1985

A H Morris, and R H Chapman

In order to define the contribution of wedge blood composition to pulmonary artery wedge pressure (WP) measurement, we made 28 comparisons of WP and left atrial pressure (LAP) in 16 stable patients with pulmonary or cardiac failure after cardiac surgery. All technical problems associated with initial WP measurements were eliminated before simultaneously recording WP and LAP. Wedge blood samples (w), withdrawn from the distal pulmonary artery catheter port in the balloon occlusion position, were compared with paired arterial (a) blood samples. Wedge blood was defined as pulmonary capillary blood when the following three wedge-arterial gradient criteria were satisfied: (PwO2 - PaO2) greater than or equal to 19 torr; (PaCO2 - PwCO2) greater than or equal to 11 torr; and (pHw-pHa) greater than or equal to 0.08. When capillary blood was withdrawn from the wedge position, there was no difference between WP and LAP measurements. When wedge blood failed to satisfy capillary criteria, WP was significantly (p less than .05) different from LAP. Aspiration of capillary blood from the wedge position in ICU patients confirms that WP faithfully reflects LAP. It identifies those differences between WP and LAP which remain after technical problems are eliminated.

UI	MeSH Term	Description	Entries
D007362	Intensive Care Units	Hospital units providing continuous surveillance and care to acutely ill patients.	ICU Intensive Care Units,Intensive Care Unit,Unit, Intensive Care
D010100	Oxygen	An element with atomic symbol O, atomic number 8, and atomic weight [15.99903; 15.99977]. It is the most abundant element on earth and essential for respiration.	Dioxygen,Oxygen-16,Oxygen 16
D011184	Postoperative Period	The period following a surgical operation.	Period, Postoperative,Periods, Postoperative,Postoperative Periods
D011446	Prospective Studies	Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group.	Prospective Study,Studies, Prospective,Study, Prospective
D011669	Pulmonary Wedge Pressure	The blood pressure as recorded after wedging a CATHETER in a small PULMONARY ARTERY; believed to reflect the PRESSURE in the pulmonary CAPILLARIES.	Pulmonary Artery Wedge Pressure,Pulmonary Capillary Wedge Pressure,Pulmonary Venous Wedge Pressure,Wedge Pressure,Pressure, Pulmonary Wedge,Pressures, Pulmonary Wedge,Pulmonary Wedge Pressures,Wedge Pressure, Pulmonary,Wedge Pressures, Pulmonary,Pressure, Wedge,Pressures, Wedge,Wedge Pressures
D002196	Capillaries	The minute vessels that connect arterioles and venules.	Capillary Beds,Sinusoidal Beds,Sinusoids,Bed, Sinusoidal,Beds, Sinusoidal,Capillary,Capillary Bed,Sinusoid,Sinusoidal Bed
D002245	Carbon Dioxide	A colorless, odorless gas that can be formed by the body and is necessary for the respiration cycle of plants and animals.	Carbonic Anhydride,Anhydride, Carbonic,Dioxide, Carbon
D006348	Cardiac Surgical Procedures	Surgery performed on the heart.	Cardiac Surgical Procedure,Heart Surgical Procedure,Heart Surgical Procedures,Procedure, Cardiac Surgical,Procedure, Heart Surgical,Procedures, Cardiac Surgical,Procedures, Heart Surgical,Surgical Procedure, Cardiac,Surgical Procedure, Heart,Surgical Procedures, Cardiac,Surgical Procedures, Heart
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D006863	Hydrogen-Ion Concentration	The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH	pH,Concentration, Hydrogen-Ion,Concentrations, Hydrogen-Ion,Hydrogen Ion Concentration,Hydrogen-Ion Concentrations