extravascular

Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.

Related to extravascular: extravascular fluid

extravascular

[ek″strah-vas´ku-ler]

situated or occurring outside a vessel or the vessels.

ex·tra·vas·cu·lar

(eks'tră-vas'kyū-lăr),

Outside the blood vessels or lymphatics or of any special blood vessel.

Farlex Partner Medical Dictionary © Farlex 2012

extravascular

(ĕk′strə-văs′kyə-lər)

adj.

1. Located or occurring outside a blood or lymph vessel.

2. Lacking vessels; nonvascular.

hemoglobinuria

Hematology The presence of Hb in the urine which, if of sufficient quantity, colors urine, the intensity of which directly correlates with the quantity of Hb. See Paroxysmal cold hemoglobinuria, Paroxysmal nocturnal hemoglobinuria.

hemolysis Destruction or lysis of RBCs

Hemolysis

Intracorpuscular hemolysis

• Membrane defects, eg hereditary elliptocytosis, spherocytosis, stomatocytosis and paroxysmal nocturnal hemoglobinuria

• Metabolic defects, eg G6PD, pyruvate kinase deficiency

• Abnormal Hbs see Hemoglobin.

Extracorpuscular hemolysis

1º immune reactions, eg autoimmune hemolytic anemia

2º immune reactions, due to

• Infections, eg Bartonella, Clostridia, malaria, sepsis

• Neoplasia, eg lymphoma, leukemias

• Drug reactions due to the 'Innocent bystander' phenomenon (drug-antibody complex activates complement, causing intravascular hemolysis, eg quinidine), hapten-mediated —a protein-bound drug attaches to the red cell membrane, eliciting an immune response when the hapten-protein complex is recognized as foreign, evoking an immune response, eg penicillin acting as a hapten

• Induction of autoimmunity by RBC antigen alterations, eg Rh antigen

Physical, eg thermal, concentrated glycerol due to inadequate washing of frozen blood, bladder irrigation, cardiac valves

Extravascular Less severe, IgG-mediated and does not activate complement, eg Rh, Kell, Duffy Laboratory ↓ haptoglobin, ↓ T_1/2 of circulating RBCs, ↑ indirect BR as liver capacity to conjugate BR–ergo direct BR is overwhelmed by massive hemolysis, ↑ LDH, Hb in blood and urine, hemosiderinuria, MetHb and metalbumin, ↑ urobilinogen in urine and feces, ↑ in acid phosphatase, K+, and prostatic acid phosphatase Clin Chem 1992; 38:575; peripheral smears demonstrate anisocytosis, polychromatophilia, nucleated RBCs, basophilic stippling; immune hemolysis is suggested by spherocytes NEJM 2000; 342:722cpc

Intravascular More severe, IgM-mediated and requires complement activation, eg ABO blood groups Laboratory ↑ free Hb Note: Clinically significant hemolysis is usually detected by hemagglutination, less commonly by hemolysis per se, which detects anti-P,
-P₁, -PP₁Pk, -Jka, -Lea, occasionally also anti-Leb and -Vel

extravascular

Outside a blood vessel or the circulatory system.

Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

References in periodicals archive ?

The extravascular stent was shown to be safe postoperatively without migration, collapse, or erosion.

Two-Year Follow-up on Laparoscopic Three-Dimensional Printed Extravascular Stent Placement for Posterior Nutcracker Syndrome

Ultrasound of extravascular lung water: a new standard for pulmonary congestion, Eur Heart J, 2016;37(27):2097-104.

LUNG ULTRASOUND IN THE ASSESSMENT OF HYPERVOLEMIA IN HEMODIALYSIS PATIENTS - TWO CASE REPORTS/ULTRAZVUK PLUCA U PROCENI HIPERVOLEMIJE KOD PACIJENATA NA HEMODIJALIZI - PRIKAZ DVA SLUCAJA

Is pulmonary edema associated with a high extravascular thermal volume?

Short-term effects of stored homologous red blood cell transfusion on cardiorespiratory function and inflammation: an experimental study in a hypovolemia model

Mannitol acts as an immediate plasma expander by drawing fluid from extravascular to intravascular space, as a result improving cerebral blood flow which in turn causes cerebral vasoconstriction.

Vasogenic Cerebral Edema following CT Myelogram with Nonionic Omnipaque 300

DCE-MRI relies on the fact that a bolus of contrast agent passing through the capillary bed is transiently confined within the vascular space before passing rapidly into the extravascular extracellular space at a rate determined by the permeability of the microvessels, their surface area, and blood flow [17,18].

Dynamic Contrast-Enhanced Imaging as a Prognostic Tool in Early Diagnosis of Prostate Cancer: Correlation with PSA and Clinical Stage

HAPE severity according to HULTGREN grades Grade 1 (mild) 3 Grade 2 (moderate) 21 Grade 3 (serious) 93 Grade 4 (severe) 9 Patients of non-HAPE (number %) 22 (14.9) Bronchitis 1 (0.7) Acute upper respiratory infection 4 (2.7) Acute mild high-altitude disease 17 (11.5) Radiologic score of extravascular lung water of HAPE (before treatment) Median (IQR) * 39 (29-48) Range 0-83 * Interquartile range (IQR) expressed as the 25th and 75th percentiles.

Lung Ultrasound Is Accurate for the Diagnosis of High-Altitude Pulmonary Edema: A Prospective Study

Assessment of cardiac preload and extravascular lung water by single transpulmonary thermodilution.

Defibrilasyon Komplikasyonu Olarak Kardiyojenik Sok ve Akciger Hasari / Cardiogenic Shock and Lung Injury as a Complication of Defibrillation

Neutrophils may therefore be needed to phagocytize sulphonamide antibodies-coated red blood cells leading to their ultimate extravascular destruction.

The effect of anti-sulphonamide antibodies on blood cell counts of patients with malaria in Benin City, Nigeria

[10], a study conducted in healthy volunteers reported the presence of higher extravascular haemolysis after older RBC transfusion (storage of 40-42 days) compared with fresh blood (storage of 3-7 days) illustrating the possible harmful effect of iron delivery.

The blood banking controversy: How old is that red blood cell

The degree of contrast medium enhancement is the result of a combination of complex factors including the rate, amount, concentration of contrast material administered; the speed of injection; the timing of the scans; cardiac output; extravascular redistribution; and renal filtration and excretion of contrast material.

HEALTH SCIENCES PAPER ABSTRACTS

The transpulmonary thermodilution provided the following: (1) preload parameters: global end-diastolic volume index (GEDVI), intrathoracic blood volume index (ITBVI), and stroke volume variation (SVV); (2) cardiac parameters: CO, cardiac index (CI), and global ejection fraction (GEF); (3) afterload parameters: systemic vascular resistance index (SVRI); and (4) lung parameters: extravascular lung water index (EVLWI) and pulmonary vascular permeability index (PVPI).

Hemodynamic Analysis of Pediatric Septic Shock and Cardiogenic Shock Using Transpulmonary Thermodilution