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 mondofacto - Online Medical Dictionary
Category: Health and Medicine > Medical Dictionary
Date & country: 26/01/2008, UK
Words: 116197


ventricular outflow obstruction
Occlusion of the ventricular outflow or inflow tract on either side of the heart. It may result from a congenital defect or predisposing heart disease, or as a complication of surgery or tumours of the heart or its vessels. ... (12 Dec 1998) ...

ventricular plateau
A level diastolic portion of the intraventricular blood pressure curve, representing graphically an equilibrium or final state of filling. ... (05 Mar 2000) ...

ventricular ponderance
A semiobsolete electrocardiographic term suggesting that one ventricle is either larger or thicker than the other. ... (05 Mar 2000) ...

ventricular preexcitation
See: Wolff-Parkinson-White syndrome. ... (05 Mar 2000) ...

ventricular premature complexes
Premature contractions of the ventricle, the most common of all arrhythmias. In the absence of heart disease, they are not of great clinical significance, but in patients with coronary disease, they represent a constant danger of ventricular tachycardia or fibrillation and sudden death. The longer-term prognosis for asymptomatic, healthy subjects w …

ventricular pressure
The pressure within a cardiac ventricle. Ventricular pressure waveforms can be measured in the beating heart by catheterization or estimated using imaging techniques (e.g., doppler echocardiography). The information is useful in evaluating the function of the myocardium, cardiac valves, and pericardium, particularly with simultaneous measurement of …

ventricular rhythm
Synonym for idioventricular rhythm ... A slow independent ventricular rhythm under control of a ventricular centre (which is, by definition, ectopic). ... Synonym: ventricular rhythm. ... (05 Mar 2000) ...

ventricular septal defect
<cardiology, embryology> A congenital heart defect where an abnormal opening exists in the ventricular septum. Blood flows from the higher pressure left ventricle (through the defect) into the right ventricle. ... (12 Jan 1998) ...

ventricular septal rupture
Rupture of the intraventricular septum of the heart, usually secondary to myocardial infarction. ... (12 Dec 1998) ...

ventricular septum
<anatomy> A muscular wall which separates the left ventricle from the right ventricle. The heart's conduction system travels through the ventricular septum. ... Damage to the ventricular septum (for example heart attack) can result in cardiac conduction abnormalities. ... (12 Jan 1998) ...

ventricular systole
Contraction of the ventricles. ... (05 Mar 2000) ...

ventricular tachycardia
<cardiology> Abnormal accelerated ventricular rhythm with a usual rate of 150-200 beats per minute. ... Because ventricular tachycardia originates in the ventricle, it appears as a wide complex rhythm on ECG. A potentially unstable rhythm that may result in fainting, low blood pressure, shock or sudden death. ... Ventricular tachycardia has the …

ventricular trigone
Synonym for collateral trigone ... A triangular prominence of the floor of the lateral ventricle at the transition between occipital and temporal horn, continuous rostrally with the collateral eminence and, like the latter, caused by the deep penetration of the collateral sulcus from the ventral surface of the temporal lobe. ... Synonym: trigonum col …

ventricularis
Synonym: ventricular. ... Synonym: thyroepiglottic muscle. ... Origin: Mod. L. Fr. L. Ventriculus ... (05 Mar 2000) ...

ventricularization
Transformation of an atrial phenomenon to simulate a ventricular one, especially of the atrial (or venous) pulse tracing in tricuspid regurgitation. ... (05 Mar 2000) ...

ventriculite
<paleontology> Any one of numerous species of siliceous fossil sponges belonging to Ventriculites and allied genera, characteristic of the Cretaceous period. ... Many of them were shaped like vases, others like mushrooms. They belong to the hexactinellids, and are allied to the Venus's basket of modern seas. ... See: Ventriculus. ... Source: Web …

ventriculitis
Inflammation of the ventricles of the brain. ... Origin: ventricle + G. -itis, inflammation ... (05 Mar 2000) ...

ventriculo-
A ventricle. ... Origin: L. Ventriculus ... (05 Mar 2000) ...

ventriculoatrial
Relating to both ventricles and atria, especially to the sequential passage of conduction in the retrograde direction from ventricle to atrium. ... (05 Mar 2000) ...

ventriculoatrial conduction
Synonym for retrograde conduction ... Conduction backward from the ventricles or from the A-V node into and through the atria. ... Synonym: retroconduction, ventriculoatrial conduction, V-A conduction. ... (05 Mar 2000) ...

ventriculocisternostomy
<procedure> An artificial opening between the ventricles of the brain and the cisterna magna. ... See: shunt. ... Origin: ventriculo-+ L. Cisterna, cistern, + G. Stoma, mouth ... (05 Mar 2000) ...

ventriculography
1. Radiograph demonstration of the cerebral ventricles by direct injection of air or contrast medium; developed and described by Dandy in 1918. ... Compare: pneumoencephalography. ... 2. Demonstration of the contractility of the cardiac ventricles by recording serially the distribution of intravenously injected radionuclide or that of radiographic co …

ventriculography, first-pass
Radionuclide ventriculography where a bolus of radionuclide is injected and data are recorded from one pass through the heart ventricle. Left and right ventricular function can be analyzed independently during this technique. First-pass ventriculography is preferred over gated blood pool imaging for assessing right ventricular function. ... (12 Dec …

ventriculomastoidostomy
<procedure> Operation for the establishment of a communication between the lateral cerebral ventricle and the mastoid antrum by means of a polythene tube for the relief of hydrocephalus. ... See: shunt. ... Origin: ventriculo-+ mastoid, + G. Stoma, mouth ... (05 Mar 2000) ...

ventriculonector
Synonym: atrioventricular bundle. ... Origin: ventriculo-+ L. Necto, to join ... (05 Mar 2000) ...

ventriculoperitoneal shunt
<procedure> A surgical procedure to insert a communicating catheter to relieve intracranial pressure caused by hydrocephalus. ... In this procedure the cerebrospinal fluid is shunted from the ventricles of the brain into the peritoneal cavity via a surgically implanted tube. ... (27 Sep 1997) ...

ventriculophasic
Influenced by ventricular contraction; applied to the atrial rhythm when this is modified by ventricular contraction; in ventriculophasic sinus arrhythmia in complete A-V block the sinus impulse immediately following a ventricular contraction usually appears sooner than expected. ... (05 Mar 2000) ...

ventriculoplasty
Any surgical procedure to repair a defect of one of the ventricles of the heart. ... Origin: ventriculo-+ G. Plastos, formed ... (05 Mar 2000) ...

ventriculopuncture
Insertion of a needle into a ventricle. ... (05 Mar 2000) ...

ventriculoradial dysplasia
A congenital syndrome consisting of a ventricular septal defect with associated absence of thumb or radius. ... (05 Mar 2000) ...

ventriculoscopy
Direct inspection of a ventricle with an endoscope. ... Origin: ventriculo-+ G. Skopeo, to view ... (05 Mar 2000) ...

ventriculostomy
<procedure> Surgical creation of an opening in a cerebral ventricle. ... (12 Dec 1998) ...

ventriculosubarachnoid
Relating to the space occupied by the cerebrospinal fluid. ... Origin: ventriculo-+ subarachnoid ... (05 Mar 2000) ...

ventriculotomy
<procedure> Incision into a ventricle; e.g., into the cerebral third ventricle for the relief of hydrocephalus or into a cardiac ventricle to surgically correct an abnormality.. ... Origin: ventriculo-+ G. Tome, incision ... (05 Mar 2000) ...

ventriculus cordis
Synonym for ventricles of heart ... One of the two lower chambers of the heart. ... Synonym: ventriculus cordis. ... (05 Mar 2000) ...

ventriculus dexter
Synonym for right ventricle ... The muscular chamber of the heart which accepts blood from the right atrium and pumps it through the pulmonary artery into the lungs. ... (27 Sep 1997) ...

ventriculus laryngis
Synonym for laryngeal ventricle ... The recess in each lateral wall of the larynx between the vestibular and vocal folds and into which the layrngeal sacculus opens. ... Synonym: ventriculus laryngis, laryngeal sinus, Morgagni's sinus, Morgagni's ventricle, sinus laryngeus. ... (05 Mar 2000) ...

ventriculus lateralis
Synonym for lateral ventricle ... A cavity shaped somewhat like a horseshoe in conformity with the general shape of the hemisphere; each lateral ventricle communicates with the third ventricle through the interventricular foramen of Monro, and expands from there forward into the frontal lobe as the anterior horn as well as caudally over the thalamus …

ventriculus quartus
Synonym for fourth ventricle ... A cavity of irregular tentlike shape extending from the obex rostralward to its communication with the sylvian aqueduct, enclosed between the cerebellum dorsally and the rhombencephalic tegmentum ventrally, having a rhomboid-shaped floor (rhomboid fossa) and a tentlike roof which in its caudal part is formed by the t …

ventriculus quintus
Synonym for cavity of septum pellucidum ... A slitlike, fluid-filled space of variable width between the left and right transparent septum, which occurs in less than 10% of human brains and may communicate with the third ventricle. ... Synonym: cavum septi pellucidi, Duncan's ventricle, fifth ventricle, pseudocele, pseudoventricle, sylvian ventricle, …

ventriculus sinister
Synonym for left ventricle ... <anatomy> The muscular chamber of the heart which accepts blood from the left atrium and ejects it into the aorta to the systemic circulation. ... (27 Sep 1997) ...

ventriculus terminalis
Synonym for terminal ventricle ... A dilation of the central canal of the spinal cord at the tip of the medullary cone. ... Synonym: ventriculus terminalis. ... (05 Mar 2000) ...

ventriculus tertius
Synonym for third ventricle ... A narrow, vertically oriented, irregularly quadrilateral cavity in the midplane, extending from the lamina terminalis to the rostral opening of the mesencephalic aqueduct. This ventricle communicates at its rostrodorsal corner with each of the two lateral ventricles through the left and right interventricular foramen …

ventriduct
To draw toward the abdomen. ... Origin: L. Venter, belly, + duco, pp. Ductus, to lead ... (05 Mar 2000) ...

ventriduction
Drawing toward the abdomen or abdominal wall. ... (05 Mar 2000) ...

ventro-
<anatomy, prefix> A combining form used in anatomy to indicate connection with, or relation to, the abdomen; also, connection with, relation to, or direction toward, the ventral side; as, ventrolateral; ventro-inguinal. ... Origin: L. Venter = belly. ... (29 Oct 1998) ...

ventrobasal nucleus
Synonym for ventral posterior nucleus of thalamus ... The large posterior part of the ventral nucleus of the thalamus receiving the somatic sensory lemnisci (medial lemniscus, spinothalamic tract, trigeminal lemniscus) and the ascending gustatory (taste) lemniscus, and projecting in turn by way of the internal capsule to the cortex of the postcentra …

ventrocystorrhaphy
Synonym: cystopexy. ... Origin: ventro-+ G. Kystis, cyst, + rhaphe, suture ... (05 Mar 2000) ...

ventrodorsad
In a direction from the venter to the dorsum. ... (05 Mar 2000) ...

ventrolateral
<anatomy> Both ventral and lateral, i.e., to the front and to the side. ... (05 Mar 2000) ...

ventromedial hypothalamic nucleus
<anatomy> A nucleus of the middle hypothalamus, the largest cell group of the tuberal region with small-to-medium size cells. ... (12 Dec 1998) ...

ventromedian
Relating to the midline of the ventral surface. ... (05 Mar 2000) ...

ventroptosis
Ventroptosia ... Synonym: gastroptosis. ... Origin: ventro-+ G. Ptosis, a falling ... (05 Mar 2000) ...

ventroscopy
Synonym: peritoneoscopy. ... Origin: ventro-+ G. Skopeo, to view ... (05 Mar 2000) ...

ventrotomy
Synonym: celiotomy. ... Origin: ventro-+ G. Tome, incision ... (05 Mar 2000) ...

Venturi effect
Term applied to the operation of a Venturi tube and similar systems. ... (05 Mar 2000) ...

Venturi meter
A device for measuring flow of a fluid in terms of the drop in pressure when the fluid flows into the constriction of a Venturi tube. ... (05 Mar 2000) ...

Venturi tube
A tube with a specially streamlined constriction to minimise energy losses in the fluid flowing through it while maximizing the fall in pressure in the constriction in accordance with Bernoulli's law; the basis of the Venturi meter. ... (05 Mar 2000) ...

Venturi, Giovanni
<person> Italian physicist, 1746-1822. ... See: Venturi effect, Venturi meter, Venturi tube. ... (05 Mar 2000) ...

venturicidins
<chemical> Toxic substances isolated from various strains of streptomyces. They are 20-membered macrolides that inhibit oxidative phosphorylation and mitochondrial atpases. Venturicidins a and b are glycosides. Used mainly as tools in the study of mitochondrial function. ... Pharmacological action: antibiotics, antifungal, uncoupling agents.
venula
Synonym: venule. ... Origin: L. Dim. Of vena, vein ... (05 Mar 2000) ...

venula macularis inferior
Synonym for inferior macular venule ... A small tributary of the central vein of the retina that drains the lower part of the macula. ... Synonym: venula macularis inferior. ... (05 Mar 2000) ...

venula macularis superior
Synonym for superior macular venule ... A small tributary of the central vein of the retina that drains the upper part of the macula. ... Synonym: venula macularis superior. ... (05 Mar 2000) ...

venula medialis retinae
Synonym for medial venule of retina ... The small vein that passes from the part of the retina between the macula and the optic disk to join the central vein. ... Synonym: venula medialis retinae. ... (05 Mar 2000) ...

venula nasalis retinae inferior
Synonym for inferior nasal venule of retina ... The small vein that passes from the inferior medial (nasal) part of the retina to join the central vein. ... Synonym: venula nasalis retinae inferior. ... (05 Mar 2000) ...

venula nasalis retinae superior
Synonym for superior nasal venule of retina ... The small vein that drains blood from the upper medial (nasal) part of the retina; it joins the central vein. ... Synonym: venula nasalis retinae superior. ... (05 Mar 2000) ...

venula temporalis retinae inferior
Synonym for inferior temporal venule of retina ... The small vein that passes from the lower lateral (temporal) part of the retina to enter the central vein. ... Synonym: venula temporalis retinae inferior. ... (05 Mar 2000) ...

venula temporalis retinae superior
Synonym for superior temporal venule of retina ... The venule that passes from the upper lateral (temporal) part of the retina to join the central vein. ... Synonym: venula temporalis retinae superior. ... (05 Mar 2000) ...

venulae rectae renis
Synonym for straight venules of kidney ... Venules that drain the medullary pyramids of the kidney; they open into arcuate veins. ... Synonym: venulae rectae renis. ... (05 Mar 2000) ...

venulae stellatae
The star-shaped groups of venules in the renal cortex. ... Synonym: stellate veins, stellate venules, stellulae verheyenii, venae stellatae, Verheyen's stars. ... (05 Mar 2000) ...

venular
Pertaining to venules. ... Synonym: venulous. ... (05 Mar 2000) ...

venules
The minute vessels that collect blood from the capillary plexuses and join together to form veins. ... (12 Dec 1998) ...

venulous
Synonym for venular ... Pertaining to venules. ... Synonym: venulous. ... (05 Mar 2000) ...

venus
1. The goddess of beauty and love, that is, beauty or love deified. ... 2. <anatomy> One of the planets, the second in order from the sun, its orbit lying between that of Mercury and that of the Earth, at a mean distance from the sun of about 67,000,000 miles. Its diameter is 7,700 miles, and its sidereal period 224.7 days. As the morning star …

VER
<abbreviation> Visual evoked response. ... See: evoked response. ... (05 Mar 2000) ...

verapamil
<drug> A calcium channel blocking drug, used as a coronary vasodilator and antiarrhythmic. ... Pharmacologic action: Calcium channel blockade, direct, potent negative chronotrope and inotrope, slows conduction in AV node, systemic and coronary vasodilation. ... Uses: Supraventricular tachycardias. ... Dose: 2.5 - 5.0 mg IV over 1-2 minutes May r …

veratrate 3-O-demethylase
<enzyme> Forms isovanillic acid from veratric acid; see also 4-methoxybenzoate monooxygenase (o-demethylating) ... Registry number: EC 1.14.99.- ... (26 Jun 1999) ...

veratric acid
C9H10O4; 3,4-Dimethoxybenzoic acid;obtained by methylation and subsequent oxidation of protocatechuic acid; present in the seeds of Schoenocaulon officinale (Sabadilla officinarum). ... (05 Mar 2000) ...

veratridine
<chemical> 3-veratroylveracevine. One of the components in the veratrine mixture of alkaloids. Found in the seed of schoenocaulon officinale and in rhizome of veratrum album l., liliaceae. ... Chemical name: Cevane-3,4,12,14,16,17,20-heptol, 4,9-epoxy-, 3-(3,4-dimethoxybenzoate), (3beta,4alpha,16beta)- ... (12 Dec 1998) ...

veratrine
<chemistry> A poisonous alkaloid obtained from the root hellebore (Veratrum) and from sabadilla seeds as a white crystalline powder, having an acrid, burning taste. It is sometimes used externally, as in ointments, in the local treatment of neuralgia and rheumatism. ... Synonym: veratria, and veratrina. ... Origin: Cf. F. Veratrine. See Veratru …

veratrum
<botany> A genus of coarse liliaceous herbs having very poisonous qualities. ... Veratrum album of Europe, and Veratrum viride of America, are both called hellebore. They grow in wet land, have large, elliptical, plicate leaves in three vertical ranks, and bear panicles of greenish flowers. ... Origin: L. Veratrum hellebore. ... Source: Websters …

Veratrum album
The rhizome has emetic and cathartic actions. ... (05 Mar 2000) ...

veratrum alkaloids
<chemical> Alkaloids with powerful hypotensive effects isolated from american or european hellebore (veratrum viride ait. Liliaceae and veratrum album l. Liliaceae). They increase cholinergic and decrease adrenergic tone with appropriate side effects and at higher doses depress respiration and produce cardiac arrhythmias; only the ester alkal …

Veratrum viride
The dried rhizome and roots contain therapeutically important alkaloids (cevadine, veratridine, jervine, pseudojervine, rubijervine, and several ester alkaloids of the base germine) used in the treatment of hypertensive disorders. ... (05 Mar 2000) ...

veratryl alcohol oxidase
<enzyme> From pleurotus sajor-caju (polyporaceae); converts veratryl alcohol and various aromatic alcohols to aldehydes, reducing o2 to h2o2 ... Registry number: EC 1.1.3.- ... Synonym: veratryl alcohol oxidase I, veratryl alcohol oxidase II ... (26 Jun 1999) ...

verbal agraphia
Agraphia in which single letters can be written, but not words. ... (05 Mar 2000) ...

verbal apraxia
A speech disorder in which phonaemic substitutions are constantly used for the desired syllable or word. ... (05 Mar 2000) ...

verbal behaviour
Includes both producing and responding to words, either written or spoken. ... (12 Dec 1998) ...

verbal learning
Learning to respond verbally to a verbal stimulus cue. ... (12 Dec 1998) ...

verbarium
A game in word making. See Logomachy. ... Origin: NL, fr. L. Verbum word. ... (01 Mar 1998) ...

verbena
<botany> A genus of herbaceous plants of which several species are extensively cultivated for the great beauty of their flowers; vervain. ... Verbena, or vervain, was used by the Greeks, the Romans, and the Druids, in their sacred rites. Essence of verbena, Oil of verbena, a perfume prepared from the lemon verbena; also, a similar perfume prop …

verbigeration
Constant repetition of meaningless words or phrases; seen in schizophrenia. ... Synonym: catalogia, cataphasia, oral stereotypy. ... Origin: L. Verbum, word, + gero, to carry about ... (05 Mar 2000) ...

verbomania
<psychiatry> An abnormal talkativeness; a psychotic flow of speech. ... Origin: L. Verbum, word, + G. Mania, frenzy ... (05 Mar 2000) ...

verdant
1. Covered with growing plants or grass; green; fresh; flourishing; as, verdant fields; a verdant lawn. 'Let the earth Put forth the verdant grass.' (Milton) ... 2. Unripe in knowledge or judgment; unsophisticated; raw; green; as, a verdant youth. ... Origin: F. Verdoyant, p. Pr. Of verdoyer to be verdant, to grow green, OF. Verdoier, verdeier, fr. V …

verdigris
1. <chemistry> A green poisonous substance used as a pigment and drug, obtained by the action of acetic acid on copper, and consisting essentially of a complex mixture of several basic copper acetates. ... 2. The green rust formed on copper. ... This rust is a carbonate of copper, and should not be confounded with true verdigris. ... <chemist …

verditer
<chemistry> Verdigris. ... Either one of two pigments (called blue verditer, and green verditer) which are made by treating copper nitrate with calcium carbonate (in the form of lime, whiting, chalk, etc) They consist of hydrated copper carbonates analogous to the minerals azurite and malachite. Verditer blue, a pale greenish blue colour, like …

verdoglobin
An obsolete term for choleglobin. ... (05 Mar 2000) ...

verdohemochrome
An intermediate stage in haemoglobin degradation to yield the bile pigments, i.e., haemoglobin yields choleglobin (verdohemoglobin) and the loss of globin leaves verdohemochrome, the precursor of biliverdin. ... (05 Mar 2000) ...

verdohemoglobin
Synonym for choleglobin ... <protein> A protein which is formed from the breakdown of haemoglobin (a protein that carries oxygen in the blood) and is a precursor to the bile pigment biliverdin. ... (09 Oct 1997) ...

verdoperoxidase
A peroxidase, occurring in leukocytes, that contains a greenish ferriheme; responsible for the peroxidase activity of pus. ... (05 Mar 2000) ...