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Topic: Constriction

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	Constriction - Wikipedia, the free encyclopedia
		Constriction is a method used by various snake species to kill its prey.
		Constriction, the opposite of dilation or dilatation, also refers to vasoconstriction, the narrowing of blood vessels caused by vascular smooth muscle contractions.
		Constriction can also refer to the act of binding a victim with rope, either as a method of torture or sexual bondage.
	en.wikipedia.org /wiki/Constriction (260 words)

	Constriction Band Syndrome (Amniotic Band Syndrome) - Children's Hospital Boston
		Constriction band syndrome (also referred to as "amniotic band syndrome") is a common cause of congenital limb differences.
		Constriction band syndrome is thought to occur in 1 per 10,000-15,000 births.
		Deeper constrictions bands may need to be surgically excised to prevent growth abnormalities and to improve the appearance of the affected part.
	www.childrenshospital.org /az/Site1156/printerfriendlypageS1156P0.html (438 words)

	Pupillary reflex - Wikipedia, the free encyclopedia
		Pupillary constriction may be induced pharmacologically by parasympathomimetics and is also seen in accommodation (when the eyes focus on something close).
		Emergency room physicians often assess the pupillary reflex because it is useful for gauging brain stem function.
		The oculomotor nerve is responsible for the efferent limb of the pupillary reflex; in other words, it drives the muscles that constrict the pupil.
	en.wikipedia.org /wiki/Pupil_constriction (499 words)

	Medical information on penis pumps (constriction vacuum pump) used to treat erectile dysfunction on MedicineNet.com
		A vacuum constriction device (VCD) is an external pump with a band on it that a man with erectile dysfunction can use to get and maintain an erection.
		A constriction ring or band is placed on the cylinder at the other end, which is applied to the body.
		Vacuum constriction devices should not be used by men who may have a significant congenital bleeding disorder or a disorder that predisposes them to a condition called priapism
	www.medicinenet.com /penis_prosthesis/article.htm (510 words)

	Pericardial Constriction
		In patients with constrictive pericarditis and sinus rhythm, the RA a and v waves also may be equal, but the venous pressure is increased, which is unusual with isolated ASD.
		In patients with constrictive pericarditis who are in atnal fibrillation, the cv wave is prominent and the y descent rapid.
		In both constrictive pericarditis and severe right-sided heart failure, the venous pressure is elevated with a sharp y dip in the JVP.
	www.rjmatthewsmd.com /Definitions/pericardial_constriction.htm (1787 words)

	Constriction in snakes (Site not responding. Last check: 2007-11-03)
		Constriction involves wrapping loops of the body around a prey animal to restrain it so that it cannot escape or injure the snake, and to kill it before ingestion.
		Constriction was probably a key innovation in the evolution of snakes and was associated with the diversification of snakes.
		Constriction is usually assumed to kill prey by suffocation because the forces exerted appear to interfere with breathing in the prey.
	www.ucs.louisiana.edu /~brm2286/constrct.htm (427 words)

	Coronary Myogenic Constriction Antagonizes EDHF-Mediated Dilation: Role of KCa Channels -- Gschwend et al. 41 (4): 912 ... (Site not responding. Last check: 2007-11-03)
		A, Myogenic constriction (percent decrease from passive diameter) in coronary arteries at intraluminal pressure of 70 mm Hg (n=9) and 130 mm Hg (n=8).
		C, Myogenic constriction (percent decrease from passive diameter) in mesenteric arteries at intraluminal pressure of 70 mm Hg in absence (control, n=9) and presence of NS1619 (30 µmol/L, n=5).
		A, Myogenic constriction (percent decrease from passive diameter) in mesenteric arteries at intraluminal pressure of 70 mm Hg (n=9) and 130 mm Hg (n=8).
	hyper.ahajournals.org /cgi/content/full/41/4/912 (3917 words)

	DETECTING THE APICAL CONSTRICTION IN CURVED MANDIBULAR MOLAR ROOTS
		The aim of this study was to compare the effect on tactile detection of apical constriction in mandibular molars with curved roots, between the preflared and non-flared root canals.
		especially in severely constricted canals, which are often narrower near the orifice, owing to the chronic calcific pulpal degeneration in the pulp chamber.
		The reason may be the constricted orifice of the canal or the coronal part of it, which binds the file before it actually reaches the apex and gives the operator a false impression of the apical constriction feeling.
	www.ayubmed.edu.pk /JAMC/PAST/15-3/irfanullah.htm (1856 words)

	[No title]
		The losses in the constricted tube htotal 2 are equal to the losses due to the tubing as well as the losses due to the constriction.
		We observed that as the constrictions made by the clamp were increased, the constriction in the tube approached the shape of a well-defined rectangle.
		Constriction fraction was defined as the fraction of the cross sectional area of the constricted tube versus the cross sectional area of the open tube.
	www.seas.upenn.edu /courses/belab/LabProjects/1999/be310s99m3r01.doc (2646 words)

	Inhibition of In Vivo Constriction of Fetal Ductus Arteriosus by Endothelin Receptor Blockade in Rats -- MOMMA et al. ... (Site not responding. Last check: 2007-11-03)
		Constriction of the preterm DA by dexamethasone or
		(100 mg/kg) of bosentan inhibited fetal ductal constriction
		is a mediator of fetal and neonatal ductal constriction.
	www.pedresearch.org /cgi/content/full/53/3/479 (3316 words)

	Secondary constriction - Wikipedia, the free encyclopedia
		Secondary constriction is seen at the chromosome in addition to primary constricition.
		Chromosome can bend only at the site of primary constriction during apaphase.
		Secondary constrictions are useful in identifying a chromosome from a set.
	en.wikipedia.org /wiki/Secondary_constriction (95 words)

	Effects of Aortic Constriction During Experimental Acute Right Ventricular Pressure Loading : Further Insights Into ... (Site not responding. Last check: 2007-11-03)
		PA constriction shifted the loop to the right and upward, but the loop was still positive, which suggests that ischemia is not an important factor.
		PA constriction caused a rightward shift in the loop and a negative loop.
		A positive loop during aortic constriction was observed in the seven animals in which the control loop was normal.
	circ.ahajournals.org /cgi/content/full/92/3/546 (4604 words)

	Tresorie - NEW SUGGESTIONS IN THE TREATMENT OF CONSTRICTION OF THE OESOPHAGUS [Suggestion In Treatment Of Constriction ...
		The constriction commences with a very slight difficulty in swallowing solids, accompanied with a sensation that some thing has lodged in the gullet, and necessitates the use of some kind of liquid to remove it.
		The cause of this form of constriction, we believe to be a deficiency in the nerve supply to the muscle of the oesophagus at a particular point, which suggests some diseased condition of the base of the brain.
		The malignant form of constriction is of the most serious character and the one in which we have less hope of doing anything to permanently relieve the patient.
	www.homeoint.org /hompath/articles/145.html (3238 words)

	Pressure-dependent myogenic constriction of cerebral arteries occurs independently of voltage-dependent activation -- ... (Site not responding. Last check: 2007-11-03)
		Original traces show pressure-induced constriction (A), changes in the 340/380 fluorescence ratio in response to elevations of intraluminal pressure (B), and the normalized 340/380 fluorescence ratio at the indicated intraluminal pressure (number of observations is in parentheses) (C).
		Representative traces show pressure-induced constriction (A), corresponding 340/380 fluorescence ratio (B), and depolarization-induced constriction produced by 60 mM KPSS (C), corresponding 340/380 fluorescence ratio (D), and ratio comparison of the change in diameter to the change in the 340/380 fluorescence ratio (E).
		We have previously shown that pressure-induced constriction in rat cerebral arteries is mediated by PKC (40, 41).
	ajpheart.physiology.org /cgi/content/full/283/6/H2187 (5412 words)

	Stroke Development in Stroke-Prone Spontaneously Hypertensive Rats Alters the Ability of Cerebrovascular Muscle to ... (Site not responding. Last check: 2007-11-03)
		In the case of MCA from srSHR or prestroke SHRSP, constriction to the aforementioned agonists was phasic in the presence of nifedipine or in Ca -free/EGTA Krebs’ solution.
		The MCAs of srSHR and prestroke SHRSP constricted in response
		The peak constriction to vasopressin (2) and the degree of constriction over the maximal relaxed state after 10 minutes in the presence of vasopressin (3) are shown.
	stroke.ahajournals.org /cgi/content/full/34/6/1491 (3619 words)

	Cellular Mechanisms Mediating Rat Renal Microvascular Constriction by Angiotensin II -- Takenaka et al. 100 (8): 2107 ... (Site not responding. Last check: 2007-11-03)
		AngII decreased efferent arteriolar diameter from 18.4 to 12.8
		In the fourth group, the influence of NEM on AngII-induced microvascular constriction was assessed (five kidneys).
		constriction was not altered significantly by the inhibition of
	www.jci.org /cgi/content/full/100/8/2107 (4845 words)

	News - Vigabatrin-Induced Visual Field Constriction Is Irreversible
		Visual field constriction associated with use of vigabatrin for the treatment of epilepsy seems to persist after discontinuation.
		There was no statistically significant change in the size of patients' visual field from the time visual field constriction was first diagnosed to either the first or second year after diagnosis.
		According to the authors, this small study suggests that visual field constriction associated with use of vigabatrin is not reversible, even two years after stopping the drug.
	docguide.com /news/content.nsf/news/8525697700573E1885256C22006BA6EC (397 words)

	Nitric oxide-endothelin-1 interactions after acute ductal constriction in fetal lambs -- Ovadia et al. 282 (3): 862 -- ... (Site not responding. Last check: 2007-11-03)
		Acute ductal constriction induced an initial increase in pulmonary blood flow and decrease in pulmonary vascular resistance.
		A second component that may mediate the pulmonary vasoconstriction after ductal constriction is a decrease in NOS activity.
		In summary, we demonstrated that acute ductal constriction induces an acute increase in pulmonary blood flow that is followed
	ajpheart.physiology.org /cgi/content/full/282/3/H862 (5309 words)

	Vacuum Constriction Devices
		An erection obtained by the vacuum constriction device is not the same as an erection achieved naturally.
		The constriction band traps the ejaculate or semen at the time of orgasm.
		Vacuum constriction devices vary in cost from $300 to $500, depending on the brand and type.
	www.webmd.com /content/article/57/66230.htm (579 words)

	Atlanta Case 12 (Site not responding. Last check: 2007-11-03)
		The annular constriction bands can involve any part of the body and vary from minor digital deformities to reports of nerve palsies and pseudoarthroses of long bones to congenital amputations, including a case report of a congenital decapitation!
		Club feet in association with constriction bands are relatively rigid and difficult to treat.
		A fetal lamb model of this disorder has been developed by simple banding of extremities in utero and is claimed to replicate the clinical features of the disease.
	www.iol.ie /~rcsiorth/journal/volume2/march/a12.htm (254 words)

	DermAtlas: Online Dermatology Image Library dermatology image,constriction band,amnion disruption ... (Site not responding. Last check: 2007-11-03)
		This toddler was noted to have constriction bands at birth consistent with amnion disruption sequence.
		An amniotic constriction band produced a circumferential injury to the second right finger of this otherwise healthy newborn.
		During adolescence she began to develop constriction bands of her fingers resulting in both autoamputation and surgical ampitation in an attempt to preserve function.
	dermatlas.med.jhmi.edu /derm/result.cfm?Diagnosis=1059104113 (707 words)

	Relaxation of Endothelin-1-Induced Pulmonary Arterial Constriction by Niflumic Acid and NPPB: Mechanism(s) Independent ... (Site not responding. Last check: 2007-11-03)
		be expected to slow the rising phase of constriction.
		Effects of niflumic acid and NPPB on ET-1-induced constriction in the presence of nifedipine and in Ca -free PSS.
		Niflumic acid (30 µM) caused a further relaxation in the nicardipine-insensitive component of the constriction.
	jpet.aspetjournals.org /cgi/content/full/288/3/1242 (5678 words)

	Constriction/Spreading Resistance Model for Electronics Packaging
		An analytical model is developed for predicting constriction and spreading resistances associated with heat transfer from various electronic components under different modes of cooling.
		The model assumes a heat source in contact with a larger cold plate which is in turn cooled with a convective heat transfer coefficient specified over the sink surface.
		Dimensionless expressions in the form of infinite series are provided for computing the average and maximum constriction resistances as a function of relative contact size, plate thickness and the Biot number.
	www.aavidthermalloy.com /technical/papers/constriction.shtml (116 words)

	External Penile Vacuum Constriction Devices
		Vacuum constriction devices consist of a hollow plastic cylinder, a vacuum pump, a connector tube between the cylinder and the pump, and an elastic constriction band.
		After the attachment of the cylinder, a vacuum draws blood into the penis and the blood is held in place temporarily by a constricting band.
		External penile vacuum constriction devices for the treatment of erectile dysfunction are considered medically necessary if the medical appropriateness criteria are met.
	www.bcbst.com /MPManual/External_Penile_Vacuum_Constriction_Devices.htm (290 words)

	Researchers Identify “Light Meter” that Controls Pupil Constriction
		In that nonvisual pathway, melanopsin is thought to play the dominant role in synchronizing the mouse’s internal circadian clock to external light and dark cycles.
		In these experiments, however, Van Gelder, and his research team demonstrated that the constriction of the pupil in the chick eye seems to be regulated by cryptochrome rather than melanopsin, Melanopsin is part of the family of proteins, called opsins, that mediate normal visual function.
		In a series of experiments led by first author Daniel C. Tu, a graduate student in Van Gelder’s lab, the researchers looked at the chick eye under various kinds of light and treated it with drugs that disrupt normal, opsin-mediated visual pathways in insects and mammals.
	mednewsarchive.wustl.edu /medadmin/PAnews.nsf/0/AFF245E556A3AC0D86256F1E00742A4E (786 words)

	Father With Asthma Is Key To Child's Airway Constriction
		Children with asthma whose fathers have a history of the disease are at significantly greater risk for serious airway constriction than children whose father have no such history.
		In reporting the results of a 5-year study, the investigators said that paternal asthma was strongly associated with childhood airway hyperresponsiveness (AHR), an exaggerated constricting response to various stimuli that characterize asthma.
		Called a defining feature of asthma, AHR is directly correlated with pulmonary symptoms and disease severity, according to the authors.
	www.medicalnewstoday.com /medicalnews.php?newsid=30000&nfid=rssfeeds (426 words)

	Estrogen, SERMS reduce asthma impact by halting constriction
		Now, scientists at the Medical College of Georgia have shown that elevated estrogen levels may reduce the severity of asthma and perhaps of other chronic lung diseases involving airway constriction.
		Each ring was exposed to a range of carbachol concentrations and the magnitude of the constrictor responses was measured.
		Rings that were exposed to sera from asthmatic patients constricted more than twice as much and at lower carbachol concentrations than rings exposed to sera from normal human subjects (IgE under 70).
	www.pharma-lexicon.com /medicalnews.php?newsid=22190 (822 words)

	Relationship between heterogeneous changes in airway morphometry and lung resistance and elastance -- Lutchen and ... (Site not responding. Last check: 2007-11-03)
		Impact of central vs. peripheral constriction on lung resistance and lung elastance spectra.
		is tissue stiffening occurring simultaneously with airway constriction.
		Tissue resistance in the guinea pig at baseline and during methacholine constriction.
	jap.physiology.org /cgi/content/full/83/4/1192 (5299 words)

	MHTL Research--Modeling Thermal Constriction Resistance of a Sphere — Layered Substrate in Elastic Contact
		Develop a thermo-mechanical model for computing the constriction resistance of a sphere in elastic contact with a flat coated by metallic or nonmetallic (elastomer) layer.
		The analytical model has been verified by comparing thermal constriction resistance measurements obtained by Fisher for a steel sphere contacting a nickel flat coated by silver layer.
		Mirko Stevanovic and M.M. Yovanovich, 1999, "Modeling Thermal Constriction Resistance of Sphere - Layered Substrate in Elastic Contact", 37th AIAA Aerospace Science Meeting and Exhibit, 11-14 January 1999, Reno Hilton, Reno, Nevada.
	www.mhtl.uwaterloo.ca /new/research/elastcont.html (202 words)

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