# shunt

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## shunt

1. a railway point
2. Electronics a low-resistance conductor connected in parallel across a device, circuit, or part of a circuit to provide an alternative path for a known fraction of the current
3. Med a channel that bypasses the normal circulation of the blood: a congenital abnormality or surgically induced
4. Brit informal a collision which occurs when a vehicle runs into the back of the vehicle in front

## Shunt

an electrical or magnetic conductor connected in parallel with an electric or magnetic circuit to divert part of the electric current or magnetic flux when it is undesirable or impossible to pass all the current or flux through the circuit. For example, when a shunt is used to extend the measuring range of an ammeter, the current Ix being measured is divided between the shunt and the ammeter in inverse proportion to their respective resistances, Rs and RA; in this case Ix = IA (1 + RA/RS) = IAks, where IA is the value of the current as determined from the ammeter readings and ks is the shunting factor. For convenience in making current measurements, the resistance of the shunt is chosen so that ks is equal to 10,100, or 1000.

Shunts are manufactured in the form of plates, bands, and wires, primarily of manganin or constantan (for electrical shunts) or of a soft magnetic material (for magnetic shunts).

## shunt

[shənt]
(civil engineering)
To shove or turn off to one side, as a car or train from one track to another.
(electricity)
A precision low-value resistor placed across the terminals of an ammeter to increase its range by allowing a known fraction of the circuit current to go around the meter. Also known as electric shunt.
To place one part in parallel with another.
(electromagnetism)
A piece of iron that provides a parallel path for magnetic flux around an air gap in a magnetic circuit.
(medicine)
A vascular passage by which blood is diverted from its normal circulatory path; frequently it is a surgical passage created between two blood vessels, but it may also be an anatomical feature.

## shunt

To divert, switch or bypass.
References in periodicals archive ?
Medical management of left-to-right shunt lesions includes anticongestive therapy and nutritional supplements.
Transcatheter PDA occlusion is indicated for treating moderate-sized or large PDA with left-to-right shunt that results in any of the following: congestive heart failure, failure to thrive, pulmonary overcirculation (with or without pulmonary hypertension), or an enlarged left atrium or left ventricle, provided the anatomy and patient size are suitable.
Haemodynamics showed pulmonary arterial hypertension and a large left-to-right shunt.
9) Other electrocardiographic findings may include varying degrees of atrioventricular block and right ventricular hypertrophy if a large left-to-right shunt and/or pulmonary arterial hypertension are present.
This anomaly is accompanied by an intracardiac left-to-right shunt through a patent foramen ovale or an atrial septal defect.
Hoffman et al suggested that an atrial left-to-right shunt resulting from an incompetent foramen ovale may exist in patients without heart disease for more than a year, with eventual closure of the communication.
6 The decision to repair any kind of ASD is based on clinical and compiled echocardiographic information, including size and location of the ASD; haemodynamic impact of the left-to-right shunt and associated right-sided cardiac volume overload; and the presence and degree of pulmonary hypertension.
Thus, the volume of the left-to-right shunt across the defect far exceeded that of the right-to-left shunt.
A left-to-right shunt is converted into a right-to-left shunt secondary to the elevated pulmonary artery pressures and associated pulmonary vascular disease.

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