What is the difference between orthodromic and antidromic conduction?

In an orthodromic study, the recording electrodes measure the action potential traveling in the physiologic direction. In an antidromic study, the recording electrodes measure the action potential traveling opposite the physiologic direction.

What is antidromic stimulation?

Antidromic stimulation is performed to determine if a neuron that you are recording from projects to a particular region of the nervous system. You stimulate the axon of the neuron, and an action potential propagates backwards (antidromically) to the cell body, where recordings are occurring.

How does antidromic work?

An antidromic impulse in an axon refers to conduction opposite of the normal (orthodromic) direction. For most neurons, their dendrites, soma, or axons are depolarized forming an action potential that moves from the starting point of the depolarization (near the cell body) along the axons of the neuron (orthodromic).

What is the Orthodromic conduction?

Orthodromic, therefore, means conducting impulses in the normal or correct direction. Orthodromic denotes the propagation of an impulse along a conduction system (for example, nerve fiber) in the direction it normally travels.

What is meant by Orthodromic conduction?

1 : proceeding or conducting in a normal direction —used especially of a nerve impulse or fiber orthodromic neural stimulation. 2 : characterized by orthodromic conduction in orthodromic tachycardia, the atrial impulse conducts in an antegrade direction from the atria through the AV node— Norris Lai & Melvyn Rubenfire.

What is orthodromic stimulation?

Orthodromic technique. Stimulating electrodes are usually ring electrodes placed around the proximal and middle phalanxes of the 2nd or 3rd digits and the recording electrodes are placed on the ventral aspect of the wrist, over the median nerve, usually at about 1–2 cm proximal to the proximal wrist crease.

What is the orthodromic conduction?

What is meant by orthodromic conduction?

What is Antidromic tachycardia?

Antidromic reentrant tachycardia is a wide QRS tachycardia with the morphology of a fully preexcited ventricular complex. The conduction proceeds in the anterograde direction through the bypass tract and returns via the His bundle and AV node (see Figure 20-13B). This is the least common cause of wide QRS tachycardia.

Do you obtain an action potential if the impulse is Antidromic?

(2009) have concluded that reliable action potentials can be obtained in antidromic recordings at 25% of the stimulus intensity that would generate a maximal response.

What does Nondecremental mean?

the propagation of a nerve impulse along an axon in which the amplitude of the impulse is maintained as it progresses. Compare decremental conduction.

What is orthodromic AVRT?

Orthodromic AVRT means that the ventricles are depolarized normally via the atrioventricular node and His-Purkinje system (Figure 3). Because the impulse reaches the ventricles through the His-Purkinje network the QRS complexes will appear normal (i.e QRS duration will be <0.12 s).