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EMG/NPhysiology of nerve conduction Membrane potential - ANS An electrical potential difference (voltage) across the membrane, resting =-70mV. Negative ions in cytosol. Positive ions in extracellular fluid. (ECF) Electrochemical gradient - ANS Ions move across membrane down gradient. More sodium outside, more potassium inside. Action potential - ANS Two phases depolarizing and repolarizing. Depolarizing - ANS Neg membrane potential becomes positive. ...

Diagnostic EMG/NCS True or false? Diagnostic EMG/NCS can establish a diagnosis - ANS False Nerve conduction velocity testing measures: - ANS compound action potential Typical nerves tested in UE - ANS median, radial, ulnar Typical nerves tested in LE - ANS Peroneal, posterior tibial, sural For nerve conduction velocity testing, the cathode should be placed ____ to the anode - ANS Distal The recording electrode is placed on the...

Lab 1: Nerve Conduction Velocity Why do we measure three times for each point and take the mean rather than just time each point once and report that? (In other words, why do we take means?) - ANS This way we are putting down uncertainty and so we are able to see variation Why do we calculate the mean velocity between S3-S2 and S2-S1 rather than each of these points individually to the finger twitch? (Hint: if you calculate the point-to-twitch velocities you'll find they're a...

Nerve Conduction Velocity What are the three categories of peripheral neuropathy? - ANS 1. traumatic mononeuropathy 2. multiple mononeuropathy 3. polyneuropathy What are three types of traumatic mononeuropathy? - ANS 1. traumatic myelinopathy (class I) 2. traumatic axonopathy (class II) 3. traumatic severance (class III) What is damaged with traumatic neuropathy? - ANS the myelin sheath at one site When myelin is removed with traumatic myelinopathy ...

EMG and Nerve Conduction Studies surface; needle; single fiber - ANS what are the different types of electromyography electrodiagnostics - ANS Types of _________: 1) Electromyography (electrical activity of mm) 2) Somatosensory evoked potentials (how sensory fibers from LE are firing all the way up to brain and vice versa) 3) Auditory or visual evoked potentials (auditory or visual pathway conduction) 4) Autonomic testing (autonomic neuropathy issues) ...

EMG and NCS electrophysiological testing helps evaluate what? - ANS Localize lesion(only piece of puzzle cant diagnosis alone as history and physical exam is most important aka 75%) Abnormal vs normal neuromuscular function (normal EMG/ NCS test) PNS vs. CNS Neurogenic vs. Myopathic vs. Neuromuscular Junction Myelinopathic vs. Axonopathic Mononeuropathy vs. Polyneuropathy Acuity/Chronicity Severity Ongoing degeneration vs. regeneration what could it be? Slow transc...

Nerve Conduction Velocity (NCV) Study nerve conduction velocity test - ANS - NCV tests the speed of conduction of AP along a nerve - NCV is a test commonly used to evaluate the function of the motor and sensory nerves of human body uses of NCV - ANS - NCV studies are used mainly for evaluation of paresthesias (numbeness, tingling, burning) and/or weakness of arms and legs Some indicators of NCV are - ANS - symptoms of nerve damage as numbness, weakness ...

Anatomy & Physiology: Nerve Impulse Conduction What is the first step in nerve impulse conduction? - ANS Nerve fiber has resting potential by diffusion of Na and K down their concentration gradients. What is the second step in nerve impulse conduction? - ANS Neurons receive stimulation, causing local potentials which may reach threshold. What is the third step in nerve impulse conduction? - ANS Sodium channels in a local region of the membrane open. What is the ...

Introduction to Nerve Conduction Studies definition: analysis and interpretation of electrical signals produced by depolarization of excitable nerve and muscle cells - ANS clinical electrophysiology what terminology to use? - electrodiagnostic testing (EDx) - electroneuromyography (ENMG) - EMG/NCS - most common term people use - electrophysiologic testing - technically more correct term - ANS benefits of electrophysiologic testing: - correlating with physical...

quiz questions NCS What parameter is reported on the EMG report for an F wave study? - ANS F wave latency ANAThe trigeminal (Vth cranial) nerve receives sensation from the - ANS face ANAThe distance used to stimulate the spinal accessory nerve is - ANS 10 cm ANAConduction velocity is recorded in - ANS meters per second ANACool extremities can cause - ANS Higher amplitudes, prolonged distal latencies and slower conduction velocities AN...

Nerve Conduction studies NCS - ANS used to evaluate function of motor & sensory nerves of body NCV - ANS study mainly for evaluation of parethesis &/or weakness of arms & legs disorders commonly diagnosed - ANS peripheal neuropathy, myopathy, diseases of neuromuscular junction Current-NCS - ANS electrodes measure current that travels down nerve pathway EMG - ANS sometimes combined w/ NCS NCS components - ANS Compound Motor Action Po...

Nerve conduction study Nerve conduction study - ANS -recording of evoked responses produced by electrically stimulating a nerve. -to see if the nerve is conducting an impulse slower than normal -If there is a decrease in conduction velocity (speed) then there will be an increase in latency (time). Clinical questions for NCS - ANS Are peripheral nerve fibers compromised? Are sensory fibers, motor fibers, autonomic fibers or all three involved? Where is the nerve le...

Nerve Conduction Which statement describes the synapse? - ANS It is the gap between neurons that ensures that information travels in one direction only. Which list of words describes an action potential? - ANS all or none, membrane potential, electrical signals Which part of the neuron below is indicated by the arrow, and what is its function? - ANS The dendrites carry the electrical impulses from the signal receivers to the cell body Which type of neuron allows...

Nerve CondNerve Conduction What new experimental method was used after the team of scientists had the hypothesis about mirror neurons? - ANS MRI "monkey see monkey do" tests on humans performing tasks Which type of neuron carries information to muscle cells or glands that use information from the brain to perform actions? - ANS motor Which terms below are associated with communication between neurons? - ANS chemical signals, synapse, neurotransmitters Which...

CPPS Practice Exam - Culture A hospital is using the AHRQ Hospital Survey on Patient Safety Culture. There were 80 employees who responded. Responses to the survey item that states "we have patient safety problems in this unit" were as follows: Response # of Respondents Strongly Agree 16 Agree 32 Neither Agree nor Disagree 12 Disagree 17 Strongly Disagree 3 What is the Percent Positive Score that should be reported for this item? A. 75% B. 60% C. 25% D. 20% - ANS ...

Chapter 8 - Physical Inventory The determination of inventory quantity by actual count. Physical inventories can be taken on a continuous, periodic or annual basis - ANS Physical Inventory An essential process for which the property mgr is responsible - ANS The inventory The role of the physical inventory is - ANS to ensure the assets records in the property system physically exist -to determine if unrecorded or improperly recorded transactions have occurred -...

CPPS Module 2 Movement - ANS The act or process of moving, a change of place or position, the physical relocation of property from one area to another. Movement - ANS Effectively tracking throughout the life cycle is on of the most challenging aspects. Movement - ANS Record location must be updated following the movement of an asset and the documentation retained in the property record. Off-Site - ANS Property control policies and procedures must b...

CPPS - Module 1 Accountability - ANS To possess and have use of the property of another with delegated duties and responsibilities, subject to penalty in case of default. Note those "accountable do not have legal or rightful title to the property. Ownership - ANS Having legal or rightful title to property. Responsibility - ANS To be answerable for a trust or obligation. Two key decisions when defining the "control" population of property within an organizatio...

CPPS Practice Exam You are educating clinical managers in your healthcare facility on how to identify appropriate events for conducting a Root Cause Analysis. Which event provides the best opportunity for an RCA? - ANS a. A post-op patient removes his own IV causing a skin tear from the tape b. A patient with no known allergies experiences an anaphylactic reaction to an antibiotic requiring transfer to ICU. c. The biopsy samples from a colonoscopy are never received by pathol...

NPMA Property Management CPPS Exam Property Management - ANS The exercise of a restraining or governing influence over the acquisition , use , and disposition of personal property Property control function names - ANS Property control, Asset Management, fixed-asset accounting, inventory control, material PMO - ANS Property Management Office PMO responsibilities - ANS establishing, guiding, managing, and maintaining an efficient property...