Module 1 Flashcards
Where are stimulator electrodes placed?
directly over ulnar groove, proximal to wrist crease
Electrode 1 placement
Adductor Polices, distal to the thenar eminence
Electrode 2 placement
On first dorsal interosseous muscle on back of hand
Ground (G) placement
Index Finger
Neuromuscular Blockade means…(simplified)
airway muscles are not ready
Potential Adverse Effects of Residual Neuromuscular Blockade in Postoperative Period
- Need tracheal reintubation
- Impaired oxygenation and ventilation
- Impaired pulmonary function
- Increased risk of aspiration and pneumonia
- Pharyngeal Dysfunction
- Delayed discharge from PACU
Intubation
Endotracheal tube placed down patients throat to assist with breathing. Once intubated, tube is connected to ventilator
Triad of Anesthesia
- Hypnosis
- Analgesia
- Muscle Relaxation
Hypnosis
Put the brain to sleep
Analgesia
Control pain
Muscle Relaxation
Paralytics
NMBA
Neuromuscular Blocking Agents
Neuromuscular Blocking Agents
Administered adjectively to anesthesia to produce paralysis
NMBAs 2-steps
Step 1: Paralyze vocal cords to allow intubation of the trachea
Step 2: Optimize surgical field by inhibiting spontaneous breathing and causing relaxation of the skeletal muscles
2 Types of NMBAs
Depolarizing and Non-Depolarizing Agents
Depolarizing NMBAs
cause rapid depolarization which makes muscle fibers resistant to stimulation by Acetylcholine (Ach)
Duration of Depolarizing agents
rapid (seconds), 7-12min durations
Non-Depolarizing NMBAs
cause total paralysis by blocking the binding of acetylcholine and the inotropic activity of Ach receptors
Duration of Non-Depolarizing NMBAs
takes effect in minutes, lasts 30min-2hr
Depolarizing NMBA examples
Succinylcholine (Anectine)
Non-Depolarizing NMBA examples
Cisatracurium
Pencuronium
Rapacuronium
Miuccuronium
Attracurium
Vecuronium
What reverses non-depolarizing agents
anticholinestease inhibitors
Most popular depolarizing agent
Succinylcholine (anectine)
- does NOT exhibit TOF fade
Which agents will cause TOF fade
Non-depolarizing agents ending in ‘-ium’
Reversal Agents def and examples
any drug used to reverse anesthetics, narcotics, potentially toxic agents
- Suggamedex
- Neostigmine
What is given in combo with Neostigmine
Glycopyrollate
Glycopyrrolate
given to counteract Neostigmine potential cardiac, pulmonary, or gastrointestinal side effects
- an anticholinergic drug
NMJ
Neuromuscular Junction
Neuromuscular Junction
- The synaptic connection between the terminal end of the motor nerve and a muscle
- The site for transmitting action potential from nerve to muscle
- It is the site for many diseases and site of action for many pharmacological drugs
3 main parts NMJ
- Nerve Terminal – presynaptic part
- Motor End Plate – Post synaptic part
- Synaptic Cleft – area between nerve terminal and motor end plate
3 Sites of Stimulation
- Orbicularis Oculi
- Flexor Hallucis Brevis
- Posterior Tibial Nerve
Orbicularis Oculi
Facial muscles surrounding each orbit, primary function to close the eylid
Flexor Hallucis Brevis
Small intrinsic muscle in foot, primary function is to flex big toe and innervated by posterior tibial nerve
Posterior Tibial Nerve
Medial aspect of the ankle between medial malleolus and achilles tendon
AchE
Acetylcholinesterase (aka acetylhydrolase)
Acetylcholinesterase
Is the primary cholinesterase in the body. It is an enzyme that catalyzes the breakdown of acetylcholine into acetate and choline
Ach
Acetylcholine
Acetylcholine
The neurotransmitter used at the NMJ . It is the chemical that motor neurons of the nervous system release to activate muscles
Cholinergic
Inhibit, enhance, or mimic the action of the neurotransmitter Ach, the primary transmitter of nerve impulses within the parasympathetic nervous system. (ie, that part of the autonomic nervous system that contracts smooth muscles and dilates blood vessels, etc.)
nchR
Nicotinic Receptor
Nicotinic Receptor
A type of Ach receptor that responds to nicotine and Ach
- receives Ach and NMBAs
Neuromuscular Activation
- An influx of Ca++ in nerve terminals leads to the release of ACh
- Ach binds nicotinic receptors at the motor end plane and causes depolarization / NA+ entry
- Action potential caused by Na+ depolarizes muscle fibers
Action Potential
The change in electrical potential is associated with the passage of an impulse along the membrane of a muscle cell or nerve cell
TOF
Train of Four
TOFR
Train of Four Ratio
TOFC
Train of Four Count
PTC
Post Tetanic Count
MMG
Mechanomyography
AMG
Acceleromyography
EMG
Electromyography
KMG
Kinemyography