0
Why does the biphasic action potential change into the monophasic action potential after nerve injury between the two recording electrodes?
Wiki User
∙ 14y ago
Think about measures at 3 different time points: when the action potential (AP) crosses the first electrode, when it hits the point of damage, and if undamaged when it crosses the 2nd electrode. You're always measuring the difference between 2 electrodes, R1 and R2.
1. When the AP crosses only the first, you see half of the biphasic profile. In math terms, R1 is larger than R2 and R1 - R2 = AP.
2. When it hits the damage point, the AP stops, since it requires functional biological nerve to propagate. No AP at the first and no AP at the second means R1 - R2 is effectively zero. When combined with 1, you see a monophasic profile.
3. If there's no damage, the AP hits the 2nd electrode. Since you haven't switched any electrodes, R2 is now measuring the AP, and it's larger than R1. R1 - R2 = -AP = the mirror-imaged, 2nd half of the biphasic profile.
Wiki User
∙ 14y ago
Wiki User
∙ 15y agoA nerve is crushed between the two recording electrodes.
Add your answer:
Earn +20 pts
What is biphasic scoliosis?
A Biphasic system means it has two stages, not sure how this relates to Scoliosis, I woulñd go back to the Dr for more information as to what he is referring "biphasic"
How can you tell if bumps on the oscilloscope trace are due to the stimulus artifact or are part of a compound action potential?
The stimulus artifact is biphasic and roughly symmetrical. If you reverse the polarity of the stimulus you will see no or little change in the stimulus artifact but should see a decrease or absence of the neural response. The rate of change in a stimulus artifact is generally an order of magnitude faster than most neural responses so that filtering will disproportionally affect it. Always set your stimulus to lowest strength needed to elicit a response before reversing polarity. If you are on the wrong polarity this has the risk of killing your preparation.
What is the mechanism of phenol during DNA extraction?
Phenol is an organic solvent that creates a hydrophobic environment for proteins to precipitate. The precipitated proteins can later be removed through centrifugation thus allowing the easy isolation of DNA from the cell
What is difference between biphasic and monophasic defibrillators?
biphasic have lower waveform compared to monophasic
What do you call the machine the hospital uses to shock you?
A defibrillator. Can be either monophasic or biphasic.
Is Lexapro mono-phasic or bi-phasic?
Lexapro (or escitalopram as it is known generically) is a selective serotonin reuptake inhibitor (SSRI) often prescribed for depression or anxiety. It is neither monophasic nor biphasic as we usally think of those terms. I suppose you could refer to it as "monophasic" if you are stabilized on a constant dose. Your doctor will often prescribe an initial dose (e.g., 10 mg once daily) that may be increased (e.g., to 20 mg once daily) after a short period of use. Monophasic, biphasic, and triphasic designations usally refer to oral contraceptive pills in which the dosage of the pill pack varies (or not) throughout the three weeks prior to the week of placebo pills that all a woman to have her period. Monophasic pills have the same level of hormone (estrogen and progesterone) in each pill throughout the three week period. Biphasic pills vary the amount of hormone in each pill once during the three week period, and triphasic pills change the amount of hormone in each pill once weekly. I hope this helps to answer your question.
What is biphasic scoliosis?
A Biphasic system means it has two stages, not sure how this relates to Scoliosis, I woulñd go back to the Dr for more information as to what he is referring "biphasic"
What is biphasic titration?
bapa banda
What is DC shock and its types?
DC shock, or using it's full name, DCCS (Direct Current Counter Shock) is the process of delivering an electrical shock to the heart muscle. This medical procedure is commonly referred to as defibrillation and is generally only performed to correct potentially life-threatening arrythmias such as Vf (ventricular fibrillation) or VT (ventricular tachycardia). The two most common types of defibrillation are monophasic and biphasic. To perform external defibrillation (the kind you see on medical drama shows - "CLEAR" ... ) two electrical pads are placed on the chest. One on the right side of the chest, just below the collar bone and the other on the left side of the chest, near the base of the ribs and almost in line with the armpit. In monophasic defibrillation the electricity flows from the right pad, through the chest and the heart to the left pad. In biphasic defibrillation, electricity is directed from the right pad, through the chest to the left pad and then immediately back through the chest again to the right pad. Biphasic defibrillation is generally accepted to be more effective in stopping life-threatening arrythmias and requires a lesser amount of energy to achieve this. (150-200 joules compared to 300-360 joules in an adult).
What is an irregular mixture?
You think probable to a non homogeneous mixture - a mixture which is biphasic and the components are distributed irregularly.
When assisting in a cardioversion of ventricular tachycardia via biphasic defriillation you can expect the starting energy range to e?
200
The joules for biphasic defibrillator cardioversion?
The starting joules should be 100-120. This will generally result in 90% first shock success in patients with persistent A-Fib.
How is altered body temperature related to dengue fever?
feverish because of viremia..usually in a biphasic pattern or saddle-back pattern.it is an acute fever and may also comes with a chill.
Why do people get the hiccups when they are drunk?
Ethyl alcohol (the alcohol in drinks) causes whats called biphasic effect on nerves of tongue, pharynx and diaphragm (generally on respiration). long story short, alcohol irritates nerves, causing hiccups.
What is the output voltage of a defibrillator?
It depends! The older Monophasic (one shock per shock -one way) machines can use as much as 5000V. The newer Biphasic (two shocks per shock -back and forth) machines use around 2200V. Less energy= less heart damage risk. Now to some details: The energy output of these machines is termed in Joules. Usually something like 150J for a Biphasic or 200J in a Mono as a first shock. The critical part is that Joules are a product of the Voltage * Amperage * time (1 sec). Therefore in the above examples : 1500V * 0.1A * 1sec = 150J 2000V * 0.1A * 1 sec= 200J The high voltage is generated by converting either the mains power or the internal battery power to the required voltage via an inverter and then stored in a capacitor for rapid release when needed. As an example, cars usually run on a 12V system, BUT the energy sent to the spark plug from the ignition coil is massive and dangerous for a very short time, as is the energy during defibrillation. So, don't think your gloves will save you. Don't touch the patient when shocking them -as in don't continue compressions when shocking them. There is no such thing as an energy rated safe disposable medical glove. Hope this helps.
