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Why does the biphasic action potential change into the monophasic action potential after nerve injury between the two recording electrodes?
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.
What else can I help you with?
What is biphasic scoliosis?
Biphasic scoliosis is a type of spinal curvature that progresses in two phases during a child's growth. It typically presents as a single curve that changes in severity and direction over time, first becoming worse and then partially self-correcting as the child grows. Treatment may involve observation, bracing, or surgery depending on the severity and progression of the curve.
What is a biphasic response to alcohol?
A biphasic response to alcohol refers to the two distinct phases of effects experienced after consumption. Initially, low to moderate doses of alcohol often produce stimulating effects, such as increased sociability and euphoria. However, as blood alcohol concentration continues to rise, the effects shift to sedative outcomes, including impaired coordination, lethargy, and decreased cognitive function. This response can vary among individuals based on factors like tolerance, genetics, and drinking context.
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.
What is the difference of a monophasic and biphasic defibrillators?
Monophasic defibrillators deliver a single electrical shock in one direction to the heart, while biphasic defibrillators deliver shocks that travel in two directions, typically from one electrode to another and then back again. Biphasic defibrillators are generally more effective at restoring normal heart rhythm with lower energy levels, which reduces the risk of damage to the heart muscle. As a result, biphasic devices have become the standard in modern defibrillation practices.
What are biphasic waves?
Biphasic waves are electrical signals that alternate in direction, oscillating between positive and negative phases. They are commonly seen in certain types of medical devices, such as defibrillators, where they are used to deliver a controlled shock to the heart to restore normal rhythm. Biphasic waves are believed to be more effective and safer than monophasic waves for cardioversion.
What are the potential causes of biphasic T wave changes on an electrocardiogram?
Potential causes of biphasic T wave changes on an electrocardiogram include myocardial ischemia, electrolyte imbalances, drug effects, and certain cardiac conditions such as hypertrophic cardiomyopathy.
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 the significance of biphasic T waves in the context of cardiac health?
Biphasic T waves in an electrocardiogram (ECG) can indicate potential heart issues. They may suggest abnormalities in the heart's electrical activity, which could be a sign of heart disease or other cardiac conditions. Monitoring and further evaluation by a healthcare provider is recommended if biphasic T waves are observed.
What are the potential implications of a biphasic T wave in an ECG reading?
A biphasic T wave in an ECG reading can indicate various heart conditions, such as electrolyte imbalances, myocardial ischemia, or drug effects. It may suggest an increased risk of arrhythmias or cardiac events, requiring further evaluation and monitoring by a healthcare provider.
What is the significance of a biphasic T wave on an electrocardiogram and how does it impact the interpretation of cardiac health?
A biphasic T wave on an electrocardiogram can indicate potential heart issues. It is when the T wave has both positive and negative components. This abnormality can suggest conditions like myocardial ischemia or electrolyte imbalances. It may impact the interpretation of cardiac health by signaling the need for further testing or monitoring to assess the heart's function and potential risks.
What are the potential causes and implications of a biphasic T wave on an electrocardiogram?
A biphasic T wave on an electrocardiogram can be caused by various factors such as electrolyte imbalances, heart conditions, or medication side effects. This abnormality may indicate an increased risk of cardiac events like arrhythmias or heart attacks. It is important to consult a healthcare provider for further evaluation and management.
What is biphasic scoliosis?
Biphasic scoliosis is a type of spinal curvature that progresses in two phases during a child's growth. It typically presents as a single curve that changes in severity and direction over time, first becoming worse and then partially self-correcting as the child grows. Treatment may involve observation, bracing, or surgery depending on the severity and progression of the curve.
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).
