Conduction Blocks

Question: could any one tell about the disease multifocal motor nerve conduction blocks is there any treatment for cure my father has been suffering from this disease from the past 2 years , it has increased slowly from finger and now entire body is affected.we have spent so much of money for his treatment but rather it grew worse.can any one suggest any doctor or hospital for his complete treatment.

Answer: well ur father needs consultation with a neurologist... divya are u from india?its very costly treatment....without insurance i may say Most patients maintain productive lives despite ongoing symptoms, and up to 94% remain employed. Gradual progression of symptoms may lead to significant disability. MMN is an immune-mediated disorder, and while multiple immunomodulatory and immunosuppressive treatments have been used, only intravenous IVIG and cyclophosphamide have been consistently effective. Anecdotal reports also indicate that rituximab, interferon-beta, azathioprine, and cyclosporine may be efficacious. Cyclophosphamide may be used in combination with plasmapheresis. Corticosteroids or plasmapheresis (without cyclophosphamide) is not effective, and in some cases, MMN may even worsen. Recent reports describe effective treatment with cyclosporine and rituximab in a small number of patients, but additional data are needed before these would be recommended for treatment of MMN. Other treatments used with variable success include interferon-beta and azathioprine. * Most patients are treated as outpatients, although they may have to be admitted with severe exacerbations. Further Outpatient Care: * Outpatient care consists of clinic visits to neurologists, physiatrists, and occupational and physical therapists. In/Out Patient Meds: * IVIG infusions are usually administered on an outpatient basis in the physician's office or at home. * Prognosis is usually good, and 70-80% of patients respond to treatment. Even in patients who do not respond to therapy, weakness is only slowly progressive and up to 94% of patients remain employed.

Question: Can someone explain the difference in Cardiac Blocks? I am taking the CCT soon, and need come clarrification on the difference between 1st degree 2nd degree and 3rd degree blocks in the cardiac conduction. I just wanted to add, that I want to know the difference in the P waves, and where they fall.

Answer: First degree- the PR interval is longer than 0.20 seconds (one large box on the EKG scale paper.) There will always be one P wave for every QRS...a 1:1 ratio. The signal from the atria is slow in reaching the ventricle. Second degree - Type 1: the PR interval starts short and get a bit longer before each QRS complex until there is a P wave without a QRS after it. Then it resets itself and starts short again, progressively getting longer until it drops another QRS complex, repeating this pattern. Calipers are helpful here.The AV node cannot conduct the signals as fast as the atria are sending them. Secong degree-type 2: the PR interval does not get longer,and it appears to be a 1:1 ratio, but then the QRS complex disappears occasionally. There will be a P wave followed by a QRS complex for several beats, then only P waves, then the QRS will return. The AV node conducts the signal through, but the signal is stopped in the Purkinje system and does not reach the ventricles. Third Degree- There is no correlation of P waves to QRS complexes. Calipers are helpful here. The P waves will march out at regular times, and the QRS's will march out at regular times, but there is no correlation between either. The PR interval will appear erratic from beat to beat, sometimes short, then long, then not there at all. This happens because the atrial signals are not reaching the ventricles at all. Each are beating independently of each other.

Question: A patient has an AV node conduction block in his heart. What will happen? A. both the atria and ventricles will contract B. The atria will contract, but not the ventricles C. The ventricles will contract, but not the atria D. Neither the atria nor the ventricles will contract

Answer: The answer is A. The heart will still continue to beat but the rate of the atria, and the ventricles will differ. this is called heart block, and pacemakers are implanted in many cases just for this.

Question: conduction of action potentials is lost when myelinated axons lose myelin in demyelinating diseases. Why? unmyelinated axons conduct action potentials without decrement, but when myelinated axons lose myelin in demyelinating diseases such as multiple sclerosis, conduction of action potentials is blocked. Why?

Answer: The key difference is that unmyelinated axons have voltage-gated sodium channels throughout the length of the axon so they can continue to propagate the action potential down the axon. Myelinated axons however only have voltage-gated sodium channels at the nodes of ranvier which are small areas in-between the myelin sheaths covering the axon. Myelin sheaths actually increase the speed of the axon potential conductance and the Nodes of Ranvier renews the strength of the Action Potential so it can go on its away again. If myelinated neurons are losing their myelin then the Action Potential can not reach the next Nodes of Ranvier so it can not be rejuvenated and the neuron can no longer conduct electrical signals throughout the length of the axon.

Question: Since lead blocks radiation, does that mean it resists heat as well? I would guess lead would still be able to take up heat by conduction and convection, but since sunlight is a form of electromagnetic radiation, does that mean it would resist the heat produced by the sun?

Answer: Are you a complete idiot?

Question: Does Medicare cover IVIG treatments for Multifocal Motor Neuropothy? My FIL has Medicare Part F and we need to know if it will cover his IVIG treatments for multifocal motor neuropothy (with a conduction block) that he has once a month, for 5 days, as an outpatient in a hospital.

Answer: The treatment center can give you the definite answer. I believe it will. I have MS and Medicare covers IV treatments for me.

Question: calculating the heat absorbed and heat released? A 12.0 gram block of wood is burned under a container of 30.0 grams of water. Make the assumption that all the heat given off by the burning wood is transferred directly to the water via conduction and convection. The initial temperature of the water is 25.0 °C and the final temperature of the water is 30.0 °C. Calculate the heat absorbed by the water. Show all calculations including formulas and units of measure. Calculate the heat released per gram of wood. Show all calculations including formulas and units of measure.

Answer: _____Calorimetry heat released = heat gained heat gained = 4.18 J/gC * 30.0 g * (30.0- 25.0)C = ?? heat released per gram = heat gained by water / 12.0 g wood = ?? Plug and SOLVE Basic mathematics is a prerequisite to chemistry – I just try to help you with the methodology of solving the problem.

Question: People fighting forest fires carry emergency tents that have shiny aluminum outer surfaces.? If there is trouble, a fire fighter can lie under the tent to block the heat from burning trees overhead. The tent helps because... both conduction and radiation carry heat downward toward the fire fighter and the aluminum tent blocks most of that heat. only radiation carries heat downward toward the fire fighter and the aluminum tent reflects most of that radiation. only conduction carries heat downward toward the fire fighter and the aluminum tent conducts that heat harmlessly into the ground. only convection carries heat downward toward the fire fighter and the aluminum tent blocks most of the heat carried by convection.

Answer: Radiation is the best answer to your question? I'm a firefighter and this is the correct answer! here is a source you can check out! and it's not a tent it's an emergency blanket! Remember radiation is just like the sun!

Question: Some heat insulation/conduction questions ...? 1.Are the following items conductors or insulators of heat : bubble wrap, metal taps, copper pipes, duck feathers, brass door handles, wool carpet, wooden door 2.These are some of the house's features and the status they are in : chimney - not used and so blocked up loft - glass fibre over aluminum foil windows - double glazed, thick curtains doors and windows - draugh exculders walls- cavity wall insulating foam a.write down all the insulating methods used in the house that use TRAPPED AIR. b.Write down the insulating methods that stop air moving. Thanks to all those who answer this question.

Answer: its 4 45am here... right. metals conduct heat organic material doesnt well the chimney isnt blocked is it? it has a flue and liner... for airflow, or your gas fire would produce carbon monoxide and kill you all... (believe me) and apart from the chimney, everything on your list uses trapped air one way or another. Its trapped in layers, or between a physical barrier... which acts as a buffer zone. you cant stop air moving (double gazing being an exception) ... if we trap air we grow black mould... where does the condensation go? if we trap air and stop it moving your fire wont burn properly...it needs an incredible ammount of air to burn properly... and now, its time for bed.. itll be dawn in about an hour or so...

Question: I am 11 year old and during svt heart aplation dr. accidently damage my AV nodes and put pacemaker.? dr. told i need time for recovery. already 6 month pass and I still have heart block no conduction.?

Answer: unfortunately, this is one of the risks of this procedure and I assume they told you & your parents this when they were getting consent to do the ablation. If what they are ablating is close to the AV node, there is always a risk that you may end up with a pacemaker.