sa node sentence in Hindi
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- In addition to the above blocks, the SA node can be suppressed by any other arrhythmia that reaches it.
- Tbx18 turns on genes that drive SA node cell development, simultaneously turning off genes that create atrial muscle cells.
- If the SA node fails to initialize, the AV junction can take over as the main pacemaker of the heart.
- The problem in sick sinus syndrome is that the SA node is not functioning properly and is causing an irregular heartbeat.
- Stimulation of the vagus nerves cause a " decrease " in the SA node rate, decreasing the heart rate.
- These converted SA node cells are able to respond to the nervous system, allowing the heart to be regulated as normal.
- Indeed, since the sinus venosus is incorporated into the right atrium in amniotes, it is likely homologous with the SA node.
- The other foci attempt to fire at their intrinsic rate, but they are activated by the SA node before they can fire.
- The total time elapsed from the initiation of the impulse in the SA node until depolarization of the ventricles is approximately 225 ms.
- Although they make up a relatively small portion of the heart SA node cells play a crucial role in the heart s function.
- The SA node receives several different inputs and the instantaneous heart rate or RR interval and its variation are the results of these inputs.
- Sometimes an ectopic pacemaker sets the pace, if the SA node is damaged or if the electrical conduction system of the heart has problems.
- The escape arrhythmia is a compensatory mechanism that indicates a serious underlying problem with the SA node or conduction system ( commonly due to syncope.
- Tbx18 gene therapy has been successful in rodent hearts, converting atrial muscle cells into SA node cells by expression of the Tbx18 transcription factor.
- When atrial fibrillation occurs, several areas of the heart other than the SA node send signals to the atria in a rapid and chaotic manner.
- These cells are found in the conduction system of the heart and include the SA node, AV node, Bundle of His and Purkinje fibers.
- The AV node's normal intrinsic firing rate without stimulation ( such as that from the SA node ) is 40-60 times / minute.
- Ordinarily, the SA node, or natural pacemaker of the heart, sends an electrical signal that causes contraction of the atria, or upper heart chambers.
- Stimulation sympathetic fibers of the spinal nerves causes an " increase " in the SA node rate, increasing the heart rate and force of contraction.
- Since this accessory pacemaker also activates independently of the impulse generated at the SA node, two independent rhythms can be noted on the electrocardiogram ( ECG ).
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