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Refractory period is a period immediately following a stimulus during which further stimulation has no effect. It may specifically refer to: Refractory period (physiology), recovery time of an excitable membrane to be ready for a second stimulus once it returns to its resting state, following excitation in the areas of biology, physiology and cardiology
This period of time is referred to as the refractory period, which is 250ms in duration and helps to protect the heart. In the classical sense, the cardiac refractory period is separated into an absolute refractory period and a relative refractory period. During the absolute refractory period, a new action potential cannot be elicited.
The afterhyperpolarisation is one of the processes that contribute to the refractory period. Afterhyperpolarization, or AHP, is the hyperpolarizing phase of a neuron's action potential where the cell's membrane potential falls below the normal resting potential. This is also commonly referred to as an action potential's undershoot phase. AHPs ...
The symptoms of CDD include early infantile onset refractory epilepsy; hypotonia; developmental, intellectual, and motor disabilities, with little or no speech; and cortical visual impairment. [1] Patients usually present first with seizures within the first months of life, followed by infantile spasms which progress to epileptic seizures that ...
Neurons naturally become hyperpolarized at the end of an action potential, which is often referred to as the relative refractory period. Relative refractory periods typically last 2 milliseconds, during which a stronger stimulus is needed to trigger another action potential. Cells can also become hyperpolarized depending on channels and ...
Shock is the state of insufficient blood flow to the tissues of the body as a result of problems with the circulatory system.Initial symptoms of shock may include weakness, tachycardia, hyperventilation, sweating, anxiety, and increased thirst. [1]
Recrudescence is the recurrence of an undesirable condition. In medicine, it is usually defined as the recurrence of symptoms after a period of remission or quiescence, [1] [2] [3] in which sense it can sometimes be synonymous with relapse.
Metabolic acidosis is a serious electrolyte disorder characterized by an imbalance in the body's acid-base balance.Metabolic acidosis has three main root causes: increased acid production, loss of bicarbonate, and a reduced ability of the kidneys to excrete excess acids. [5]