Severe vasoconstriction may cause symptoms of intermittent claudication. External Cardiotocography can be used for continuous or intermittent monitoring. Antihistamines by mouth are suitable for occasional use with mild intermittent symptoms. Severe vasoconstriction may result in symptoms of intermittent claudication. A constant waveform generates more heat than intermittent. Mild and intermittent symptoms often resolve spontaneously. This can be due to impairment of mitochondrial oxidative metabolism under constant or intermittent stretching. Micropulse systems utilize intermittent bursts of energy. An example of "irregular" intermittent (irregularly irregular) pulse is atrial fibrillation. Thereafter shooting was done only in intermittent bursts. Examples of "regular" intermittent (regularly irregular) pulse include pulsus bigeminus, second-degree atrioventricular block. Urinary tract infection is the most common complication of intermittent catheterization. GBS colonization may be permanent, intermittent or temporary. Pain can be present on an intermittent or permanent basis. It may also cause intermittent double vision.