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Hyperkalemia is an elevated level of potassium (K +) in the blood. [6] [1] Normal potassium levels are between 3.5 and 5.0 mmol/L (3.5 and 5.0 mEq/L) with levels above 5.5 mmol/L defined as hyperkalemia. [3] [4] Typically hyperkalemia does not cause symptoms. [1] Occasionally when severe it can cause palpitations, muscle pain, muscle weakness ...
The last half of the T wave is referred to as the relative refractory period or vulnerable period. The T wave contains more information than the QT interval. The T wave can be described by its symmetry, skewness, slope of ascending and descending limbs, amplitude and subintervals like the T peak –T end interval. [1] In most leads, the T wave ...
The diagnosis of hypokalemia (not enough potassium) can be suspected when there is a history of diarrhoea or malnutrition. Loop diuretics may also contribute. The electrocardiogram may show flattening of T waves and prominent U waves. Hypokalemia is an important cause of acquired long QT syndrome, and may predispose the patient to torsades de ...
The earliest sign is hyperacute T waves, peaked T waves due to local hyperkalemia in ischemic myocardium. This then progresses over a period of minutes to elevations of the ST segment by at least 1 mm. Over a period of hours, a pathologic Q wave may appear and the T wave will invert. Over a period of days the ST elevation will resolve.
Peaked T-waves signifying faster repolarization and potentially instances of early-repolarization and phase 2 re-entry (Brugada, Short QT, and Early-Repolarization Syndromes) are evident in the first phase of hyperkalemia. [46]
Microvolt T wave alternans is a variant of T wave alternans that detects T wave alternans signals as small as one-millionth of a volt. Microvolt T wave alternans is defined as an alternation in the morphology of the T wave in an every other beat or AB-AB pattern. It has long been associated with ventricular arrhythmias and sudden death.
Torsades de pointes, torsade de pointes or torsades des pointes (TdP; also called torsades) (/ t ɔːr ˌ s ɑː d d ə ˈ p w æ̃ t /, [2] French: [tɔʁsad də pwɛ̃t̪], translated as "twisting of peaks") is a specific type of abnormal heart rhythm that can lead to sudden cardiac death.
The diagnosis is supported by a urine test strip which is positive for "blood" but the urine contains no red blood cells when examined with a microscope. [3] Blood tests show a creatine kinase activity greater than 1000 U/L, with severe disease being above 5000–15 000 U/L. [5] The mainstay of treatment is large quantities of intravenous ...