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The QT interval is a measurement made on an electrocardiogram used to assess some of the electrical properties of the heart.It is calculated as the time from the start of the Q wave to the end of the T wave, and approximates to the time taken from when the cardiac ventricles start to contract to when they finish relaxing.
Junctional rhythm is seen equally in men and women, and can be seen intermittently in young children and athletes, especially during sleep. It occurs commonly in patients with sinus node dysfunction. 1/600 cardiology patients over the age of 65 have sinus node dysfunction. [1]
Long QT syndrome (LQTS) is a condition affecting repolarization (relaxing) of the heart after a heartbeat, giving rise to an abnormally lengthy QT interval. [7] It results in an increased risk of an irregular heartbeat which can result in fainting, drowning, seizures, or sudden death. [1]
Unstable means that either important organ functions are affected or cardiac arrest is about to occur. [10] Stable means that there is a tachycardia, but it does not seem an immediate threat for the patient's health, but only a symptom of an unknown disease, or a reaction that is not very dangerous in that moment.
ECG signals can be recorded in other contexts with other devices. In a conventional 12-lead ECG, ten electrodes are placed on the patient's limbs and on the surface of the chest. The overall magnitude of the heart's electrical potential is then measured from twelve different angles ("leads") and is recorded over a period of time (usually ten ...
The American Heart Association hosts an annual Red Dress Collection Concert to help raise awareness and funds for women's heart health research. While you may not be able to attend the event, you ...
The Cornell voltage criteria [13] for the ECG diagnosis of LVH involve measurement of the sum of the R wave in lead aVL and the S wave in lead V 3. The Cornell criteria for LVH are: S in V 3 + R in aVL > 28 mm (men) S in V 3 + R in aVL > 20 mm (women) The Romhilt-Estes point score system ("diagnostic" >5 points; "probable" 4 points):
Women and those who are young may show abnormalities on their test even though no signs of coronary ischemia or CAD are present. [29] Harmless arrhythmias present at baseline may distort the results. [11] Diagnosis of coronary artery disease is missed in 37% of men and 18% of women with a negative test. [33]