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The hexaxial reference system is a diagram that is used to determine the heart's electrical axis in the frontal plane.. In electrocardiography, left axis deviation (LAD) is a condition wherein the mean electrical axis of ventricular contraction of the heart lies in a frontal plane direction between −30° and −90°.
A macron (/ ˈ m æ k r ɒ n, ˈ m eɪ-/ MAK-ron, MAY-) is a diacritical mark: it is a straight bar ¯ placed above a letter, usually a vowel.Its name derives from Ancient Greek μακρόν (makrón) 'long' because it was originally used to mark long or heavy syllables in Greco-Roman metrics.
Characterizing the size of the left atrium according to its volume is preferred over a single linear dimension since enlargement can be different for different directions. For example, because of the smaller distance in the thoracic cavity between the sternum and spine , compared to the other directions, less room exists for enlargement of the ...
Macron below is a combining diacritical mark that is used in various orthographies. [1]A non-combining form is U+02CD ˍ MODIFIER LETTER LOW MACRON.It is not to be confused with U+0320 ̠ COMBINING MINUS SIGN BELOW, U+0332 ̲ COMBINING LOW LINE and U+005F _ LOW LINE.
Combining Diacritical Marks is a Unicode block containing the most common combining characters.It also contains the character "Combining Grapheme Joiner", which prevents canonical reordering of combining characters, and despite the name, actually separates characters that would otherwise be considered a single grapheme in a given context.
A blood volume increase would cause a shift along the line to the right, which increases left ventricular end diastolic volume (x axis), and therefore also increases stroke volume (y axis). The Frank–Starling law of the heart (also known as Starling's law and the Frank–Starling mechanism ) represents the relationship between stroke volume ...
The mean, normal SA in healthy young adult females and males is 66° and 80°, respectively, [9] and very similar magnitudes are found in the elderly population (65 years and older). [10] In ECG analysis, the SA is categorized into normal (below 105°), borderline abnormal (105–135°) and abnormal (greater than 135°). [ 11 ]
The pressures where there is a steep relationship lie within the normal range of right atrial pressure (RAP) found in the healthy human during life. This range is about -1 to +2 mmHg . The higher pressures normally occur only in disease , in conditions such as heart failure , where the heart is unable to pump forward all the blood returning to ...