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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°.
In Old English texts a macron above a letter indicates the omission of an m or n that would normally follow that letter. In older handwriting such as the German Kurrentschrift, the macron over an a-e-i-o-u or ä-ö-ü stood for an n, or over an m or an n meant that the letter was doubled. This continued into print in English in the sixteenth ...
A macron is a diacritic ¯ placed over a vowel originally to indicate that the vowel is long. When editing a Wikipedia page, macron characters appear below the edit box, and can be inserted into the edit box by clicking the appropriate character (in JavaScript-enabled browsers). A macron can also be input directly from the keyboard.
A with macron and macron: Kienning Colloquial Romanized transliteration Ā̆ ā̆: A with macron and breve: Latin, Middle High German, Proto-Indo-European Ā̆́ ā̆́: A with macron, breve and acute: Latin Ā̈ ā̈: A with macron and diaeresis: Svan transliteration Ā̊ ā̊: A with macron and ring above: Avestan transliteration Ā̌ ā̌: A ...
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.
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.
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 ...
If lead I is positive (translating to 0° on the hexaxial reference system) and lead II is positive (translating to 60°), the electrical heart axis is estimated to fall in the left lower quadrant within the normal range. On the other hand, as shown in Figure 2, if lead I is negative (translating to 180°) and lead II is positive, the ...