Editing Orthostatic hypotension (section)

=== Subcategories ===
Orthostatic hypotension can be subcategorized into three groups – initial, classic, and delayed.<ref name="Wieling_2007">{{cite journal | vauthors = Wieling W, Krediet CT, van Dijk N, Linzer M, Tschakovsky ME | title = Initial orthostatic hypotension: review of a forgotten condition | journal = Clinical Science | volume = 112 | issue = 3 | pages = 157–165 | date = February 2007 | pmid = 17199559 | doi = 10.1042/CS20060091 }}</ref><ref name="Moya_2009">{{cite journal | vauthors = Moya A, Sutton R, Ammirati F, Blanc JJ, Brignole M, Dahm JB, Deharo JC, Gajek J, Gjesdal K, Krahn A, Massin M, Pepi M, Pezawas T, Ruiz Granell R, Sarasin F, Ungar A, van Dijk JG, Walma EP, Wieling W | display-authors = 6 | title = Guidelines for the diagnosis and management of syncope (version 2009) | journal = European Heart Journal | volume = 30 | issue = 21 | pages = 2631–2671 | date = November 2009 | pmid = 19713422 | pmc = 3295536 | doi = 10.1093/eurheartj/ehp298 }}</ref><ref name="Gibbons_2006">{{cite journal | vauthors = Gibbons CH, Freeman R | title = Delayed orthostatic hypotension: a frequent cause of orthostatic intolerance | journal = Neurology | volume = 67 | issue = 1 | pages = 28–32 | date = July 2006 | pmid = 16832073 | doi = 10.1212/01.wnl.0000223828.28215.0b | s2cid = 33902650 }}</ref>

Initial orthostatic hypotension is frequently characterized by a systolic blood pressure decrease of ≥40 mmHg or diastolic blood pressure decrease of ≥20 mmHg within 15 seconds of standing.<ref name="Wieling_2007" /> Blood pressure then spontaneously and rapidly returns to normal, so the period of hypotension and symptoms is short (<30 s).<ref name="Wieling_2007" />  Only continuous beat-to-beat BP measurement during an active standing-up maneuver can document this condition.<ref name="Wieling_2007" />

Classic orthostatic hypotension is frequently characterized by a systolic blood pressure decrease of ≥20 mmHg or diastolic blood pressure decrease of ≥10 mmHg between 30 seconds and 3 min of standing.<ref name="Moya_2009" />

Delayed orthostatic hypotension is frequently characterized by a sustained systolic blood pressure decrease of ≥20&nbsp;mm Hg or a sustained diastolic blood pressure decrease ≥of 10&nbsp;mm Hg beyond 3 minutes of standing or upright tilt table testing.<ref name="Gibbons_2006" />