Presentation description

Orthostatic Intolerance (OI) manifests as symptoms like nausea, headache, and dizziness upon moving from lying to standing up. Postural Orthostatic Tachycardia Syndrome (POTS) and Orthostatic Hypotension (OH) are specific types of OI that can significantly impact quality of life. Testing for OI typically involves three methods: the Head-Up Tilt Table test, Passive Standing test, and Active Standing test. These tests monitor changes in heart rate (HR) and blood pressure (BP), alongside symptom development while standing. The Head-Up Tilt Table test, requiring specialized equipment, is less accessible outside of specialty centers and the Active Standing test demands independent standing, posing challenges for patients with severe OI. In contrast, the Passive Standing test was developed as a compromise, supporting patients as they lean against a wall while physiological data is recorded (changes in HR and BP). We aim to compare the diagnostic and physiological outcomes of the Passive and Active Standing tests, given their differing levels of physical exertion and accessibility, to find agreement between the two methods. We hypothesize that the variability in how patients lean against the wall during the Passive Standing test may lead to discrepancies compared to the Active Standing test, where patients support themselves independently. Thus leading to no "agreement". Finding that these tests yield similar results could imply interchangeability in clinical practice, depending on clinician preference or specific clinical circumstances. Understanding these differences is crucial for optimizing OI diagnosis and management.