Postural orthostatic tachycardia syndrome
Alina Vilkė, Justina Mikšaitė, Andrius Macas Abstract Orthostatic intolerance defines a group of symptoms characterized by cerebral hypoperfusion and/or sympathetic activation that appear on standing upright and remit in the supine position. Patients may complain of headache, nausea, abdominal pain, lightheadedness, diminished concentration, syncope, anxiety, weakness, fatigue, exercise intolerance, palpitations, dyspnea, and chest pain. POTS…