Does an ECG show abnormalities when I have postural orthostatic tachycardia syndrome?

Hello doctor,

I have a recent diagnosis of postural orthostatic tachycardia syndrome. The symptoms are not recent and date back 30 years. They have worsened during periods of iron deficiency anemia. My echocardiogram taken seven years back was almost entirely normal, with an ejection fraction of 55% at that time. Other than very mild mitral valve regurgitation, nothing unusual was present. My echocardiogram recently has eccentric hypertrophy of the left ventricle and a 74 % ejection fraction. Most other readings, particularly the specific pressure readings in various areas listed on the echo, are now outside the normal range. I have been told to keep hydrated. I am consuming four liters of water with added electrolytes daily. In addition, I have been advised to do rowing to strengthen my heart. I have been doing rowing exercises as part of my physical therapy for thoracic outlet syndrome since two. From journal articles I have read, I know cardiac remodeling occurs in response to chronic iron deficiency. I want to speak with someone who knows how to read an echocardiogram and will explain, in detail, why the changes have occurred and the appropriate course of treatment. Thank you. I am diagnosed with Ehlers-Danlos Syndrome, hypermobile type, and postural orthostatic tachycardia syndrome. I have tachycardia when standing, nausea, the reddish-purple color of my legs when standing and after a hot bath, breathlessness, and narrowed visual field when standing up. I have been with these issues since my teens. These issues worsen dramatically when I am iron deficient - shown by ferritin in single digits - or fully anemic. Currently, I am taking Propranolol 10 mg, Prazosin 1mg at bedtime, and Celebrex 200mg, and I have undergone two echocardiograms, two stress tests, a 7-day Holter monitor, tilt table test, and a QSART test.