Causes of Orthostatic Hypotension
Aug 01, 2022
Source: Cainiu Health
Dr. Li Man
Introduction
Patients presenting with this condition may undergo diagnostic procedures such as the upright tilt test. Most patients experience symptoms including syncope and palpitations before seeking medical attention. Following clinical evaluation—including blood pressure monitoring in both supine and standing positions—a diagnosis of orthostatic hypotension can be established; however, routine blood pressure measurements alone are insufficient for diagnosis. Therefore, patients may undergo orthostatic testing and other relevant diagnostic assessments.
Orthostatic hypotension is relatively uncommon in clinical practice. Its primary manifestation is a marked drop in blood pressure upon assuming an upright posture. So, what causes orthostatic hypotension?
Causes of Orthostatic Hypotension
Patients with this condition may undergo diagnostic procedures such as the tilt-table test. Most affected individuals experience symptoms including syncope (fainting) and palpitations, prompting them to seek medical attention. Diagnosis relies on comparing blood pressure measurements taken while lying down versus standing—standard office blood pressure readings alone are insufficient for diagnosis. Therefore, patients should undergo orthostatic testing and other relevant evaluations. In most cases, medications are the underlying cause. For instance, antihypertensive drugs are a common culprit; orthostatic hypotension may also occur following treatment with medications for benign prostatic hyperplasia. Diabetic patients are likewise prone to this condition, which is highly prevalent among them. Some patients develop orthostatic hypotension after initiating antihypertensive therapy for elevated blood pressure and subsequently experience fainting episodes postprandially. In hospitalized patients, blood pressure may plummet markedly upon assuming a supine position; however, once antihypertensive agents are discontinued, blood pressure typically returns to normal.
Orthostatic hypotension is also influenced by internal environmental factors. Impaired physiological homeostasis is a frequent clinical finding, affecting approximately 15–20% of older adults. Its prevalence increases with advancing age, cardiovascular disease, and elevated baseline blood pressure. Many elderly individuals exhibit substantial blood pressure fluctuations upon postural change, particularly correlating with supine systolic blood pressure levels. The greatest decline in systolic blood pressure upon standing tends to occur when supine systolic pressure is markedly elevated. Orthostatic hypotension is a serious condition and represents one of the most dangerous causes of syncope and falls in the elderly—even in the absence of autonomic nervous system dysfunction.
Excessive sweating leading to dehydration—and consequently reduced effective circulating blood volume—can also trigger orthostatic hypotension. We hope this information proves helpful.
