Orthostatic Hypotension

Orthostatic hypotension, also referred to as postural hypotension, signifies a noticeable decline in blood pressure at an upright body position. Within the clinical understanding, the diagnosis hinges on the consistent reduction in systolic blood pressure by a minimum of 20 mmHg or diastolic blood pressure by 10 mmHg during the initial three minutes of standing, following a period of supine rest for five minutes. This transition from supine to standing introduces a notable pooling of blood, ranging from approximately 300 mL to 800 mL within the lower extremities due to the gravitational forces in play. This rapid influx culminates in diminished venous return to the heart, subsequently leading to a decrease in overall cardiac output.
The genesis of orthostatic hypotension can be traced back to an inadequate physiological response to shifts in blood pressure upon transitioning to an upright position. Its manifestations can encompass a spectrum of symptomatic or asymptomatic presentations, while also presenting as acute or chronic scenarios. The classification divides this pathology in 2 categories: the "Classic" orthostatic hypotension (within 3 min in a standing position), and the "Delayed" orthostatic hypotension, which manifests after the passage of three minutes. Two extensive population-based studies conducted within the United States, found that the prevalence of orthostatic hypotension changes across age cohorts. This condition is encountered in less than 5% of individuals aged between 45 and 49 years, exhibits a prevalence of approximately 15% in the demographic spanning 65 to 69 years, and manifests in more than 25% of those surpassing the age of 85.
The management course for patients with orthostatic hypotension is tailored to align with its etiological origins. The paramount therapeutic objective centers on alleviating symptomatic discomfort and averting correlated morbidity. Healthcare providers should educate patients, encompassing the nature of orthostatic hypotension, its triggers, and aggravating factors. Notably, symptoms are prone to exacerbation in conditions like prolonged standing, consumption of large meals, dehydration, alcohol consumption, elevated ambient temperatures, as well as exposure to hot baths or showers.