Orthostatic haemodynamic responses in acute stroke

Area of Science:

• Neurology
• Cardiovascular Physiology

Background:

• Orthostatic blood pressure regulation is poorly understood in acute stroke patients.
• Understanding hemodynamic responses is crucial for safe early mobilization and rehabilitation.

Purpose of the Study:

• To investigate postural hemodynamic responses in acute stroke patients.
• To compare these responses with non-stroke controls at two time points post-admission.
• To assess the risk of detrimental postural blood pressure reductions during early mobilization.

Main Methods:

• 40 acute stroke patients (mild-moderate severity) and 40 controls underwent postural change tests (supine to sitting, supine to standing).
• Blood pressure and heart rate were measured at baseline and during postural changes at Day 1 and Week 1 post-admission.
• Analysis focused on hemodynamic changes from supine measurements.

Main Results:

• Stroke patients showed increased mean arterial blood pressure upon sitting and standing on both days.
• Controls experienced a transient fall in blood pressure upon standing on Day 1, but not Week 1.
• Persistent postural hypotension was infrequent (<10%) in both groups.
• Heart rates increased significantly upon sitting and standing in both groups.

Conclusions:

• The observed blood pressure elevation in stroke patients is consistent with sympathetic nervous system overactivity.
• Early upright positioning for rehabilitation in mild-to-moderate stroke is unlikely to cause harmful blood pressure drops.
• Findings support the safety of early mobilization protocols in stroke recovery.