Angiotensin 2 type 2 receptor activity and ischemic stroke severity

Area of Science:

• Cardiovascular Medicine
• Neurology
• Pharmacology

Background:

• Certain antihypertensive drugs, like thiazides and calcium channel blockers, increase angiotensin 2 formation.
• Other antihypertensives, such as ACE inhibitors and beta-blockers, suppress angiotensin 2 formation.
• The differential impact of these drug classes on stroke severity is not well understood.

Purpose of the Study:

• To compare the severity of incident ischemic strokes in patients using angiotensin 2 formation-increasing drugs versus those using angiotensin 2 formation-suppressing drugs.
• To evaluate the association between prestroke antihypertensive use and stroke severity.

Main Methods:

• A study of 175 patients presenting with first-ever ischemic stroke within 24 hours.
• Patients were categorized into three groups: those on angiotensin 2 formation increasers, those on suppressors, and those on no antihypertensives.
• Stroke severity was assessed using the NIH Stroke Scale (NIHSS) score, with adjustments for demographic data, risk factors, and other clinical variables.

Main Results:

• The angiotensin 2 increaser group had a lower adjusted median NIHSS score (2.2) compared to the no-antihypertensive group (6.0; p=0.005).
• The angiotensin 2 suppressor group also showed a trend towards lower stroke severity (median NIHSS=4.4; p=0.054) compared to the no-antihypertensive group.
• No significant difference in stroke severity was observed between the angiotensin 2 increaser and suppressor groups (p=0.123).

Conclusions:

• Angiotensin 2 formation-increasing agents did not demonstrate a greater reduction in ischemic stroke severity compared to angiotensin 2 formation-suppressing agents.
• The use of antihypertensive medications prior to a stroke was associated with reduced severity of incident ischemic strokes.