Seasonal Variation of Ambulatory Blood Pressure

Seasonal Variation of 24hour Ambulatory Blood Pressure Monitoring in Treated Hypertensives

This is a prospective study to evaluate the change in 24 hour ambulatory blood pressure during winter and summer in well controlled treated hypertensives.

Two 24hour ambulatory blood pressure monitorings, 4 to 6 months apart, will be performed on hypertensive subjects on a stable antihypertensive drug therapy for at least 4 weeks.

The correlation of weather and temperature with the 24hour ambulatory blood pressure monitoring will be explored.

Inclusion Criteria:

• Age > 40 yrs
• Treated hypertension on stable treatment for at least 8 weeks
• Average home blood pressure (at least 5 days, 20 readings) < 130/80 mmHg

Exclusion Criteria:

• Congestive heart failure
• Use of loop diuretics