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Classification for Nocturnal Blood Pressure

Purpose: To classify nocturnal blood pressure measurements based on the criteria of Friedman and Logan.

Description

Ambulatory blood pressure monitoring permits measurement of blood pressure throughout the day and night. A normal patient should have a drop in blood pressure ("dip") at night. A patient who does not show this drop in blood pressure ("nondipper") may have increased cardiovascular morbidity.


 

Patients were classified by:

(1) nocturnal blood pressure status

(2) nocturnal blood pressure fall

 

Nocturnal BP Status

Blood Pressure (S/D)

normotensive

< 125/75 mm Hg

hypertensive

>= 125/75 mm Hg

 

mean arterial blood pressure =

= ((systolic blood pressure) + (2 * (diastolic blood pressure))) / 3

 

percent nocturnal blood pressure fall =

= ((daytime mean arterial BP) - (nighttime mean arterial BP)) / (daytime mean arterial blood pressure) * 100%

 

Percent Nocturnal Blood Pressure Fall

Term

>= 20% fall

extreme dipping

10 to 19.9% fall

normal dipping

0 to 9.9% fall

attenuated dipping

rise (negative fall)

rising (nondipping)

 


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Specialty

Objective

ICD-10