Ankle-brachial index according to pulse pressure and microalbuminuria in hypertensive patients: a prospective study in family medicine.
BACKGROUND
Microalbuminuria, as determined by the urinary albumin to creatinine (AC) ratio, is a marker of target organ damage (TOD) in hypertensive patients. Pulse pressure (PP) predicts arterial elasticity and the ankle-brachial index (ABI) is a marker of cardiovascular morbidity. TOD reduction should be achieved through improvements in these indices.


OBJECTIVE
To determine whether ABI, calculated as the ratio between mean PP in the upper and lower limbs, is associated with a reduction in renal damage, as measured by the AC ratio.


METHODS
This was a prospective interventional study based on an intention-to-treat analysis in an opportunity sample of patients treated by three specialists in family medicine, with three-monthly follow-up over a total of six months. Blood pressure was measured in arms and ankles, and PP was calculated and used to determine right and left ABI and mean overall ABI. The AC ratio was determined by urine dipstick test. Descriptive and inferential statistical analysis was performed.


RESULTS
A sample of 75 patients were studied (42.4% women), of whom(42.4% women), of whom 27.6% were diabetic, 46.7% overweight/obese and 49.3% dyslipidemic. overweight/obese and 49 dyslipidemic. There were statistical differences for right ABI (as determined by PP) and for mean overall ABI (as determined by mean PP in lower and upper limbs). Bivariate correlation analysis showed that in the group with improved PP between the first and the third observations, n=23 (40%), there was a statistically significant reduction in AC ratio (r = -0.924, two-tailed p < 0.001); the opposite was observed in the group with reduced PP, in which the AC ratio increased.


CONCLUSIONS
ABI determined by systolic blood pressure is an excellent predictor of hemodynamic alterations. Increased ABI, based on PP, was accompanied by improved urinary AC ratio. These results are in line with the international literature.


CONCLUSIONS
An improvement in urinary AC ratio--a predictor of TOD--is observed when an improvement in the ankle PP/brachial PP ratio is achieved.
Martins
Dina
D
Trabalho realizado no Centro de Saúde de Eiras, Administração Regional de Saúde do Centro.
Pimenta
Gonçalo
G
Constantino
Liliana
L
Santos
Tiago
T
Rosendo
Inês
I
Matias
Catarina
C
Miranda
Paula
P
Francisco
Maria Prazeres
MP
Neto
Maria Glória
MG
Santiago
Luiz Miguel
LM
D000419:Albuminuria / Q000150:complications* / Q000503:physiopathology*; D055109:Ankle Brachial Index; D001794:Blood Pressure; D005194:Family Practice; D005260:Female; D006801:Humans; D006973:Hypertension / Q000150:complications* / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies