Abstract P297: Comparing Blood Pressure Control in Diabetic verses Non-Diabetic Veterans following Percutaneous Coronary Intervention (PCI)

Abstract

Background: Blood pressure (BP) control in patients with coronary artery disease (CAD) is beneficial on morbidity and mortality, however the US Joint National Committee VII (JNC-7) also recommends systolic BP (SBP) <130 and diastolic BP (DBP) <80 for diabetic patients because diabetes itself is an additional risk for a cardiac event. This can be attained using beta-blockers (BB), angiotensin agonists (ACE-I/ARB), calcium channel blockers, diuretics and nitrates. Methods: We conducted a retrospective cohort study focusing on attaining JNC-7 guidelines, comparing outcomes between 302 diabetic to the 469 non-diabetic patients; all underwent PCI between September 2004 and September 2008 at the Jesse Brown Veterans Hospital in Chicago, IL. We collected data of BP values and antihypertensive regimens on admission and at six month follow up, and correlated these into percentages of which have attained goals. Results: Among diabetics, mean SBP decreased from 134 to 130mmHg (p = 0.002) and mean DBP decreased from 72 to 70mmHg (p= 0.004); in the non-diabetics, the mean SBP decreased from 133 to 127mmHg (p<0.0001) and the mean DBP decreased from 73 to 71mmHg (p<0.0012). With regards to guidelines, the percent of diabetics at SBP goal increased from 41% to 51% (124 to 154 of 302) (p= 0.006), however the percent at DBP goal was not significant. In non-diabetics, percent at goal for SBP increased 46% to 57% (216 to 267 of 469) (p=0.0002) and for DBP increased 69% to 76% (324 to 356 of 469) (p=0.0131). At 6 months, among diabetics the medication usage increased with BB, 80% to 92% (241 to 278 of 302) (p<0.0001) and nitrates 30% to 36% (91 to 109 of 302) (p=0.035). Similarly, among non-diabetics, use of BB, 68% to 87% (319 to 408 of 469) (p<0.0001) and nitrates 19% to 24% (89 to 113 of 469) (p=0.006) increased, as well as ACE-I/ARB 52% to 71% (244 to 333 if 469) (p<0.0001). Conclusions: There were improvements in BP among both populations at six months post-PCI; both attained JNC-7 SBP goal, but only non-diabetics achieved DBP goal. Medication use increased for both groups with BB and nitrates, but also with ACE-I/ARB for non-diabetics only. This analysis suggests that tighter control needs to be obtained among diabetics, especially because they are a higher risk population than those solely with CAD.