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We report the occurrence of atheroembolic disease in an elderly patient with coronary artery disease who had cardiac catheterization followed by coronary artery bypass graft. The patient developed acute renal failure and extra-renal manifestations with biochemical and clinical evidence of deep organ involvement which ended in death due to severe cardiac failure despite improvement of renal function.

Unlabelled: Hypertension and renal injury in experimental polycystic kidney disease., Background: Hypertension accelerates renal failure in autosomal dominant polycystic kidney disease (ADPKD), and evidence suggests a role for the renin-angiotensin system (RAS) in the functional and structural changes. To explore the hypothesis that RAS adaptations contribute to disease progression, we examined RAS activity and the long-term consequences of antihypertensive drugs, which suppress (enalapril) or stimulate (hydralazine) the RAS, in experimental polycystic kidney disease., Methods: Studies were conducted in male heterozygous cystic Han:SPRD rats (Cy/+) and in unaffected littermates (controls). In protocol 1, either angiotensin II (Ang II), enalaprilat, or saline vehicle was acutely infused into cystic and control rats, which were aged 10 to 12 weeks. The mean arterial pressure (MAP), glomerular filtration rate (GFR), and renal plasma flow (RPF) were measured at baseline and after an infusion of test substances. In protocol 2, cystic rats received chronic therapy with either enalapril, hydralazine, or no therapy for 10 to 12 weeks of age and then underwent renal function and RAS studies. In protocol 3, similar cohorts were followed for 40 weeks to assess the effects of therapy on blood pressure, proteinuria, serum creatinine, RAS parameters, and renal morphology., Results: In protocol 1, cystic rats had massive kidneys, slightly elevated blood pressure, and profound renal vasoconstriction and reduced GFR. Ang II induced similar changes in MAP and renal function in control and cystic rats. Enalaprilat induced little effect on MAP but more striking increases in GFR and RPF in cystic rats. In protocol 2, at 10 weeks of age, enalapril was superior in preserving renal function, but neither drug limited the expansion of the tubulointerstitium. In protocol 3, at 40 weeks of age, both drugs ameliorated the increase in serum creatinine, although only enalapril reduced proteinuria and kidney size., Conclusions: In polycystic rats, acute RAS suppression markedly ameliorates renal dysfunction. However, although chronic enalapril and hydralazine protect against the loss of renal function, only enalapril limits renal growth and proteinuria, and neither significantly limits tubulointerstitial fibrosis. The long-term studies give clear support to the importance of blood pressure control, per se, but only partial support to the importance of the particular agent used. As in clinical studies, angiotensin-converting enzyme inhibition may be less beneficial in ADPKD than in renal diseases characterized by predominant glomerular injury.

Background: We correlated the electrophysiologic (EP) effects of adenosine with tachycardia mechanisms in patients with supraventricular tachycardias (SVT)., Methods and Results: Adenosine was administered to 229 patients with SVTs during EP study: atrioventricular (AV) reentry (AVRT; n=59), typical atrioventricular node reentry (AVNRT; n=82), atypical AVNRT (n=13), permanent junctional reciprocating tachycardia (PJRT; n=12), atrial tachycardia (AT; n=53), and inappropriate sinus tachycardia (IST; n=10). There was no difference in incidence of tachycardia termination at the AV node in AVRT (85%) versus AVNRT (86%) after adenosine, but patients with AVRT showed increases in the ventriculoatrial (VA) intervals (13%) compared with typical AVNRT (0%), P<0.005. Changes in atrial, AV, or VA intervals after adenosine did not predict the mode of termination of long R-P tachycardias. For patients with AT, there was no correlation with location of the atrial focus and adenosine response. AV block after adenosine was only observed in AT patients (27%) or IST (30%). Patients with IST showed atrial cycle length increases after adenosine (P<0.05) with little change in activation sequence. The incidence of atrial fibrillation after adenosine was higher for those with AVRT (15%) compared with typical AVNRT (0%) P<0.001, or atypical AVNRT (0%) but similar to those with AT (11%) and PJRT (17%)., Conclusions: The EP response to adenosine proved of limited value to identify the location of AT or SVT mechanisms. Features favoring AT were the presence of AV block or marked shortening of atrial cycle length before tachycardia suppression. Atrial fibrillation was more common after adenosine in patients with AVRT, PJRT, or AT. Patients with IST showed increases in cycle length with little change in atrial activation sequence after adenosine.