An abnormal dipyridamole thallium/sestamibi fails to predict long-term cardiac events in vascular surgery patients.

Recent data demonstrate that dipyridamole-thallium (DTHAL) and sestamibi (DMIBI) are not predictive of adverse perioperative cardiac events in moderate-risk patients (one or more Eagle risk factors) undergoing major elective vascular surgery. Less data are available regarding the ability of DTHAL/DMIBI to predict adverse cardiac events on long term follow-up. We sought to determine whether an abnormal DTHAL/DMIBI is predictive of adverse cardiac events on long-term follow-up in moderate-risk patients undergoing major elective vascular surgery. Patients were enrolled prospectively between June 1997 and June 1999 at West Los Angeles VA and Harbor-UCLA Medical Centers. Adverse cardiac events were defined as congestive heart failure (CHF), myocardial infarction (MI), unstable angina (USA), and ventricular arrhythmias. Follow-up was obtained via clinic visits, telephone calls, and chart review. We studied 75 patients (76% male, 24% female) with a mean age of 65 years. Operative procedures were primarily femorodistal (83%) and aortic (16%). DTHAL/DMIBI results were normal in 35 patients (47%), demonstrated reversible ischemia in 26 (35%), and showed a fixed defect alone in 14 (18%). From the follow-up results of this study we conclude that there is no association between a reversible ischemia or an abnormal (fixed or reversible) DTHAL/DMIBI and adverse cardiac events or mortality on long-term follow-up in moderate-risk patients who have undergone major vascular surgery.

Simplified admission criterion for predicting severe complications of gallstone pancreatitis.

HYPOTHESIS: Simple admission criteria (white blood cell count, > or =14. 5 x 10(9)/L; blood urea nitrogen level, > or =4.3 mmol/L [> or =12 mg/dL]; heart rate, > or =100 beats per minute; and serum glucose level, > or =8.3 mmol/L [> or =150 mg/dL]) are better predictors of severe complications of gallstone pancreatitis than an Acute Physiology and Chronic Health Evaluation II (APACHE II) score of 5 or greater, a modified Imrie (Glasgow) score of 3 or greater, and a biliary Ranson score of 3 or greater. DESIGN: A prospective consecutive case study. SETTING: A university-affiliated, urban, public hospital. PATIENTS: Ninety-two consecutive patients (77 women and 15 men, aged 18 to 76 years [mean age, 39 years]) with gallstone pancreatitis. Seventy-seven patients were Hispanic. MAIN OUTCOME MEASURES: Major local and systemic complications requiring intensive care unit care, and death. RESULTS: Fourteen patients (15%) had severe complications with a mortality of 2%. On univariate analysis, a white blood cell count of 14.5 x 10(9)/L or more (P =.03), a serum glucose level of 8. 3 mmol/L or more (> or =150 mg/dL) (P<.001), an APACHE II score of 5 or greater (P =.008), a modified Imrie score of 3 or greater (P<.001), and a biliary Ranson score of 3 or greater (P =.03) were statistically associated with the development of severe complications; whereas a blood urea nitrogen level of 4.3 mmol/L or more (> or =12 mg/dL) and a heart rate of 100 beats per minute or more were not. On multivariate analysis, only a serum glucose level of 8. 3 mmol/L or more (> or =150 mg/dL) was predictive of adverse events (P<. 001). CONCLUSIONS: Glucose level (> or =8.3 mmol/L [> or =150 mg/dL]) is the best single admission predictor of severe complications of gallstone pancreatitis and is superior to an APACHE II score of 5 or greater, a modified Imrie score of 3 or greater, and a biliary Ranson score of 3 or greater.

Dipyridamole-thallium/sestamibi before vascular surgery: a prospective blinded study in moderate-risk patients.

PURPOSE: This study assessed in a prospective, blinded fashion whether a reversible defect on dipyridamole-thallium (DTHAL)/sestamibi (DMIBI) can predict adverse cardiac events after elective vascular surgery in patients with one or more clinical risk factors. METHODS: Consecutive patients with one or more clinical risk factors underwent a preoperative blinded DTHAL/DMIBI. Patients with recent congestive heart failure (CHF) or myocardial infarction (MI) or severe or unstable angina were excluded. RESULTS: Eighty patients (78% men; mean age, 65 years) completed the study. Diabetes mellitus was the most frequent clinical risk factor (73%), followed by age older than 70 years (41%), angina (29%), Q wave on electrocardiogram (26%), history of CHF (7%), and ventricular ectopy (3%). The results of DTHAL/DMIBI were normal in 36 patients (45%); a reversible plus or minus fixed defect was demonstrated in 28 patients (36%), and a fixed defect alone was demonstrated in 15 patients (19%). Nine adverse cardiac events (11%) occurred, including three cases of CHF, and one case each of unstable angina, Q wave MI, non-Q wave MI, and cardiac arrest (successfully resuscitated). Two cardiac deaths occurred (2% overall mortality), one after a Q wave MI and one after CHF and a non-Q wave MI. The cardiac event rate was 14% for reversible defect and 9.8% without reversible defect (P =.71). The cardiac event rate was 12.5% (one of eight cases) for two or more reversible defects, versus 11.1% (eight of 72 cases) for fewer than two reversible defects (P = 1.0). The sensitivity rate of two or more areas of redistribution was 11% (95% CI, 0.3%-48%), the specificity rate was 90%, and the positive and negative predictive values were 12.5% and 89%, respectively. CONCLUSION: Our study demonstrated no association between reversible defects on DTHAL/DMIBI and adverse cardiac events in moderate-risk patients undergoing elective vascular surgery.

Fibrin glue reduces intra-abdominal adhesions to synthetic mesh in a rat ventral hernia model.

Postoperative intra-abdominal adhesions are associated with significant morbidity and mortality. In this study, the effect of topical fibrin glue (FG) on adhesion formation in a rat model was investigated. Forty Sprague-Dawley male rats underwent midline laparotomy. Bilateral peritoneal-muscular abdominal wall defects were created and then replaced with premeasured soft tissue Goretex patches. Rats were randomized to FG sprayed over the patches or to a control group. Two observers blinded to the randomization assessed the severity of adhesions to the patch by scoring the density of adhesions (grades 0-3) and the percentage of the patch area covered by adhesions (0-100%). The mean percentage of the patch covered by adhesions was 32.8 +/- 6.1 per cent for the FG group versus 57.9 +/- 6.7 per cent for the control group (P < 0.01). The mean density of adhesions for the FG group was 0.95 (+/-0.17) versus 2.0 (+/-0.21) for the control group (P = 0.001). Topical FG reduces the severity and density of intra-abdominal adhesions in a rat model.

Preoperative versus postoperative endoscopic retrograde cholangiopancreatography in mild to moderate gallstone pancreatitis: a prospective randomized trial.

OBJECTIVE: To determine whether endoscopic retrograde cholangiopancreatography (ERCP) and common bile duct (CBD) stone extraction should be performed routinely before surgery or'selectively after surgery in patients with mild to moderate gallstone pancreatitis. SUMMARY BACKGROUND DATA: The role and timing of ERCP in mild to moderate gallstone pancreatitis remains controversial. Routine preoperative ERCP identifies persisting CBD stones but carries risks of complications and may delay definitive care. Selective postoperative ERCP, performed only if a CBD stone is seen on intraoperative cholangiography (IOC), avoids unnecessary ERCP but risks unsuccessful stone extraction. METHODS: A prospective, randomized study of consecutive patients with gallstone pancreatitis was conducted. Using previously determined criteria, patients with acute cholangitis or necrotizing pancreatitis were excluded. Patients considered at high risk for persisting CBD stones (CBD size > or =8 mm on admission ultrasound, serum total bilirubin > or = 1.7 mg/dL, or serum amylase > or = 150 U/L on hospital day 4) were randomly assigned to routine preoperative ERCP followed by laparoscopic cholecystectomy, or laparoscopic cholecystectomy with selective postoperative ERCP and endoscopic sphincterotomy only if a CBD stone was present on IOC. Primary end points were costs, length of hospital stay, and the combined treatment failure rates (failure of diagnostic ERCP and IOC, complications of ERCP and endoscopic sphincterotomy, and complications of surgery). RESULTS: One hundred fifty-four consecutive patients with gallstone pancreatitis were evaluated prospectively for study eligibility. Sixty patients met the randomization criteria. Thirty patients were randomized to routine preoperative ERCP and 29 patients to selective postoperative ERCP (1 patient refused). Age, admission laboratory values, and APACHE II and Imrie scores were similar in both groups. By protocol, ERCP was performed in all patients in the preoperative ERCP group. In the postoperative ERCP group, ERCP was necessary in only 7 of 29 patients (24%). Mean hospital stay was significantly longer in the routine preoperative ERCP group (11.7 days) than in the selective postoperative ERCP group (9.0 days). Mean total cost was higher in the preoperative ERCP group ($9,426) than in the postoperative ERCP group ($7,798). The combined treatment failure rate was 10% in both groups. CONCLUSIONS: In patients with mild to moderate gallstone pancreatitis without cholangitis, selective postoperative ERCP and CBD stone extraction is associated with a shorter hospital stay, less cost, no increase in combined treatment failure rate, and significant reduction in ERCP use compared with routine preoperative ERCP.

Correlation between admission laboratory values, early abdominal computed tomography, and severe complications of gallstone pancreatitis.

BACKGROUND: Our previous study demonstrated that Balthazar grade D or E pancreatitis on early abdominal computed tomography (CT) scan correlated with severe complications of gallstone pancreatitis (GP). OBJECTIVE: To compare the efficacy of individual admission laboratory criteria, multiple criteria scoring systems and CT scan for predicting severe complications of GP. METHODS: Consecutively admitted patients with GP underwent selective early CT scanning (<72 hours). All patients were prospectively monitored for severe complications. RESULTS: Of the 66 patients studied, 21 (32%) did not undergo for early CT scanning and underwent cholecystectomy with no complications. Forty-five patients (68%) had an early abdominal CT scan. Of the 12 patients with grade E pancreatitis, 6 (50%) developed severe complications versus only 2 of 33 (6%) with grade A to D pancreatitis (P = 0.002). A significant correlation was found between admission white blood cell count > or =14.5 x 10(9)/L and grade E pancreatitis on early CT scan (P = 0.002). However, admission glucose > or =150 mg/dL was the best predictor of complications (sensitivity 100%, negative predictive value 100%). CONCLUSION: Although Balthazar grade E on early CT scan correlates with severe complications of GP, admission glucose > or =150 mg/dL has a better sensitivity and negative predictive value, is quicker to use, and is more cost-effective as a prognostic indicator.

Cardiac morbidity and operative mortality following lower-extremity amputation: the significance of multiple Eagle criteria.

The ability of the Eagle criteria (age >70 years, angina, diabetes, Q wave on EKG, history of congestive heart failure) to predict adverse cardiac events following major vascular surgery has previously been demonstrated. However, the utility of these criteria for lower-extremity amputation is not well established. To determine the value of the Eagle criteria for predicting cardiac morbidity and operative mortality following major lower-extremity amputation, we reviewed 214 consecutive procedures performed at two institutions over a 3-year period. Mean age was 62.7 years and 85% of the patients were male. Diabetes was the most frequent Eagle criterion (74%). The mean number of Eagle criteria was 1.6. Fifty-six percent of the amputations were below the knee, 24% were above the knee, and 20% were guillotine. On multivariate regression analysis, the presence of two or more Eagle criteria (16% vs. 4%, p = 0.04) and decompensated heart failure (39% vs. 7%, p = 0.003) were predictive of adverse cardiac events. The only predictor of postoperative mortality was the presence of two or more Eagle criteria (15% vs. 4%, p = 0.004). Our evaluation of the results of this study led us to conclude that patients requiring major lower-extremity amputation for major vascular disease who have multiple Eagle criteria or decompensated congestive heart failure are at high risk for adverse cardiac events and postoperative death. These findings should be used to guide perioperative cardiac evaluation and therapy.

Early computed tomography is rarely necessary in gallstone pancreatitis.

The role of early CT scanning in acute gallstone pancreatitis remains ill defined. The purpose of our study was to: 1) determine whether our previously identified admission prognostic factors for gallstone pancreatitis [white blood cell (WBC) count > or = 14.5 x 10(9)/L, blood urea nitrogen (BUN) > or = 12 mmol/L, Acute and Chronic Health Evaluation II score > or = 5, glucose > or = 150 mg/dL, and heart rate > or = 100 beats/min)] correlate with the severity of pancreatic inflammation on CT scan, and 2) to determine the utility of early CT scanning in the management of gallstone pancreatitis. Admission clinical and laboratory variables were collected prospectively. Early CT scan findings were graded using the Balthazar scoring system and subgrouped into mild-moderate (Balthazar grades A-C) or severe (grades D and E) by a radiologist blinded to the patients' clinical status. Ninety-seven patients underwent surgery during their initial hospitalization without preoperative CT scanning. Four had operative complications (4%). Forty-two patients underwent early CT scan (grade A, 19%; B, 5%; C, 21%; D, 10%; and E, 45%), but only four (all grade E) had surgery delayed because of necrotizing pancreatitis, abscess, or pseudocyst. All four had persistent abdominal pain. There was one (2.5%) operative complication in the CT group and no deaths. Admission WBC count > or = 14.5 x 10(9)/L and BUN > or = 12 mmol/L correlated with severe pancreatitis (grades D and E) on CT (P < .05). We conclude that in patients with gallstone pancreatitis, 1) admission WBC count > or = 14.5 x 10(9)/L and BUN > or = 12 mmol/L correlate with the severity of pancreatic inflammation on CT scan, and 2) CT scan findings rarely influence management decisions and CT is therefore unnecessary, except in the minority of patients with objective indications of severe or unresolving pancreatitis.

Asymptomatic carotid artery stenosis screening in patients with lower extremity atherosclerosis: a prospective study.

Eighty-nine male veterans presenting to a vascular surgery clinic with symptomatic lower extremity atherosclerosis were prospectively screened by duplex scan for asymptomatic carotid artery stenosis (CAS). Their chief complaint was: claudication (90%), rest pain (6%), and ischemic ulcer or gangrene (4%). The mean ankle-brachial index (ABI) was 0.77. Twenty-five CAS > 50% were detected in 18 (20%) patients. Twelve CAS > 75% were detected in 11 (12%) patients. There was no difference between patients with and without CAS > 50% with regards to mean ABI, history of angina, diabetes, hypertension, prior coronary artery bypass, or history of smoking. Carotid bruit was associated with ipsilateral CAS > 50% [p < 0.0001, sensitivity (52%), specificity (88%), positive predictive value (41%), negative predictive value (92%)]. As a result of the screening, eight elective carotid endarterectomies have been performed to date in six (7%) patients with one transient twelfth cranial nerve paresis as the only postoperative complication. We conclude that: (1) male patients presenting with symptomatic lower extremity atherosclerosis have a 20% prevalence of asymptomatic CAS > 50%, (2) there is no correlation between the degree of lower extremity ischemia and CAS > 50%, (3) carotid bruit is significantly associated with CAS > 50%, but has a low sensitivity, and (4) routine CAS screening should be considered for all male patients with symptomatic lower extremity atherosclerosis regardless of whether a bruit is present.