Endoscopic ultrasound guided fine-needle aspiration: What variables influence diagnostic yield?

BACKGROUND: Endoscopic ultrasound (EUS) guided fine-needle aspiration (FNA) plays an important role in the diagnosis of various lesions. We sought to determine factors that influence the diagnostic yield of EUS-FNA, specifically, the presence of a cytopathologist, FNA site, and the endoscopist's skill. METHODS: The data on cytopathologist's availability, duration of procedure, number of passes made, and diagnostic material for cell block (CB) preparation was collected over an 18 months period. RESULTS: 230 specimens (218 patients) were obtained from pancreas (114), lymph node (64), submucosal lesions of the gastrointestinal tract (27), liver (8), and miscellaneous (17) sites. The results were classified as informative (77.8%) and non-informative (NI) (22.2%). The NI rate was significantly high, when a cytopathologist was absent (P = .0008). As the likelihood of cytopathologist's presence increased from 35.8% to 82.9%, the CB quality increased (P < .0001). In the absence of a cytopathologist, the likelihood of NI result increased more than 2-fold (P = .03) and of an inadequate CB increased 3-fold (P < .0001). The more experienced endoscopist "C" (compared to the less experienced "A + B") was less likely to get inadequate material (40.5% vs. 66.3%) (P = .0001). CONCLUSION: The diagnostic yield of EUS-FNA is significantly related to the presence of an on-site cytopathologist and endoscopist's skill in procuring diagnostic material.

Prevalence and Description of Palliative Care in US Nursing Homes: A Descriptive Study.

OBJECTIVE: To describe rates and policies in U.S. Nursing Homes (NH) related to palliative care, comfort care, and hospice care based on a nationwide survey of directors of nursing. MEASUREMENTS: A national survey was distributed online and was completed by 316 directors of nursing of NHs (11% response rate). The directors of nursing were asked about availability and policies in their facilities. Specifically, questions were related to policies, referral patterns, discussion about such care, and types of medical conditions qualifying for such services. RESULTS: Hospice is significantly more available than palliative or comfort care programs; also, for-profit facilities, compared to non-profits, are significantly more likely to have palliative care programs and medical directors for palliative care. Social workers and nurses were most likely to suggest palliative type programs. Only 42% of facilities with palliative program provide consultation by a palliative certified physician. Residents with non-healing pressure ulcers, frequent hospitalizations, or severe/uncontrolled pain or non-pain symptoms were less likely to be referred. CONCLUSIONS: There is limited availability of palliative type programs in NH facilities and underutilization in those NH with programs.

Sex in Nursing Homes: A Survey of Nursing Home Policies Governing Resident Sexual Activity.

OBJECTIVE: To identify nursing home (NH) standards related to sexual activity and sexual relationships for residents through a nationwide survey of directors of nursing (DONs). METHODS: A national survey was distributed online and was completed by 366 DONs of skilled nursing facilities. The DONs answered questions concerning policies and experiences related to sexual activities of their residents including types of resident sexual activity they have encountered, perceptions about residents with dementia engaging in sexual activity, and policies pertaining to sexual activity including masturbation. RESULTS: The results of the survey demonstrated that the vast majority (71.2%) indicated that there had been issues regarding residents' sexual activities in their facilities with over one-half (58%) of the DONs reporting situations of resident with resident sexual activity and 60% with situations of resident masturbation. More than one-half (56.6%) require a family or designated representative to approve sexual activity for a cognitively impaired resident. For a cognitively intact resident, 12.4% of facilities still require family or designated representative to approve sexual activity. However, despite the prevalence of sexual activity, the majority of NHs (63.4%) actually do not have policies dealing with resident sexual activity. Of the NHs with policies, 58.6% have written policies in place, with 11.2% requiring a physician order to allow sexual activity and 9.5% requiring a physician order to restrict sexual activity. CONCLUSIONS: Issues related to sexual activity in NH residents are quite prevalent, however, the rates of policies related to sexual activity are low and the policies and restrictions are not uniform. Our study suggests nursing homes should have a clear policy addressing resident sexual activity. It would be beneficial for such a policy to be communicated to residents and their families as part of an admission package instead of waiting for sexual interest to be noticed. This would enable residents to engage in sexual activity with understanding and support rather than hiding.

The vitamin d dose response in obesity.

OBJECTIVE: The prevalence of vitamin D inadequacy is high in obese individuals. Determining the response of serum 25-hydroxyvitamin D (25[OH]D) to vitamin D3 supplementation in obese and nonobese individuals may lead to concurrent recommendations for optimal vitamin D intake in these populations. The objective of this study was to determine the dose response of vitamin D3 in subjects with a body mass index ≥35 kg/m2. METHODS: Randomized, double-blind, placebo-controlled study. This study is an extension of our previous study of vitamin D dosing in healthy adults. After an assessment of baseline 25(OH)D levels, participants were randomized to a vitamin D supplementation arm (100 µg daily if baseline 25[OH]D was <50 nmol/L, or 50 µg daily if baseline 25[OH]D was ≥50 nmol/L) or placebo arm. Subjects with baseline 25(OH)D level ≥80 nmol/L were excluded from the study. Two months following randomization, a repeat 25(OH)D measurement was done. RESULTS: Final analysis included 25 subjects (14 placebo, 11 active). At 2 months, serum 25(OH)D concentration increased to a mean of 75 nmol/L in the active group. Mean slope (i.e., vitamin D3 response), defined as 25(OH) D change/baseline dose, was 0.398 nmol/L/µg/day. CONCLUSION: The dose response of vitamin D3 (slope) in obese subjects was significantly lower (P<.03) at 0.398 nmol/L/µg/day compared to the slope in the previous study of healthy subjects (0.66 nmol/L/µg/day). These results suggest that obese individuals may require 40% higher vitamin D intake than nonobese individuals to attain the same serum 25(OH)D concentration.

Chest radiography in supporting the diagnosis of asthma in children with persistent cough.

OBJECTIVE: To establish whether chest radiographic findings suggestive of lower airway obstruction (LAO) disease support the diagnosis of asthma in pediatric patients with persistent cough in an outpatient setting. METHODS: 180 patient charts were reviewed. The patients were children aged 1 to 18 years referred over a 3-year period to a pediatric pulmonary subspecialty clinic for evaluation of cough lasting ≥ 4 weeks. Chest radiographic images obtained after the initial evaluation of 90 patients diagnosed with cough-variant asthma and 90 patients diagnosed with persistent cough from nonasthma origins were compared with radiologic findings of a control group consisting of patients with a positive tuberculin skin test and no respiratory symptoms. Increased peribronchial markings/peribronchial cuffing and hyperinflation were considered radiographically suggestive findings of LAO disease. RESULTS: Children diagnosed with cough-variant asthma at the initial evaluation had higher rates of chest radiographic findings suggestive of LAO disease (30.00%) than children with persistent cough from other causes (17.80%) or those with a positive tuberculin skin test and no respiratory symptoms (8.16%) (overall P value = 0.0063). They also had higher rates of spirometry abnormalities suggestive of an LAO defect. Children with chest radiographic findings suggestive of LAO disease were found to be younger than those with normal chest radiographic findings (5.0 ± 2.7 years vs 8.6 ± 4.7 years; P < 0.0001). CONCLUSION: This study suggests that chest radiographic findings indicative of an LAO in correlation with the clinical presentation can support the diagnostic suspicion of asthma, especially in younger children unable to perform spirometry.

Role of alvimopan (entereg) in gastrointestinal recovery and hospital length of stay after bowel resection.

PURPOSE: Postoperative ileus (POI) can delay gastrointestinal (GI) recovery after bowel resection. Alvimopan (Entereg), a peripherally acting mu-opioid receptor antagonist, is thought to favorably reduce various outcome measures such as the length of stay (LOS) and time from surgery to hospital discharge following partial-bowel, large-bowel, or small-bowel resection surgery with primary anastomosis. We undertook a study to compare these outcome measures in alvimopan-treated patients undergoing laparoscopic or open-bowel resection against a control group. We also sought to determine whether any other factors-Diagnosis-Related Group (DRG) status, complications, inflammatory bowel disease, type of surgery, age, sex, intestinal cancer, diverticular disease, number of chronic conditions, and operative time-were predictive of a more favorable (shorter) time to GI recovery. METHODS: Patients' charts were retrospectively reviewed at a large 591-bed teaching hospital in suburban New York City between June and August 2010. We applied descriptive statistics for five outcome variables to compare alvimopan-treated patients with non-users. The main outcome variable was the time from surgery to hospital discharge. Secondary outcome variables were the time to pass gas, time to a liquid diet, time to a solid diet, and total LOS. We compared the outcome variables for three groups of DRG codes (329, the most complicated cases; 330, intermediate; and 331, least complicated) to determine which variables influenced these outcome measures. Multivariate analysis with stepwise multiple linear regression analysis was performed to determine independent predictors of shorter times of outcome variables. RESULTS: Of 80 patients, 43 received alvimopan (53.75%), and 37 (46.25%) did not. The female-to-male ratio was about 50:50 (56.25% vs. 43.75%). The mean age (standard deviation) was 66.0 (14.9) years (range, 30-92 years). In the multivariate analysis (adjusted for demographics, DRG status, type of surgery, complications, comorbidities, and operative time), for all of our outcome variables (except for time to a liquid diet), patients receiving alvimopan had shorter times to GI recovery (about 25% less) than controls did (p < 0.05). DRG status, complications, inflammatory bowel disease, type of surgery, and age were also significantly predictive of one or more outcome variables, whereas sex, intestinal cancer, diverticular disease, the number of chronic conditions, and operative time were not predictive of any outcomes. CONCLUSION: GI recovery times were generally shorter for alvimopan-treated patients than for those who did not receive the study drug (P < 0.05). Alvimopan improved quality of life and reduced the cost of surgical care. This medication was considered to be a good choice for the perioperative management of patients requiring segmental bowel resection with primary anastomosis.

The appendix may protect against Clostridium difficile recurrence.

BACKGROUND & AIMS: Several risk factors have been identified for the development of recurrent Clostridium difficile infection (CDI) that alter host immunity and disrupt colonic flora. Although the function of the appendix has been debated, its active, gut-associated lymphoid tissue and biofilm production indicate potential roles in recovery from initial CDI and protection against recurrent CDI. We investigated whether the presence or absence of an appendix is associated with CDI recurrence. METHODS: We reviewed the medical records of adult inpatients with CDI who were admitted to a tertiary-care teaching hospital from 2005 to 2007 to identify those with and without an appendix. The primary dependent variable for statistical analysis was CDI recurrence. RESULTS: In a multivariate analysis of 11 clinical variables, the presence of an appendix was associated inversely with CDI recurrence (P < .0001; adjusted relative risk, .398). Age older than 60 years also was associated with CDI recurrence (P = .0280; adjusted relative risk, 2.44). CONCLUSIONS: The presence of an appendix has a significant and independent, inverse association with CDI recurrence, but this finding requires validation in a prospective study. Assessing the presence or absence of an appendix might be useful in predicting CDI recurrence.

Improving uniformity of care for colorectal cancers through National Quality Forum quality indicators at a Commission on Cancer-accredited community based teaching hospital.

The National Cancer Data Base (NCDB) provides feedback on adherence to National Quality Forum (NQF)-endorsed measures to promote best outcomes in colorectal cancer. We examined the care delivered to patients with colorectal cancer at our institution and developed a protocol to enhance nodal retrieval and to ensure that patients with fewer than 12 nodes are considered for adjuvant chemotherapy. Few patients met the NQF criteria for adjuvant radiation. A protocol was developed to address this issue, and this provides a model for use in a multidisciplinary effort to improve adherence to measures associated with best outcomes in colorectal cancer.

Post-carotid endarterectomy hyperperfusion syndrome-is it predictable by lack of cerebral reserve?

BACKGROUND: Cerebral hyperperfusion syndrome (HS) is presumed to be because of an increase in postendarterectomy flow in patients with fixed cerebral vascular reserve. Severe headache is thought to be an early sign of possible HS. An increase in partial pressure CO2 (pCO2) is known to cause cerebral vasodilatation and is used to evaluate the presence of cerebral reserve. METHODS: A total of 45 patients undergoing carotid endarterectomy had internal carotid artery flow measured with a transonic flow probe as follows: F1, immediately after full dissection of the internal carotid artery; F2, after 30 seconds of breath holding; and F3, after restoration of flow. ΔF2-F1 and ΔF3-F2 were also evaluated. A 10% increase between F2 and F1 indicated normal cerebral reserve and between F3 and F2 indicated increased postoperative flow. Age, gender, medical comorbidities, indication for carotid endarterectomy, intraoperative cerebral oximetry values, and percentage of bilateral carotid stenosis were recorded. All patients were contacted after discharge about the presence of postoperative headache or other suggestions of HS. Fisher's exact test was used for categorical predictors and the rank-sum test for continuous predictors. RESULTS: Seven (16%) patients (group A) developed postoperative headache and 38 (group B) did not. No patient developed HS. No variables were associated with postoperative headache except for female gender (p = 0.005). There were no statistically significant differences in F1, F2, F3, and ΔF (F2-F1 or F3-F2) between groups A and B (there was no descriptively significant ΔF2-F1 in 17 patients). Only one of the nine patients who had no change between F2 and F1, who had a significant increase in F3, and who was thought to be at higher risk for HS developed a postoperative headache. CONCLUSIONS: Lack of cerebral reserve is common in patients undergoing endarterectomy. If headache is an early sign of hyperperfusion, it does not seem to be predicted by lack of cerebral reserve and an increase in postendarterectomy flow.

Antipsychotic drug use since the FDA black box warning: survey of nursing home policies.

OBJECTIVES: To use a nationwide survey to assess changes in antipsychotic utilization patterns and usage policies in nursing homes (NHs) in the United States since the introduction of the black box warning by the FDA. DESIGN/SETTING/PARTICIPANTS: A survey was distributed online and was completed by 250 directors of nursing of NH. The directors of nursing answered questions concerning policies about and use of antipsychotic medications. MEASUREMENTS/RESULTS: The most commonly reported intervention to manage symptoms in residents with dementia since the black box warning was to lower doses of antipsychotics. Over half of facilities report obtaining more frequent psychiatry/psychology consults. One-hundred seven facilities have a policy regarding informing family members of residents about the black box warning. Most facilities (63.6%) with a policy require family to sign consent. In the NH setting, the presence or absence of a policy did not correlate with the reported change in use of antipsychotics or types of alternative interventions. CONCLUSION: Notably, a large number of NH facilities have policies regarding informed consent on the use of antipsychotics. However, in our study, the rate of use of antipsychotics did not change in many facilities since the black box warning. In addition, having a policy did not correlate with decreased antipsychotic use or with use of alternate agents or nonpharmacologic methods to address symptoms. The results of this survey suggest that NH administrators should worry less about the legal exposure of using antipsychotics and focus on actions that result in improved patient care.

Evaluation of housestaff knowledge and perception of competence in palliative symptom management.

PURPOSE: The Accreditation Council for Graduate Medical Education requires that internal medicine (IM) core curricula include end-of-life care and pain management concepts and that fellows in hematology/oncology, pulmonary/critical care, and geriatrics should receive formal instruction and clinical experience in palliative and end-of-life care. We aimed to assess the effectiveness of current teaching methods for housestaff in these fields. METHOD: All of the IM residents, geriatric medicine fellows, hematology/oncology fellows, and pulmonary/critical care fellows from four regional graduate medical education sites were asked to participate in an online survey at the beginning and end of the 2008-2009 academic year. We evaluated seven domains of knowledge of palliative care and pain management with a self-assessment of competence in these areas. We also asked participants to describe their current curriculum and training in palliative medicine. RESULTS: There were 326 e-mailed survey invitations. There were 180 responses for the start-year survey and 102 responses for the end-year survey. All sites were represented in the responses. The only learners to significantly improve their palliative knowledge during a year of training were PGY-1s and PGY-4s. The majority of housestaff surveyed report that their current palliative medicine training is inadequate. The vast majority (84.6%) said a dedicated palliative medicine rotation would be "useful" or "very useful." CONCLUSIONS: Housestaff recognize their lack of experience and training in palliative medicine and are interested in many teaching venues to improve their skills. A more focused curriculum in palliative and end-of-life care is required at both resident and subspecialty fellowship levels.

Written disclosure therapy for patients with chronic lung disease undergoing pulmonary rehabilitation.

PURPOSE: Chronic lung diseases are typically associated with impaired quality of life, stress, and anxiety. Written disclosure therapy (WDT) reduces stress in patients with a variety of chronic illnesses. We sought to determine whether WDT benefits patients with chronic lung disease. METHODS: A prospective, randomized, controlled trial was performed to evaluate the effect of using WDT in patients (N = 66) participating in a pulmonary rehabilitation program. Patients were randomly assigned to write about a particularly traumatic life event (WDT group) or to write about an emotionally neutral subject (control group). Exercise capacity, dyspnea and quality of life, and values of spirometry were recorded at baseline, at the end of the program, and at 6 months. RESULTS: The 6-minute walk distance (6MWD) significantly improved in both groups at 2 months, from 278 to 327 m in WDT and from 269 to 314 m in control groups (P < .01 in both groups). There was no difference in improvement in 6MWD between groups (P = .88). At 6 months, the gains made in 6MWD were no longer present. Dyspnea severity, as well as most of the other domains of the Chronic Respiratory Disease Questionnaire and the St. George's Respiratory Questionnaire, showed improvement within each group, but not between WDT and control groups. CONCLUSION: WDT did not add any additional benefit in patients with chronic obstructive pulmonary disease or idiopathic pulmonary fibrosis when included as a component of pulmonary rehabilitation. These results are in contrast to previously seen benefits in patients with asthma.

Rapid influenza A testing for novel H1N1: point-of-care performance.

OBJECTIVES: The 2009 outbreak of novel influenza A H1N1 reached a pandemic status on June 11, 2009. Early detection is a key factor for management and infection-control practices. Recent studies have suggested a difference in performance of rapid influenza kits for influenza A H1N1. Our goal was to evaluate the performance of the QuickVue influenza A+B test (Quidel Corp., San Diego, CA) in an emergency department setting and determine the most current epidemiologic trends in our community. METHODS: Results from 1137 samples for influenza A collected between April 8, 2009 and June 30, 2009 were retrospectively reviewed. Results of QuickVue influenza A+B test were compared with R-Mix viral culture and DFA results. Age distribution and hospitalization rates by age group were analyzed to further delineate the epidemiology of influenza A in a suburban hospital. RESULTS: The sensitivity of the rapid test was 77%, the specificity was 85%, the positive predictive value was 74%, and the negative predictive value was 87%. We found a similar age distribution for positive influenza tests and admissions when compared with the national Centers for Disease Control and Prevention data. CONCLUSIONS: The QuickVue influenza A+B test is a sensitive assay for the novel H1N1 strain of influenza. In our hospital, the group with highest risk of hospital admission was patients aged < 25 years.

Femoral-popliteal bypass with endoscopically harvested saphenous vein in patients with TASC D disease of the superficial femoral artery.

BACKGROUND: This study evaluated patients undergoing femoropopliteal bypasses using endoscopically harvested vein to treat Trans-Atlantic Inter-Society Consensus (TASC) stage D lesions. Primary patency and primary assisted patency were evaluated, as were perioperative morbidity and mortality and hospital length of stay (LOS). Results for this minimally invasive alternative to femoropopliteal bypass with conventional open vein harvesting were analyzed. METHODS: A retrospective analysis was performed on patients who underwent femoral-popliteal bypass with endoscopic saphenous vein harvest and angiographic TASC D anatomy. Postoperative duplex exams were evaluated, and the study end points of graft thrombosis or the development of a high-grade stenosis prompting reintervention were sought. Patient demographics, morbidity, mortality, and hospital LOS were analyzed. RESULTS: Twenty-seven patients meeting our inclusion criteria underwent surgery between June 2002 and June 2007. Indications for surgery in these patients were claudication (n=10), gangrene or ulceration (n=9), and ischemic rest pain (n=8). Fifty-two percent of the patients were male, 50% had cardiac disease, 65% had hypertension, 54% were diabetic, and 65% had a significant smoking history. Median LOS was 2.5 days in claudicants, 3.0 days in patients with rest pain, and 7.0 days in patients with gangrene or ulceration (p<0.05). Kaplan-Meier primary patency and primary assisted patency rates were 73.2% and 80.8% at 1 year, respectively; and these rates were maintained for 70 months. The only perioperative complication was a superficial wound infection, and two patients died during follow-up from causes unrelated to the surgery. CONCLUSION: Femoropopliteal bypass using endoscopic vein harvest is a durable reconstructive vascular procedure which can be performed with minimal postoperative morbidity, short LOS, and satisfactory long-term patency.

Nursing home policies on items brought in from the outside for facility residents.

OBJECTIVE: To identify nursing home standards related to items brought in from the community for residents through a nationwide survey of directors of nursing. Specifically we examined the policies with regard to food, cigarettes, alcoholic beverages, and over-the-counter medications. METHODS: A national survey was distributed online and was completed by 299 directors of nursing of skilled nursing facilities. The directors of nursing were asked about policies regarding whether family and friends of residents are permitted to bring in items such as food, cigarettes, alcohol, and over-the-counter medications. Specifically, questions were related to monitoring, staff involvement, safety precautions, and policy implementation. RESULTS: The results of the survey demonstrated a consistent policy practiced among facilities. Items commonly restricted for all residents included over-the-counter medications, alcohol, and cigarettes. On the other hand, food was significantly less likely to be restricted. CONCLUSION: Despite overall strict policies regarding the monitoring of access to over-the-counter medications, alcohol, and cigarettes by nursing home residents, ingestion of outside food remains fairly unrestricted. This is especially concerning given the growing number of residents with end-stage congestive heart failure, diabetes, dysphagia, or food allergies where access to outside food could result in an adverse event. Perhaps, facilities need to identify at-risk residents and better communicate to residents and their families regarding dietary restrictions on outside food.

Do geriatricians practice what they preach?: geriatricians' personal establishment of advance directives.

Previous research has been conducted regarding preferences of physicians for life-sustaining treatments for themselves, but there is a dearth of data on personal use of advance directives (ADs) by geriatricians specifically. Using a phone survey, we contacted all graduates of the geriatric fellowship program to assess their personal use of advance directives and their personal preferences for life-sustaining treatment. Of the 124 living graduates of the Parker Jewish Institute for Health Care and Rehabilitation, 70 agreed to participate. One third of respondents had established ADs for themselves, with higher rates in women than men (p = .054). Older geriatricians were significantly more likely to have advance directives (exact trend test yields, p < .0001). In general, respondents did not inform their health care providers about their desires for end-of-life care. This study revealed that the majority of fellowship-trained geriatricians did not formally establish advance directives for themselves. Further research is needed to determine whether physicians who establish advance directives for themselves are more likely to encourage their patients to do so.

Fetal fibronectin testing in patients with short cervix in the midtrimester: can it identify optimal candidates for ultrasound-indicated cerclage?

OBJECTIVE: The objective of the study was to determine the relationship between fetal fibronectin (fFN) testing prior to ultrasound-indicated cerclage and obstetric outcome. STUDY DESIGN: Singleton pregnancies between 18 and 24 weeks' gestation with an ultrasound-diagnosed short cervix (< 25 mm) and funneling (> 25%) of the chorioamniotic membranes into the endocervical canal were analyzed. The fFN testing was performed and patients were randomized to cerclage or no-cerclage. Groups were stratified by fFN result. Cerclage patients were compared with no-cerclage patients. The primary outcome was delivery prior to 35 weeks' gestation. RESULTS: Spontaneous preterm birth prior to 35 weeks' gestation occurred in 15 (44.1%) fFN-positive-cerclage patients and 16 (55.2%) fFN-positive no-cerclage patients (P = .45). Similarly, it occurred in 16 (17.8%) fFN-negative cerclage patients and 11 (17%) fFN-no-cerclage patients (P = .99). CONCLUSION: fFN did not identify optimal candidates for cerclage. However, fFN testing before an ultrasound-indicated cerclage aids in counseling patients, anticipating the outcome of pregnancies complicated by cervical shortening.

Relationships between statistical measures of agreement: sensitivity, specificity and kappa.

OBJECTIVES: Cohen's kappa coefficient is presently a standard tool for the analysis of agreement on a binary outcome between two tests. In view of the ubiquity of the use of sensitivity, specificity, raw agreement and kappa in clinical studies, clearly it is advantageous to have a useful analytic relation connecting these measures of agreement. METHODS: We elaborate on previous work, comment on other results appearing in the literature and discuss analytic formulas relevant to various problems connecting specificity, sensitivity and kappa. RESULTS: For selected values of kappa that range from good to excellent, a graph of the curves representing minimal pairs of sensitivity and specificity is provided. CONCLUSIONS: The analytic formulas and graph could be potentially useful to clinicians and biostatisticians in better interpreting the outcomes of an alternative diagnostic test whenever the measures sensitivity, specificity and kappa are employed together.

Significant correlation between cerebral oximetry and carotid stump pressure during carotid endarterectomy.

Limited information on a correlation between carotid stump pressure and cerebral oximetry changes associated with cross-clamping of carotid vessels during carotid endarterectomy (CEA) prompted us to prospectively evaluate 38 consecutive CEAs in 37 patients. The authors used the INVOS-4100 cerebral oximeter to measure cerebral oximetry (cerebral oxygen saturation) before (t1) and after (t2) cross-clamping along with carotid stump pressure. All patients had CEA under general anesthesia with the routine use of a Javid shunt. Cross-clamping (t1 vs. t2) resulted in statistically significant changes (p < 0.0001) on the operated side of 6.03 units or a percent change of 9.2% when analyzed using the nonparametric signed-rank test. The nonoperated side had insignificant change (p = 0.71). Spearman correlation analysis revealed significant correlation (r = -0.63) between cerebral oximetry changes on the operated side and carotid stump pressure such that a larger change in cerebral oximetry due to cross-clamping was strongly and significantly correlated with lower carotid stump pressure. Using regression analysis, stump pressures of 25 and 50 mm Hg were predicted by cerebral oximetry changes of 28.5 or 8.8 units, respectively. This is equivalent to a percent change from baseline (t1) of 41.1% or 13.1%, respectively. Taken together, these findings suggest that cerebral oximetry can be used as an alternative to carotid stump pressure to provide noninvasive, inexpensive, and continuous real-time monitoring during CEA.

Results of carotid endarterectomy with pericardial patch angioplasty: rate and predictors of restenosis.

Routine patch angioplasty after carotid endarterectomy (CEA) is believed to decrease the incidence of recurrent stenosis. The results of autogenous vein, Dacron, and PTFE used as a patch material have been described. Bovine pericardium has more recently been introduced as a patch material. We studied 61 of 73 consecutive patients who underwent isolated CEA with pericardial patch angioplasty to determine the incidence of restenosis and variables associated with restenosis. All patients had intraoperative completion duplex examination performed, and no patient had residual stenosis or anatomic defects at the end of the procedure. All procedures were performed under general anesthesia with the use of a Javid shunt. Mean age was 72.8 +/- 7.8 years, 41% were female, and 62% were asymptomatic. Hypertension was present in 72%, elevated cholesterol in 80%, and history of coronary artery disease in 44%. Recurrent stenosis of >50% was considered to be significant. Our study focuses on 61 of 73 patients who had follow-up duplex ultrasound data available. There were no perioperative neurologic events, reoperations for bleeding, or deaths. Mean duplex follow-up available in 61 patients was 13.1 +/- 5.1 months. Thirty-six patients had 1-15% stenosis, 15 patients had 16-49%, and 10 patients had 50-79%. In the 50-79% group, the mean systolic velocity was 154 +/- 25 cm/sec and the mean end diastolic velocity (EDV) was 36 +/- 16 cm/sec. The highest EDV in the 50-79% group was 56 cm/sec. No patients had stenosis in the 80-99% range. There were no late neurologic events and no late reinterventions. Kaplan-Meier restenosis-free survival at 1 year was 95.6%. Significant univariate predictors of recurrent stenosis of >50% were younger age (68 vs. 74 years, p = 0.04) and presence of preoperative symptomatic disease (35% vs. 5%, p = 0.004). Stepwise multiple logistic regression indicated the most significant predictor of restenosis was the presence of preoperative symptoms (p = 0.008). Stepwise Cox regression analysis also showed preoperative symptomatic status was the only significant factor for restenosis (p = 0.019), with a relative risk of 6.65 and a 95% confidence interval of 1.36-32.4. In conclusion, pericardial patch angioplasty is associated with minimal early adverse events. Restenosis with pericardial patch angioplasty is not uncommon, but high-grade restenosis did not occur in this study. The presence of preoperative symptoms and younger age were the most significant predictors of restenosis.