Impact simulation on pre-formed prosthesis for large cranial defect

Cranioplasty greater than 10 cm2 in size is challenging task for neurosurgeon. There are many successful trials to fill the small defect with various materials. Proper cranioplasty can provide subsequently restoration of cerebral protection, cosmetic aspect and neuronal function. However, larger defect may not provide adequate protection from the auto, industrial or sport accident even with cranioplasty. In this study, patch design using two popular materials was evaluated and compared with bone material. Then impact-releasing holes were implemented to the patch. The movement of the large patch and its effect on the underlying brain tissue upon simulated impact was evaluated by using finite element analysis.

Does race or socioeconomic status predict adverse outcome after out of hospital cardiac arrest: a multi-center study

OBJECTIVE

To assess whether socioeconomic status (SES) or race is associated with adverse outcome after an out-of-hospital cardiac arrest (OHCA).

METHODS

A convenience sample of OHCA of presumed cardiac origin from seven suburban cities in Michigan, 1991-1996. Median household income (HHI), utilizing patient home address and 1990 census tract data, was dichotomized above and below 1990 state median income. Patient race was dichotomized as black or white. Outcome was defined as survival to hospital discharge (DC). Multiple logistic regression and Pearson's chi2 values were used for analysis.

RESULTS

Of 1317 cases with complete data for analysis, the average age was 67.3 +/- 16.0, 939 (71.1%) were white, 587 (44.4%) arrests were witnessed (WIT), and 65 (4.9%) were DC alive. There was no significant difference between races with respect to WIT arrests, V(T)/V(F) arrest rhythms, and a small difference in EMS response interval. Whites were more likely to be above median HHI (57.1 vs. 26.2%, P < 0.001). Adjusted odds ratios for predictors of survival were WIT arrest (OR = 3.76, 95% CI (1.7, 8.2)), V(T)/V(F) (OR = 8.74, 95% CI (3.7, 10.8), but not race (OR = 0.68, 95% CI (0.3, 1.4)) or SES (OR = 1.51, 95% C1 0.8, 2.8).

CONCLUSION

In this population, neither race nor SES was independently associated with a worse outcome after OHCA.

Race and survival after out-of-hospital cardiac arrest in a suburban community

STUDY OBJECTIVE

To determine whether race, when controlled for income, is an independent predictor of survival to hospital discharge after out-of-hospital cardiac arrest (OHCA).

METHODS

Prospective OHCA data were collected over 4 years (1991-1994) from a convenience sample of OHCA patients transported to nine hospitals in three suburban counties. Race was determined from hospital and vital statistics records. The average household income was identified from ZIP codes and used as a marker of socioeconomic status. Demographic data and known predictors of survival were compared between blacks and whites. A logistic regression analysis was used to assess the association between race, income, and survival.

RESULTS

Of the 1,690 patients, 223 (13%) were blacks and 1,467 (87%) were whites. Average household income was less for blacks than for whites ($40,225 versus $46,193; P < .001), but both populations were affluent by national standards (national percentile ranks were 73% and 88%, respectively). The populations were no different in percentage of witnessed arrests (57% versus 61%; P = .465). Blacks were younger (mean +/- SD, 62 +/- 16 versus 68 +/- 15 years; P < .001); less frequently received bystander CPR (11% versus 20%; P = .002); less often had ventricular tachycardia or ventricular fibrillation (37% versus 50%; P < .001); and had a shorter advanced life support call-response interval (median, 4 versus 6 minutes; P < .001). The odds ratio for survival (white/black) was .931 (95% confidence interval, .446 to 1.945).

CONCLUSION

Race was not found to predict adverse OHCA outcomes in this affluent population.

Bystander vs EMS first-responder CPR: initial rhythm and outcome in witnessed nonmonitored out-of-hospital cardiac arrest

OBJECTIVES

To assess whether outcome and first-monitored rhythm for patients who sustain a witnessed, nonmonitored, out-of-hospital cardiac arrest are associated with on-scene CPR provider group.

METHODS

A retrospective, cohort analysis was conducted in a suburban, heterogeneous EMS system. Patients studied were > or = 19 years of age, had had an arrest of presumed cardiac origin between July 1989 and January 1993, had gone into cardiac arrest prior to ALS arrival, and had received CPR on collapse. First-monitored rhythms and survival rates were compared for two patient groups who on collapse either: 1) had received CPR by nonprofessional bystanders (BCPR) or 2) had received CPR by on-scene EMS system first responders (FRCPR).

RESULTS

Of 217 cardiac arrest victims, 153 (71%) had received BCPR and 64 (29%) had received FRCPR. The BCPR patients were slightly younger (62.4 vs 68.4 years, p = 0.01) and had slightly shorter ALS response intervals (6.4 vs 7.7 minutes, p = 0.02). There was no difference in BLS response time intervals or automatic external defibrillator (AED) use rates. The percentage of patients with a first-monitored rhythm of pulseless ventricular tachycardia/ventricular fibrillation (VT/VF) and the percentage of patients grouped by CPR provider who survived to hospital admission or to hospital discharge were: [see text]

Bystander CPR, ventricular fibrillation, and survival in witnessed, unmonitored out-of-hospital cardiac arrest

STUDY OBJECTIVE

To assess whether bystander CPR (BCPR) on collapse affects initial rhythm and outcome in patients with witnessed, unmonitored out-of-hospital cardiac arrest (OHCA).

DESIGN

Prospective cohort study. Student's t test, the chi 2 test, and logistic regression were used for analysis.

SETTING

Suburban emergency medical service (EMS) system.

PARTICIPANTS

Patients 19 years or older with witnessed OHCA of presumed cardiac origin who experienced cardiac arrest before EMS arrival between July 1989 and July 1993.

RESULTS

Of 722 patients who met the entry criteria, 153 received BCPR. Patients who received BCPR were younger than those who did not: 62.5 +/- 15.4 years versus 66.8 +/- 15.1 years (P < .01). We found no differences in basic or advanced life support response intervals or in frequency of AED use. More patients initially had ventricular fibrillation (VF) in the BCPR group: 80.9% versus 61.4% (P < .01). The interval to definitive care for ventricular tachycardia (VT)/VF was longer for the BCPR group (8.59 +/- 5.3 versus 7.45 +/- 4.7 minutes; P < .05). The percentage of patients discharged alive who were initially in VT/VF was higher in the BCPR group: 18.3% versus 8.4% (P < .001). In a multivariate model, BCPR is a significant predictor for VT/VF and live discharge with adjusted ORs of 2.7 (95% CI, 1.7 to 4.4) and 2.4 (95% CI, 1.5 to 4.0), respectively. For those patients in VT/VF, BCPR predicted live discharge from hospital with an adjusted OR of 2.1 (95% CI, 1.2 to 3.6).

CONCLUSION

Patients who receive BCPR are more often found in VT/VF and have an increased rate of live discharge, with controls for age and response and definitive care intervals. For VT/VF patients, BCPR is associated with an increased rate of live discharge.

Palliative surgical treatment of sixty-eight patients with carcinoma of the head of the pancreas

A retrospective study is presented of 68 patients who underwent biliary enteric bypass procedures for carcinoma of the head of the pancreas between the years of 1960 through 1975. Forty patients underwent some form of biliary enteric bypass only. Twenty-six patients were treated with concomitant gastrojejunostomy, and only two patients in this group underwent vagotomy. Two patients underwent gastrojejunostomy for obstruction at the gastric outlet without jaundice. Five operative deaths occurred among the 40 patients who underwent solely some form of biliary enteric bypass procedure, and three deaths occurred among the 26 patients who underwent concomitant gastrojejunostomy. The over-all operative mortality for biliary enteric bypass procedures was eight deaths among 68 patients. Obstruction of the duodenum developed in seven patients after undergoing a biliary enteric bypass operation. The mean postoperative interval for the development of complications was 5.57 months. All but one patient underwent a second operation, with no operative deaths. Among the 26 patients treated with concomitant gastrojejunostomy, obstruction developed in two patients because of anastomotic failure; there was massive upper gastrointestinal tract bleeding from a marginal ulcer in four patients, and one patient had a perforated marginal ulcer. The mean survival time after biliary enteric bypass was 6.69 months and after combined biliary enteric bypass and gastrojejunostomy, 9.90 months. The over-all mean survival time was 8.00 months.

Multicentricity of breast carcinoma: a case against partial mastectomy

One hundred and seventy-three mastectomies for carcinoma of the breast during a two-year period were reviewed for multicentric foci in the pathologic specimen. There was a total of 38 cases of multicentric carcinoma, comprising 22%. Sixty-two percent of all carcinomas presented as clinical Stage A and B, of these, 21% were multicentric. It is our opinion that except for certain extenuating circumstances, the procedure of choice for carcinoma of the breast is either a modified or standard radical mastectomy.