Daniel L Debonis

Complications of abdominal operations for malignant disease

The incidence of morbidity and mortality in 365 consecutive patients with a mean age of 60 years who underwent intraabdominal operation for a variety of cancers involving different organ systems over a recent 2-year period was analyzed. The primary tumor sites were the esophagus (21 patients), gastroduodenum (33 patients), liver and gallbladder (6 patients), pancreas (15 patients), colorectum (101 patients), lymphoproliferative disorders (35 patients), abdominal carcinomatosis (45 patients), genitourinary and gynecologic systems (94 patients), and other sites (15 patients). One hundred eighty-two patients (49 percent) had 1 or more complications (grouped as gastrointestinal, septic, cardiopulmonary, and nonseptic) and 47 patients died (12.9 percent). The 145 patients who underwent a palliative procedure had the highest morbidity and mortality rates (41 percent and 21 percent, respectively). In the 168 patients who had curative resection, the morbidity and mortality rates were 39 percent and 9 percent, respectively, and in 51 patients with a diagnostic laparotomy, 20 percent and 4 percent, respectively. Age was not a contributory factor. The 177 malnourished patients had a significantly higher incidence of complications (72 percent) and postoperative death (23 percent) than the well-nourished patients (29 percent and 4 percent, respectively; p less than 0.001). These differences also existed with each form of complication. Of those patients without complications, the majority resumed consuming 60 percent of their caloric requirements by postoperative day 9. In the majority of patients with complications, resumption of adequate oral intake occurred by postoperative day 20.

Influence of Nutritional Status on the Resumption of Adequate Food Intake in Patients Recovering from Colorectal Cancer Operations

The influence of nutritional status on the resumption of adequate food intake in 101 patients recovering from colorectal cancer operation was examined. Two thirds of these patients were well-nourished; the others were malnourished. Malnutrition criteria were serum albumin of less than 3.5 gm per dl plus any two of the following four factors: recent weight loss greater than 10 per cent or weight for height, mid-arm circumference, and triceps skinfold thickness lower than the tenth percentile. Over half of the well-nourished patients were eating 60 per cent or greater of their caloric requirements by the tenth postoperative day, whereas only one quarter of the malnourished patients had attained this intake. the morbidity and mortality in 33 malnourished patients was 52 and 12 per cent, respectively, compared with 31 and 6 per cent (p less than 0.01) in 68 nourished patients. The duration of postoperative functional starvation in malnourished patients without complications increased to an average of 22 days following a complication and was further prolonged after a complication. Age or operative procedure (curative or palliative) did not influence complication rate. Our data suggest that postoperative nutritional support as either TPN or enteral feeding using an elemental diet is indicated in malnourished patients and in well-nourished patients immediately following a complication requiring therapeutic intervention.

Factors predictive of the status of sentinel lymph nodes in melanoma patients from a large multicenter database.

BackgroundNumerous predictive factors for cutaneous melanoma metastases to sentinel lymph nodes have been identified; however, few have been found to be reproducibly significant. This study investigated the significance of factors for predicting regional nodal disease in cutaneous melanoma using a large multicenter database.MethodsSeventeen institutions submitted retrospective and prospective data on 3463 patients undergoing sentinel lymph node (SLN) biopsy for primary melanoma. Multiple demographic and tumor factors were analyzed for correlation with a positive SLN. Univariate and multivariate statistical analyses were performed.ResultsOf 3445 analyzable patients, 561 (16.3%) had a positive SLN biopsy. In multivariate analysis of 1526 patients with complete records for 10 variables, increasing Breslow thickness, lymphovascular invasion, ulceration, younger age, the absence of regression, and tumor location on the trunk were statistically significant predictors of a positive SLN.ConclusionsThese results confirm the predictive significance of the well-established variables of Breslow thickness, ulceration, age, and location, as well as consistently reported but less well-established variables such as lymphovascular invasion. In addition, the presence of regression was associated with a lower likelihood of a positive SLN. Consideration of multiple tumor parameters should influence the decision for SLN biopsy and the estimation of nodal metastatic disease risk.

NUTRITIONAL SUPPORT IN CANCER

Anderson and Keys, described a method for measuring blood cholesterol levels on dried serum on filterpaper for epidemiological work in 1956. However, their method is not appropriate for neonatal mass-screening, because blood has to be taken by syringe, serum must be separated before measurement, and extraction and determination are complex. Our method is very easy and can be done at the same time in neonatal mass screening tests for phenylketonuria or maple-syrup-urine disease, for example. We also measured serum cholesterol concentrations in this way on blood-spotted filterpapers for 292 newborn babies in sixty hospitals. The results mean value was l80.2:t34.8 8 (SD) mg/dl. This new screening method should permit detection of homozygotes or heterozygotes for familial hypercholesterolaemia in neonatal mass-screening tests. The cut-offlevels ofODsoo will have to be determined by individual laboratories, in the light of national, racial, or local difference in blood cholesterol levels.

Use of 20% fat emulsion in total parenteral nutrition.

Sixteen elderly postoperative patients were randomized in a crossover study comparing isocaloric volumes of 20% and 10% fat emulsions used for total parenteral nutrition (TPN). The caloric intake was maintained constant during the two 7-day periods of each infusion. The indices measured after each period were total volume of fluid administered, change in body weight, hematocrit, serum sodium, creatinine, albumin, blood urea nitrogen, glucose, inorganic phosphate, and cholesterol. The total volume of 10% isocaloric nutrient solution was significantly (p < .05) greater than that of the 20% solution. A rise in body weight and a fall in serum indices of hydration status were observed; five patients developed clinical signs of overhydration while on the 10% solution. These changes did not occur with the 20% solution. Thus, isocaloric substitution of a 20% fat emulsion for a 10% fat emulsion with TPN prevented overhydration and hemodilution without compromising nutrient intake.

Past, Present, and Future of Fluorescence

It is important to define fluorescence. There are several ways to describe this term: (1) the emission of electromagnetic radiation, especially of visible light, stimulated in a substance by the absorption of incident radiation and persisting only as long as the stimulating radiation is continued. (2) Emitting light during exposure to radiation from an external source. (3) Luminescence that is caused by the absorption of radiation at one wavelength followed by nearly immediate reradiation usually at a different wavelength and that ceases almost at once when the incident radiation stops. The common denominators for this term are a source of radiation, the absorption of this radiation, and the emission of a modified radiation that ends immediately as the source stops emitting radiation. Chemically speaking, fluorescence is brought about by absorption of photons in the singlet ground state promoted to a singlet excited state. The spin of the electron is still paired with the ground state electron. As the excited molecule returns to ground state, it involves the emission of a photon of lower energy, which corresponds to a longer wavelength, than the absorbed photon and therefore lower energy, than the absorbed radiation.