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Background: For nearly two decades, interest in general surgery has been declining among U.S. medical school graduates. Many factors appear to be important in a medical student's choice of a surgical residency and career. We hypothesized that previous exposure to family members who are surgeons would significantly influence a student's decision to pursue a career in surgery., Methods: Since 2001, nearly 600 third-year medical students completing the general surgery clerkship were issued a pre- and post-clerkship survey. Responses were collected, retrospectively analyzed, and correlated to the 2001-2007 National Residency Matching Program match results., Results: The response rate of students completing both surveys was 87% (n = 510). Based on a numeric scale, surgical progeny (SP) indicated a significantly higher likelihood than nonsurgical progeny (NSP) of pursing a surgical career/residency in the pre-clerkship period (SP mean, 5.1 +/- 0.42; NSP mean, 3.7 +/- 0.11; P = 0.0005). Post-clerkship, SPs noted no more enjoyment from the surgical clerkship than NSPs (SP mean, 7.2 +/- 0.25; NSP mean, 6.9 +/- 0.96; P = 0.91); furthermore, there was no difference in the percentage of students pursuing a surgical residency (categorical or surgical subspecialty) in the National Residency Matching Program match (SP, 12.5%; NSP, 12.7%; P = 1.00)., Conclusion: These data suggest that previous exposure to a surgeon within the family positively influences a medical student's pre-clerkship interest in pursuing a surgical career. However, this interest is not sustained; SPs and NSPs match into surgical residencies at equivalent rates. Clearly, further studies are needed to identify the factors responsible for this phenomenon.

Background: Recent changes in medical education have emphasized primary care careers. This could have a negative impact on the number of applicants to surgical residencies. We hypothesized that experiences during the third year surgical clerkship are influential for students' subsequent residency choice., Materials and Methods: Third year medical students who completed their surgical clerkship in the 2001-02 academic year were surveyed pre- and post-surgical clerkship. Responses were analyzed and correlated to the 2003 match results., Results: The response rate of students surveyed was 98% (82 surveys/83 match results). Pre-clerkship, 6/82 students (7%) expressed an interest in surgery or surgical subspecialty careers. Post-clerkship, 34/84 students (40%) expressed an increased interest a surgical career; 13/84 (15%) expressed a decreased interest, and 37% of students expressed no change in career interest. Of those students expressing an increased interest in surgery, the clerkship experiences most noted to be influential were (1) number of cases participated/scrubbed (95%), (2) resident interaction (85%), (3) faculty interaction (80%), and (4) number of cases observed (65%). The number of hours spent on rotation (call, rounds) was the leading experience associated with a decreased interest in a surgical career. 12/83 students surveyed (14%) ultimately matched into a surgical program (NRMP 2003 match results)., Conclusions: These data suggest that operative exposure and interaction with residents and faculty have a positive influence in students' choice of a surgical career. Although only 6% of students expressed an interest in surgery pre-clerkship, a 2-fold increase in this number was noted in choice of residency (14%). Work hours were the primary negative indicator for surgery residency. As medical curriculum is restructured and surgical exposure decreased, these data underscore the importance of quality exposure to both procedures and role models during the 3rd year surgical clerkship.

The effects of portal hypertension on gut function may be mediated by venous congestion and altered circulating levels of enteric hormones and neuropeptides. We designed this study to determine the effects of chronic intestinal venous hypertension (VHT), in isolation, on gut motility and absorption. In 10 dogs, a 20- to 25-cm loop of jejunum was isolated from the fecal stream, but myoneural continuity was maintained with the proximal bowel by a seromuscular bridge. In 5 dogs, VHT was created in the loop by a fixed stenosis of its venous drainage; a sham procedure was performed in a further 5 animals. Serosal monopolar electrodes were placed in all animals. Absorptive function and myoelectrical activity were studied over a 4-week period. Venous hypertension was achieved and sustained in the VHT animals; loop vein pressures for VHT vs control in cm H2O (means +/- SEM) are: initial--29.8 +/- 1.8 vs 7.5 +/- 0.4 (P less than 0.01), and at 4 weeks--17.6 +/- 6.88 vs 7.3 +/- 0.2 (P less than 0.01). Absorption of Na+, Cl-, glucose, and water was impaired in VHT loops. Normal patterns of fasting and postprandial myoelectrical activity were preserved in the VHT animals. We conclude that chronic VHT, in the absence of portosystemic shunting, results in impaired absorption of water, glucose, and electrolytes without any change in intestinal motility.

Previous investigations have shown that animals maintained with enteral nutrition are better able to survive an intraperitoneal bacterial challenge than animals receiving parenteral nutrition. The aim of this study was to assess the effects of enteral and parenteral nutrition on reticuloendothelial function. Eighteen enteral-fed male Sprague-Dawley rats had access to a standard hyperalimentation solution via a sipper tube ad libitum. Seventeen parenteral-fed animals received the same solution at an infusion rate determined by the volume ingested by the pair-fed enteral animals. All animals had central venous catheters. After 12 days, reticuloendothelial function was assessed by measuring the clearance rate (K) and the organ distribution of intravenous 51Cr-labeled sheep red blood cells and by plasma fibronectin levels. Nutritional status was assessed by body weight and nitrogen balance. K values in enteral and parenteral animals were similar (0.110 +/- 0.011 and 0.140 +/- 0.012, respectively, mean +/- SEM) as were plasma fibronectin levels (196 +/- 22 and 228 +/- 15 micrograms, respectively). Organ distribution of the 51Cr-labeled sheep red blood cells was the same in both groups. Nitrogen balance and body weights were also similar in both groups. These data demonstrate that in this experimental model enteral nutrition and parenteral nutrition were equally effective at maintaining reticuloendothelial function and nutritional status.

A rat model was used to investigate the effects of starvation and protein depletion on serum fibronectin levels and reticuloendothelial function. Serum fibronectin levels decreased significantly following both test diets. The uptake of opsonin-independent test agents was minimally affected by starvation and protein depletion. Clearance of gelatinized colloidal carbon, which is dependent on circulating opsonins, was significantly reduced in the malnourished animals. This clearance defect was corrected by incubation of colloidal carbon with normal serum. These data suggest that reticuloendothelial dysfunction secondary to malnutrition is primarily mediated by a deficiency of circulating opsonins.

Both hepatic injury and partial resection are followed by elevation of serum alpha-fetoprotein (AFP). However, whether injured or regenerating hepatocytes are the site of AFP secretion remains controversial. The effects of 3.5 hr of selective hepatic ischemia to the left (L) lobes (70% hepatic mass) of the canine liver on AFP production and liver regeneration by both L and right (R) hepatic lobes are reported. Twenty-one experimental and 13 control animals were studied. AFP was measured by radioimmunoassay in liver tissue homogenates and serum from both systemic and hepatic venous blood obtained preoperatively and on postoperative Days 2, 4, 6, 7, and 8. Tissue AFP was also assessed by immunofluorescent staining. Hepatic regeneration was quantified by autoradiography and DNA specific activity following the intravenous administration of [3H]thymidine. AFP levels were increased above baseline by postoperative Day 4 in biopsies taken from both L and R liver lobes with peak values occurring on Day 7. Immunofluorescent staining confirmed the presence of intracellular AFP in hepatocytes of both R and L lobes on postoperative Days 2 through 6. Serum AFP became significantly elevated above preoperative values by Day 4 and maximal on Day 6. No difference was observed in AFP levels in systemic, L, or R hepatic venous blood. Hepatocellular DNA synthesis was increased on postoperative Days 2 through 8 in both R and L liver lobes. In conclusion, selective hepatic ischemia results in AFP secretion by both injured and uninjured liver lobes. These results suggest that both regenerating and injured hepatocytes synthesize AFP in the dog.