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Biomedical subjects

R Halkar

Publications and source records attributed to R Halkar.

9 recordsLinked to original sources

Nissen fundoplication improves gastric motility in patients with delayed gastric emptying.

BACKGROUND: Fundoplication hastens gastric emptying in pediatric patients with gastroesophageal reflux disease (GERD). However, among adult GERD patients with impaired gastric emptying, the degree of improvement offered by fundoplication and the value of pyloroplasty are less well defined. Therefore, we compared outcomes in GERD patients with delayed gastric emptying after fundoplication alone or fundoplication with pyloroplasty. METHODS: Of 616 consecutive GERD patients who submitted to primary fundoplication (601 laparoscopic) between October 1991 and October 1997, 82 underwent preoperative solid-phase nuclear gastric emptying analysis. Of these, 25 had delayed gastric emptying (half-time >100 min). Of 12 patients with emptying half-times between 100 and 150 min, one underwent pyloroplasty at the time of Nissen fundoplication. Of 13 patients with emptying half-times >150 min, 11 had pyloroplasty at the time of Nissen fundoplication. Patients were asked to use a 0 ("none") to 4 ("incapacitating") scale to describe the severity of their symptoms of heartburn, regurgitation, dysphagia, bloating and diarrhea preoperatively and at 6 weeks and 1 year postoperatively. Eight patients consented to a postoperative analysis of gastric emptying. RESULTS: One year after fundoplication, patients with delayed gastric emptying and controls reported a similar improvement in heartburn, regurgitation, and dysphagia, with no increase in undesirable side effects such as bloating and diarrhea. Among the patients with delayed gastric emptying who consented to undergo a repeat gastric emptying study after their operation, fundoplication alone provided a 38% improvement (p < 0.05) in gastric emptying, whereas fundoplication with pyloroplasty resulted in a 70% improvement in gastric emptying (p < 0.05). CONCLUSION: Fundoplication improves gastric emptying. The addition of pyloroplasty results in even greater improvement and may have particular value for patients with severe gastric hypomotility.

Adolescent↗

Background subtraction in technetium-99m-MAG3 renography.

UNLABELLED: Correction represents a potential source of error in estimating split renal function and camera-based clearances. The purpose of this study was to determine which of five background options and four time intervals was associated with the least error for 99mTc-mercaptoacetyltriglycine (MAG3). METHODS: Fifteen single-kidney patients were imaged supine after 111-370 MBq (3-10 mCi) 99mTc-MAG3 injection. A phantom kidney was drawn on the 2-3-min images, approximately equal in size to the solitary kidney and used for all time intervals. Counts in the phantom and native kidneys were calculated using manual inferior and lateral regions of interest (ROIs), automated elliptical and perirenal background ROIs and no background correction at various time intervals (1-2, 1-2.5, 1.5-2.5 and 2-3 min) postinjection. With optimal background correction, counts and the relative function in the phantom kidney should be zero. The error was measuring by estimating both the relative function and absolute function expressed as the percent injected dose in the phantom kidney. RESULTS: The percent injected dose in the phantom kidney as well as the error in measuring relative function were significantly greater than zero for the inferior background correction and the no background correction options at all time intervals, p < 0.05. The percent dose in the kidney and the error associated with the lateral, elliptical and perirenal ROIs were not significantly different from zero. CONCLUSION: Regardless of time interval, the greatest error was associated with no background correction. The inferior ROI consistently underestimated the background correction and probably should not be used for 99mTc-MAG3. There was no significant difference between errors generated using the lateral and automated ROIs, although automated ROIs are probably more reproducible for sequential studies.

Adult↗

Radionuclide imaging of the spleen with heat denatured technetium-99m RBC when the splenic reticuloendothelial system seems impaired.

Imaging of the spleen of 10 patients who had been hematologically diagnosed with sickle-cell anemia (SCA) was studied with [99mTc]tin colloid and heat denatured [99mTc]RBCs. In all ten patients, there was faint or nonvisualization of the spleen with [99mTc]tin colloid. However, with heat denatured [99mTc]RBCs, nine spleens were well visualized, and the uptake was homogenous. One spleen had two patchy areas of uptake. The results indicate that when splenic phagocytic function is impaired as reflected by nonvisualization of the spleen with [99mTc]tin colloid, it is still possible to image such a spleen with heat denatured [99mTc]RBCs.

Adolescent↗