[Role of rifaximin in the treatment of colonic diverticular disease]

Diverticular disease of the colon is the fifth most important gastrointestinal disease in terms of direct and indirect healthcare costs in western countries. Although most patients with colonic diverticula remain asymptomatic for their whole life, in 20-25% of cases will develop symptoms. Antibiotics are commonly used in the treatment of inflammatory complication of diverticular disease. Several clinical observation suggest a role of rifaximin in the management of symptomatic uncomplicated diverticular disease of the colon. This is a critical review of clinical studies addressing the role of long term administration of rifaximin for the treatment of symptomatic colonic diverticular disease. The evidence from prospective controlled trials suggests that rifaximin is effective for obtaining symptomatic relief in patients with uncomplicated diverticular disease. The therapeutic gain compared with fiber supplementation only is approximately 30%. No definitive conclusion can be drawn regard a possible role of rifaximin for preventing diverticulitis.

A randomised controlled pilot trial to evaluate and optimize the use of anti-platelet agents in the perioperative management in patients undergoing general and abdominal surgery--the APAP trial (ISRCTN45810007)

PURPOSE

Surgeons are increasingly confronted by patients on long-term low-dose acetylsalicylic acid (ASA). However, owing to a lack of evidence-based data, a widely accepted consensus on the perioperative management of these patients in the setting of non-cardiac surgery has not yet been reached. Primary objective was to evaluate the safety of continuous versus discontinuous use of ASA in the perioperative period in elective general or abdominal surgery.

METHODS

Fifty-two patients undergoing elective cholecystectomy, inguinal hernia repair or colonic/colorectal surgery were recruited to this pilot study. According to cardiological evaluation, non-high-risk patients who were on long-term treatment with low-dose ASA were eligible for inclusion. Patients were allocated randomly to continuous use of ASA or discontinuation of ASA intake for 5 days before until 5 days after surgery. The primary outcome was the incidence of major haemorrhagic and thromboembolic complications within 30 days after surgery.

RESULTS

A total of 26 patients were allocated to each study group. One patient (3.8%) in the ASA continuation group required re-operation due to post-operative haemorrhage. In neither study group, further bleeding complications occurred. No clinically apparent thromboembolic events were reported in the ASA continuation and the ASA discontinuation group. Furthermore, there were no significant differences between both study groups in the secondary endpoints.

CONCLUSIONS

Perioperative intake of ASA does not seem to influence the incidence of severe bleeding in non-high-risk patients undergoing elective general or abdominal surgery. Further, adequately powered trials are required to confirm the findings of this study.

Randomised clinical trial: the efficacy and safety of propionyl-L-carnitine therapy in patients with ulcerative colitis receiving stable oral treatment

BACKGROUND

Ulcerative colitis (UC) is characterised by impaired fatty-acid oxidation; l-carnitine has a key role in fatty-acid metabolism and short-chain fatty acids such as butyrate and propionate are important energy source for intestinal epithelial cells.

AIM

To evaluate efficacy and safety of colon-release propionyl-L-carnitine (PLC) in patients with mild-to-moderate UC receiving stable oral aminosalicylate or thiopurine therapy.

METHODS

In a multicentre, phase II, double-blind, parallel-group trial, patients were randomised to receive PLC 1 g/day, PLC 2 g/day or placebo. Main inclusion criteria were as follows: age 18-75; disease activity index (DAI) score 3-10 inclusive, be under oral stable treatment with aminosalicylate or thiopurine. The primary endpoint was clinical/endoscopic response, defined as a decrease in DAI score ≥ 3 points or remission, defined as a DAI score ≤ 2 with no individual sub-score > 1.

RESULTS

Of 121 patients who were randomised, 57 of 79 (72%) patients receiving PLC (combined 1 g and 2 g cohort) had a clinical/endoscopic response vs. 20 of 40 (50%) receiving placebo (P = 0.02). Specifically, in PLC 1 g/day group, 30 of 40 (75%) patients had clinical/endoscopic response (P = 0.02 vs. placebo) and 27 of 39 (69%) in the PLC 2 g/day group (P = 0.08 vs. placebo). Rates of remission were 22/40 (55%), 19/39 (49%), 14/40 (35%) in the PLC 1 g, PLC 2 g, and placebo groups, respectively. PLC had a similar safety profile to placebo; the most common adverse events were gastrointestinal.

CONCLUSION

Propionyl-L-carnitine 1 g/day should be investigated further as a co-treatment for mild-to-moderate ulcerative colitis (NCT-01026857).

Tumor necrosis factor alpha inhibitors as immunomodulatory antirejection agents after intestinal transplantation

We reported the successful administration of infliximab for late-onset OKT3-resistant rejection in two patients, who presented persistent ulcerative inflammation of the ileal graft after intestinal transplantation (ITX). Based on this experience, the present study demonstrated our long-term experience with infliximab for different types of rejection-related and inflammatory allograft alterations. Infliximab administration (5 mg/kg body weight (BW)) was initiated at a mean of 18.2 ± 14.1 months after transplantation. The number of administrations per patient averaged 8.4 ± 6.7. Repeat dosing was timed according to clinical signs and graft histology in addition to serum-levels of tumor necrosis factor alpha (TNFα), lipopolysaccharide binding protein (LBP) and C-reactive protein (CRP). Infliximab was successful in the following patients: patients with late-onset OKT3- and steroid-refractory rejection who presented persistent ulcerative alterations of the ileal graft (n = 5), patients with ulcerative ileitis/anastomositis, who did not show typical histological rejection signs (n = 2), and one patient with early-onset OKT3-resistant rejection. Infliximab was not successful in one patient with early-onset OKT3-resistant rejection that was accompanied by treatment-refractory humoral rejection. In conclusion, infliximab can expand therapeutic options for late-onset OKT3- and steroid-refractory rejection and chronic inflammatory graft alterations in intestinal allograft recipients.

Meta-analysis: long-term therapy with rifaximin in the management of uncomplicated diverticular disease

BACKGROUND

Diverticular disease of the colon is a common gastrointestinal disease. Although most patients remain asymptomatic for their whole life, about 20-25% present symptoms related to 'diverticular disease'. Several randomised trials verified efficacy of a poorly absorbed antibiotic, such as rifaximin-α (rifaximin), in soothing symptoms and preventing diverticulitis.

AIM

To evaluate the long-term efficacy administration of rifaximin plus fibre supplementation vs. fibre supplementation alone, on symptoms and complications, in patient with symptomatic uncomplicated diverticular disease.

METHODS

Pertinent studies were selected from the Medline, and the Cochrane Library Databases, references from published articles and reviews. Conventional meta-analysis according to DerSimonian and Laird method was used for the pooling of the results. The outcomes were 1- year complete symptom relief, and 1- year complication incidence. The rate difference (RD, with 95% CI) and the Number Needed to Treat (NNT) were used as measure of the therapeutic effect on each outcome.

RESULTS

Four prospective randomised trials including 1660 patients were selected. The pooled RD for symptom relief was 29.0% (rifaximin vs. control; 95% CI 24.5-33.6%; P<0.0001; NNT=3). The pooled RD for complication rate was -1.7% in favour of rifaximin (95% CI -3.2 to -0.1%; P=0.03; NNT=59). When considering only acute diverticulitis, the pooled RD in the treatment group was -2% (95% CI -3.4 to -0.6%; P=0.0057; NNT=50).

CONCLUSIONS

In symptomatic uncomplicated diverticular disease, treatment with rifaximin plus fibre supplementation is effective in obtaining symptom relief and preventing complications at 1 year.

Postoperative course and clinical significance of biochemical blood tests following hepatic resection

BACKGROUND

Hepatic resection continues to be associated with substantial morbidity. Although biochemical tests are important for the early diagnosis of complications, there is limited information on their postoperative changes in relation to outcome in patients with surgery-related morbidity.

METHODS

A total of 835 consecutive patients underwent hepatic resection between January 2002 and January 2008. Biochemical blood tests were assessed before, and 1, 3, 5 and 7 days after surgery. Analyses were stratified according to the extent of resection (3 or fewer versus more than 3 segments).

RESULTS

A total of 451 patients (54·0 per cent) underwent resection of three or fewer anatomical segments; resection of more than three segments was performed in 384 (46·0 per cent). Surgery-related morbidity was documented in 258 patients (30·9 per cent) and occurred more frequently in patients who had a major resection (P = 0·001). Serum bilirubin and international normalized ratio as measures of serial hepatic function differed significantly depending on the extent of resection. Furthermore, they were significantly affected in patients with complications, irrespective of the extent of resection. The extent of resection had, however, little impact on renal function and haemoglobin levels. Surgery-related morbidity caused an increase in C-reactive protein levels only after a minor resection.

CONCLUSION

Biochemical data may help to recognize surgery-related complications early during the postoperative course, and serve as the basis for the definition of complications after hepatic resection.

Low-cost and Chemical Resistant Microfluidic Devices Based on Thermoplastic Elastomers for a Novel Biosensor System

Low-cost and chemical resistant microfluidic devices based on thermoplastic elastomers have been fabricated by hot embossing technology. Commercial available thermoplastic elastomer foils based on polyurethane (PU) in a thickness range of 100-600 μm have been used. Prior to the fabrication of the microfluidic devices the chemical resistance of the material against a wide range of standard biological buffer solutions and solvents had been analysed. We created systems of channels, reservoirs and holes for the connections to external capillaries by double-sided hot embossing with an alignment accuracy of +/- 3 micrometer. Closed channel structures were produced by an additional chemical bonding process of the embossed devices with another thermoplastic elastomer foil. The total volume of the fluidic cell was 2 μl/sensor for the use with SAW (surface-acoustic wave) sensor chip and about 0.2 μ/sensor for the impedance sensors. A novel multi-chamber fluidic device was successfully tested for in-situ immobilization of thrombin antibodies and Bovin Serum Albumin (BSA) on different sensor elements of the same sensor chip.

Intraoperative sonography: a technique for localizing focal forms of congenital hyperinsulinism in the pancreas

Congenital hyperinsulinism (CHI), syn. nesidioblastosis, is the most frequent cause of persistent, recurrent hypoglycemia in infancy. One third of patients show a single circumscribed focus. Enucleation of the focus and the removal of all affected β-cells with preservation of healthy tissue is the treatment of choice. The intrapancreatic choledochus as well as the ductus pancreaticus major must remain intact. The diagnostic gold standard is 18F-DOPA-PET/CT. Intraoperative sonography is carried out to correctly visualize the focus preoperatively localized by PET/CT in situ during the operation. The enucleation of the focus was carried out 3 - 20 days after PET/CT in 5 patients at an age of 3.5 - 14 months. Intraoperative ultrasound was carried out with high-capacity devices of different manufacturers under use of broadband probes (9 - 14 MHz). The localization by intraoperative ultrasound was accurate in all 5 patients with focal CHI, with regard to the intraoperative localization as previously described by PET/CT and histology. D. choledochus and D. pancreaticus major were separated intraoperatively by ultrasound. 3 of 5 patients were cured by complete enucleation of the focus. Nevertheless, the entire intraoperative identification of the segmented focus is still problematic. Characteristic sonographic features of a CHI focus are: hypoechogenicity, variable homogeneous and inhomogenous texture, blurred, irregular limitation without capsule, filiform, lobular processes, and insular dispersal into the surrounding tissue. Intraoperative high-resolution sonography helps the pediatric surgeon to determine size, configuration and topography of a CHI focus.

Leucocyte-depleted blood transfusion is an independent predictor of surgical morbidity in patients undergoing elective colon cancer surgery-a single-center analysis of 531 patients

BACKGROUND

Leukocyte-depleted packed red blood cells (PRBC) were introduced to reduce potential immunomodulatory effects and transfusion-associated morbidity. It has, however, remained unclear, if leucocyte depletion prevents negative side effects of blood transfusion. The aim of this analysis was to examine the effects of leukocyte-depleted PRBC on surgical morbidity after elective colon cancer surgery.

METHODS

Data were prospectively collected from 531 consecutive patients undergoing elective colon cancer surgery at a single high-volume center (University Hospital) from 2002 to 2008. Potentially predictive factors for surgical morbidity were tested on univariate and multivariate analysis.

RESULTS

A total of 531 patients with colon cancer were included. A curative (R0) resection was performed in 497 patients (94%). The mortality rate, overall morbidity rate, and surgical morbidity rate were 1.1, 33, and 21%, respectively. Some 135 patients (25%) received perioperative transfusion of PRBCs. On multivariate analysis age (odds ratio [OR] 1.04, 95% confidence interval [95% CI] 1.02-1.06; P = 0.001), BMI (OR 1.08, 95% CI 1.03-1.13; P = 0.003), and PRBC transfusion (2.4, 1.41-4.11; P = 0.001) were revealed as independent predictors of surgical morbidity. The risk of surgical complications increased continuously with the amount of transfused PRBCs. The adverse impact of PRBC transfusion was neither restricted to the timepoint of transfusion (intraoperative or postoperative), nor to the kind of complication (infectious vs noninfectious complication).

CONCLUSION

Perioperative transfusion of leukocyte-depleted PRBCs has a significantly negative effect on surgical morbidity of patients undergoing elective colon cancer surgery. The use of perioperative blood transfusions in these patients should be avoided, whenever possible.

Expression of an ASCL2 related stem cell signature and IGF2 in colorectal cancer liver metastases with 11p15.5 gain

BACKGROUND AND AIMS

Liver metastases are the leading cause of death in colorectal cancer. To gain better insight into the biology of metastasis and possibly identify new therapeutic targets we systematically investigated liver-metastasis-specific molecular aberrations.

METHODS

Primary colorectal cancer (pCRC) and matched liver metastases (LMs) from the same patients were analysed by microarray-based comparative genomic hybridisation in 21 pairs and gene expression profiling in 18 pairs. Publicly available databases were used to confirm findings in independent datasets.

RESULTS

Chromosome aberration patterns and expression profiles of pCRC and matched LMs were strikingly similar. Unsupervised cluster analysis of genomic data showed that 20/21 pairs were more similar to each other than to any other analysed tumour. A median of only 11 aberrations per patient was found to be different between pCRC and LM, and expression of only 16 genes was overall changed upon metastasis. One region on chromosome band 11p15.5 showed a characteristic gain in LMs in 6/21 patients. This gain could be confirmed in an independent dataset of LMs (n=50). Localised within this region, the growth factor IGF2 (p=0.003) and the intestinal stem cell specific transcription factor ASCL2 (p=0.029) were found to be over-expressed in affected LM. Several ASCL2 target genes were upregulated in this subgroup of LM, including the intestinal stem cell marker OLFM4 (p=0.013). The correlation between ASCL2 expression and four known direct transcriptional targets (LGR5, EPHB3, ETS2 and SOX9) could be confirmed in an independent expression dataset (n=50).

CONCLUSIONS

With unprecedented resolution a striking conservation of genomic alterations was demonstrated in liver metastases, suggesting that metastasis typically occurs after the pCRC has fully matured. In addition, we characterised a subset of liver metastases with an ASCL2-related stem-cell signature likely to affect metastatic behaviour of tumour cells.

[Mini-endoscopy in the head and neck region]

Minimally invasive, in particular endoscopic treatment modalities are an important topic in medicine today. Over the last 15 years mini-endoscopy (ME) has been introduced and established in different fields of the head and neck region. ME includes endoscopy of the Eustachian tube, middle ear, lacrimal duct system and duct system of the major salivary glands. Direct visualization by endoscopy enables rapid, efficient and accurate diagnosis and treatment planning according to the findings. In the majority of cases simultaneous interventional therapy is possible. This has lead to a fundamental change in treatment regimes which now aim to preserve the anatomic structure and function. In specialized centers the frequency of external dacryocystostomy could be reduced to less than 10% by means of endoscopic surgery of the lacrimal system, while the frequency of parotidectomy was reduced to below 5%. This development allows not only for medical advances, but also for the desired cost reduction on the part of the administrative organs responsible for providing medical care.

Pathways of propionate degradation by enriched methanogenic cultures

A mixed methanogenic culture was highly enriched in a growth medium containing propionate as the sole organic carbon and energy source. With this culture, the pathways of propionate degradation were studied by use of C-radiotracers. Propionate was first metabolized to acetate, carbon dioxide, and hydrogen by nonmethanogenic organisms. Formate was not excreted. The carbon dioxide originated exclusively from the carboxyl group of propionate, whereas both [2-C]- and [3-C]propionate lead to the production of radioactive acetate. The methyl and carboxyl groups of the acetate produced were equally labeled, regardless of whether [2-C]- or [3-C]propionate was used. These observations suggest that in the culture, propionate was degraded through a randomizing pathway.

Methanogenesis in a Thermophilic (58 degrees C) Anaerobic Digestor: Methanothrix sp. as an Important Aceticlastic Methanogen

Aceticlastic methanogens and other microbial groups were enumerated in a 58 degrees C laboratory-scale (3 liter) anaerobic digestor which was fed air-classified municipal refuse, a lignocellulosic waste (loading rate = 1.8 to 2.7 g of volatile solids per liter per day; retention time = 10 days). Two weeks after start-up, Methanosarcina sp. was present in high numbers (10 to 10 CFU/ml) and autofluorescent Methanosarcina-like clumps were abundant in sludge examined by using epifluorescence microscopy. After about 4 months of digestor operation, numbers of Methanosarcina sp. dropped 2 to 3 orders of magnitude and large numbers (most probable number = 10 to 10/ml) of a thermophilic aceticlastic methanogen morphologically resembing Methanothrix sp. were found. Methanothrix sp. had apparently displaced Methanosarcina sp. as the dominant aceticlastic methanogen in the digestor. During the period when Methanothrix sp. was apparently dominant, acetate concentrations varied between 0.3 and 1.5 mumol/ml during the daily feeding cycle, and acetate was the precursor of 63 to 66% of the methane produced during peak digestor methanogenesis. The apparent K(m) value obtained for methanogenesis from acetate, 0.3 mumol/ml, indicated that the aceticlastic methanogens were nearly saturated for substrate during most of the digestor cycle. CO(2)-reducing methanogens were capable of methanogenesis at rates more than 12 times greater than those usually found in the digestor. Added propionate (4.5 mumol/ml) was metabolized slowly by the digestor populations and slightly inhibited methanogenesis. Added n-butyrate, isobutyrate, or n-valerate (4.5 mumol/ml each) were broken down within 24 h. Isobutyrate was oxidized to acetate, a novel reaction possibly involving isomerization to n-butyrate. The rapid growth rate and versatile metabolism of Methanosarcina sp. make it a likely organism to be involved in start-up, whereas the low K(m) value of Methanothrix sp. for acetate may cause it to be favored in stable digestors operated with long retention times.

[Stenosis and other non-sialolithiasis-related obstructions of the major salivary gland ducts. Modern treatment concepts]

The treatment of stenoses and non-stone-related obstructive diseases of the major salivary glands has undergone significant changes due to the development of minimally invasive treatment modalities. Correct diagnosis can often not be established in detail with all diagnostic tools except sialendoscopy, which is necessary for gland-preserving therapy. Over the last 10 years a range of minimally invasive treatment approaches aimed at preserving gland function have been developed. In addition to sialography-controlled therapy, interventional sialendoscopy plays a central role, representing the treatment of first choice in all stenoses and non-stone-related obstructions of the salivary duct system and with a success rate of about 85%-90%. By combining sialendoscopy with other minimally invasive surgical procedures, the function of the gland can be preserved in more than 95%. Thus sialendoscopy plays a crucial role in the treatment of non-stone-related obstructive diseases of the major salivary glands. In stenoses of the salivary gland ducts extirpation of the gland should be considered only as a last step.

[Chronic recurrent parotitis]

Chronic recurrent parotitis is a non-obstructive disease with episodes of mostly painful swelling of the gland. It is categorized into a juvenile and an adult form, even without clear information on its actual origin. As to the etiology of the juvenile form, genetic factors and duct malformations as well as bacterial infections are discussed. Very rarely a complete lymphatic transformation of the gland might take place. Juvenile chronic recurrent parotitis is self-limiting in about 90% of all cases, as patients grow up. The diagnosis is based on patient history and clinical findings. Sonography is the imaging method of choice. Sialendoscopy shows a typical whitish pattern of the ducts in juvenile disease. Strictures or stenoses are typical for the adult form. The therapy of choice is gland massage and sialagogues, in addition to the administration of antibiotics. In more severe cases sialendoscopy together with rinsing of the ducts and instillation of cortisone are indicated. Total parotidectomy remains the last choice and is rarely necessary.

[Modern concepts for the diagnosis and therapy of sialolithiasis]

Sialoliths are the underlying cause of salivary gland obstructive disease in 60%-70% of cases. Modern minimally invasive techniques have enabled accurate diagnosis and findings-specific therapy with the aim of full gland-function preservation. This article provides an overview of the current diagnostic measures for and therapy of sialolithaisis. Ultrasound is the investigation of first choice and is able to recognize stones in well over 90% of cases. Sialendoscopy is a directly visualizing technique which is superior to all other diagnostic measures for the assessment of pathologic changes in the salivary duct system and the detection of stones. Treatment was significantly improved with the introduction of extracorporal shock wave lithotripsy (ESWL), sialographic-controlled techniques, surgical procedures of the duct system and in particular by interventional sialendoscopy. Interventional sialendoscopy, especially when combined with other treatment modalities, has a success rate of 85%-95%. Cases which respond poorly to therapy can be treated successfully with the endoscopic transcutaneous approach in about 90% of cases. When sialendoscopy is performed in combination with other minimally invasive treatment options the gland can be preserved in 95%-98% of all cases.

Cardiotoxicity and other adverse events associated with mitoxantrone treatment for MS

BACKGROUND

Mitoxantrone is used for aggressive multiple sclerosis (MS), but concerns about safety, including cardiotoxicity and other laboratory measures, prevail.

OBJECTIVE

To evaluate the incidence and potential predictors of adverse events associated with mitoxantrone at the MS Clinic, University of British Columbia, Canada.

METHODS

Retrospective review of patients treated with mitoxantrone by standard protocol; maximum cumulative dose = 120 mg/m(2). Left ventricular ejection fraction (LVEF) was measured with regular multiple-gated acquisition (MUGA) scans; blood cell counts and biochemical liver tests were performed before infusions. Generalized estimating equations were used to examine potential predictors of adverse events (graded according to the Common Toxicity Criteria, version 4) in patients with normal baseline and > or =1 follow-up MUGA or laboratory assessment.

RESULTS

All 163 patients (58% women) treated with mitoxantrone from 1999 to 2007 were reviewed. Mean baseline age was 41.9 (SD 10.8) years, cumulative dose was 59.7 (SD 26.0) mg/m(2), and median follow-up duration was 14 months (maximum 6.5 years). By study end, 14% developed de novo cardiotoxicity (grade > or =2) as measured by decreased LVEF, 27% neutropenia (grade > or =1), 15% anemia (grade > or =1), and 15% liver toxicity (grade > or =1). Possible predictors of adverse events included sex, age, disease duration, and cumulative dose; only women exposed to a higher cumulative dose were at a greater risk of anemia (adjusted odds ratio 1.26, 95% confidence interval 1.08-1.48 per 10 mg/m(2)).

CONCLUSIONS

Based on cardiac and laboratory assessments, mitoxantrone was reasonably well tolerated. However, cardiotoxicity was evident after doses well below current maximum recommended levels. A dose-response effect was not apparent. Findings emphasize the importance of monitoring; the long-term effects of mitoxantrone in multiple sclerosis require investigation.

Disease onset in familial and sporadic primary progressive multiple sclerosis

The pathophysiology of primary progressive (PP) multiple sclerosis (MS) involves diffuse axonal degeneration which is believed to start early in the disease process, even before the onset of clinical symptoms. Symptomatic onset then occurs when this process reaches a threshold after which the axonal loss can no longer be compensated. A preliminary study showed that patients with familial PPMS had an earlier clinical onset than patients with sporadic disease, suggesting a hereditary component to the disease process of PPMS. In this study, we combined data from two large, population-based, longitudinal MS databases to investigate disease onset in familial and sporadic PPMS. We examined 411 patients with PPMS. There were no differences in gender distribution or onset symptoms between familial and sporadic PPMS. Patients with familial PPMS were significantly younger at disease onset (n = 84, median age: 37.6 years) than patients with sporadic disease (n = 327, median age: 42.7, p = 0.007). This difference was due to a greater proportion of familial cases with a disease onset before the age of 30 and a smaller proportion with disease onset between 40 and 50 years of age (p = 0.002). Gender had no significant effect on the age at disease onset. Further analyses showed that these findings were unlikely to be due to ascertainment bias towards an earlier diagnosis in familial cases. Our findings suggest a hereditary component to the disease process of PPMS. It would be worthwhile to identify patients with familial PPMS for future research on disease modifying genes in MS.

Diffused Matrix Format: a new storage and processing format for airborne hyperspectral sensor images

At present, hyperspectral images are mainly obtained with airborne sensors that are subject to turbulences while the spectrometer is acquiring the data. Therefore, geometric corrections are required to produce spatially correct images for visual interpretation and change detection analysis. This paper analyzes the data acquisition process of airborne sensors. The main objective is to propose a new data format called Diffused Matrix Format (DMF) adapted to the sensor's characteristics including its spectral and spatial information. The second objective is to compare the accuracy of the quantitative maps derived by using the DMF data structure with those obtained from raster images based on traditional data structures. Results show that DMF processing is more accurate and straightforward than conventional image processing of remotely sensed data with the advantage that the DMF file structure requires less storage space than other data formats. In addition the data processing time does not increase when DMF is used.