Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Study shows splitting bowel preparation dosage is most effective cleansing method before colonoscopy

06.08.2010
A new study from researchers in Italy has found that a split-dosage schedule of bowel (colon) preparation is the most effective method for bowel cleansing before colonoscopy. Colonoscopies performed within six to eight hours of the end of preparation were associated with significantly better cleansing than those performed more than eight hours after the end of preparation.

Two different types of bowel cleansing products were also assessed and researchers found that low-volume polyethylene glycol (PEG) plus ascorbic acid was as effective as high-volume PEG-electrolyte solution, but has superior palatability (or taste).

This is the first study to demonstrate that the advantage of split-dosage intake is also true for low-volume bowel cleansing solutions. The study appears in the August issue of GIE: Gastrointestinal Endoscopy, the monthly peer-reviewed scientific journal of the American Society for Gastrointestinal Endoscopy (ASGE).

Diagnostic accuracy and therapeutic safety of colonoscopy depend on the quality of colon cleansing (the large intestine is referred to as the colon or large bowel). Inadequate bowel preparation can result in missed lesions, aborted procedures, and increased discomfort as well as a potential increase in complication rates. A standard bowel cleansing product is polyethylene glycol (PEG) taken in a large single dose (four liters), which is required for effective bowel cleansing. When taken in divided doses, a standard four-liter PEG dosage was demonstrated to be as effective as, and better tolerated than, the single dose given one day before the procedure. A new cleansing solution consisting of high molecular weight PEG plus ascorbic acid has been developed which reduces the volume patients have to drink without compromising efficacy or safety.

"The aims of this study were to evaluate the degree of colon cleansing in patients undergoing colonoscopy, comparing split-dosage versus non-split-dosage of two different volumes of PEG solution, low-volume PEG plus ascorbic acid versus standard-volume PEG, and to identify predictors of poor bowel cleansing," said study lead author Riccardo Marmo, MD, Hospital "L. Curto," Polla, Sant' Arsenio, Italy. "We demonstrated that a split-dosage regimen provides the best colon cleansing independent of the volume of PEG and that the optimal timing of colonoscopy is within eight hours of the last fluid intake. The study also found that male patients were at higher risk of poor bowel cleansing and that procedures might be better scheduled late-morning or in the afternoon to allow for split dosing, especially for male patients."

Patients and Methods

This was a single-blind, active control, prospective, randomized study of adult (18 years of age or over) patients undergoing routine elective colonoscopy. A total of 868 randomized patients were analyzed: 435 patients in the spilt-dosage group and 433 in the non-split-dosage group. Two cleansing products were used in the study: PEG 4000 plus electrolytes (standard PEG solution) taken diluted into four liters of plain water (high-volume) and the low-volume solution composed of macrogol 3350 plus electrolytes and 4.700 grams ascorbic acid taken diluted into two liters of plain water. Patients were randomly allocated to receive one of the four different bowel preparation regimens (split-dosage vs. non-split-dosage, low- vs. high-volume). The preparations were dispensed by a nurse endoscopist who carefully explained how they should be taken, emphasizing the importance of complete intake of the solution to ensure a safe and effective procedure. Dietary advice was also given to patients and all patients were instructed to take nothing by mouth from midnight on before the procedure.

Bowel cleansing was assessed by colonoscopists who were unaware of the preparation method. For each anatomical segment of the colon, the degree of bowel cleansing was rated on a segmental scoring scale of one to four (four-excellent, three-good, two-fair and one-poor, see study for a more detailed description of the scale). On the morning of the colonoscopy, immediately before the procedure, a nurse questioned each patient about his or her experience regarding compliance with preparation instructions, tolerance, additional fluid intake, acceptability and willingness to repeat the same type of bowel preparation if necessary. Colonoscopies were performed by experienced colonoscopists unaware of the treatment allocation.

Results

Researchers found that study compliance in both groups was excellent, independent of the intake schedule: complete preparation (drinking the full amount of fluid indicated) was accomplished by 96.3 percent of the low-volume group patients and 95.8 percent of the high-volume group patients in the non-split dosage group, and 97.2 percent and 98.6 percent for both volumes respectively in the split-dosage group.

The split-dosage regimen produced markedly superior cleansing results over the non-split dosage regimen. Overall, a good/excellent degree of bowel cleansing was recorded in 75.2 percent of patients in the split-dosage group versus 43 percent of patients in the non-split-dosage group. The superiority of the split-dosage intake schedule was independent of the volume of PEG solutions. Both low-volume and high-volume PEG solutions produced the same degree of cleansing: 77 percent versus 73.4 percent respectively in the split-dosage group and 41.7 percent versus 44.3 percent, respectively, in the non-split-dosage group. The time elapsed between the last fluid intake and the colonoscopy was an important factor affecting the degree of bowel cleansing. The cleansing score decreased significantly after six to eight hours from the last fluid intake.

Both preparations were well-tolerated; patients reported no side effects. Overall, complete colonoscopy (intubation to the cecum) was achieved in 94.6 percent of cases, confirming a strong association with the degree of bowel cleansing. Incomplete colonoscopy was rare (5.4 percent), but significantly more frequent in patients with fair/poor bowel cleansing. Colorectal polyps were detected in 23.1 percent of patients. The polyp detection rate was significantly higher in patients with bowel cleansing rated as fair/good or good/excellent. A logistic regression analysis showed that independent predictors of poor bowel cleansing were male sex and the non-split-dosage schedule. Researchers concluded that low-volume polyethylene glycol (PEG) plus ascorbic acid was as effective as high-volume PEG-electrolyte solution, but has superior palatability; a split-dosage schedule provides the most effective bowel cleansing; and that colonoscopies should be performed within eight hours of the last fluid intake.

About the American Society for Gastrointestinal Endoscopy

Since its founding in 1941, the American Society for Gastrointestinal Endoscopy (ASGE) has been dedicated to advancing patient care and digestive health by promoting excellence in gastrointestinal endoscopy. ASGE, with more than 11,000 members worldwide, promotes the highest standards for endoscopic training and practice, fosters endoscopic research, recognizes distinguished contributions to endoscopy, and is the foremost resource for endoscopic education. Visit www.asge.org and www.screen4coloncancer.org for more information and to find a qualified doctor in your area.

About Endoscopy

Endoscopy is performed by specially-trained physicians called endoscopists using the most current technology to diagnose and treat diseases of the gastrointestinal tract. Using flexible, thin tubes called endoscopes, endoscopists are able to access the human digestive tract without incisions via natural orifices. Endoscopes are designed with high-intensity lighting and fitted with precision devices that allow viewing and treatment of the gastrointestinal system.

Anne Brownsey | EurekAlert!
Further information:
http://www.asge.org
http://www.screen4coloncancer.org

More articles from Studies and Analyses:

nachricht A sudden drop in outdoor temperature increases the risk of respiratory infections
11.01.2017 | University of Gothenburg

nachricht Urbanization to convert 300,000 km2 of prime croplands
27.12.2016 | Mercator Research Institute on Global Commons and Climate Change (MCC) gGmbH

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

Im Focus: How to inflate a hardened concrete shell with a weight of 80 t

At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).

Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...

Im Focus: Bacterial Pac Man molecule snaps at sugar

Many pathogens use certain sugar compounds from their host to help conceal themselves against the immune system. Scientists at the University of Bonn have now, in cooperation with researchers at the University of York in the United Kingdom, analyzed the dynamics of a bacterial molecule that is involved in this process. They demonstrate that the protein grabs onto the sugar molecule with a Pac Man-like chewing motion and holds it until it can be used. Their results could help design therapeutics that could make the protein poorer at grabbing and holding and hence compromise the pathogen in the host. The study has now been published in “Biophysical Journal”.

The cells of the mouth, nose and intestinal mucosa produce large quantities of a chemical called sialic acid. Many bacteria possess a special transport system...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

Nothing will happen without batteries making it happen!

05.01.2017 | Event News

 
Latest News

Water - as the underlying driver of the Earth’s carbon cycle

17.01.2017 | Earth Sciences

Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

17.01.2017 | Materials Sciences

Smart homes will “LISTEN” to your voice

17.01.2017 | Architecture and Construction

VideoLinks
B2B-VideoLinks
More VideoLinks >>>