5 explanations why a colonoscopy is preferable to ct colonography


Colorectal cancer may be the second-leading reason for cancer-related dying within the U.S. Fortunately, it’s avoidable through proper screening. Inside a September 10 article printed within the Huffington Publish, two radiologists, Dr. Joel Bortz and Dr. Frederick Lebovic, reason that CT colonography, or "virtual" colonoscopy, surpasses traditional colonoscopy for cancer of the colon screening. They contend the only reason colonoscopy is endorsed like a preferred screening method by organizations like the American Cancer Society and also the American College of Gastroenterology is due to the "lucrative" nature from the procedure.

Overview of the medical literature shows why colonoscopy continues to be considered the defacto standard for colorectal cancer screening and why it ought to be suggested for those patients qualified to endure the exam.

Colonoscopy can prevent colorectal cancer

Colonoscopy is among the couple of screening procedures that’s shown to save lives. Inside a landmark study on Memorial Sloan Kettering Cancer Center, colonoscopy with polyp removal was proven to lower mortality from colorectal cancer by 53%. Colonoscopic polypectomy also cuts down on the incidence of colorectal cancer. Because most colon cancers develop from polyps, colonoscopy can prevent the introduction of cancer with the recognition and elimination of lesions that may ultimately turn malignant.

No study within the medical literature demonstrates an identical effect for CT colonography because polyp removal are only able to be accomplished with traditional colonoscopy. Actually, both Centers for Medicare and State medicaid programs Services and also the U.S. Preventative Services Task Pressure figured that there is inadequate evidence to recommend CT colonography for cancer of the colon screening.

One prep, one procedure

The worst a part of colonoscopy or CT colonography may be the bowel preparation. Although progress has been created in creating a laxative-free way of CT colonography, a complete bowel preparation is needed presently for colonoscopy and CT colonography. With the introduction of low-volume, split-dosed preps for colonoscopy, tolerance has improved.

So, what goes on if your polyp is recommended by CT colonography? Based on the radiology literature, a little polyp calculating 6-9 mm in dimensions might be adopted having a repeat CT scan in 3 years. Bigger polyps ought to be removed immediately, which generally requires referral to a different specialist for any second bowel preparation an additional procedure.

If colonoscopy is conducted because the primary screening method, polyps can be taken off in the initial exam having a single bowel preparation.

With proper technique, colonoscopy is really a comfortable and safe test

Colonoscopy is usually performed with sedation, which requires patients to overlook each day from work and could be an origin of complications associated with the process. However, procedural sedation, with either propofol or combination sedatives, is usually well tolerated while offering patients the chance to endure a discomfort-free examination. Additional techniques, for example co2 insufflation and tepid to warm water immersion, happen to be proven to enhance patient tolerance too.

Although CT colonography is touted like a much more comfortable procedure, roughly 7% of patients undergoing the exam experience abdominal discomfort because of air needed to correctly image the bowel. Study results vary regarding patient preferences for screening, only one large multicenter study shown that satisfaction was finest with colonoscopy, including less embarrassment, less discomfort and much more readiness to repeat the process in comparison with CT colonography and barium enema.

Colonoscopy is much better at discovering polyps, small and big

An extensive multicenter study, printed within the Colonial Journal of drugs, shown that CT colonography missed polyps calculating 6-9 mm in 22% of patients, and bigger polyps calculating 10 mm or greater were missed in 10% of patients. Many of these lesions were subsequently detected at colonoscopy. Although miss rates for colonoscopy happen to be printed, using CT colonography like a sole screening technique is worrisome because CT imaging cannot identify flat polyps, which might grow quicker than elevated polyps and therefore are more frequently connected with malignant transformation. Colonoscopy permits both recognition and elimination of these harmful lesions.

Radiation risk isn’t any small matter

While imaging techniques and equipment differ across the nation, each CT scan from the abdomen offers a radiation exposure which is between 7 and eight mSv. This really is believed to lead to roughly 150 installments of radiation-related cancer per 100,000 patients screened by CT colonography every 5 years from 50 years old to 80.

More frequent checking could be needed if small polyps are located. Departing polyps in position is among the most questionable recommendations of individuals who support CT colonography instead of colonoscopy, not just because small polyps can come to be cancer but additionally because serial CT scans would subject otherwise healthy patients to increased perils of radiation-connected injuries more than a lifetime.

Colonoscopy has become a covered health benefit for those Medicare patients and, in many states, for commercially-insured patients. The Affordable Care Act stipulates that coverage for colonoscopy be incorporated in most health plans beginning on or after September 23, 2010.

However, its not all patient is really a candidate for colonoscopy. Patients with severe cardiac or respiratory system disease or advanced age may be at elevated risk for complications from sedation, and patients with physiological abnormalities from the colon might be at greater risk for bowel injuries during colonoscopy. Of these patients, radiologic studies, like barium enema and CT colonography, offer an alternative choice for screening. The current approval of the fecal DNA test supplies a non-invasive alternative for patients who decline or aren’t candidates for colonoscopy.

Of all screening options, colonoscopy continues to be the preferred option for most sufferers due to its superior precision, tolerability, safety, and the opportunity to remove polyps and stop cancer in one procedure. As the debate about colonoscopy versus. CT colonography might continue, colonoscopy will be needed when indications of a precancerous polyp or early cancer of the colon are detected.

Obviously, all decisions about the best screening test to endure ought to be conducted using the guidance of the physician.

Resourse: http://huffingtonpost.com/david-h-balaban-md-facg/

CT Colonography/Virtual Colonoscopy for Colorectal Cancer