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Doctor insights on: Sensitivity Of Optical Colonoscopy

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What are the uses and?Side effects of oct (optical coherence tomography) test of eye?

What are the uses and?Side effects of oct (optical coherence tomography) test of eye?

Versatile: The oct is a magnificent piece of equipment that is capable of many uses. It can be used in glaucoma to measure the size of the angle and to measure the thickness of the layer of tissue around the optic nerve. It is also useful in many different types of retinal disease. There are no side effects to the test itself, in some instances, your eye may have to be dilated to take it. ...Read more

Dr. Charles Cattano
2,047 doctors shared insights

Colonoscopy (Definition)

Colonoscopy is the procedure of using a long flexible camera to visualize the entire colon from the inside with the option to take pictures, video, perform biopsies, remove polyps, etc. Generally people are sedated and do ...Read more


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Describe near infrared raman spectroscopy for optical diagnosis of cancer?

Describe near infrared raman spectroscopy for optical diagnosis of cancer?

Laser Diagnosis: Raman spectroscopy can be used in the non-invasive diagnosis of skin cancers, with a high degree of accuracy. The technology is complicated, but it is used to detect the shift in light transmission when a superficial laser beam passed over a lesion in the skin encounters molecules from a dense cluster of cells with a high dna content, as would be present in a skin cancer. ...Read more

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Can CT scan clearly pin point the location of colon perforation and determine the size of the hole, using color contrast drink?

Can CT scan clearly pin point the location of colon perforation and determine the size of the hole, using color contrast drink?

Sometimes : If the perforation is large enough, and the oral contrast is in that loop of bowel, then yes. A very small hole may not be seen that way, but the ct will show air that has leaked out of the bowel, which can help the surgeons if an open repair is required. ...Read more

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What are the tests for detecting early onset glaucoma?Does retinal examination help?Iot:18 both eyes.Feel contrast loss at night.Doc said lent opacity

What are the tests for detecting early onset glaucoma?Does retinal examination help?Iot:18 both eyes.Feel contrast loss at night.Doc said lent opacity

Testing: Glaucoma is not the most common cause of loss of contrast at night. Visual field or oct testing can be done to detect early glaucoma, but with normal pressures such as yours and a normal exam, i would not expect them to show glaucoma. Those tests are usually done in patients that show physical signs of possible glaucoma such as elevated pressures or cupping of the optic nerve. ...Read more

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Fibre length, overall signal attenuation for an optical link, coupling loss exam, what are these?

Fibre length, overall signal attenuation for an optical link, coupling loss exam, what are these?

Non-medical: These are terms out of fiber optic technology relating to the signal loss related to length of the fiber, loss jumping the gap between two fibers juxtaposed and loss from characteristics of the optical fiber. ...Read more

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What is the risk of bowel perforation from CT colonography "virtual colonoscopy"??

What is the risk of bowel perforation from CT colonography "virtual colonoscopy"??

Not invasive.: A traditional colonoscopy is invasive; the fiber optic camera is passed through the colon, and therein causes the low risk of perforation of the colon. A CT colonography is not invasive; it's just a fancier CT scan, so there's nothing to directly cause a perforation. ...Read more

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Is it possible to get accurate visual field test with macular pucker decline in visual acuity, lights less bright & white computer screen looking gray?

Is it possible to get accurate visual field test with macular pucker decline in visual acuity, lights less bright & white computer screen looking gray?

Usually it is fine: You have defects in the central visual portion of your field of view - an area poorly outlined by most field testing devices. Field tests will define major defects which largely will register from the peripheral areas tested. Have you had a field tested in the past? Is there some condition being sought for with a field.? Your ophthalmologist would not order a field if he doubts the result. ...Read more

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Are there errors, distortions, or disadvantages of using a mirror in a visual acuity test?

Are there errors, distortions, or disadvantages of using a mirror in a visual acuity test?

No: No, the image is the same as if you were looking the entire 20 feet (or 6 meters). The virtual image produced by the mirror is 20 feet away. Now, if the mirror is very dirty or dusty, maybe. ...Read more

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Normal field vision test. Dilated optic discs small w/slight asymmetry. Suspicious oct scan. Eye pressure 27. Family history. Suspect for glaucoma?

Normal field vision test. Dilated optic discs small w/slight asymmetry. Suspicious oct scan. Eye pressure 27. Family history. Suspect for glaucoma?

Yes: It is important that your eye pressure be monitored closely and that the visual fields and oct are tested are a regular basis. I suggest you see an ophthalmologist regularly. There are usually no symptoms of glaucoma that you will experience. ...Read more

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Does the eye surgery to take out floaters involve side effects of light sensitivity and vision distortion?

Does the eye surgery to take out floaters involve side effects of light sensitivity and vision distortion?

Surgery?: Floaters are not generally treated with surgery unless associated with retinal detachment or surface wrinkling retinopathy. Laser has been used to break up annoying large floaters leaving annoying small floaters instead. As floaters are usually not harmful, and time usually results in dissipation and less annoyance, they are mostly left alone. Vitreous surgery can cause distortion and discomfort. ...Read more

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YAG iridotomy at 12 o'clock position. Have ghost images in lower field of vision. Looks kind of like a line/crescent of light Will these resolve?

YAG  iridotomy at 12 o'clock position.  Have ghost images in lower field of vision.  Looks kind of like a line/crescent of light Will these resolve?

Most often yes: Sometimes no, if it does not, please look into a corneal tattoo (rarely needed but works very well to block the extra light coming through or colored contact lens. ...Read more

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I have a refractive error of -5.75 in both eyes (myopia & astigmatism) and floaters in both eyes. Is a pupil dilation better than the digital retinal?

I have a refractive error of -5.75 in both eyes (myopia & astigmatism) and floaters in both eyes. Is a pupil dilation better than the digital retinal?

Yes: Nothing beats the chance to get a good look at the peripheral retina when there is an onset of new floaters. Dilation is a bit of an annoying pain but is recommended in this circumstance. You are, hopefully, seeing an ophthalmologist. ...Read more

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Uc flare with thin stools, chunks of blood in stool, and frequency. Egd, colonoscopy, biopsies & digital perianal & rectal exam all normal. confused?

Uc flare with thin stools, chunks of blood in stool, and frequency. Egd, colonoscopy, biopsies & digital perianal & rectal exam all normal. confused?

UC is long-term: Ulcerative colitis is a lifelong inflammatory disease of the lining of the large intestine and rectum, that may have systemic consequences, is often relapsing, and can lead to colon cancer. Flares may occur acutely, even after an unremarkable colon evaluation. Don't delay in ruling out superimposed infection, & seeking help from your gastroenterologist. Call him/her now-- ...Read more

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What are the differences between sigmoidoscopy prep and colonoscopy prep?

What are the differences between sigmoidoscopy prep and colonoscopy prep?

It is similar: Both procedures require complete cleaning up of the Colorectal area. So the prep is not any different. ...Read more

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Can CT with rectal and IV contrast rule out small polyps or lessions in the colon?proctoscope and rectal exam are clean.no blood in stool.

Can CT with rectal and IV contrast rule out small polyps or lessions in the colon?proctoscope and rectal exam are clean.no blood in stool.

Small polyps: would be very difficult to diagnose on such an exam. A tailored "CT Colonography" would be better. Standard colonoscopy would be best. ...Read more

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Can stool in the colon cause a pet scan to light up?

Can stool in the colon cause a pet scan to light up?

No: There is variable uptake throughout the bowel on pet scans due to a number of factors (e.g., bowel motility, types of cells in the bowel or inflammation). It is not uncommon to have areas of focal uptake in the bowel. Stool, per se, should not cause increased uptake, though bowel activity may lead to a focal "hot spot.". ...Read more

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Eye sight degraded,MR venography shows narrowing to full occlusion of transverse and sigmoid sinuses,feeling headache in left back of head?

Eye sight degraded,MR venography shows narrowing to full occlusion of transverse and sigmoid sinuses,feeling headache in left back of head?

To the ER: I assume if you had MR venography that shows narrowing to full occlusion you have already saught care. this can be related to a cavernous sinus thrombosis which is severe vision threatening condition. please make sure you follow all the guidelines set out by your physicians. Good luck ...Read more

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I want to have total anesthesia during my colonoscopy due to my my high sensitivity to pain. Do you think my doctor can refuse ?

I want to have total anesthesia during my colonoscopy due to my my high sensitivity to pain.  Do you think my doctor can refuse ?

The newer: anesthetic agents are short acting and most gastroenterologists are now using such ("general") anesthesia making colonoscopy a PAINLESS EVENT!

SO..NOT TO WORRY!
BE WELL
Hope this is helpful!
Dr Z ...Read more

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Colonoscopy diag diverticulosis biopsy fine. Still having abdo pain&tenderness could it be from previous diverticulitis attack that hasn't settled?

Colonoscopy diag diverticulosis biopsy fine. Still having abdo pain&tenderness could it be from previous diverticulitis attack that hasn't settled?

Depends: Pain from acute diverticulitis attack can last several weeks. Adhesions (scar tissue) from previous attacks can also cause pain in some patients. Minority of patients can have tenderness even without acute diverticulitis. If pain is new/different, need to call ur pcp. If fever/chills as well, this could be an emergency. ...Read more

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Alternating constipation and diarriah flat stool , upper abdom tenderness. No gb. Upper gi, ct, bloodwork normal. Waiting colonoscopy. I am in agony !

Alternating constipation and diarriah flat stool , upper abdom tenderness. No gb. Upper gi, ct, bloodwork normal. Waiting colonoscopy. I am in agony !

Need the colonoscopy: With those symptoms, a colonoscopy is needed as soon as possible to be sure there is not a a partially obstructing polyp or other lesion. It could be something as simple as constipation from inadequate fiber in the diet. ...Read more

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3 months left side abdo & flank pain and tenderness blood urine cystoscopy & CT scan fine. No diarrhea, but some constipation. Colonoscopy next. Cause?

3 months left side abdo & flank pain and tenderness blood urine cystoscopy & CT scan fine. No diarrhea, but some constipation. Colonoscopy next. Cause?

Possibilities: A ct scan could have missed a kidney stone that passed just before the scan. It could also miss diverticulitis, depending on whether the ct scan was done with both IV and oral contrast. Colonoscopy is definitely the next thing to do. Another consideration is endometriosis, ovarian cyst, ectopic pregnancy, or inflammatory bowel disease. ...Read more

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What are the risks of a colonoscopy for someone in their 80's?

Perforation: The two main risks of colonoscopy are perforation and missed lesions. The national rate of perforation is 1 in every 3, 000 to 5, 000 colonoscopies. This is a very low rate, so much so that it is considered very low risk. The rate of missed lesions is estimated to be about 15 for every 100 lesions, nationally. The risk of sedation depends on your health status, but it is generally very safe. ...Read more

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Can i go to a party after my colonoscopy? My procedure’s on friday morning and i want to go to a party that night. Is it safe for me to go? Can i drink?

Can i go to a party after my colonoscopy? My procedure’s on friday morning and i want to go to a party that night. Is it safe for me to go? Can i drink?

Thanks : Thanks for your question. Generally we advise patients not to drive or operate any heavy machinery until the following day after a colonoscopy, because the medicines used to sedate you can cause cloudy thinking and altered judgment. There is no medical reason you couldn't go to a party if you are feeling up to it, but i would strongly suggest you go with a trusted friend who can drive you and stay with that friend for the duration of the party. Let him/her know that your judgment may be impaired so he/she can "look out" for you. I would suggest not drinking alcohol that night. I hope this answers your question. Good luck! ...Read more

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Colonoscopy during a colonoscopy, is it necessarily to be fully or asleep or do the patient have the choice? Edit: (grammar mistake) during a colonoscopy, is it necessarily to be fully asleep or do the patient(s) have a choice?

You : You can discuss with your doctors and anesthesiologist your choices. In the past, only mild sedatives were used for colonoscopy, but in the past several years more anesthetics have been used. It may depend on if you have any other medical conditions that could affect your risks. ...Read more

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What is a colonoscopy?

What is a colonoscopy?

Look inside colon: You are sedated (very sleepy, but still breathing on your own). The endoscopist places an instrument through your anus and then passes it into the colon to carefully exam the colon for polyps, cancer, etc. If any abnormalities are found a biopsy may be done. Typically, it is painless - the only bother is cleaning out your bowels beforehand and even that's not so bad. ...Read more

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Do colonoscopies hurt?

No: Colonoscopy is usually performed with some form of sedation and if done correctly you should not feel anything or remember anything. ...Read more

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What is a colonoscopy like?

A simple test: After appropriate colon preparation at home, arrive at the endoscopy center, change into a gown & IV is inserted. Once in the procedure room, final consent is obtained, IV sedation is given (there are options here--some patients choose no sedation, others want to be "out cold"), & a thin flexible tube with video camera is inserted per rectum & advanced, taking pictures, biopsies, & therapeutics. ...Read more

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How to prep for a colonoscopy?

Lots of options: There are a lot of different regimens for doing a colonoscopy prep. It depends on your gastroenterologist what they prefer. Ultimate what they want is a clean prep, so you should not have any stool in your colon when they look. You will have a sense of whether your prep is complete when you look in the toilet bowl and you shouldn't see any solid material left. ...Read more

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What results from colonoscopy?

Colonoscopy: This is a good screening tool used for the appropriate age group in screening for colon cancer. ...Read more

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Do I really need a colonoscopy?

Do I really need a colonoscopy?

Age: When either 45 or 50 yrs old or of bleeding or other symptoms also pending family history. ...Read more

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Colonoscopy: what can I expect?

Not bad: The most annoying part is the bowel cleanout the day before. You have to drink a fluid that makes you have enough bowel movements until your stool becomes clear. The colonoscopy procedure itself is usually easy. When you go home you will have some abdominal discomfort and bloating. Sometimes you can have a little rectal bleeding as well. ...Read more

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What may appear in a colonoscopy?

Pretty much anything: Colonoscopies are mostly done for screening, looking for polyps which may be pre-cancerous, thus removing them in essence prevents a cancer. Colonoscopies are also done to evaluate for other problems, like diverticulosis, hemorrhoid bleeding, changes in bowels which may be from comparatively benign conditions, but infectious diseases, inflammatory diseases and other colon problems may be found too. ...Read more

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When should I start colonoscopies?

When should I start colonoscopies?

50 unless...: The general guideline is age 50, but there are exceptions to that rule. For example, family history of colon cancer can move up the schedule. ...Read more

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How can you die from a colonoscopy?

How can you die from a colonoscopy?

Unlikely: Dying during a colonoscopy or because of one is a very rare event. The risk of a perforation or hole during a colonoscopy is about 1/1500. The risks of dying would increase if one had a perforation that was not noticed. Also there is a risk of having complications from the sedation. One could stop breathing from over sedation which could lead to death, again, a rare event. ...Read more

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No pain, why would i need a colonoscopy?

No pain, why would i need a colonoscopy?

Screening: screening for colon cancer. cancer usually does not give symptoms until it is a large tumor that has spread to other organs. At that point you would start having symptoms, but survival after treatment would be significantly reduced. ...Read more

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