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Showing posts with label DNA fragmentation. Show all posts
Showing posts with label DNA fragmentation. Show all posts

Sperm DNA fragmentation assessment: Is it really helpful?

Posted by nurul Thursday, March 17, 2011 0 comments
All infertile couples know that the sperm plays a vitally important role in fertility. However, there's still a lot of confusion ! If we need only one sperm to fertilise an egg during ICSI, does the sperm count and motility really matter ? And if it does, how and why ?

The fact that the WHO has kept on changing the definition of what a normal sperm count just testifies to the fact that experts are as confused as patients are. This is especially true when we consider 3 contentious areas. While it's true that the sperm provides 50% of the child's DNA, can it be responsible for:
failed fertilisation after ICSI ?
poor qualty embryos ?
miscarriages ?

In order to drill down further into when the sperm can be responsible for reproductive problems, researchers have developed sophisticated tests to analyse whether the sperm are "normal " or not. In the past, the only tests we had available were the sperm count, motility and morphology. These are admittedly crude tests, and the hope was that newer tests which could directly check the functional status of the sperm's DNA would give us more useful information. Logically, since the man's DNA contributes half of the offspring’s genetic material , it is reasonable to assume that abnormal DNA in the form of fragmented DNA ( when excessive strand breaks are present ) may lead to derangements in the reproductive process.

Let's look at some of these tests.

The tests used for the assessment of sperm DNA integrity can be distinguished into direct and indirect. Direct assays try to detect the actual DNA breaks, while indirect assays quantify the susceptibility of sperm DNA to break after an external insult, such as acid treatment. The most commonly used direct assays are; Terminal Deoxynucleotidyl Transferase-mediated Nick End Labeling (TUNEL), Single Cell Gel Electrophoresis (COMET) and In-Situ Nick Translation (NT) assay. The most common indirect assays are; Flow flow cytometric acridine orange assay, Acridine Orange test (AO), DNA Break Detection-Fluorescence In Situ Hybridization (DBD-FISH) and Sperm Chromatin Dispertion test (SCD).

The very fact that it's such a long list is a testimony to the fact that we really do not understand what the results signify in real life. For example, breaks affecting genes in “silent” areas of the genome are unlikely to have any clinical importance, but no assay can evaluate this factor yet.

The truth is that for the present, there is no differentiation between clinically significant and insignificant fragmentation. While it's true that many studies using a variety of assays have shown statistically significant differences in sperm DNA fragmentation between fertile and infertile men, remember that these refer only to the mean or median . In reality, there is extensive overlap between the values found in fertile and infertile men.

Because these tests are so new, they've not been standardised. Clear reference values have still not been established, just adding to the confusion. Just like conventional semen parameters have been proven to be disappointing at predicting the outcome of IVF, sperm DNA fragmentation has been equally disappointing in predicting pregnancy rates after standard IVF and ICSI.

If you have poor quality embryos and your test shows you have increased sperm DNA fragmentation , it's very tempting to conclude that it's the sperm DNA fragmentation which is responsible for the fragmented embryos. However, this has never been proven ; and please remember this is not necessarily cause and effect. Men with higher sperm DNA fragmentation have had completely healthy and normal babies in their bedroom !

DNA fragmentation is a new parameter for the evaluation of male factor infertility . However, just because it is new does not automatically mean it is better ! In fact, at present it just seems to add to the confusion, rather than clarify it !
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How your doctor can reduce your fertility - a guide from Dr Malpani

Posted by nurul Wednesday, January 12, 2011 0 comments

Infertile patients expect that their doctors will provide them with treatment to improve their chances of having a baby. Tragically, some medical procedures can actually end up reducing your fertility !

Here's a list of the top ten procedures which can actually harm you, rather than help you ! If your doctor advises any of these, please get a second opinion before agreeing !

1. D&C ( dilatation and curettage) . This is a "minor" surgical procedure in which the doctor dilates the mouth of the uterus ( the cervix) and scrapes the uterine lining using a curette
( curettage). This endometrial tissue is then sent for pathological examination. In the past, when doctors had very little to offer to their patients, this used to be the mainstay of the treatment of an infertile couple. In fact, even today, some women will ask the doctor to do a D&C for them because their mother conceived after doing this procedure ! They feel that it helps to "clean the uterus", thus improving their fertility ! While it is true that some women will get pregnant after a D&C ( sometimes this is just a placebo effect; while sometimes the endometrial inflammation induced by the procedure can improve uterine blood flow and fertility), this is an obsolete procedure which should be used in this day and age only for confirming the diagnosis of endometrial tuberculosis.

2. Metroplasty. This has become quite a fashionable procedure in some parts of India, where the doctor "improves" the shape of the uterine cavity to improve fertility. It can actually create uterine scarring and induce fertility. It's only in India that doctors use this technique for "treating" infertility. In all other countries, it is reserved for correcting uterine anomalies or removing intrauterine adhesions.

3. Hydrotubation. This is a procedure in which the doctor flushed the uterus and the tubes with fluid ( which often contains a concoction of chemicals such as steroids and antibiotics) to treat infertility. While it can help some women with cornual blocks, for the vast majority this painful treatment ( which is often repeated many times in one month) is a waste of time and money.

4. Empiric treatment for abnormal sperm . This continues to remain a major time-waster for infertile couples. Tragically, most doctors are still unaware of the recently revised criteria of what a normal sperm count is - and will often reflexively treat men with what they think is an "abnormal sperm report". There are various levels of sophistication to this futile effort. To cloak this with an aura of scientific respectability, high tech labs will now test sperm for DNA fragmentation levels - and doctors are quite happy to "fix" the problems these tests will often pick up. What many patients do not realise that there is very little correlation between these test results and their fertility potential - and that even fertile men have high DNA fragmentation levels ( but are fortunately unaware of this, as they have enough sense not to get their sperm tested in a lab !)

5. Treatment for genital tuberculosis. We are now seeing an "epidemic" of uterine TB in India - especially in north India, where it appears that practically even woman who goes to a gynecologist has TB ! Doctor use dodgy tests called PCR to test the endometrium for the presence of DNA fragments which are supposed to be be specific markers for the tubercle bacilli - without even bothering to determine what the prevalence of this TB PCR positivity is in the fertile population ! Not only do these poor patients end up taking 6 months of toxic and expensive drugs; their husbands will often stop having sex with them ( because they are worried that they will transmit the TB to them); while others are scared that they will give the TB in their uterus to their baby !

6. Treatment for TORCH infections. Women who have been unfortunate enough to have a miscarriage will get routinely ( and mindlessly) tested for the presence of antibodies against the TORCH group of infections. If any of these tests is positive, the doctor then promptly treats this infection with antibiotics ( which are completely useless and uncalled for !). The truth is that pregnancy. You can read about this at www.drmalpani.com/torch.htm

7. IUI ( Intrauterine insemination ) for treating couples men with a low sperm count. Since everyone knows that " you need just one sperm to fertilise an egg", it seems to make a lot of sense to treat infertile couples who have a low sperm count with IUI . After all, IUI is a simple and inexpensive treatment, which every gynecologist can offer - and patients understand the logic as to why it should help. The truth is that the problem with men with low sperm counts is not just that their sperm count is low - its often that the sperm are functionally incompetent - and no amount of concentrating the good sperm or washing them is going to help !

8. Diagnostic laparoscopy. Once upon a time, a laparoscopy was a major advance in evaluating the infertile woman, because it actually allowed the doctor to visualise the ovaries and fallopian tubes without having to cut open the patient ! Minimally invasive surgery was a major advance then , but now it's being overused. Many doctors still routinely perform a laparoscopy for all infertile women, which is completely unnecessary surgery, as is does not change the therapeutic options for these patients. The status of the fallopian tubes can as easily be checked with a simple HSG, which is much less expensive ! It's true that a laparoscopy allows the doctor to also "find" adhesions and endometriosis, but making the diagnosis of this ( or "treating" them ) does not really improve the patient's fertility at all !

9. Medications for treating endometriosis. Endometriosis is an enigmatic and frustrating disease; and mot doctors will still reflexively "treat " this with medications, such as GnRH analogs. While these medications are great at suppressing the endometriosis (and will provide dramatic pain relief), this suppression is only temporary - and does not improve the patient's fertility at all (since they also suppress ovulation at the same time !) Once the meds are stopped, the endo recurs ! Even worse, "treating" the endo with meds just wastes the patient's time - something which most infertile patients cannot really afford to fritter away !

10. Operative laparoscopy for myomectomy and cystectomy. One problem with today's high tech diagnostic tools ( such as vaginal ultrasound scans) is that it allows the doctor to "diagnose" small 1 cm size ovarian cysts and fibroids. Now while cysts and fibroids are very common in fertile women as well; and small cysts and fibroids do not affect fertility, once the sonographer has "reported" his "diagnosis", the patient often panics ! The doctor is happy to point out these abnormalities - and convinces the patients that it is these abnormalities which are the cause of her infertility - and that once these are "treated", she'll get a baby quickly ! What's worse is that it's easy to do the surgery with a laparoscopy ( which is just "minor surgery"), that patients are quite happy to sign on the dotted line without realising that these are incidental findings of no clinical importance; and that the surgery will not help them. What's worse, is that this unnecessary surgery can reduce your fertility as normal ovarian tissue is also removed along with the cyst wall, thus reducing your ovarian reserve.

I sometimes think we are seeing an epidemic of overtesting and overtreatment. Doctors seem to like doing tests - and patients like being tested ! Unfortunately, patients are still not sophisticated enough to differentiate between useful tests and useless tests - and the truth is that some tests can actually be harmful !

The hidden danger with a lot of these unnecessary testing is that patients get fed up; lose confidence in doctors; and refuse to pursue more effective treatment options, because they do not trust doctors any more !

The message is simple - if you have a medical problem, remember that Information Therapy is invaluable ! Please get a second opinion if you are unsure and confused. Send me your medical details by filling in the free second opinion form at www.drmalpani.com/malpaniform.htm and I'll be happy to help !



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The quality of a doctor's answers depend upon the quality of a patient's questions

Posted by nurul Thursday, December 23, 2010 0 comments
Recently I witnessed an infertile couple who had over three heavy files bulging along with medical tests and reviews. They may have visited more than ten infertility experts who tried every single possible examination under the sun to attempt to discover what their issue was. The lady had been examined for antisperm antibodies, NK cells , hostile cervical mucus, tuberculosis, chlamydia, sperm DNA fragmentation… you name it, and she had had the examination done. Every single gynaecologist had repeated test after test, however every result had been normal. They were at their wit’s end. “Why can’t I get pregnant , doctor , if things are all normal ?” was her plaintive cry.

I was surprised about how little she had learned after going to numerous doctors. Rather than understanding from her experience, she was still asking the wrong question ! She expected me to order extra medical tests, or utilize some modern device in order to probe her insides and pinpoint the elusive issue.

I needed to advise her that the quality of the response we get is determined by the standard of the actual question we ask. Nobody cares about issues - folks just worry about solutions. Rather than continue asking “What’s the issue ? Why aren’t I getting pregnant ?”, she need to preferably be asking , “What can I do in order to get pregnant ?”

Ask a better question , therefore you get a far better answer ! It was an entirely new perspective for her, and I had to walk her through this viewpoint. As I told her, it barely mattered what are the reasons for her inability to conceive had been - the only thing which mattered was how all of us can fix the problem.

Everybody knows: GIGO - garbage in, garbage out. In case you continue asking “What’s the problem ?” you will end up throwing away a lot of time, money and energy in trying to discover it. Sadly, several of these diagnostic labels are incorrect, unreliable or simply completely wrong. For instance, a couple of years ago, numerous patients had been identified as having an “inadequate luteal phase” - and perhaps treated for this issue ! We now realize, with hindsight, that there's absolutely no such situation, and we did a significant disservice to our patients by coining this term and doing such a (mis)diagnosis.

This breaks my heart when I notice how much time and money infertile folks have lost in seeking a diagnosis. Is it the endo , doc ? Could I be possessing antisperm antibodies ? These are all the completely wrong concerns, but we see this all the time.

Hence, after a unsuccessful IVF cycle , the first question patients ask is - Why didn’t I get pregnant ? (Interestingly, patients who conceive after IVF (In Vitro Fertilization) never ask - Why did I get pregnant? The truth is that we can't answer either of these questions - and quite often it’s only a matter of chance!

The correct question patients should be asking after a unsuccessful IVF cycle is - What can I do next? Usually, the best solution would be to repeat the IVF (In Vitro Fertilization) cycle. It’s a lot like purchasing a lottery ticket - there’s absolutely no compulsion to do so, but if you don’t buy, you don’t win! And the oftener you purchase, the greater your chances of winning!

That's why, for many infertile patients, it’s better to look ahead instead of to look backwards. The best question is - What’s the next thing? Its best if you make a list of all feasible treatment alternatives - ranging from: stopping treatment and remaining child-free; adopting; repeating the IVF cycle; doing the IVF cycle at a new medical center; or utilizing third party reproduction. After that you can eliminate the alternatives that you will not consider, so that you are then left with the alternatives you are ready to explore. After this you ought to concentrate on each one of these, until you discover one which is best for you.

Usually, if you are using this technique, you might find that the absence of alternatives makes decision making easy , and you can prepare your next step and navigate your path through the infertility maze with much less effort !

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