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Complications of hysteroscopy

INTRODUCTION. Complications may occur in diagnostic or operative hysteroscopy. The complication rate in diagnostic hysteroscopy is low and was estimated by Lindemann (1989) to be 0.012% . Complications from operative hysteroscopy are more common and potentially more serious. . Complications may result from (Taylor

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Complications of hysteroscopy

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    1. Complications of hysteroscopy

    2. INTRODUCTION Complications may occur in diagnostic or operative hysteroscopy. The complication rate in diagnostic hysteroscopy is low and was estimated by Lindemann (1989) to be 0.012% . Complications from operative hysteroscopy are more common and potentially more serious.

    3. Complications may result from (Taylor & Gordon, 1994): Anesthesia Positioning the patient The distension media The surgery: Uterine perforation Haemorrhage Delayed complications: Infection Adhesion formation Failure of resolution of the presenting symptoms

    4. THE ANAESTHETIC The risks to the patient from the anesthetic are similar to those from any other operation. The complications which are specific to hysteroscopic surgery are those which may present as shock resulting from: Uterine perforation or Injury to a major vessel or from Fluid overload.

    5. The anesthetist may be the first to recognize the onset of danger and may recommend that the surgeon discontinue the procedure and to institute appropriate treatment. THE ANAESTHETIC

    6. POSITIONING THE PATIENT Incorrect positioning of the patient may result in: Nerve injuries Back injuries Damage to soft tissues Deep venous thrombosis (DVT)

    7. 1. Nerve Injuries The degree of Trelendenberg tilt required for hysteroscopic surgery is less than that for operative laparoscopy. Brachial plexus injury may result from incorrectly placed shoulder restraints or from leaving the patient's arm abducted on an arm board. A non-slip mattress is preferable to restraints that compress the patient's shoulders. Injury can result from 15 minutes in a faulty position.

    8. Pressure on the peroneal nerve by lithotomy stirrups may result in paraesthesia and foot drop. If lithotomy poles are used, the legs are adequately padded. Supports which hold the leg in a padded gutter are preferable. If injury occur, the advice of a neurologist should be sought immediately. 1. Nerve Injuries

    9. 2. Back injuries. The anaesthetized patient is defenseless against traction injury to the lumbar spine. The legs should be lifted simultaneously and kept together until they are at the appropriate height when they should be abducted gently and placed in the supports. They should never be over-abducted as this can lead to damage to the sacro-iliac joints.

    10. 3. Damage to soft tissues. It is the responsibility of the surgeon to ensure that there is no injury from moving parts of the table to the patient's soft tissues or hands. No part of the patient is in contact with metal parts of the table because these can act as return plates for electrical energy and burns can occur at the point of contact.

    11. 4. Deep venous thrombosis. Can result from prolonged compression of the calves by the leg supports. The surgeon should ensure that the type of support is appropriate and well padded. If DVT is suspected the appropriate anticoagulant therapy is instituted.

    12. THE DISTENSION MEDIA Complications produced by the distension media are specific to hysteroscopic surgery. It is essential that all the operating room staff should know the side effects of the distension media.

    13. The nature of the complications depend on the type of medium in use. The medium may be carbon dioxide (CO2) in the case diagnostic hysteroscopy or fluid in both diagnostic and operative procedures. The fluid may be of high or low molecular weight. THE DISTENSION MEDIA

    14. If excessive amounts of distension media are absorbed the following complications may occur:

    15. 1. Carbon dioxide. Cardiac arrhythmia may occur with diagnostic hysteroscopy. The complication should be extremely rare if the correct insufflator is used. The hysteroflator delivers CO2 at a rate of not more than 100ml per minute whereas the laparoflator can deliver 1-6 litres in the same time.

    16. A laparoflater should NEVER be used for hysteroscopy. It is rare for C2 to produce any side effects if gas embolism of less than 400ml occurs. 1. Carbon dioxide.

    17. Dextran is popular in some countries for both diagnostic and operative hysteroscopy when mechanical instruments are used. It may produce an: Anaphylactic reaction, Adult onset respiratory distress syndrome (ARDS) or Pulmonary oedema.

    18. Anaphylaxis should be treated by the administration of : Oxygen, Antihistamines, Glucocorticoids and Intravenous fluids.

    19. Adult onset RDS requires the administration of : Glucocorticoids, Oxygen and, occasionally, Assisted respiration. 2. High molecular weight fluids: Dextran

    20. 3. Low molecular weight fluids. Saline may be used with the laser But only non-electrolytic fluids should be used with electrosurgery because of the risk of producing burns to other organs. All low molecular weight fluids may produce fluid overload.

    21. Accountancy of fluid input and output is mandatory in any hysteroscopic procedure. The severity and management of fluid overload depends on the nature of the medium in use. 3. Low molecular weight fluids

    22. Produces a: simple hypervolaemic state which may be treated by: Insertion of a central venous line, Administration of a diuretic, oxygen and, if necessary, cardiac stimulants. Saline overload

    23. A blood pressure cuff may be applied to each limb to occlude venous return which, in effect, performs a bloodless phlebotomy. Saline overload

    24. Overload with sorbitol May produce hypoglycaemia in the diabetic patient, haemolysis or signs of hyper-volaemia. Hypoglycaemia should be treated with administration of glucose, measurement of blood sugar levels and restoration of euglycaemia.

    25. Overload with glycine May produce : Nausea and vertigo, Hyponatraemia, Transient hypertension followed by hypotension associated with confusion and disorientation. Excessive overload may produce elevated blood ammonium levels leading to encephalopathy and, rarely, death.

    26. Hyponatraemia should be treated with administration of diuretics and hypertonic saline solution combined with monitoring of serum electrolyte levels until normality has been restored. Encephalopathy requires haemodialysis to be performed. Overload with glycine

    27. Fluid Overload Usually occur in the immediate post-operative period. The surgeon and/or anesthetist have the responsibility to begin resuscitative procedures and seek appropriate advice and help from their colleagues in internal medicine. If such complications should occur during the procedure, surgery must be abandoned.

    28. Prevention of Fluid Overload May be accomplished by: Using appropriate distension media and delivery systems Keeping operating times to a minimum Avoiding entering the vascular channels Keeping fluid pressures below 80mmHg and gas pressures below 100mmHg. Meticulous accountancy of fluid balance. The procedure must be abandoned if the deficit rises to 2 litres or there is evidence of venous congestion..

    29. THE SURGERY Complications of surgery may arise during the operation or be delayed. Intra-operative complications include: uterine perforation and haemorrhage. Delayed complications include: infection, discharge and adhesion formation.

    30. 1. Uterine Perforation The incidence of perforation is about 0.8% (Hill et al, 1992). In the British Mistletoe study perforation occurred in 0.64% and 0.65% of cases respectively with roller ball and laser but in 1.29% and 2.47% of cases when roller ball and loop or loop alone were used (Maresh 1996).

    31. The uterus may be perforated by: A dilator, The hysteroscope or A surgical instrument. 1. Uterine Perforation

    32. The management will depend on the: Size, method and site of the perforation, Whether there is risk of injury to another organ and Whether or not concomitant observation with a laparoscope was being performed. 1. Uterine Perforation

    33. Simple perforation may be made with a cervical dilator or with the hysteroscope. Perforation should be suspected if the dilator passes to a depth greater than the length of the uterine cavity. Perforation with the hysteroscope should be avoided by always introducing the telescope under direct visual control. 1. Uterine Perforation Simple perforation

    34. Simple perforation rarely causes any further damage and may be treated conservatively by observation and appropriate broad spectrum antibiotics. Laparoscopy may be considered to exclude bleeding.

    35. Complex perforation may be made with : Mechanical, Electrical or Laser instruments 1. Uterine Perforation Complex perforation

    36. It is unusual for perforation with scissors to cause injury to other organs although this may occur when dividing adhesions in cases of extensive Asherman's syndrome. Hysteroscopy in these cases should always be accompanied by laparoscopy to recognize impending or occult perforation. 1. Uterine Perforation Complex perforation

    37. Complex perforation caused by electrosurgical instruments or laser may be associated with thermal injury to adjacent structures including bowel or large vessels.

    38. Laser may produce thermal injury at a distance from the site of the perforation because, once the myometrium has been breached, it will vaporize the next surface in its path. Displacement of bowel from the pelvis does not protect it from laser burns. 1. Uterine Perforation Laser

    39. If perforation is suspected: The energy source should be switched off and The hysteroscope left in situ unless Laparoscopic monitoring has been in progress in which case the telescope can be withdrawn.

    40. If the perforation has been caused by an electrosurgical instrument and concomitant monitoring has been performed, laparoscopic examination to exclude bowel injury may be all that is necessary. 1. Uterine Perforation

    41. In the majority of cases of electrical injury, and in all cases where laser has been used : Laparotomy and Detailed examination of the bowel, pelvic blood vessels and aorta is mandatory. 1. Uterine Perforation

    42. 2. Haemorrhage The prevalence of haemorrhage depends on the form of energy used for ablation. With loop and roller ball or loop alone the incidence is 2.57% and 3.53% respectively whereas with laser or roller ball it is 1.17% and 0.97% (Maresh 1996).

    43. Intrauterine bleeding occurring during the procedure should be immediately obvious and can usually be controlled by spot electrocoagulation. 2. Haemorrhage

    44. If coagulation fails to control the bleeding, the procedure may have to be abandoned and tamponade performed by inserting a Foley catheter and distending the balloon. The catheter should be left in situ for a few hours after which the bleeding nearly always stops. 2. Haemorrhage

    45. Occasionally these simple measures fail to control haemorrhage. This may occur if resection has been carried out too deep into the myometrium and a plexus of vessels opened. In this case: Hysterectomy, Ligation or Ultrasound guided embolization of the anterior branches of the internal iliac arteries may be necessary. 2. Haemorrhage

    46. Less significant bleeding may be caused by tearing of the cervix with the tenaculum or uterine perforation. Lateral tears of the cervix may produce : Significant bleeding and may also Lead to excessive absorption of the distention medium. 2. Haemorrhage

    47. LATE ONSET COMPLICATIONS 1. Infection Acute pelvic inflammatory disease is rare following hysteroscopic surgery. This may be prevented by prophylactic antibiotics. The diagnosis is made by the presentation of the classic symptoms and signs and Treatment should be by appropriate antibiotics following culture of vaginal swabs and blood.

    48. 2. Vaginal Discharge Vaginal discharge is common after any ablative procedure and is usually self limiting. LATE ONSET COMPLICATIONS

    49. 3. Adhesion Formation Intrauterine adhesions are common especially after myomectomy when two fibroids are situated on opposing uterine walls. In this case the myomectomy is better performed in stages to prevent adhesion formation. LATE ONSET COMPLICATIONS

    50. 3. Adhesion Formation An intrauterine device and Administration of oestrogen and progestogen therapy may help to prevent adhesion formation following: Resection, Adhesiolysis or Division of a septum. LATE ONSET COMPLICATIONS

    51. FAILURE OF RESOLUTION OF THE PRESENTING SYMPTOMS The procedure may fail to cure the presenting symptoms. This may be because of poor patient selection or failure of the surgery.

    52. Approximately 15% of patients have an early pregnancy loss following septum resection (Taylor & Gordon, 1993). There is also greater risk of third stage complications. FAILURE OF RESOLUTION OF THE PRESENTING SYMPTOMS

    53. Myomectomy for menorrhagia or infertility gives disappointing results. About 20% have no immediate improvement and 80% fail to conceive.

    54. Endometrial ablation produces amenorrhoea in about 30% of cases and satisfactory improvement in about another 50%. 10% will require further surgery which may be a repeat ablation or hysterectomy.

    55. Adhesiolysis for Asherman's syndrome is only curative in about 30-40% of cases. FAILURE OF RESOLUTION OF THE PRESENTING SYMPTOMS

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