Presentation on theme: "Uterine Torsion in Mares"— Presentation transcript:
1Uterine Torsion in Mares Stevie WillettVETE 402 Advanced Medical TerminologyWeek 8 Mid-Term
2What is a Uterine Torsion and Which Mares Get It? Malposition of the uterusA twist of degrees on the uterus’s long axis.A twist can either be clockwise or counterclockwise.Rarely involves the cervix or vagina.Pregnant mares normally have uterine torsions.Occurs typically mid to late gestation/pregnancy (Gestation is 11 months in a mare)Uterine torsions can also have concurrent intestinal blockage or the intestines can become incorporated or part of the torsion.
3Clinical Signs What Will A Mare Do If She Has A Uterine Torsion? Show signs of colic (abdominal pain):Kicking at bellyExcessive rollingFrequent pawing at the groundGetting up and down frequentlyLooking at abdomen frequentlyAdditional clinical signs:RestlessnessLethargic (quiet, depressed, not very responsive)Anxiety (worried look on face, wide eyed, rapid breathing)Anorexic (not wanting to eat)Increased heart rate upon examSedatives and pain medication will not last long.Uterine torsion should be suspected in any pregnant mare showing signs of colic
4Physical Exam What Will The Veterinarian Will Do? The veterinarian will ask about the mare’s breeding history and her due date.The Veterinarian will perform a complete physical exam:TemperatureHeart RateRespiration RateMucus membranes (Gums) will be assessed for color and moistness.Capillary refill time will be assessed to determine perfusion (blood flow)The veterinarian will listen for gastrointestinal sounds in the four quadrants
5Diagnostics: What Else Will The Veterinarian Do? The veterinarian will perform a rectal palpationUterine torsions in horses are typically diagnosed by rectal palpation of the broad ligaments of the uterus.A tight broad ligament is felt coursing side to side in the direction of the torsionA torsion can be either clockwise or counterclockwiseThere can be between a degree twist with the normal twist being 180 degreesThe direction of the torsion can be determined by the placement of the broad ligaments.Clockwise torsion in present if the left ligament is tightly stretched along the top of the abdomen and courses toward the right lower abdomen with the right ligament diving downward along the right side of the body wall.
6Additional Diagnostics Ultrasound of the abdomen from the outside.The ultrasound will help view the fetus to determine if the fetus is stressed or still alive.An ultrasound can also determine the health of the uterus (Thickened or inflamed).Concurrent gastrointestinal disease can also be determined by an ultrasound exam.Abdominocentesis (Taking a sample of fluid from the abdomen with the use of a needle or cannula)This can also determine if there is concurrent gastrointestinal disease.The use of an ultrasound will help to insure that the uterus will not be harmed when taking a sample.
7Treatments Treatment Should Start Immediately After Diagnosis Treatments Treatment Should Start Immediately After Diagnosis! How Will The Veterinarian Help The Mare?Nonsurgical Treatment:Rolling the mare under general anesthesia while applying abdominal pressure with a plank.The mare is place on her side toward the side of that the torsion is rotated.The plank helps maintain the fetus and uterus in position while the mare is rolled around them. A moderate size person stands or kneels on the plank.The mare is rolled several times until she has been rolled in a 360 degree direction.The mare must be rolled in the direction of the torsion.Rectal palpation by the veterinarian will determine if the torsion is resolved. If not resolved the procedure may need to be repeated.After correcting the torsion the mare is recovered (woken up) and rectally palpated again while standing to ensure torsion is corrected.NOTE: Nonsurgical options might be more successful in mare during the middle months of pregnancy. NOT recommended in full term maresIf no improvement is seen within 1 hour surgical correction should be pursued.
8Advantages and Disadvantage to Rolling Mares With Uterine Torsions Ability to perform on a farm and in the field.Does not cost as much as surgical correction.May be more successful in mares during the middle of pregnancyDisadvantagesSeveral people are needed to help roll the mare.The placenta may detach prematurelyAbortion may occurMares death or fetal death may occur.Uterine rupture may occurDoes not allow visualization of uterus or gastrointestinal lesions.Rolling the mare may be unsuccessful.
9Additional Treatment What Happens If Rolling Did Not Help? If the cervix is open and the mare is close to term or due date: (Rare since most torsions occur before term and due date)Manual rotation of fetus and uterus can be attempted.A well lubed hand is passed in to the uterus to grasp the fetus.The fetus and uterus is gently and rocked gradually together until the torsion is fixed.Obstetric chains (placed on fetus’s limbs) and a detorsion rod (placed in uterus) can also be used to help with rotating the torsionThis treatment is usually possible if the torsion is less than 270 degrees rotated.NOTE: Procedure could cause injury to the mare’s uterus or cervix or injury to the fetus.Mare will enter stage 2 of labor after procedure which might require an assisted delivery.
10Surgical Correction What Are Some Other Options For Correcting Uterine Torsions? Flank IncisionVentral Mid-line Incision Approach
11Flank Incision Approach The mare is standingSedation is used to keep mare calm and quietThe flank area is blocked (numbed) with local anesthetic so the mare cannot feel the area. Then the area is clipped and cleaned so it is sterile. Epidural anesthesia can be use, but risk of mare collapsing is a possibilityAn ultrasound can be used during and after surgery to monitor the fetus or to confirm if fetus is dead.
12Flank Incision Approach Continued: The flank incision is made on the side toward which the uterus is twisted.An incision on the opposite side of the mare may also be needed if correction is difficult2 incisions allows for a second surgeon to help with manipulation simultaneouslyThe surgeon places his/her hand under the uterus horn which contains the fetus. The uterus and fetus are rocked back and forth to allow the uterus to flip into normal position.It is recommended to lift and push uterus and fetus rather than pullThis will reduce the chance of puncturing a hole or breaking the uterus.The uterus and broad ligaments will be felt to ensure the torsion was fixed. The fetus will also be assessed to ensure it is still alive.If fetus is dead: The cervix can be dilated and fetus removed after torsion correction, C-Section can be performed soon after flank incision surgery, or the fetus will be expelled 1-2 days after surgery (Mare must be monitored close if assisted delivery is needed.The remainder of the abdominal contents should be palpated to rule out concurrent disease
13Advantages and Disadvantages to Flank Incision Eliminates risk associated with general anesthesia.Less expensiveIdeal for mares who are not anesthetic candidates due to size (too big) or body system compromiseDisadvantagesCorrection of torsion could be challenging or cannot be fixed while mare is standing. (Large foal or size of uterus).This technique could be very painful for the mare.The mare could collapse during surgery which could cause abdominal contents to fall out of incision.
14Ventral Mid-Line Incision Approach When Should a Ventral Mid-Line Incision Be Used? If previous attempts to correct the uterine torsion have failed.If there is concurrent gastrointestinal disease suspected.If the uterus has rupture or torn apart or a C-Section is needed to remove the fetus.If the fetus is dead and the cervix remains closed.If the mare is showing to be in severe pain and might try to collapse during the standing surgery.
15Ventral Mid-Line Approach The mare will be placed under general anesthesia (will be asleep).The mare will be placed on her back on a surgery table.This procedure should be performed in a veterinary hospital.Mechanical ventilation (a ventilator) will most likely be needed to keep the mare well oxygenated.The mare’s pregnant uterus as well as being placed on her back puts pressure on lungs, thus reducing amount of oxygen mare is able to take in.An incision will be made on the abdomen in front of the umbilicus (belly button).A foal care team will be used to assist the foal after delivery (if the foal is alive).The foal care team will be used if a C-Section is needing to be performed.20 liters (1 liter = about 1 quart)of warm 0.9% saline solution can be placed in the abdomen during surgery.This will get the uterus to “float” so manipulation and correction of torsion will be easier and help reduce the risk of tissue damage.
16Advantages and Disadvantages Of A Ventral Mid-Line Incision Best surgical option for failed nonsurgical rolling.Access to abdominal cavity to allow assessment of uterus and abdominal contents (If concurrent gastrointestinal disease is present).DisadvantagesCost might be to high.Increased risks associated with general anesthesia.Sutures and staples can come apart after surgery (during recovery) or during delivery of foal.This could result in abdominal contents spilling out on ground and could end up with the death of the mare.
17Postoperative Care After Flank and Ventral Mid-Line Incisions Postoperative care will depend on mare and fetus, but usually include fluid therapy, antibiotics, and anti-inflammatory drugs.Stall rest is needed for 30 days followed by additional 30 days in a small turnout area. This gives time for the incision to heal.Rolling should be prevented so the reoccurrence of the uterine torsion does not happen again.Mare should be monitored regularly for labor incase assistance is needed.The mare may need to be maintained on supplemental progesterone (Regumate or similar drug) if the fetus is still alive until close to the due date.This will ensure that the cervix remains closed, the uterus will not have contractions, and to prevent abortion of fetusIf the fetus remains alive close monitoring of fetus is needed to ensure it does not become distressed or become compromised and die
18Complications Of Uterine Torsions Premature placental separationUterine wall necrosis (tissue death)Uterine ruptureAdhesions (union of 2 surfaces that are normally separated)Surgery within the abdomen can sometimes cause adhesionsReoccurrence of uterine torsionPeritonitis (inflammation of the peritoneum within the abdominal cavity)Fetal death or AbortionSigns of fetal death or impending abortion:Udder develpoment, loss of cervical mucus plug, vaginal or vulvular discharge, restlessness
19Fetal and Neonatal Complications After Uterine Torsions Death of FetusLack of oxygen to fetus due to decrease blood flow during torsion.Resulting in increase risk for hypoxic-ischemic encephalopathyNeonatal complications increase and are more common when uterine torsion occurs after 320 days of pregnancyBirth of the fetus should be considered high risk
20PrognosisIf the gastrointestinal tract was not involved and minimal compromise to uterine wall then both fetus and mare’s prognosis for survival is good.Prognosis decreases if the uterus ruptured causing a peritonitis. If uterine strangulation occurred prognosis also decreases for fetus.If blood flow or tissue oxygenation was compromised it also reduced prognosis for fetus.No significant difference in mare survival was found between correction methods.Foals survival was best seen when using a flank incision rather than ventral mid-line incision.Uterine torsions are relatively uncommon, but complications can be life threatening for the mare and fetus