Difference between revisions of "Traumatic Reticulitis"

Revision as of 15:57, 11 August 2010

Description

Due to their unselective feeding habits, cattle may injest a variety of foreign bodies. Heavier metallic objects consumed can become lodged in the reticulum, and may penetrate the reticular wall under the influence of the continuous reticular movements. This is enhanced in pregnancy and parturition.

Pathological changes depend on the direction of penetration; this is usually in an anterior-ventral direction. Pyogenic bacteria escape from the reticulum, causing localised peritonitis, local fibrinous adhesions Penetration of the diaphragm and pericardium resulting in pericarditis.Penetration of the heart itself resulting in myocarditis and endocarditis Penetration of the lungs and pleura resulting in pneumonia and pleurisy Liver and splenic abscesses

Signalment

More frequently affects adult dairy cows but does also affect beef animals. More comon in cows grazing a pasture where there has been previous building.

Diagnosis

Clinical Signs

Signs are often vague, but adult cattle will show a drop in milk production and fecal output is decreased. The rectal temperature is often mildly increased. The heart rate is often increased, and respiration is usually shallow and rapid. Initially, the cow exhibits abdominal pain with an arched back; and a reluctance to move often with abducted elbows. Affected animals will also grunt in response to the "bar test".

Pathogenesis

Cattle cannot spit out metallic agents (e.g. screws, nails, pieces of wire, bottle tops)once in their mouths, and so ingest them.
Objects often become sharper in the reticulum due to reticular juices.

Pathology

Pericardium is enormously thickened with oedema, and purulent fluid containing fibrin clots accumulates in the sac giving “bread and butter heart” - classical traumatic reticulitis.

Traumatic pericarditis (Courtesy of BioMed Image Archive)

Large abscesses in the dorsal part of the liver may erode into posterior vena cava to produce thrombosis.

* Very thick-walled, pus-filled abscesses form around points of penetration, which may be multiple.
The foreign object may be found in one of these abscesses, or free in the reticular lumen

@@ Line 1: / Line 1: @@
-Also known as: '''''Hardware Disease — Traumatic Reticuloperitonitis — Wires
+{{unfinished}}
-Also see:''' [[Traumatic Pericarditis]]
+==Description==
+Due to their unselective feeding habits, cattle may injest a variety of foreign bodies. Heavier metallic objects consumed can become lodged in the [[The Reticulum - Anatomy & Physiology|reticulum]], and may penetrate the reticular wall under the influence of the continuous [[The Reticulum - Anatomy & Physiology#Ruminoreticular contraction|reticular movements]]. This is enhanced in pregnancy and parturition.
-==Introduction==
+Pathological changes depend on the direction of penetration; this is usually in an anterior-ventral direction. Pyogenic bacteria escape from the [[The Reticulum - Anatomy & Physiology|reticulum]], causing localised peritonitis, local fibrinous adhesions
-[[Image:traumatic reticulitis.jpg|right|thumb|200px|<small><center>'''Traumatic pericarditis'''. Courtesy of A. Jefferies</center></small>]]
+Penetration of the diaphragm and pericardium resulting in [[Pericarditis|pericarditis]].Penetration of the heart itself resulting in myocarditis and endocarditis
-Due to their unselective feeding habits, cattle may ingest a variety of foreign bodies. Cattle cannot spit out metallic agents (e.g. screws, nails, pieces of wire, bottle tops) once in their mouths, and so ingest them. Heavier metallic objects consumed can become lodged in the [[Reticulum - Anatomy & Physiology|reticulum]], and may penetrate the reticular wall under the influence of the continuous [[Reticulum - Anatomy & Physiology#Ruminoreticular contraction|reticular movements]] or forces caused by pregnancy and parturition.
+Penetration of the lungs and pleura resulting in pneumonia and pleurisy
+Liver and splenic abscesses
-Pathological changes depend on the direction of penetration; this is usually in an anterior-ventral direction. Pyogenic bacteria escape from the reticulum, causing localised [[Peritonitis|peritonitis]] and local fibrinous adhesions.
-Penetration of the [[Diaphragm - Anatomy & Physiology|diaphragm]] and [[Heart Structure - Anatomy & Physiology#Pericardium|pericardium]] results in [[Traumatic Pericarditis|pericarditis]]. Penetration of the [[Heart - Anatomy & Physiology|heart]] itself results in [[Myocarditis|myocarditis]] and [[Endocarditis|endocarditis]]. Penetration of the [[Lungs - Anatomy & Physiology|lungs]] and pleura can occur resulting in pneumonia and pleurisy.
-Liver and splenic abscesses also occasionally occur following penetration of either organ.
 ==Signalment==
-More frequently affects adult dairy cows but does also affect beef animals. More common in cows grazing a pasture where there has been a previous building.
+More frequently affects adult dairy cows but does also affect beef animals. More comon in cows grazing a pasture where there has been previous building.
 ==Diagnosis==
-Can often be made following a good history and physical exam.
 ==Clinical Signs==
 Signs are often vague, but adult cattle will show a drop in milk production and fecal output is decreased. The rectal temperature is often mildly increased. The heart rate is often increased, and respiration is usually shallow and rapid. Initially, the cow exhibits abdominal pain with an arched back; and a reluctance to move often with abducted elbows.
+Affected animals will also grunt in response to the "bar test".
+====Pathogenesis====
-Affected animals will also grunt in response to the 'bar test' - Two people, one on each side of the cow, hold a bar/pole underneath the animal in the region behind its front legs. They attempt to 'lift' the cow and the cow grunts in response to the pressure on its chest.
+* Cattle cannot spit out metallic agents (e.g. screws, nails, pieces of wire, bottle tops)once in their mouths, and so ingest them.
+* Objects often become sharper in the [[The Reticulum - Anatomy & Physiology|reticulum]] due to reticular juices.
-==Laboratory Tests==
+*
-Although not always necessary, can sometimes be useful to rule out other differential diagnoses.
-On haematology a [[Neutrophilia|neutrophilia]] will be present with a left shift.
-Fibrinogen and total protein levels will also be high.
-A hypokalaemia and hypochloraemia with a metabolic alkalosis will also be present.
-A peritoneal tap is a useful diagnostic aid to establish if peritonitis is present, if so a high protein and a high cell count will be evident. These parameters however will return to normal once the infection has already been walled off into an abscess.
-==Pathology==
-[[Image:traumatic pericarditis.jpg|thumb|right|150px|Traumatic pericarditis (Courtesy of BioMed Image Archive)]]
-Thick walled, pus filled abscesses form around the points of penetration, which may be multiple.
-The foreign object may be found in one of these abscesses, or free in the reticular lumen.
-If the pericardium is penetrated it becomes thickened with oedema, and purulent fluid containing fibrin clots accumulates in the sac giving  a “bread and butter heart” which is classical of traumatic reticulitis.
-Additionally if the liver is affected large abscesses in the dorsal part of the liver may erode into the posterior vena cava to produce a [[Thrombosis|thrombosis]].
-==Treatment==
-Typically these cases are recognised late in the course of disease and euthanasia is often the most economical option.
-If the condition is diagnosed early in the course of disease then treatment can be medical or surgical.
-Medically [[antibiotics|antibiotics]] can be administered in order to treat the peritonitis and a broad spectrum antibiotic such as [[Tetracyclines|oxytetracycline]] is a good choice.  A magnet should also be administered to prevent further metal penetration of the reticulum.  Restricting the movement of the animal may also prevent further penetration of the foreign object.
-Surgery involves a rumenotomy allowing removal of the object. If an abscess is adhered to the reticulum, it should be drained into the reticulum. Antibiotics should also be given perioperatively.
-==Prevention==
-Animals should not graze fields where they may have access to metal objects or where construction has recently taken place. Pastures should be cleared as much as possible of metal wire and such like prior to animals grazing. Additionally magnets can be administered to the cattle orally, these then remain in the reticulum and if metal objects are ingested they will remain attached to the magnet.
-==Literature Search==
-[[File:CABI logo.jpg|left|90px]]
-Use these links to find recent scientific publications via CAB Abstracts (log in required unless accessing from a subscribing organisation).
-<br><br><br>
-[http://www.cabdirect.org/search.html?q=%28%28title%3A%28traumatic%29+AND+%28title%3A%28reticulitis%29+OR+title%3A%28reticuloperitonitis%29+OR+title%3A%28pericarditis%29%29%29+OR+title%3A%28%22hardware+disease%22%29%29+AND+od%3A%28cattle%29 Traumatic Reticulitis in cattle publications]
-==References==
+====Pathology====
-Merck & Co (2008) '''The Merck Veterinary Manual''' (Eighth Edition) ''Merial''
+ Pericardium is enormously thickened with oedema, and purulent fluid containing fibrin clots accumulates in the sac giving  “bread and butter heart” - classical traumatic reticulitis.[[Image:traumatic pericarditis.jpg|thumb|right|150px|Traumatic pericarditis (Courtesy of BioMed Image Archive)]]
+Large abscesses in the dorsal part of the [[Liver - Anatomy & Physiology|liver]] may erode into posterior vena cava to produce thrombosis.
-{{review}}
+* * Very thick-walled, pus-filled abscesses form around points of penetration, which may be multiple.
-[[Category:Forestomach - Inflammatory Pathology]][[Category:Gastric Diseases - Cattle]]
+* The foreign object may be found in one of these abscesses, or free in the reticular lumen[[Category:Forestomach - Inflammatory Pathology]][[Category:Cattle]][[Category:To_Do_-_Caz]]
-[[Category:Brian Aldridge reviewing]]