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Created page with '{{unfinished}} Most often due to an infective agent. In most cases myocarditis is a result of a generalised infection, myocarditis is rarely an isolated primary condition. Cl…'
{{unfinished}}
Most often due to an infective agent. In most cases myocarditis is a result of a generalised infection, myocarditis is rarely an isolated primary condition.
Classified as:
===Acute Suppurative===
Follows from the dissemination of septic emboli form suppurative foci therefore always follows pyaemia. Original septic foci may be:
*Joint ill.
*Umbilical abcess.
*Metritis.
*Mastitis.
*Valvular endocarditis.
May also be a result of extension from the endocarium or pericardium.
===Acute non-suppurative===
[[Image:parvovirus dog.jpg|right|thumb|125px|<small><center>'''Parvovirus (dog)'''. Courtesy of T. Scase</center></small>]]
Usually results from a septicaemia or viraemia E.g [[Parvoviridae|Parvovirus]] infection in puppies.
Also includes:
*Foot and Mouth Disease.
*Leptospirosis.
*Pasteurellosis.
'''''Parvovirus Infection of puppies''''':
Parvovirus affects rapidly dividing cells which are found in the GI tract, and in the growing pup, the myocardium. Myocardial cells divide up to approximately 2 weeks of age and so this is when the infection has an effect although clinical signs may not become apparent until later in life.
[[Image:Parvovirus myocarditis.jpg|right|thumb|125px|<small><center>'''Parvoviral Myocarditis'''. Courtesy of A. Jefferies</center></small>]]
Two cardiac syndromes exist:
*'''Sudden death, 3-8 weeks:''' Cardiac failure with pulmonary oedema etc. Histologically see multifocal myocardial necrosis due to viral replication within the myocardium. May see large basophilic intranuclear inclusion bodies.
*'''Puppies >8 weeks:''' See dyspoea, weakness, collapse and death within 24 hours. In this case cardiac failure occurs due to myocardial fibrosis.
===Chronic===
Myofibrils replaced by fibrous tissue during healing. May be a sequale of previous acute myocarditis.
===Parasites===
Parasites also may cause myocarditis. parasitic larvae may encyst in the myocardium, including:
*Cysticercosis.
*Sarcocystis.
*[[Tissue_cyst-forming_coccidia|Toxoplasmosis]].
[[Category:Myocardial_Pathology]][[Category:Cardiovascular_System_-_Inflammatory_Pathology]]
Most often due to an infective agent. In most cases myocarditis is a result of a generalised infection, myocarditis is rarely an isolated primary condition.
Classified as:
===Acute Suppurative===
Follows from the dissemination of septic emboli form suppurative foci therefore always follows pyaemia. Original septic foci may be:
*Joint ill.
*Umbilical abcess.
*Metritis.
*Mastitis.
*Valvular endocarditis.
May also be a result of extension from the endocarium or pericardium.
===Acute non-suppurative===
[[Image:parvovirus dog.jpg|right|thumb|125px|<small><center>'''Parvovirus (dog)'''. Courtesy of T. Scase</center></small>]]
Usually results from a septicaemia or viraemia E.g [[Parvoviridae|Parvovirus]] infection in puppies.
Also includes:
*Foot and Mouth Disease.
*Leptospirosis.
*Pasteurellosis.
'''''Parvovirus Infection of puppies''''':
Parvovirus affects rapidly dividing cells which are found in the GI tract, and in the growing pup, the myocardium. Myocardial cells divide up to approximately 2 weeks of age and so this is when the infection has an effect although clinical signs may not become apparent until later in life.
[[Image:Parvovirus myocarditis.jpg|right|thumb|125px|<small><center>'''Parvoviral Myocarditis'''. Courtesy of A. Jefferies</center></small>]]
Two cardiac syndromes exist:
*'''Sudden death, 3-8 weeks:''' Cardiac failure with pulmonary oedema etc. Histologically see multifocal myocardial necrosis due to viral replication within the myocardium. May see large basophilic intranuclear inclusion bodies.
*'''Puppies >8 weeks:''' See dyspoea, weakness, collapse and death within 24 hours. In this case cardiac failure occurs due to myocardial fibrosis.
===Chronic===
Myofibrils replaced by fibrous tissue during healing. May be a sequale of previous acute myocarditis.
===Parasites===
Parasites also may cause myocarditis. parasitic larvae may encyst in the myocardium, including:
*Cysticercosis.
*Sarcocystis.
*[[Tissue_cyst-forming_coccidia|Toxoplasmosis]].
[[Category:Myocardial_Pathology]][[Category:Cardiovascular_System_-_Inflammatory_Pathology]]