Hypertrophic Cardiomyopathy (HCM) has been documented as a hereditary trait in the Siberian breed. It is a devastating illness that can show at any age. Lines carrying HCM have been identified by Siberian Research, and several universities are searching for genetic changes that may be causing Siberian HCM.
The records below have been openly released or published by the sources noted. In many cases SRI was asked to publish the information. Information has been collected from open source records, breeder websites, and records that were submitted directly to SRI. Open source records include: SäSK - Sällskapet Sibirisk Katt, PawPeds and Gesundheit von Rassekatzen, and Sibirkattens Venner.
Records may include ultrasound by cardiologists, necropsy by medical centers, or veterinary observation at time of death which may or may not include necropsy. Because HCM has different presentations, equivocal HCM cases as well as DCM (dilated cardiomyopathy) and FHC (focal hypertrophic cardiomyopathy) have been listed. Listings are the based on the opinion of the professional who signed the record. SRI recognizes that both echocardiograms and necropsies are subject to professional interpretation.
Some listings show "Retested Normal", or "Other Heart Disease". These reports show where a cardiologist made a decision that the changes were not HCM. Non-genetic thickening of heart walls can be temporary or permanent. These changes can be caused by hypertension (blood pressure), hyperthyroidism (thyroid hormone), hypermegaly (growth hormone), as well as physical stress caused by pregnancy and nursing. Testing for hyperthyroidism should be perfomed in most cases where older cats have heart changes.
This listing is a small number of the Siberians that have HCM, but it helps breeders know where HCM has been mapped in the breed. Only by understanding the risks associated with some prominent show lines, performing echocardiograms, supporting genetic research, and using careful breeding practices, we will reduce the number of Siberians with this disease.
The officers of Siberian Research would like to thank both breeders and pet owners who have openly discussed and disclosed information about HCM cases and sudden deaths in the breed. Many of these individuals have also submitted DNA to the universities studying the genes involved.
| Name of Cat | Diagnosis | Release From | Record Holder / Public Listing | Basis |
| Akiulina Du Palais Monplaisir | Focal HCM | Owner | G Rassekatzen | Echocardiogram |
| Aleigas Alexei | Equivocal | Owner | Pawpeds | Echocardiogram |
| Aleigas Amazing Golden Shico | Equivocal | Owner | Pawpeds | Echocardiogram |
| Alizarin Blooming Cherry | HCM | Breeder & Pet Owner | Pet Owner | Necropsy |
| Amante Galante "Simba" | HCM | Breeder & Pet Owner | Amante's | Echocardiogram |
| Avangard Splash | HCM | Pet Owner | SRI | Echocardiogram |
| Bathia B'Elana vom Jahnatal | Focal HCM | Owner | Pawpeds | Echocardiogram |
| Birchgrove Ban Sergei of Actrose | Dilated CM | Breeder & Owner | SRI | Necropsy |
| Birchgrove Micky | HCM | Breeder | SRI | Echocardiogram |
| Birchgrove Redrick | HCM | Breeder | SRI | Echocardiogram |
| Birchgrove Simba | HCM | Breeder | SRI | Echocardiogram |
| Birchgrove Treasure | HCM | Breeder | SRI | Echocardiogram |
| Biroska iz Konnji Cwora | HCM | Owner | G Rassekatzen | Echocardiogram |
| Boris | HCM | Owner | Pawpeds | Echocardiogram |
| Bradiaga vom Bernsteinzimmer | HCM | Owner | Pawpeds | Echocardiogram |
| Bubastis' Sofinisba Anguissola | Other Diagnosis | Owner | Pawpeds | Echocardiogram |
| Casimir vom Hülserberg | HCM | Owner | G Rassekatzen | Echocardiogram |
| Catreba Sigizmund | HCM | Breeder & Pet Owner | Catreba | Echocardiogram |
| Circumpolare Persostrat | Equivocal | Owner | SRI | Echocardiogram |
| Croshka Mr Winston Svetovich | HCM | Breeder & Pet Owner | SRI | Echocardiogram |
| Croshka Tigger Nicoli of Obravo | HCM | Breeder & Pet Owner | SRI | Vet exam at death |
| Dust & Dawn Chefren | Other Diagnosis | Owner | Pawpeds | Echocardiogram |
| EmeraldForest Andrei Mika | HCM | Pet Owner | SRI | Vet exam at death |
| EmeraldForest Kisa | HCM | Pet Owner | SRI | Vet exam at death |
| EmeraldForest Tosca of GoldenDawn | Equivocal | Owner | GoldenDawn | Echocardiogram |
| FabulaFelis Egregia | HCM | Owner | Catreba | Echocardiogram |
| Fedora Ionessy | Retested Normal | Owner | Pawpeds | Echocardiogram |
| Filija von Mufasa | Equivocal | Owner | Pawpeds | Echocardiogram |
| Fjodor | HCM | Owner | Pawpeds | Echocardiogram |
| Freya Siberian Star | HCM | Owner | Bella Bohemia | Echocardiogram |
| Gagarin Sibaris | Equivocal | Owner | av Holskogen | Echocardiogram |
| Gorabellas Basnia Bellochka | Retest Normal | Owner | Pawpeds | Echocardiogram |
| Gorabellas Judita | Other Diagnosis | Owner | Pawpeds | Echocardiogram |
| Innokentiy Veshij Son | Retested Normal | Owner | Pawpeds | Echocardiogram |
| Isrosen Orion | HCM | Owner | Pawpeds | Echocardiogram |
| Isrosens Sesam | HCM | Owner | Pawpeds | Echocardiogram |
| Isrosens Sinbad | HCM | Breeder & Pet Owner | Pawpeds | Echocardiogram |
| Jenisij Silva Line | HCM | Owner | Astera | Echocardiogram |
| KatyMcFur Savka | Murmur IV | Pet Owner | SRI | Echo Pending |
| KatyMcFurr Tiakka | HCM | Pet Owner | SRI | Necropsy |
| KatyMcFur Wrigley | HCM | Pet Owner | Pet Owner | Vet exam at death |
| Kazol's Bissan | HCM | Owner | Solstroms | Echocardiogram |
| Kazols Bivven | HCM | Owner | Pawpeds | Echocardiogram |
| Klintgardens Karelin | Equivocal | Owner | Pawpeds | Echocardiogram |
| Klintgården's Nadiya | Equivocal | Owner | Pawpeds | Echocardiogram |
| Klintgården's Pusjkin | HCM | Owner | Owner | Necropsy |
| Klintgården's Ragolin | Equivocal | Owner | Pawpeds | Echocardiogram |
| Knjaze Feniks Sokol | Equivocal | Owner | Pawpeds | Echocardiogram |
| Knjaze Jasnij Svet | Other Diagnosis | Owner | Pawpeds | Echocardiogram |
| Knjaze Nazar | HCM | Owner | Pawpeds | Echocardiogram |
| Knjaze Nestor | HCM | Owner | Pawpeds | Echocardiogram |
| Knjaze Samarkand | Equivocal | Owner | Pawpeds | Echocardiogram |
| Laguna Syberiana Houdiny Dadushovic | Equivocal | Owner | Lumikissan | Echocardiogram |
| Lexcon's Vargtass | Equivocal | Owner | Pawpeds | Echocardiogram |
| Lillefot's Zorro | Equivocal | Owner | Pawpeds | Echocardiogram |
| Ludvigs Konrad | HCM | Owner | Pawpeds | Echocardiogram |
| Lumikissan Igor | HCM | Breeder | Lumikissan | Echocardiogram |
| Mantas Quattro | Equivocal | Owner | Pawpeds | Echocardiogram |
| Masjka's Zofija Azika | HCM | Owner | Pawpeds | Echocardiogram |
| Meldgaards Archangelsk | HCM | Owner | Pawpeds | Echocardiogram |
| Minnilän Idefix | DCM | Owner | Taimyrin | Necropsy |
| Nani | Other Diagnosis | Owner | Pawpeds | Echocardiogram |
| Newskij's Little RedRidinghood "Ginger" | HCM | Pet Owner | G Rassekatzen | Echocardiogram |
| Newskij's Nobody's Perfect | HCM | Owner | G Rassekatzen | Echocardiogram |
| Nikopeja's Boromir | HCM | Owner | Pawpeds | Echocardiogram |
| Nikopeja's Channa | Sudden Death | Breeder | Nikopeja | No Necropsy |
| Nikopeja's Cibor | Equivocal | Owner | Pawpeds | Echocardiogram |
| Nikopeja's Csilla | HCM | Owner | Pawpeds | Echocardiogram |
| Nikopeja's Eliana | Equivocal | Owner | Pawpeds | Echocardiogram |
| Nikopeja's Elisei | HCM | Breeder | Nikopeja | Echocardiogram |
| Nikopeja's Feliks | Equivocal | Owner | Pawpeds | Echocardiogram |
| Nikopeja's Korsak Kasianovich | Retested Normal | Owner | Pawpeds | Echocardiogram |
| Norrviken's Mimmi | HCM | Owner | Pawpeds | Echocardiogram |
| Obravo Prince Tucker | HCM | Pet Owner | SRI | Echocardiogram |
| Obravo Tigger | HCM | Pet Owner | SRI | Vet exam at death |
| Onix Gloria Anfisa "Fisha" | HCM | Owner | Precious Paws | Necropsy |
| Onix Gloria Prokhor | HCM | Owner | SRI | Necropsy |
| Onix Gloria Svet of Croshka | Equivocal | Owner | SRI | Echocardiogram |
| Passionata Enzo | HCM | Owner | Sibirkattens Venner | Echocardiogram |
| Pinecat's Amadeus | HCM | Owner | Catreba | Echocardiogram |
| Rossity Sheldon | HCM | Owner | Gaupenkatten | Echocardiogram |
| Russian House Jandor | HCM | Owner | G Rassekatzen | Echocardiogram |
| Sibano Briar Rose of GoldenDawn | Equivocal | Owner | GoldenDawn | Echocardiogram |
| Sibano Faya Tsarevna of GoldenDawn | Equivocal | Owner | GoldenDawn | Echocardiogram |
| Sibano Stella the Silver Stunner | HCM | Owner | SRI | Echocardiogram |
| Sibericat Mauritz | Equivocal | Owner | Siberkattens Venner | Echocardiogram |
| Sibericat Peter | HCM | Owner | Pawpeds | Echocardiogram |
| Sibericat Zara | HCM | Owner | Pawpeds | Echocardiogram |
| Silveråsen's Filimon | HCM | Owner | Pawpeds | Echocardiogram |
| Silveråsen's Firmin | HCM | Owner | Pawpeds | Echocardiogram |
| Siperiankulta Diamond | HCM | Breeder & Pet Owner | Siperiankulta | Echocardiogram |
| Siperiankulta Honeysuckle | HCM | Owner | Pawpeds | Echocardiogram |
| Solberga Zafirs Boris | Retested Normal | Owner | Pawpeds | Echocardiogram |
| Spirit of New Heaven's Yanosh | Equivocal | Owner | Pawpeds | Echocardiogram |
| Staffansgårdens Beliji | Equivocal | Owner | Pawpeds | Echocardiogram |
| Staffansgårdens Maksian Sinishko | HCM | Owner | Pawpeds | Echocardiogram |
| Stimics Callas | Other Diagnosis | Owner | Pawpeds | Echocardiogram |
| Stimics Fantastic Matisse | Retested Normal | Owner | Pawpeds | Echocardiogram |
| Stimics Mr Lemminkäinen | HCM | Owner | Pawpeds | Echocardiogram |
| Stimics Mr Mainio | HCM | Owner | Sibirkattens Venner | Echocardiogram |
| Stimic's Silver Dream | Equivocal | Owner | Pawpeds | Echocardiogram |
| Tinuviel Keiko | HCM | Pet Owner | SRI | Echocardiogram |
| Ugglemossens Alfonz | HCM | Owner | Pawpeds | Echocardiogram |
| Ugglemossens Anakin | HCM | Owner | Pawpeds | Echocardiogram |
| Villan Daphne Tevez | Equivocal | Owner | Pawpeds | Echocardiogram |
| Windrifter Cholchinay | HCM | Owner | SRI | Necropsy |
| Yustas of Croshka | HCM | Owner | SRI | Necropsy |
| Zanadu Clementine | HCM | Breeder & Pet Owner | SRI | Echocardiogram |
| Zanadu Tangier | HCM | Breeder & Pet Owner | SRI | Echocardiogram |
| Zarev Maxim Cheopsovitj | Mild | Owner | Pawpeds | Echocardiogram |
| Zaroya's Anya | HCM | Owner | Pawpeds | Echocardiogram |
| Zelda | Other Diagnosis | Owner | Pawpeds | Echocardiogram |