Temperature preferences and electrocardiography of Elaphe obsoleta (serpentes)

Jacob, James S.; McDonald, Harry S.

doi:10.1016/s0300-9629(75)80005-3

Cited by 14 publications

(5 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A lth o u g h h ig h te m p e ra tu re increased the P segm ent, it decreased S-T duration, R -R dura tion and cardiac axis. This effect o f tem perature in ectotherms is not unusual and has also been described for other species of squam ata (Jacob andM cD onald, 1975, C ook andWestrom, 1979). As consequence, a special hom eostatic adaptation to different degrees o f therm al variation due to the ecological p a rtic u la ritie s o f th e rocky, w arm and sunny areas w here these giant lizards live is suspected.…”

Section: Discussionsupporting

confidence: 73%

Electrocardiographic Parameters in the Gomeran Giant Lizard, Gallotia bravoana

Martinez‐Silvestre¹,

Mateo²,

Pether³

2003

Journal of Herpetological Medicine and Surgery

View full text Add to dashboard Cite

Electrocardiographic param eters w ere determ ined fo r one o f the m ost endangered species in the w orld, the G om eran giant lizard, Gallotia bravoana, w ith a population o f only ten captive individuals in the world. H eart rate, rhythm , am plitude o f P, R, S and T w aves, interval o f RR, PR, Q T and ST w aves, duration of P, QRS, T waves, description o f SV w ave (representing depolarisation o f the sinus venosus), m ean electrical a x is , a n d c o r r e la tio n w ith c lo a c a l te m p e r a tu r e a n d w e ig h t w e re d e te r m in e d in th is p o p u la tio n. Electrocardiographic tracings showed a positive QRS com plex, presence o f an SV w ave, and T w aves occasion ally negative. Positive correlation w as observed betw een electrical axis and w eight, P duration and am bient tem perature, and S am plitude and cardiac frequency. N egative correlation w as observed betw een electrical axis and cloacal tem perature, S-T duration and the am bient tem perature, R-R interval and the cloacal tem perature, and R-R interval and cardiac frequency. This is the first com plete description o f the electrocardiographic para m eters o f a giant lizard o f Lacertidae fam ily and genus Gallotia.

show abstract

Section: Discussionsupporting

confidence: 73%

Electrocardiographic Parameters in the Gomeran Giant Lizard, Gallotia bravoana

Martinez‐Silvestre¹,

Mateo²,

Pether³

2003

Journal of Herpetological Medicine and Surgery

View full text Add to dashboard Cite

show abstract

“…Fourthly and finally, the T wave was commonly found to be very wide and of variable morphology between corn snakes, as has been reported in other reptile species 21 27 29 . This segment was approximately two to three times longer than the QT of mammals but, similar to mammals, was around twice the duration of the PR (PQ) interval.…”

Section: Discussionmentioning

confidence: 64%

“…In some cases this shortening was so extreme that there was merging of T and P waves. Germer et al 38 mentioned T and P wave merging in a group of geckos, while Mullen 19 and Jacob and McDonald 29 described wave overlap at the TP interval or ‘masking’ of the P wave by the T wave in cohort subgroups of wild caught snakes. These authors do not speculate on the possible causes of this finding, but Clarke and Marx 18 identified handling stress as an important cause of increased HRs in wild caught snakes.…”

Section: Discussionmentioning

confidence: 99%

Standardisation of electrocardiographic examination in corn snakes (Pantherophis guttatus)

Lewis

Bouvard²,

Eatwell³

et al. 2020

Veterinary Record

View full text Add to dashboard Cite

IntroductionCorn snakes are a very common pet reptile species, yet there is an absence of evidence-based literature standardising collection of ECG or detailing ECG deflection morphology in the normal animal. The authors describe a well-tolerated, reproducible technique and detail the cardiac cycle in terms of lead 2 equivalent waveforms and intervals.Animals29 adult corn snakes.Materials and methodsThis prospective study evaluated, under species-appropriate, standardised conditions, a technique for producing standard six-lead ECG tracings. Lead 2 equivalent cardiac cycles were described in detail and statistically analysed for sex, weight, length, heart rate and mean electrical axis.ResultsHigh-quality tracings demonstrated common ECG characteristics for this species, including no Q, S or SV waves, prolonged PR and RT intervals, rhythmic oscillation of the baseline, short TP segments, and a right displaced mean electrical axis. An influence of sex, weight or length on heart rate and mean electrical axis was not identified.ConclusionsTo the authors’ knowledge, this is the first study to describe a standardised technique for recording ECG in significant numbers of normal corn snakes. Ranges have been provided that may be of diagnostic value or form the basis for future development of reference intervals for this species.

show abstract

“…Cardiac function is maximized when a reptile is maintained within its preferred temperature range. Hence, body temperature induces several changes in ECG parameters ( Jacob and McDonald, 1975 ), and this what Boukens et al (2022) investigated.…”

Section: From Mammals To Reptilesmentioning

confidence: 96%