Necrophysiological determination of blood pressure in fishes

Jones, David R.; Perbhoo, Kevina; Braun, Marvin H.

doi:10.1007/s00114-005-0046-1

Cited by 6 publications

(3 citation statements)

References 12 publications

(9 reference statements)

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“…This increase of the systolic and diastolic rate of the phasic flow profile could be caused by a change in the wind-kessel effect of the bulbus arteriosus (19). The bulbus probably enables the very large stroke volumes seen in many fishes (37), as well as having the capability to adjust to changes in blood pressure (31). The bulbus receives sympathetic innervation, and Farrell et al (21) indicated that a bulbus-mediated regulation of the pulsatility and hence, the blood flow patterns through the gills could be important in governing its synchrony with the ventilatory movements in fish.…”

Section: Discussionmentioning

confidence: 97%

Cholecystokinin as a regulator of cardiac function and postprandial gastrointestinal blood flow in rainbow trout (Oncorhynchus mykiss)

Seth

Gräns

Axelsson

2010

American Journal of Physiology-Regulatory, Integrative and Comp

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We have studied the potential role of CCK as a regulator/modulator of the postprandial increase in gastrointestinal blood flow. Rainbow trout (Oncorhynchus mykiss) were instrumented with pulsed Doppler flow probes to measure the effects of CCK on cardiac output and gastrointestinal blood flow. Furthermore, vascular preparations were used to study the direct effects of CCK on the vessels. In addition, we used in situ perfused hearts to further study the effects of CCK on the cardiovascular system. When the sulfated form of CCK-8 was injected at a physiological concentration (0.19 pmol/kg) in vivo, there was a significant increase in the gastrointestinal blood flow (18 +/- 4%). This increase in gastrointestinal blood flow was followed by a subsequent increase in cardiac output (30 +/- 6%). When the dose was increased to 0.76 pmol/kg, there was only a 14 +/- 6% increase in gastrointestinal blood flow; possibly due to a dose-dependent increase in the gill vascular resistance as previously reported or a direct effect on the heart. Nevertheless, CCK did not affect the isolated vessel preparations, and thus, it seems unlikely that CCK has a direct effect on the blood vessels of the second or third order. CCK did, however, have profound effects on the dynamics of the heart, and without a change in cardiac output, there was a significant increase in the amplitude (59 +/- 4%) and rate (dQ/dt: 55 +/- 4%; -dQ/dt: 208 +/- 49%) of the phasic flow profile. If and how this might be coupled to a postprandial gastrointestinal hyperemia remains to be determined. We conclude that CCK has the potential as a regulator of the postprandial gastrointestinal blood flow in fish and most likely has its effect by inducing a gastrointestinal hyperemia. The mechanism by which CCK acts is at present unknown.

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Section: Discussionmentioning

confidence: 97%

Cholecystokinin as a regulator of cardiac function and postprandial gastrointestinal blood flow in rainbow trout (Oncorhynchus mykiss)

Seth

Gräns

Axelsson

2010

American Journal of Physiology-Regulatory, Integrative and Comp

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“…For example, tunas have high metabolic rates and are fast, continuous swimmers compared with other fishes such as trout or carp (Randall, 1970;Bernal et al, 2001;Brill and Lai, 2016). Not surprisingly, ventral aortic blood pressure in tunas (∼12 kPa; Bushnell and Brill, 1992;Jones et al, 2005) is more than three times higher than that in trout, approaching levels found in mammals (∼13 kPa;McDonald, 1974). Some sharks (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…A variation of this method was developed for teleosts (Jones et al, 2005) using the bulbus arteriosus, an elastic chamber that connects the ventricle to the VA (Priede, 1976;Braun et al, 2003a,b). Jones et al (2005) validated their method by showing good accord (R 2 =0.89) between measured blood pressures and predictions from the inflation properties of the bulbi of 10 species.…”

Section: Introductionmentioning

confidence: 99%

Blood pressure in the Greenland shark as estimated from ventral aortic elasticity

Shadwick

Bernal

Bushnell

et al. 2018

Journal of Experimental Biology

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We conducted inflations of freshly excised ventral aortas of the Greenland shark,, and used pressure-diameter data to estimate the point of transition from high to low compliance, which has been shown to occur at the mean blood pressure in other vertebrates including fishes. We also determined the pressure at which the modulus of elasticity of the aorta reached 0.4 MPa, as occurs at the compliance transition in other species. From these analyses, we predict the average ventral aortic blood pressure in to be about 2.3-2.8 kPa, much lower than reported for other sharks. Our results support the idea that this species is slow moving and has a relatively low aerobic metabolism. Histological investigation of the ventral aorta shows that elastic fibres are present in relatively low abundance and loosely connected, consistent with this aorta having high compliance at a relatively low blood pressure.

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DESIGN AND PHYSIOLOGY OF THE HEART | The Outflow Tract from the Heart

Jones¹,

Braun²

2011

Encyclopedia of Fish Physiology

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Necrophysiological determination of blood pressure in fishes

Cited by 6 publications

References 12 publications

Cholecystokinin as a regulator of cardiac function and postprandial gastrointestinal blood flow in rainbow trout (Oncorhynchus mykiss)

Cholecystokinin as a regulator of cardiac function and postprandial gastrointestinal blood flow in rainbow trout (Oncorhynchus mykiss)

Blood pressure in the Greenland shark as estimated from ventral aortic elasticity

DESIGN AND PHYSIOLOGY OF THE HEART | The Outflow Tract from the Heart

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