Cardiac output and peripheral resistance during larval development in the anuran amphibian Xenopus laevis

• DOI: 10.1152/ajpregu.1995.269.5.r1126
• Publication Date: 2017-12-25T04:39:13Z
• Authors: P. C. Hou; W. W. Burggren
• Keywords: Xenopus laevis; 0303 health sciences; 03 medical and health sciences; Larva; Animals; Heart; Stroke Volume; Vascular Resistance; Cardiac Output

Stroke volume (SV) and cardiac output (CO) were measured in anesthetized larvae of Xenopus laevis from hatching (3 mg) to the end metamorphosis (approximately 1 g). CO SV calculated videotaped images intact beating heart. increased 2.4 x 10(-3) microliters at 3 mg body mass 7.6 g. 0.25 microliter/min 623 microliters/min With use CO, along with arterial pressures another study [P.-C. L. Hou W. Burggren. Am. J. Physiol. 269 (Regulatory Integrative Comp. 38): R1120-R1125, 1995], peripheral resistance work also calculated. Resistance decreased rapidly 701 units (PRU, mmHg.s.mm-3) 79 PRU 20 gradually declined toward 0.9 Cardiac 0.06 dyn.mm 1.27 then climbed sharply 717 The general pattern change hemodynamic variables (except heart rate) during larval development is similar chick embryos, suggesting a common for vertebrate embryos/larvae.