Catheter-tip flowmeter for coronary arterial flow in closed-chest dogs

1964 ◽  
Vol 19 (6) ◽  
pp. 1199-1201 ◽  
Author(s):  
Heinz P. Pieper
Keyword(s):  
Blood Flow ◽  
Pulsatile Flow ◽  
Left Coronary Artery ◽  
Ascending Aorta ◽  
Arterial Blood Flow ◽  
Performance Tests ◽  
Closed Chest ◽  
Arterial Blood ◽  
Catheter Tip ◽  
The Right

The design of a catheter-tip flowmeter for the measurement of coronary arterial blood flow in closed-chest dogs is presented. The miniaturized flowmeter is attached to the tip of a rigid catheter which is inserted through the right carotid artery. The flowmeter is placed in the ascending aorta where it measures the inflow into the left coronary artery. Performance tests show the reliability of the instrument for the measurement of pulsatile flow. pulsatile flow Submitted on February 3, 1964

Forward blood flow provoked by changing intravascular pressure using an extracorporeal circulation during cardiopulmonary resuscitation

2020 ◽  
Keyword(s):  
Blood Flow ◽  
Cardiopulmonary Resuscitation ◽  
Chest Compression ◽  
Intrathoracic Pressure ◽  
Arterial Blood Flow ◽  
Systemic Blood ◽  
Systemic Blood Flow ◽  
Closed Chest ◽  
Arterial Blood ◽  
Intravascular Pressure

Since both “cardiac pump” and “thoracic pump” theories have been proved during cardiopulmonary resuscitation (CPR), the mechanism of forward blood flow during closed chest compression still remains open to question. The cardiac pump seems to work by the direct compression of the cardiac ventricles between the sternum and vertebral column. A pressure gradient created between the ventricle and aorta generates systemic blood flow. However, the thoracic pump mechanism presumes chest compression causes a rise in intrathoracic pressure which generates a blood flow from the thoracic cavity to the systemic circulation. Retrograde blood flow from the right heart into the systemic veins is prevented by a concomitant collapse of veins at the thoracic inlet. We hypothesize that the intrinsic decrease of vascular resistance from the aorta to peripheral arteries and the existence of competent venous valves enable blood to flow unidirectionally by the fluctuation of intravascular pressures during closed chest compression. The purpose of this study is to prove an antegrade arterial blood flow without cardiac compression and intrathoracic pressure changes in an animal cardiac arrest model. We demonstrate that arterial pulses can be developed by using an extracorporeal circuit, resulting in forward blood flow from the aorta through the systemic vasculature. It can be suggested that changes in intravascular pressure provoked by either cardiac or thoracic pump generate systemic blood flow during closed chest compression, while systemic vascular patency and valve function may be required for successful CPR.

Ocular Findings in Infants Treated With Extracorporeal Membrane Oxygenator Support

PEDIATRICS ◽  
1988 ◽  
Vol 82 (4) ◽  
pp. 560-564
Author(s):  
Martin C. Patrias ◽  
I. Matthew Rabinowicz ◽  
Michael D. Klein
Keyword(s):  
Blood Flow ◽  
Venous Congestion ◽  
Arterial Blood Flow ◽  
Membrane Oxygenator ◽  
Vascular Changes ◽  
Ocular Complications ◽  
Extracorporeal Membrane Oxygenator ◽  
Arterial Blood ◽  
The Right ◽  
Cerebral Venous Congestion

Eleven infants treated with extracorporeal membrane oxygenator support were examined for ocular complications. Four patients were noted to have retinal and external ocular vascular changes on the left but not on the right. These unilateral findings are believed to be related to right common carotid and internal jugular occlusion. The proposed mechanism involves three factors: cerebral venous congestion, impairment of cerebral and possibly retinal arterial autoregulation, and higher cerebral arterial blood flow on the left compared with the right.

Right and left ventricular oxygen metabolism in open-chest dogs

1982 ◽  
Vol 243 (5) ◽  
pp. H761-H766 ◽  
Author(s):  
S. Kusachi ◽  
O. Nishiyama ◽  
K. Yasuhara ◽  
D. Saito ◽  
S. Haraoka ◽  
...  
Keyword(s):  
Blood Flow ◽  
Right Ventricle ◽  
Coronary Sinus ◽  
Left Ventricular ◽  
Arterial Blood Flow ◽  
Arterial Blood ◽  
Open Chest ◽  
O2 Extraction ◽  
Cardiac Veins ◽  
The Right

A comparison of blood flow and myocardial O2 consumption (MVO2) in the right and left ventricles was made in 21 open-chest dogs. Simultaneous measurements were made of left anterior descending (LAD) and right coronary arterial blood flow and of O2 saturation in the coronary sinus and in from one to four anterior cardiac veins. Blood flow was greater in the LAD than in the right coronary artery, 87 +/- 5 vs. 46 +/- 3 ml.min-1.100 g-1. Similarly, the O2 saturation was 51 +/- 3% in the anterior cardiac veins and 40 +/- 1% in the coronary sinus. In a subset of seven dogs, the O2 saturation in blood from anterior cardiac veins varied substantially from vein to vein. The mean MVO2 was greater for the left than for the right ventricle, 8.6 +/- 1.4 vs. 4.0 +/- 0.3 ml O2.min-1,100 g-1. Increases in LAD flow with no increase in O2 extraction accounted for enhanced MVO2 of the left ventricle due to pacing, isoproterenol, or methoxamine. In contrast, pacing, isoproterenol, or constriction of the pulmonary artery increased MVO2 of the right ventricle by both augmented O2 extraction and a rise in right coronary blood flow. We conclude that right coronary arterial blood flow is lower per 100 g tissue and is less dependent on MVO2 than is LAD blood flow. The heterogeneity of O2 saturation in anterior cardiac veins suggests that regional differences in MVO2 may exist.

Differential arterial blood flow response of splanchnic and renal organs during low-intensity cycling exercise in women

2008 ◽  
Vol 294 (5) ◽  
pp. H2322-H2326 ◽  
Author(s):  
Masako Yamaoka Endo ◽  
Rie Suzuki ◽  
Naomi Nagahata ◽  
Naoyuki Hayashi ◽  
Akira Miura ◽  
...  
Keyword(s):  
Blood Flow ◽  
Resistance Index ◽  
Arterial Blood Flow ◽  
Cycling Exercise ◽  
Low Intensity ◽  
Flow Response ◽  
Arterial Blood ◽  
Abdominal Organs ◽  
The Right ◽  
Splenic Vessels

To investigate the regional hemodynamic responses of abdominal arteries at the onset of exercise and to focus on their transient responses, eight female subjects (21–30 yr) performed ergometer cycling exercise at 40 W for 4 min in a semi-supine position. Mean blood velocities (MBVs) in the right renal (RA), superior mesenteric (SMA), and splenic (SA) arteries were measured by pulsed echo-Doppler ultrasonography, with beat-by-beat measurements of heart rate (HR) and mean arterial pressure (MAP). The vascular resistance index (RI) of each artery was calculated from MBV/MAP. MAP (76 ± 9 to 83 ± 8 mmHg at 4 min) and HR (60 ± 7 to 101 ± 9 beats/min at 4 min) increased during exercise ( P < 0.05). The MBV of RA and SA rapidly decreased after the onset of exercise (30 s; −19 ± 5% and −19 ± 12%, respectively), reaching −27 ± 7% and −27 ± 15% at the end of exercise ( P < 0.05). RI did not change during the initial 30 s of exercise, reflecting a reduction in MAP, and increased toward the end of the exercise (+55 ± 21% and +59 ± 39%, respectively). In contrast, both the MBV and RI in the SMA remained constant throughout the exercise. The results indicate that, whereas the responses of renal and splenic vessels changed similarly throughout the protocol, the vascular response of SMA that mainly supplies blood to the intestinal tract was unchanged during exercise. We, therefore, conclude that low-intensity cycling exercise resulted in differential blood flow responses in arteries supplying the abdominal organs.

Modeling Elastic Walls in Lattice Boltzmann Simulations of Arterial Blood Flow

2013 ◽  
Vol 23 (2) ◽  
Author(s):  
Xenia Descovich ◽  
Giuseppe Pontrelli ◽  
Sauro Succi ◽  
Simone Melchionna ◽  
Manfred Bammer
Keyword(s):  
Blood Flow ◽  
Lattice Boltzmann ◽  
Arterial Blood Flow ◽  
Arterial Blood ◽  
Lattice Boltzmann Simulations ◽  
Elastic Walls

scholarly journals Sustained Inflation Reduces Pulmonary Blood Flow during Resuscitation with an Intact Cord

Children ◽  
2021 ◽  
Vol 8 (5) ◽  
pp. 353
Author(s):  
Jayasree Nair ◽  
Lauren Davidson ◽  
Sylvia Gugino ◽  
Carmon Koenigsknecht ◽  
Justin Helman ◽  
...  
Keyword(s):  
Blood Flow ◽  
Perinatal Asphyxia ◽  
Arterial Blood Flow ◽  
Positive Pressure ◽  
Optimal Timing ◽  
Delayed Cord Clamping ◽  
Arterial Blood ◽  
Cord Clamping ◽  
Sustained Inflation ◽  
Near Term

The optimal timing of cord clamping in asphyxia is not known. Our aims were to determine the effect of ventilation (sustained inflation–SI vs. positive pressure ventilation–V) with early (ECC) or delayed cord clamping (DCC) in asphyxiated near-term lambs. We hypothesized that SI with DCC improves gas exchange and hemodynamics in near-term lambs with asphyxial bradycardia. A total of 28 lambs were asphyxiated to a mean blood pressure of 22 mmHg. Lambs were randomized based on the timing of cord clamping (ECC—immediate, DCC—60 s) and mode of initial ventilation into five groups: ECC + V, ECC + SI, DCC, DCC + V and DCC + SI. The magnitude of placental transfusion was assessed using biotinylated RBC. Though an asphyxial bradycardia model, 2–3 lambs in each group were arrested. There was no difference in primary outcomes, the time to reach baseline carotid blood flow (CBF), HR ≥ 100 bpm or MBP ≥ 40 mmHg. SI reduced pulmonary (PBF) and umbilical venous (UV) blood flow without affecting CBF or umbilical arterial blood flow. A significant reduction in PBF with SI persisted for a few minutes after birth. In our model of perinatal asphyxia, an initial SI breath increased airway pressure, and reduced PBF and UV return with an intact cord. Further clinical studies evaluating the timing of cord clamping and ventilation strategy in asphyxiated infants are warranted.

scholarly journals Bicuspid aortic valve morphology and aortic valvular outflow jets: an experimental analysis using an MRI-compatible pulsatile flow circulation system

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kaoru Hattori ◽  
Natsuki Nakama ◽  
Jumpei Takada ◽  
Gohki Nishimura ◽  
Ryo Moriwaki ◽  
...  
Keyword(s):  
Aortic Valve ◽  
Bicuspid Aortic Valve ◽  
Pulsatile Flow ◽  
Aortic Wall ◽  
Ascending Aorta ◽  
Circulation System ◽  
Resonance Imaging ◽  
Left Posterior ◽  
Flow Circulation ◽  
The Right

AbstractThe characteristics of aortic valvular outflow jet affect aortopathy in the bicuspid aortic valve (BAV). This study aimed to elucidate the effects of BAV morphology on the aortic valvular outflow jets. Morphotype-specific valve-devising apparatuses were developed to create aortic valve models. A magnetic resonance imaging-compatible pulsatile flow circulation system was developed to quantify the outflow jet. The eccentricity and circulation values of the peak systolic jet were compared among tricuspid aortic valve (TAV), three asymmetric BAVs, and two symmetric BAVs. The results showed mean aortic flow and leakage did not differ among the five BAVs (six samples, each). Asymmetric BAVs demonstrated the eccentric outflow jets directed to the aortic wall facing the smaller leaflets. In the asymmetric BAV with the smaller leaflet facing the right-anterior, left-posterior, and left-anterior quadrants of the aorta, the outflow jets exclusively impinged on the outer curvature of the ascending aorta, proximal arch, and the supra-valvular aortic wall, respectively. Symmetric BAVs demonstrated mildly eccentric outflow jets that did not impinge on the aortic wall. The circulation values at peak systole increased in asymmetric BAVs. The bicuspid symmetry and the position of smaller leaflet were determinant factors of the characteristics of aortic valvular outflow jet.

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