Measurement of phasic carotid artery flow velocity in man

Benchimol, Alberto; Barreto, Egeu C.; Goldstein, Marvin R.; Gartlan, John L.

doi:10.1016/s0002-9343(70)80072-9

Cited by 23 publications

(7 citation statements)

References 20 publications

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“…These findings correspond well with the studies of the phasic carotid artery flow velocity made by Benchimol et al (1970). With the pronounced flow decrease during one single VES, it is easy to understand the appearance of cerebral ischaemic symptoms during ventricular tachycardia.…”

Section: Scand J Thor Cardiovasc Surgsupporting

confidence: 88%

Continuous Per- and Postoperative Blood Flow Measurements on the Internal Carotid Artery after Arterial Reconstruction

Samnegård

Ekeström

1974

Scandinavian Journal of Thoracic and Cardiovascular Surgery

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Abstracr.A method is presented for continuous per-and postoperative blood flow measurements, with the aid of an implantable electromagnetic flow probe, on the internal carotid artery after arterial reconstruction. A flow probe was irnplanted on 39 arteries. The internal carotid artery flow increased significantly, by 67 % above the peroperative flow on the first postoperative day and then gradually declined. Postoperative hyperaemia may indicate a temporarily impaired autoregulation of the cerebral blood flow after brief internal carotid artery occlusions during the reconstruction. Some different flow patterns, due to different cardiac rhythms and respiration, are described and briefly discussed. The method proved safe and valuable for studying flow changes in the internal carotid artery, particularly for repeated flow measurements and during non-steady-state situations.

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Section: Scand J Thor Cardiovasc Surgsupporting

confidence: 88%

Continuous Per- and Postoperative Blood Flow Measurements on the Internal Carotid Artery after Arterial Reconstruction

Samnegård

Ekeström

1974

Scandinavian Journal of Thoracic and Cardiovascular Surgery

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“…1 ' 6 In an earlier report which characterized phasic carotid artery blood flow velocity, we noted that in a few patients, supraventricular and ventricular tachycardias diminished the amplitude of blood velocity wave-forms. 6 We report here in detail the abnormalities of carotid artery flow velocity noted in human subjects during catheter and pacemaker-induced ventricular tachycardias.…”

Section: The Effects Of Ventricular Tachycardia On Carotid Artery Blomentioning

confidence: 91%

“…8 The method for obtaining such carotid artery blood flow velocity signals by radiotelemetry has been previously described in detail. 6 The Doppler ultrasonic method of measuring blood flow velocity has been applied to more than 1,000 subjects in the past four years in order to study coronary, 9 renal, 10 superior mesenteric, 11 and aortic blood flow velocity 12 under a variety of clinical and experimental conditions. Right carotid artery flow velocity, lead II of the electrocardiogram, tricuspid area phonocardiograms and at times apexcardiograms, external carotid pulse tracings and right atrial or ventricular pressures were recorded simultaneously.…”

Section: Methodsmentioning

confidence: 99%

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The Effects of Ventricular Tachycardia on Carotid Artery Blood Flow Velocity

Benchimol

Baldi

Desser

1974

Stroke

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Abstract:The Effects of Ventricular Tachycardia on Carotid Artery Blood Flow Velocity• Utilizing the Doppler flowmeter catheter, right carotid blood velocity was measured during episodes of catheter-evoked and pacemaker-induced ventricular tachycardias. Such tachyarrhythmias uniformly diminished peak carotid blood velocity, which in the case of catheter-evoked episodes reduced phasic blood velocity by 50%. At driving rates greater than 140 per minute, the average peak carotid blood velocity was 25% to 50% lower during ventricular when compared with atrial pacing. There was a direct correlation between the ventricular pacing rates and the percent decline of peak carotid blood velocity. Such arrhythmiarelated carotid blood velocity deficits may account for syncopal episodes in subjects so affected.

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“…6 ' 7 Under local anesthesia (1% lidocaine), the crystal-tipped catheter was introduced into a brachial arterial incision and advanced to the origin of the right carotid artery. In addition, a standard fluid-filled catheter connected to a Statham P23Db strain gauge was advanced from a medial antecubital vein to the right heart for the purpose of obtaining right atrial pressures.…”

Section: Methodsmentioning

confidence: 99%

Carotid blood velocity during cough studies in man.

Desser¹,

Harris²,

Benchimol³

1976

Stroke

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SUMMARY Utilizing a Doppler ultrasonic flownteter catheter, right carotid artery blood velocity was measured during 91 coughing episodes in 16 patients. Such coughing reduced carotid blood velocity by 40 ± 22% (control = 34 ± 8 cm per second, cough = 20 ± 9 cm per second, p < 0.001). There was an insignificant low degree of correlation between the level of simultaneously recorded mean right pressure and the percent decline of peak carotid blood velocity, suggesting that impaired venous return was not the only factor responsible for the observed changes. It is concluded that (1) coughing diminishes phasic carotid blood velocity and (2) reduced cerebral perfusion may play a role in the pathogenesis of cough syncope.COUGH SYNCOPE is a well-recognized clinical entity which has intrigued clinicians for approximately 100 years. Previous studies have documented the influence of tussive episodes on intrathoracic, cardiovascular or cerebrospinal fluid pressures 1 " 4 and changes in fluoroscopic images of the right atrium, vena cava and pulmonary vein. 5 In addition, EEG monitoring has been performed during the act of coughing. 3 We report here the influence of cough on phasic carotid arterial blood velocity. MethodsSixteen patients comprised the study group; there were 12 men and four women whose ages ranged from 23 to 58 with a mean of 44 years. Eight subjects had normal cardiovascular function and seven had coronary artery disease. One patient had mitral stenosis. No subject had symptoms suggestive of cough syncope. All diagnoses were established on the basis of right and left heart catheterization, indicator dilution curves and selective coronary cineangiography. Normal subjects were studied because of the presence of chest pain or systolic murmurs originally thought to represent heart disease. Patients were studied in a supine position in the postabsorptive state.Phasic instantaneous right carotid artery blood velocity was measured with a Doppler ultrasonic flowmeter catheter as previously described.6 ' 7 Under local anesthesia (1% lidocaine), the crystal-tipped catheter was introduced into a brachial arterial incision and advanced to the origin of the right carotid artery. In addition, a standard fluid-filled catheter connected to a Statham P23Db strain gauge was advanced from a medial antecubital vein to the right heart for the purpose of obtaining right atrial pressures. All subjects were instructed to cough in varying degrees while phasic carotid artery blood velocity, mean right atrial pressure and lead II of the ECG were recorded. Catheter tip position and stability were monitored by means of constant fluoroscopic image intensification. In six subjects, phasic aortic blood velocity also was recorded during cough.The Doppler catheter utilized in this study measured the velocity of blood cells flowing past its tip and reflected volumetric flow only as a function of stable arterial lumen diameter. ResultsNinety-one coughing episodes in the study group reduced peak carotid artery blood velocity by an average of 40 ...

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Measurement of phasic carotid artery flow velocity in man

Cited by 23 publications

References 20 publications

Continuous Per- and Postoperative Blood Flow Measurements on the Internal Carotid Artery after Arterial Reconstruction

Continuous Per- and Postoperative Blood Flow Measurements on the Internal Carotid Artery after Arterial Reconstruction

The Effects of Ventricular Tachycardia on Carotid Artery Blood Flow Velocity

Carotid blood velocity during cough studies in man.

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