Phasic aortic flow velocity in patients with pulsus alternans

Benchimol, Alberto; Barreto, Egeu C.; Tio, Stephen

doi:10.1136/hrt.32.5.696

Cited by 13 publications

(3 citation statements)

References 10 publications

(1 reference statement)

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“…17 The carotid artery flow velocity alternans seen here was probably based on alternation of left ventricular enddiastolic fiber length 18 and contractility 19 during tachycardia. Of interest was a five to ten beat low peak flow velocity "warming-up phase" prior to the onset of alternation.…”

Section: Carotid Artery Blood Flow Velocity Alternationmentioning

confidence: 95%

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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Section: Carotid Artery Blood Flow Velocity Alternationmentioning

confidence: 95%

The Effects of Ventricular Tachycardia on Carotid Artery Blood Flow Velocity

Benchimol

Baldi

Desser

1974

Stroke

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“…However, pulsus alternans has also been observed in patients with cardiomyopathies of a variety of etiologies, including hypertrophic cardiomyopathy.6i1 Although pulsus alternans is attributed to a rhythmic alternation in stroke volume ejected by the left ventricle, the mechanism of this phenomenon has been controversial. [11][12][13][14][15][16][17] Several studies in animals and humans suggest an alternating contractile state of the myocardium between strong and From the Cardiovascular Diagnosis Section, Cardiology Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD.…”

mentioning

confidence: 99%

Left ventricular pulsus alternans in patients with hypertrophic cardiomyopathy and severe obstruction to left ventricular outflow.

Cannon¹,

Schenke²,

Bonow³

et al. 1986

Circulation

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276-285, 1986. FOR OVER 100 years pulsus alternans, characterized clinically by alternating strong and weak beats on palpation of peripheral pulses, has been considered a sign of myocardial disease.' Pulsus alternans most commonly occurs in the setting of increased afterload, such as aortic stenosis2' and hypertension,4'5 especially in the setting of myocardial failure. However, pulsus alternans has also been observed in patients with cardiomyopathies of a variety of etiologies, including hypertrophic cardiomyopathy.6i1 Although pulsus alternans is attributed to a rhythmic alternation in stroke volume ejected by the left ventricle, the mechanism of this phenomenon has been controversial. [11][12][13][14][15][16][17] Several studies in animals and humans suggest an alternating contractile state of the myocardium between strong and

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“…Franklin, Schlegel, and Rushmer (i96i), Rushmer,Baker,and Stegall (I966), and Reid, Sigelman, and Nasser (1969) have also developed Doppler flowmeters. This technique has come to be widely used in the clinical field (Miyazaki, I965;Strandness, McCutcheon, and Rushmer, I966;Strandness et al, I967;Benchimol et al, I968;Yao, Hobbs, and Irvine, 1968; Evans and Cockett, I969;Balas, Segditsas, and Koutsopoulos, 1970;Benchimol, Barreto, and Teng Wei Tio, 1970;Joyner, Harrison, and Gruber, I971;Benchimol and Desser, 1972). goo Nimura, Matsuo, Hayashi, Kitabatake, Mochizuki, Sakakibara, Kato, and Abe Satomura's Doppler technique could reveal the flow velocity; that is, the magnitude of velocity, but not the direction.…”

mentioning

confidence: 99%

Studies on arterial flow patients - instantaneous velocity spectrums and their phasic changes - with directional ultrasonic Doppler technique.

Nimura¹,

Matsuo²,

Hayashi³

et al. 1974

Heart

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Flow velocity spectra of main arteries in 24 healthy adult subjects and 21 healthy aged subjects were transcutaneously studied using the directional ultrasonic Doppler technique.I) The instantaneous flow velocity spectrum is continuous throughout a pulse cycle, and intensified near the instantaneous maximum velocity, especially in the earlypart ofa pulse cycle.2) No reverse flow phase is observed in the common carotid artery except for a small momentary reverse component. A reverse flow phase is always exhibited in the femoral artery and in many occasions in the other main arteries; it follows the systolic forward flow phase. After the reverse flow phase the diastolic forward flow phase appears. In some subjects a second reverse flow phase and thirdforwardflow phase are successively observed.3) The arterial bloodflow almost looks like a propagation ofa damped longitudinal oscillation. 4) At the time of conversion between the forwardflow phase and the reverse flow phase, both forward and reverse components simultaneously coexist in a cross-section of the vessel.5) The arterialflow pattern is easily changeable in the arteries of the extremities, especially in the brachial artery. Such an easy changeability is the essentialfeature of the arterial bloodflow.6) The propagation velocity of the flow velocity wave is more rapid in elderly subjects than in other adult subjects. The reverse flow phase of the arterial flow pattern in the extrermties is more often observed in elderly subjects than in adult subjects. In the common carotid artery of elderly subjects the peak velocity is reduced so that the systolic rapidforward phase looks like a plateau.Studies on the mode of flow in the blood vessels should give us much information on the condition of the cardiovascular system. The ultrasonic Doppler technique offers a useful transcutaneous approach to this study. The technique was originally proposed by Satomura, Matsubara, and Yoshioka (1956) for the physical measurement of minor vibrations. It was also revealed that Doppler beats occurred from the blood flow in the blood vessels (Satomura, 1959; Satomura and Kaneko, I960).One of the present authors and others (Kato et al., I962) showed that Doppler beats due to the blood

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Phasic aortic flow velocity in patients with pulsus alternans

Cited by 13 publications

References 10 publications

The Effects of Ventricular Tachycardia on Carotid Artery Blood Flow Velocity

The Effects of Ventricular Tachycardia on Carotid Artery Blood Flow Velocity

Left ventricular pulsus alternans in patients with hypertrophic cardiomyopathy and severe obstruction to left ventricular outflow.

Studies on arterial flow patients - instantaneous velocity spectrums and their phasic changes - with directional ultrasonic Doppler technique.

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