Measurement of the blood-pressure constantk, over a pressure range in the canine radial artery

Voelz, M.

doi:10.1007/bf02442765

Cited by 16 publications

(8 citation statements)

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“…No increase due to the beta-blockers was observed compared with the placebo. Also, the mean arterial pressure used for the calculation of peripheral resistance, may in many cases be false; as Voelz (1981) showed, it cannot be obtained accurately using the systolic and diastolic pressure readings.…”

Section: Discussionmentioning

confidence: 99%

Effect of long‐term beta‐adrenergic‐blockade on calf blood flow in hypertensive patients

Lepäntalo¹,

Tötterman

1983

Clinical Physiology

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The effect of a four-week treatment with propranolol and metoprolol on blood pressure and regional haemodynamics of the lower extremity at rest, after exercise and during reactive hyperaemia was studied in 34 patients with essential hypertension, but without peripheral arterial disease, in a randomized placebo-controlled trial. No significant difference in side-effects recorded during the trial was observed between these two drugs. Treatment with beta-adrenergic blocking drugs reduced systemic blood pressure. Calf blood flow during vasodilatation was also decreased. The most marked changes were observed during reactive hyperaemia; mean calf blood flow was reduced from about 250 ml/min/litre of tissue to 200 ml/min/litre of tissue (P less than 0.01) by propranolol and to 214 ml/min/litre of tissue (P less than 0.01) by metoprolol. Both drugs caused a significant increase in peripheral resistance above the initial level during reactive hyperaemia (P less than 0.05). No significant difference in peripheral resistance was observed, however, when the active drugs were compared with the placebo. There was no difference between propranolol and metoprolol in any of the parameters. Thus, the flow reduction can mainly be attributed to the diminished perfusion pressure due to the decreased cardiac output caused by beta-blockade of the heart.

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Section: Discussionmentioning

confidence: 99%

Effect of long‐term beta‐adrenergic‐blockade on calf blood flow in hypertensive patients

Lepäntalo¹,

Tötterman

1983

Clinical Physiology

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“…Then manual correction was implemented after that. The parameter 𝐾 value is defined as follows [11]. The coordinate values of 𝑄 𝑎 and 𝑄 𝑂 are (𝑇 𝑎 , 𝑃 𝑎 ) and (𝑇 𝑜 , 𝑃 𝑜 ) respectively.…”

Section: Methodsmentioning

confidence: 99%

Effect of Oxygen Concentration Reduction on Photoplethysmographic Waveform Characteristics

Li¹,

Li²,

Cao³

et al. 2022

Computing in Cardiology Conference (CinC)

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This paper aims to find out the difference of human photoplehysmography (PPG) morphological parameter 𝐾 between in normal oxygen concentration regions and in low oxygen level environments. We implemented an experiment with a normobaric hypoxic chamber which generalized low oxygen level environment of 13.4% (equivalent to the altitude of 3600 m). The experiment contained two sections-10 minutes short exposure and a night of sleep. Fingertip PPG signal was recorded in the whole process. We carried out a comparative analysis for each subject in normal and hypoxic conditions. Result showed that the average 𝐾 values in normoxic environment and hypoxic conditions for short exposure were 0.3456 and 0.3861 respectively, and for sleep were 0.3081 and 0.3419 respectively. Significance level p were both less than 0.05. Variations of PPG waveform parameter 𝐾 reflect the changed peripheral vascular resistance. In hypoxic environment, the raised 𝐾 value tallied with the physiological mechanism that hypoxic exposure increases peripheral vascular resistance. And this phenomenon happened since the beginning of hypoxia and could last for at least a night.

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“…由公式 (30) 可知, 中心动脉血压波形受中心动脉 -桡动脉传递函数影响. 由 Chen [22] 的研究可知, 脉搏波的功率谱密度主要集中分布在 0∼5 Hz 范围内, 又因为图 7 中脉搏波周期约为 0.6∼0.7 s (频率为 1.7∼1.4 Hz), 因此可以近似认为中心动脉血压的收缩压、舒张压和脉压差主要由传递函数 0∼2 Hz [23,24] . 罗志昌 [25] 等人通过动物实验、临床试验和数学模型计算得到如下结论: 随着患者年龄增大, 血管顺应性变差, 血液粘度提高, 血管阻力升高, 脉搏波波形中的反射波与主波融合, 主波变宽大, K 值升高.…”

Section: 人体动脉血管网络模型unclassified

人体动脉血管的粘性流体力学模型与中心动脉血压估计

Jiang

Wang

et al. 2013

Sci. Sin.-Inf.

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Measurement of the blood-pressure constantk, over a pressure range in the canine radial artery

Cited by 16 publications

References 1 publication

Effect of long‐term beta‐adrenergic‐blockade on calf blood flow in hypertensive patients

Effect of long‐term beta‐adrenergic‐blockade on calf blood flow in hypertensive patients

Effect of Oxygen Concentration Reduction on Photoplethysmographic Waveform Characteristics

人体动脉血管的粘性流体力学模型与中心动脉血压估计

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