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

Samnegård, Hans; Ekeström, S

doi:10.3109/14017437409130739

Cited by 8 publications

(2 citation statements)

References 16 publications

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“…Internal carotid artery mean blood flow (QIcA), mllmin, was measured according to a method described by SamnegLrd & Ekestrom (1973). An electromagnetic flow probe was implanted on the ICA after arterial reconstruction.…”

Section: Methodsmentioning

confidence: 99%

Effect of Physical Exercise on Internal Carotid Artery Blood Flow after Arterial Reconstruction

Samnegård

Carlens

1975

Scandinavian Journal of Thoracic and Cardiovascular Surgery

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The effect of physical exercise on internal carotid artery (ICA) blood flow in conscious man was studied with the aid of electromagnetic flowmetry. A flow probe was implanted on the ICA in 25 patients after reconstruction of the artery. ICA mean blood flow and brachial artery mean blood pressure were continuously monitored in supine (25 patients) and sitting (24 patients) position at rest, during 5-6 minutes exercise on a bicycle ergometer and at rest after exercise. Arterial carbon dioxide tension (PaCO2) was studied in 6/25 work tests in supine and 7/24 in sitting position. Cardiac output was measured at rest and during exercise in 10/25 patients in supine and 8/24 patients in sitting position. In the supine group, ICA flow increased significantly within 1 minute and reached a maximal flow 15% above control flow within 2 minutes after the onset of exercise. The ICA flow then gradually declined, but remained almost significantly elevated, 7.5% above control, on termination of exercise. At rest, after exercise, the ICA flow decreased almost significantly to a level of 5% below the control flow within 5 minutes. There was a significant PaCO2 increase of 2.6 mmHg during exercise and a highly significant increase (72%) in cardiac output during exercise. The ICA flow at rest, before exercise, was about 15% lower in the sitting group than in the supine group. It increased in average 11.5% with 2 minutes of exercise and then gradually diminished. At rest, after exercise, ICA flow decreased further to a level of 8% below control flow within 5 minutes. PaCO2 increased significantly in average 1.6 mmHg during exercise. Cardiac output increased highly significantly (85%) during exercise. The ICA flow changes obtained during exercise in the present study indicate the presence of a regulatory mechanism counteracting the increasing perfusion pressure, but it is unable to compensate the decreased perfusion pressure when the body position was altered from supine to sitting. The cerebral vascular bed in the present patient material seems to operate above and below the lower limit of its pressure range for an adequate autoregulation.

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Section: Methodsmentioning

confidence: 99%

Effect of Physical Exercise on Internal Carotid Artery Blood Flow after Arterial Reconstruction

Samnegård

Carlens

1975

Scandinavian Journal of Thoracic and Cardiovascular Surgery

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“…In an earlier study by Samnegsrd & Ekestrom (1973), amethod waspresentedforleavinganimplantable electromagnetic flow probe in situ on the ICA in the postoperative period. The purpose of this communication is to report the effect of changed arterial carbon dioxide tension (PaCO,) on the ICA flow in conscious patients operated upon a few days earlier for obstructive disease of the ICA.…”

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confidence: 99%

Influence of Hypo- and Hypercapnia on Internal Carotid Artery Blood Flow after Arterial Reconstruction

Samnegård¹,

Carlens²

1974

Scandinavian Journal of Thoracic and Cardiovascular Surgery

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The influence of arterial PaCO, on internal carotid artery (ICA) blood flow was studied with the aid of an electromagnetic flow probe implanted on the ICA after arterial reconstruction in 13 patients. ICA flow (QIcA) varied as a single exponential function of PaCO, according to the least squares equation adjusted to the observations: log QICA= 1.784f0.013 PaCO,, S.D.kO.104, n=46, r=0.85.This relationship is similar to that reported in the literature for that between cerebral blood flow (CBF) and PaCO,, a fact which is considered to indicate that changes in ICA flow reflects changes in CBF through the tissue supplied by the ICA studied. The cerebral vasoreactivity to CO, seems to be well preserved in arteriosclerotic, conscious patients, operated upon a few days earlier with internal carotid artery reconstruction.

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Risks With Arterial Flow Probes

Samnegård¹

1974

JAMA

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

Cited by 8 publications

References 16 publications

Effect of Physical Exercise on Internal Carotid Artery Blood Flow after Arterial Reconstruction

Effect of Physical Exercise on Internal Carotid Artery Blood Flow after Arterial Reconstruction

Influence of Hypo- and Hypercapnia on Internal Carotid Artery Blood Flow after Arterial Reconstruction

Risks With Arterial Flow Probes

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