scholarly journals A comparison of pulse oximetry and laser Doppler flowmetry in monitoring sequential vascular occlusion in a rabbit ear model

2003 ◽  
Vol 11 (1) ◽  
pp. 11-14 ◽  
Author(s):  
Geoffrey G Hallock ◽  
David C Rice
Keyword(s):  
Pulse Oximetry ◽  
Laser Doppler Flowmetry ◽  
Zealand White Rabbit ◽  
Arterial Occlusion ◽  
Perioperative Period ◽  
Venous Occlusion ◽  
Laser Doppler ◽  
Doppler Flowmetry ◽  
Flap Transfer ◽  
Free Flap Transfer

The ultimate success of any free flap transfer depends not only on the experience of the given surgical team, but also requires constant vigilance in the perioperative period to assure continued anastomotic patency. Clinical acumen remains the ‘industry’ standard, but adjunctive monitoring devices are important to reinforce these subjective evaluations. We routinely use laser Doppler flowmetry in spite of known drawbacks, including expense. On the other hand, we know that pulse oximetry is a possible and readily available alternative. The efficacy of these two monitoring systems was directly compared in a New Zealand white rabbit central artery and vein ear model. Arterial occlusion was immediately recognized by a precipitous drop in flow and oxygen saturation (SaO2). A rapid drop in flow after venous occlusion with a trend to zero was also noted with laser Doppler flowmetry. The SaO2 had a very slow but steady gradual decline, but values remained in the range of normoxemia for a prolonged time. Because a minimum threshold of SaO2 for predicting venous occlusion was elusive, the usefulness of pulse oximetry for monitoring microsurgical composite tissue transfers is limited.

Evaluation of Pulpal Blood Flow Changes in Primary Molars with Physiological Root Resorption by Laser Doppler Flowmetry and Pulse Oximetry

2011 ◽  
Vol 36 (2) ◽  
pp. 139-144 ◽  
Author(s):  
Hüseyin Karayilmaz ◽  
Zuhal Kirzioğlu
Keyword(s):  
Blood Flow ◽  
Pulse Oximetry ◽  
Laser Doppler Flowmetry ◽  
Root Resorption ◽  
Laser Doppler ◽  
Primary Molars ◽  
Primary Molar ◽  
Doppler Flowmetry ◽  
Pulpal Blood Flow ◽  
Significant Difference

Aim: The aim of this study was to undertake a comprehensive quantitative investigation of pulpal blood flow (PBF) changes in human non-carious primary molar teeth with variable degrees of root resorption by Laser Doppler Flowmetry (LDF) and Pulse Oximetry (PO) methods. Materials and Methods: Data was collected from clinically and radiographically healthy 86 mandibular primary molars which have different physiological root resorption levels (PRRLs). PRRLs for each of the teeth were assessed using periapical radiographs and teeth were subdivided into three groups. Results: The LDF values demonstrated a significant difference (p = 0.0001) between all groups although PO did not demonstrate any difference (p = 0.109). Statistical analysis of LDF values demonstrated significant differences between Groups A and C (p = 0.0001) and Groups B and C (p = 0.008). Furthermore, positive correlations were determined between LDF values and PRRL groups (p = 0.0001) and patients' ages (p = 0.0001). Conclusions: In our study, it was observed that the PBF values of human primary molars measured by LDF tended to increase with the progress of physiological root resorption and age. LDF was found to be a more effective method than PO to assess the pulpal vascularity changes of human primary molars.

scholarly journals Venous Small Bowel Infarction: Intraoperative Laser Doppler Flowmetry Discriminates Critical Blood Supply and Spares Bowel Length

2012 ◽  
Vol 2012 ◽  
pp. 1-3 ◽  
Author(s):  
S. A. Käser ◽  
P. M. Glauser ◽  
C. A. Maurer
Keyword(s):  
Small Bowel ◽  
Laser Doppler Flowmetry ◽  
Arterial Occlusion ◽  
Laser Doppler ◽  
Microvascular Blood Flow ◽  
Pathological Examination ◽  
Mesenteric Infarction ◽  
Noninvasive Methods ◽  
Bowel Infarction ◽  
Doppler Flowmetry

Introduction. In mesenteric infarction due to arterial occlusion, laser Doppler flowmetry and spectrometry are known reliable noninvasive methods for measuring microvascular blood flow and oxygen utilisation.Case Presentation. As an innovation we used these methods in a patient with acute extensive mesenteric infarction due to venous occlusion, occurring after radical right hemicolectomy. Aiming to avoid short bowel syndrome, we spared additional 110 cm of small bowel, instead of leaving only 80 centimetres of clinically viable small bowel in situ. The pathological examination showed only 5 mm of vital mucosa to be left distal to the dissection margin. No further interventions were necessary.Conclusion. Laser doppler flowmetry and spectrometry are potentially powerful methods to assist the surgeon’s decision-making in critical venous mesenteric perfusion, thus having an important impact on clinical outcome.

scholarly journals Laser Doppler Flowmetry to Differentiate Arterial From Venous Occlusion in Free Tissue Transfer

2019 ◽  
Vol 27 (4) ◽  
pp. 297-304
Author(s):  
Emre Gazyakan ◽  
Huang-Kai Kao ◽  
Ming-Huei Cheng ◽  
Holger Engel
Keyword(s):  
Blood Flow ◽  
Laser Doppler Flowmetry ◽  
Free Tissue Transfer ◽  
Venous Occlusion ◽  
Laser Doppler ◽  
Arterial Blood Flow ◽  
Probe Laser ◽  
Doppler Flowmetry ◽  
Arterial Blood ◽  
Tissue Transfer

Purpose: The differentiation of arterial versus venous occlusion in free tissue transfers has rarely been described. This study investigated changes in blood flow caused by arterial and venous occlusion and the potential for laser Doppler flowmetry to distinguish between these 2 conditions for better clinical assessment and management of free tissue transfer. Methods: Six patients with a mean age of 43.5 years underwent microsurgical free tissue transfer. The venous and arterial blood flow of the vessels and skin flap were monitored using laser Doppler flowmetry with high-frequency pulsed Doppler transducers for vessels and skin before, during, and after clamping the vessels for 10 minutes. Results: The average decreases in blood flow in the artery and vein caused by clamping were 94.4% and 93.8%, respectively. On average, arterial occlusion demonstrated a sudden drop of 67.7% and venous occlusion caused a decrease of 26.6% on laser Doppler flowmetry in free tissue skin. Conclusion: Using a vessel-holding probe, laser Doppler flowmetry could be used to differentiate between arterial and venous occlusion in free tissue transfer, thereby aiding decision-making for better clinical management.

The response of skin perfusion and of rheological and immunological variables to intravenous prostanoid administration in Raynaud’s phenomenon secondary to collagenosis

VASA ◽  
2005 ◽  
Vol 34 (4) ◽  
pp. 243-249 ◽  
Author(s):  
Drinda ◽  
Neumann ◽  
Pöhlmann ◽  
Vogelsang ◽  
Stein ◽  
...  
Keyword(s):  
Laser Doppler Flowmetry ◽  
Raynaud’S Phenomenon ◽  
Raynaud's Phenomenon ◽  
Plasma Viscosity ◽  
Laser Doppler ◽  
Erythrocyte Aggregation ◽  
Control Group ◽  
Long Term Effects ◽  
Doppler Flowmetry

Background: Prostanoids are used in the treatment of Raynaud’s phenomenon and acral perfusion disorders secondary to collagenosis. In subjective terms, intravenous administration of these agents produces success in more than 50% of patients. The therapeutic outcome of clinical administration of alprostadil or iloprost may vary from individual to individual. Patients and methods: The following variables were analysed in a cross-over study in 27 patients with collagenosis and Raynaud’s phenomenon: plasma viscosity and erythrocyte aggregation (rheological variables), partial pressure of oxygen and laser Doppler flowmetry in the finger region, and lymphocyte phenotyping and interleukin (IL) determinations (immunological variables). Results: Laser Doppler flowmetry revealed significant differences between patients with secondary Raynaud’s phenomenon and a control group of 25 healthy subjects. Laser Doppler readings did not change significantly as a result of the treatments. Therapy with iloprost produced a reduction in IL-1beta, L-selectin (CD 62 L) and IL-6. Conclusion: The change in immunological variables due to iloprost may explain the long-term effects of prostaglandins in the treatment of Raynaud’s phenomenon. From our results it is not possible to infer any preference for iloprost or alprostadil.

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