Near infra-red spectroscopy: a non-invasive monitor of perfusion and oxygenation within the microcirculation of limbs and flaps.
Research article published in British journal of plastic surgery (1995)
Abstract
Reliable early detection of adverse circulatory changes within a flap following free tissue transfer and early re-exploration are vital to minimise flap failure. Most surgeons rely on clinical assessment to monitor these changes but techniques such as plethysmography and laser Doppler have their advocates. These methods are limited however to measuring changes close to the surface. Near infra-red spectroscopy (NIRS) is a relatively new, non-invasive technique which allows continuous monitoring of concentration changes in oxy-, deoxy- and total haemoglobin (HbO2, Hb and HbT), as well as oxidised cytochrome aa3, through tissue up to 10 cm in depth. Information is provided on tissue oxygen supply, cellular oxygen utilisation, blood volume and perfusion status. A study has been performed in 10 rabbit hind limbs to assess the ability of NIRS to detect and distinguish between venous, arterial and total vascular occlusion. Clear patterns of change have been identified which allow rapid detection of vascular occlusion with accurate prediction of site. Arterial occlusions were characterised by an increase in Hb with a corresponding decrease in HbO2 and HbT. Venous occlusions resulted in an increase in HbT with relatively minor fluctuations in Hb and HbO2. Simultaneous occlusion of both artery and vein produced similar changes to those of arterial occlusion except that HbT decreased only minimally. These findings suggest that NIRS has a potentially useful role in the monitoring of free flaps, with the great advantage that perfusion can be measured to a considerable depth and information provided on the oxygenation profiles both accurately and non-invasively.
Abstract sourced from PubMed (NCBI) for the cited record. See the original publication for the authoritative version.
Резюме
Reliable early detection of adverse circulatory changes within a flap following free tissue transfer and early re-exploration are vital to minimise flap failure. Most surgeons rely on clinical assessment to monitor these changes but techniques such as plethysmography and laser Doppler have their advocates.
Почему это важно для гирудотерапии
Данное исследование оценило ближнюю инфракрасную спектроскопию (NIRS) в качестве неинвазивного монитора перфузии и оксигенации в 10 задних конечностях кроликов, сообщив о различных паттернах для артериальной окклюзии (повышение дезоксигемоглобина со снижением оксигемоглобина и общего гемоглобина) и венозной окклюзии (повышение общего гемоглобина), при этом мониторинг возможен через ткани толщиной до 10 см. В аннотации указывается, что NIRS может помочь в мониторинге свободных лоскутов и выявлении сосудистой окклюзии после переноса тканей. Однако это исследование на животных, посвящённое технологии мониторинга, в котором не упоминаются пиявки, гирудотерапия или секретом пиявок. Таким образом, оно не предоставляет прямых доказательств в пользу пиявочной терапии, и никакая связь с гирудотерапией в аннотации не обоснована.
Цитирование
Near infra-red spectroscopy: a non-invasive monitor of perfusion and oxygenation within the microcirculation of limbs and flaps.
Irwin et al. · British journal of plastic surgery, 1995
Связанный клинический контекст
Узнайте, как это исследование связано с клинической практикой
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