Blue light therapy in the management of chronic wounds: a narrative review of its physiological basis and clinical evidence.

INTRODUCTION: Chronic wounds are a significant problem worldwide, with substantial cost to health care systems; thus, a minimally invasive and well-tolerated treatment is attractive. Blue light has shown promise in wound healing through the principle of photobiomodulation. OBJECTIVE: This review examines the physiological effects of blue light on tissue and the hypothesis that appropriate application of blue light in conjunction with SOC improves wound healing compared with SOC alone. METHODS: The authors searched in PubMed, Google Scholar, and the Cochrane Library to identify literature on the mechanism of action of blue light and then examined the clinical evidence. RESULTS: Key physiological pathways of blue light include generation of ROS and nitric oxide, resulting in promotion of angiogenesis, reduced inflammation, and direct antimicrobial effects. These reactions are seen only at low doses; in fact, higher doses may be harmful to tissue. The only primary study with statistical analyses demonstrated wound area reduction of 51% (P =.007) in blue light-irradiated wounds compared with SOC alone. CONCLUSIONS: Blue light applied following a strict protocol is safe and shows promise in the management of chronic wounds. The current evidence is poor, however, and randomized trials are required to confirm its clinical utility.

Transesophageal Echocardiography-Guided Cardiopulmonary Resuscitation After Rocuronium Anaphylaxis.

Anaphylaxis is a life-threatening hypersensitivity reaction that can quickly progress to circulatory collapse, even in the presence of timely epinephrine administration. This report describes a case of rocuronium anaphylaxis which progressed to circulatory arrest despite intravenous epinephrine and crystalloid resuscitation. Transesophageal echocardiography performed during cardiopulmonary resuscitation enabled rapid identification of the cause of shock and redirected management to prioritize further fluid administration, leading to return of spontaneous circulation with a good outcome. The etiology of shock in anaphylaxis can be variable, and transesophageal echocardiography can rapidly identify the likely mechanism and guide treatment without interrupting ongoing resuscitative efforts.

Threatened limb from stingray injury.

We present the case of a 43-year-old female who suffered a stingray injury to her left ankle. The sting caused occlusion of the dorsalis pedis artery, causing dry gangrene of the medial forefoot. A below knee amputation was recommended but she was transferred for a second opinion. A Prostaglandin E1 infusion was commenced, resulting in alleviation of pain and improvement in perfusion. Amputation of great and second toes was performed, with the head of the first metatarsal preserved and covered via a cross-over skin flap raised from the contralateral leg. Achilles tendon lengthening was then performed to return the foot to a functional position. This case serves to highlight the utility of prostaglandin infusion, and the requirement for a multidisciplinary approach to critical limb ischemia in order to avoid major amputation.

The conundrum of claudication.

Stable claudication has traditionally been treated conservatively by many clinicians as operative therapies involve considerable risk for a condition that is often slowly progressive and non-fatal. The relative safety of less invasive endovascular techniques brings potential survival benefits from the increased exercise tolerance that result. We aimed to revisit and clarify the aetiologies of intermittent claudication in a review of the rarer causes that can mimic atherosclerotic occlusive disease. An extensive search of Medline, Embase and the Cochrane databases was carried out to compile published work addressing the aetiology of claudication and specific non-atherosclerotic causes. The reference lists of these manuscripts were also searched for relevant articles. There are several vasculogenic and neurogenic causes for intermittent claudication, many of which are unrelated to atherosclerosis. Recognition of these rarer syndromes is essential when planning endovascular or operative management strategies. Consideration of non-atherosclerotic differential diagnoses is recommended when assessing the patient with intermittent claudication. This is particularly critical in the young patient whose pattern of symptoms and risk factors may not fit precisely with atherosclerosis.