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Related Concept Videos

Hypoxia01:23

Hypoxia

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Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
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Treatment for Pulmonary Arterial Hypertension: Oxygen Therapy for Respiratory Failure01:16

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Oxygen therapy has emerged as a significant tool in enhancing the quality of life for patients suffering from pulmonary arterial hypertension (PAH). While this therapy has principally been studied on patients with significant hypoxemia, this therapeutic approach helps prevent potential organ damage and can be administered in the comfort of one's home.
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Oxygen Transport in the Blood01:27

Oxygen Transport in the Blood

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Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...
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Hemoglobin01:24

Hemoglobin

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Hemoglobin is a globular protein made up of four subunits. Two of these subunits are alpha chains, and the other two are beta chains. Each subunit contains a molecule of heme, which has an iron atom and can bind to oxygen. When an oxygen molecule binds to one heme group, it changes the shape of hemoglobin, making it easier for the other heme groups to bind oxygen as well.
When all four heme groups are bound to oxygen, the resulting molecule is called oxyhemoglobin. As a result, arterial blood...
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Hypoglycemia and Glucagon01:15

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Without prolonged fasting, healthy individuals maintain blood glucose levels above 3.5 mM due to a well-adapted neuroendocrine counterregulatory system that effectively prevents acute hypoglycemia, a potentially life-threatening condition. The primary clinical scenarios for hypoglycemia encompass diabetes treatment, inappropriate production of endogenous insulin or insulin-like substances by tumors, and the use of glucose-lowering agents in non-diabetic individuals. Notably, hypoglycemia in the...
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SBAR II: Application of SBAR01:14

SBAR II: Application of SBAR

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SBAR is an effective communication tool used by healthcare professionals to communicate patient information accurately. SBAR stands for Situation, Background, Assessment, and Recommendation. For a better understanding, an example is given below.
SBAR Report from a Nurse to a Health Care Provider
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Related Experiment Video

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Author Spotlight: Enhancing Vascular Function and Physical Capacity in Cardiovascular Disease Through Novel Interventions and NIRS Technology
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Author Spotlight: Enhancing Vascular Function and Physical Capacity in Cardiovascular Disease Through Novel Interventions and NIRS Technology

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Glycosylated hemoglobin and hyperbaric oxygen coverage denials.

A D Moffat, E R Worth, L K Weaver

    Undersea & Hyperbaric Medicine : Journal of the Undersea and Hyperbaric Medical Society, Inc
    |July 9, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Denying hyperbaric oxygen therapy for diabetic foot ulcers based on HbA1c levels above 7.0% is not supported by evidence. Clinical trials show wounds heal even with high glycosylated hemoglobin, indicating this denial is unfounded.

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    Area of Science:

    • Hyperbaric Medicine
    • Diabetology
    • Wound Healing Research

    Background:

    • Some insurance providers deny hyperbaric oxygen (HBO2) therapy for diabetic foot ulcers (DFU) if glycosylated hemoglobin (HbA1c) exceeds 7.0%.
    • This practice lacks robust scientific justification and impacts patient access to potentially beneficial treatments.

    Purpose of the Study:

    • To evaluate the scientific evidence linking HbA1c levels to wound healing outcomes in diabetic patients undergoing treatment.
    • To determine if elevated HbA1c levels are a valid contraindication for hyperbaric oxygen therapy in DFU management.

    Main Methods:

    • A comprehensive literature search was conducted on PubMed for clinical trials on diabetic wound healing that reported HbA1c levels and wound healing endpoints.
    • Thirty peer-reviewed clinical trials, involving over 4,400 patients, were scrutinized for data on HbA1c and wound healing correlation.
    • Studies were analyzed for direct links between HbA1c and wound healing, with particular attention to randomized controlled trials (RCTs).

    Main Results:

    • The average HbA1c in reviewed studies was 8.6% (intervention) and 8.3% (control), with many patients having levels above 7.0%.
    • Twenty-five out of thirty studies found no direct correlation between HbA1c levels and wound healing.
    • No RCT data demonstrated that HbA1c below 7.0% improves diabetic wound healing; wounds healed even with high HbA1c levels.

    Conclusions:

    • The evidence does not support denying hyperbaric oxygen therapy to diabetic foot ulcer patients with HbA1c > 7.0%.
    • Elevated HbA1c levels, often seen in patients with limb-threatening DFUs, do not preclude wound healing.
    • Current practices of denying HBO2 based on HbA1c thresholds are unfounded and require re-evaluation.