Logan Steele
Ischemia is a vascular disease that occurs when there is an interruption in the arterial blood supply to a tissue, organ, or extremity. This interruption can be caused by a blockage or obstruction in the artery, resulting in a lack of oxygen-rich blood flow to the affected area. Muscle ischemia, specifically, can be caused by prolonged compression or vascular injury, leading to a decrease in blood flow and oxygen supply to the muscles. This can result in serious complications, including tissue death and organ failure, if not treated promptly.
| Characteristics | Values |
|---|---|
| Type | Muscle ischemia, also known as diabetic muscle ischemia or diabetic myonecrosis |
| Cause | Prolonged compression or vascular injury |
| Anaerobic metabolism | Decrease in ATP production |
| Na/K ATPase | Diminished activity |
| Intracellular fluid | Accumulation |
| Intracellular Ca++ concentration | Increase |
| Neutrophil chemoattractants | Increase |
| Reperfused tissue | Damage |
| Acute Limb Ischemia | Arterial perfusion to skeletal muscle decreases suddenly |
| Acute arterial occlusion | Embolism or thrombosis |
| Diabetic muscle ischemia | Charcot neuroarthropathy |
| Limb muscles | Any extrinsic or intrinsic muscle group can be affected |
| Lower legs | Resembles compartment syndrome or venous thrombosis |
| Revascularization | Local effects include muscle necrosis and compartment syndrome |
| Systemic effects | Hepatic and renal dysfunction, acute respiratory distress syndrome (ARDS) and multi-organ failure |
| Ischemia/reperfusion injury (IRI) | Most serious adverse consequence after restoration of blood flow |
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What You'll Learn
Atherosclerosis
The build-up of plaque in atherosclerosis narrows the arteries, reducing the amount of oxygen-rich blood that can reach the heart muscle. This can lead to ischemia and angina, as well as an increased risk of blood clots. Atherosclerosis can also cause blood clots directly when the plaques rupture and attract blood clots that block the narrowed arteries.
Risk factors for atherosclerosis include high LDL cholesterol and triglyceride levels, tobacco use, high blood pressure, obesity, and lack of physical activity. Early diagnosis and treatment of atherosclerosis can help prevent or delay life-threatening complications such as heart attacks, strokes, and transient ischemic attacks (TIAs).
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Blood clots
Myocardial ischemia, or cardiac ischemia, occurs when blood flow to the heart muscle is reduced, resulting in insufficient oxygen supply to the heart. This condition can be caused by blood clots that form in the coronary arteries, which supply blood to the heart. Atherosclerosis, the buildup of plaque and cholesterol in these arteries, is a common cause of myocardial ischemia. When plaque ruptures, it can attract a blood clot, leading to a blockage (thrombosis) in an already narrowed artery. This blockage restricts blood flow to the heart, causing ischemia.
Brain ischemia, or ischemic stroke, can also be caused by blood clots blocking blood vessels in the brain. Acute ischemic stroke is a neurological emergency that requires immediate medical attention. Similar to myocardial ischemia, brain ischemia can be caused by atherosclerosis, where plaque buildup narrows or blocks blood vessels. Blood clots can form when plaque ruptures, further obstructing blood flow and leading to ischemia in the brain.
Limb ischemia, or peripheral ischemia, occurs when blood flow to the arms or legs is reduced. Blood clots in the extremities can lead to this type of ischemia. Symptoms of a blood clot in the leg or arm may include swelling, discolouration, and warmth in the affected area. Left untreated, limb ischemia can progress rapidly to tissue necrosis and gangrene, emphasizing the importance of prompt medical intervention.
Additionally, blood clots can contribute to critical limb ischemia, a severe form of peripheral arterial disease. In this condition, blood clots can obstruct blood flow to the limbs, resulting in pain, pallor, pulselessness, and potential paralysis. Critical limb ischemia is a serious condition that requires urgent medical attention to prevent tissue death and potential amputation.
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High cholesterol
Myocardial ischemia, or cardiac ischemia, occurs when the blood flow through one or more coronary arteries is decreased, reducing the amount of oxygen that reaches the heart muscle. This can happen suddenly when an artery becomes blocked, or it can develop slowly as arteries become blocked over time. Atherosclerosis, or the long-term accumulation of cholesterol-rich plaques in the coronary arteries, is the most common cause of myocardial ischemia.
Peripheral artery disease (PAD), also known as peripheral vascular disease (PVD), is a condition caused by high cholesterol where narrowed arteries reduce blood flow to the legs. PAD can progress to acute limb ischemia (ALI), which can result in tissue death and gangrene. Critical limb ischemia (CLI) is a stage of PAD characterised by pain at rest or non-healing ulcers.
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Diabetes
Diabetic muscle ischemia (DMI) or diabetic myonecrosis is a rare complication of poorly controlled diabetes mellitus. It is characterised by excruciating leg pain and can be detected using a T2-weighted MRI. The pathomechanism of DMI is not yet fully understood, but it is believed to be related to diabetes-induced polyneuropathy.
Diabetic muscle infarction, a similar condition, is also a rare complication of diabetes mellitus. It is characterised by painful swelling in the lower extremity and limited range of motion. The onset is usually acute, persists for several weeks, and resolves spontaneously over several weeks to months without the need for intervention. Diabetic muscle infarction can be differentiated from DMI by the absence of distal edema or involvement of the lower portions of the limb.
Silent myocardial ischemia, or lack of blood flow to the heart muscle, is also more common in people with diabetes. This can be caused by a buildup of plaque and cholesterol inside the coronary arteries, which supply blood to the heart muscle. Atherosclerotic plaque is responsible for 70% of fatal heart attacks caused by ischemia.
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Trauma
Crush injuries are a common form of trauma that can lead to acute traumatic peripheral ischemia. In such cases, a more aggressive treatment schedule of hyperbaric oxygen therapy (HBO therapy) is required, with 8 treatments over 4 days. This involves the use of a pressure vessel and 100% oxygen to deliver the benefits of hyperbaric oxygenation to the body.
Furthermore, unconsciousness due to excessive doses of central depressants like alcohol or opioids can result in ischemia of the extremities. This occurs due to unusual body positions that prevent normal circulation, leading to inadequate blood flow to the limbs.
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