- Case Report
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Rhabdomyolysis-induced acute kidney injury requiring hemodialysis after a prolonged immobilization at home in 2 morbidly obese women: case reports with literature review
Renal Replacement Therapy volume 6, Article number: 30 (2020)
Rhabdomyolysis may develop into acute kidney injury (AKI), a life-threatening complication. Obese people are at risk for rhabdomyolysis due to prolonged immobilization. However, there are only a few reports of rhabdomyolysis-induced AKI due to prolonged immobilization after falls in morbidly obese people. Myoglobin is a causative compound for rhabdomyolysis-induced AKI, but the lack of treatments targeting its mechanism is a problem.
Two morbidly obese women (body mass index > 40.0 kg/m2) who fell on the floor at home and remained in the same posture for more than 12 h developed rhabdomyolysis-induced AKI. Both patients received aggressive fluid resuscitation but required hemodialysis because of persistent oliguria. They underwent 11 and 2 intermittent hemodialysis (HD) sessions with a conventional polymethylmethacrylate (PMMA) high-flux dialyzer, respectively, and their renal functions returned to baseline after withdrawal of HD.
We should be aware that morbidly obese people are at risk for rhabdomyolysis-induced AKI due to prolonged immobilization, such as after falls. At present, prophylactic renal replacement therapy (RRT) is not recommended for rhabdomyolysis. We need to reevaluate whether RRT using the appropriate membranes to effectively remove myoglobin including the PMMA membrane can improve the renal outcome in patients with rhabdomyolysis-induced AKI.
Rhabdomyolysis is caused by damage to skeletal muscle, resulting in the release of its breakdown products, including myoglobin, into the circulation, and it can lead to acute kidney injury (AKI), a life-threatening complication . Myoglobin is recognized as a causative compound of AKI. Common causes of rhabdomyolysis are trauma (crush syndrome), exertion, muscle hypoxia, genetic defects, infections, body-temperature changes, metabolic/electrolyte disorders, and drugs/toxins . Muscle hypoxia or crush syndrome-like mechanisms can be induced by limb compression by the head or torso during prolonged immobilization . This condition is called pressure-induced rhabdomyolysis . Morbidly obese people are at risk for rhabdomyolysis due to trauma or immobilization after prolonged surgery [4,5,6]. However, there are a few reports on rhabdomyolysis-induced AKI due to prolonged immobilization after a fall in morbidly obese people.
We describe here two morbidly obese women who showed rhabdomyolysis due to prolonged immobilization after a fall at home. Despite aggressive fluid resuscitation, both patients required hemodialysis (HD) and recovered renal function. It is known that severe AKI is a risk for mortality and the development of chronic kidney disease (CKD) even after full recovery of renal function . No intervention has been demonstrated to prevent AKI in humans. At present, prophylactic renal replacement therapy (RRT) is not recommended in patients with rhabdomyolysis. However, various kinds of dialyzer membranes such as the medium-cut-off (MCO) membrane , which can effectively eliminate large to middle-sized molecules, including myoglobin, have been developed and are used in patients with end-stage kidney disease. Thus, we need to reevaluate whether RRT using the appropriate membrane to effectively remove myoglobin could improve renal outcome in patients with rhabdomyolysis-induced AKI.
A 67-year-old woman fell on her home bathroom floor due to dizziness in the morning and could not move. She was found by her husband 12 h after the fall. She was lying on her left side, with her left arm underneath her body. Her body and right leg, with the hip joint in a highly flexural position, were trapped between the toilet and the wall. She complained of paralysis of the left upper arm. She was transferred to our hospital. She had a history of hypertension, for which she was taking 4 mg/day of candesartan; hyperlipidemia, for which she was taking 5 mg/day of atorvastatin; and CKD stage G3b, probably due to nephrosclerosis. She had used a wheelchair because of knee joint pain due to osteoarthritis.
Physical examination upon admission showed clouding of consciousness (Glasgow Coma Scale of 14), height of 155 cm, body weight of 101.9 kg, body mass index (BMI) of 42.4 kg/m2, body temperature of 39.9 °C, blood pressure of 88/39 mmHg, heart rate of 102/min, respiratory rate of 20/min, and an oxygen saturation of 98% under 3 L/min oxygen by reservoir mask. Coarse crackles were audible in both lungs. Skin breakdown was found on the left upper arm and the left thigh. Tenderness and loss of sensation were found from the left forearm to the wrist and from the right lower leg to the toe. She showed muscle weakness in the left forearm, the left fingers, the right thigh, and the right leg.
Laboratory findings were as follows: urinalysis showed dark brown color, pH of 5.0, 3+ occult blood with 5–9 red blood cells/high-power field, and 2+ protein. Blood analysis showed hemoglobin of 13.8 g/dL, white blood cell count of 10,900/μL, platelet count of 167,000/μL, albumin of 3.6 g/dL, blood urea nitrogen of 22.6 mg/dL, creatinine of 2.23 mg/dL, creatine kinase (CK) of 57,542 U/L, myoglobin of 9,300 ng/mL, Na of 136 mEq/L, K of 5.4 mEq/L, Ca of 7.4 mg/dl, P of 5.3 mg/dl, and C-reactive protein of 15.43 mg/dL.
Chest X-ray in the decubitus position showed a 63% cardiothoracic ratio. Plain computed tomography (CT) showed an infiltrative shadow at the left lung, suggestive of pneumonia, and a slightly atrophic kidney. Plain CT of her extremities showed swelling and low-density areas in the right quadriceps femoris muscle (Fig. 1a), indicative of muscle necrosis.
Norepinephrine was infused to maintain blood pressure immediately after admission. She received acetate Ringer’s solution in 2000 mL boluses and maintenance hydration, but the urine output was 20 mL/h and then further decreased. Pneumonia was treated with ampicillin sodium/sulbactam sodium. Though blood pressure was normalized, she initiated HD 11 h after hospitalization because of persistent oliguria. She underwent HD with a conventional polymethylmethacrylate (PMMA) high-flux dialyzer, Toray NF-1.6H® (4- to 5-h duration, blood flow 150 to 200 mL/min, dialysate flow 500 mL/min) at the right internal jugular vein using a venous catheter. Ultrafiltration rate during each dialysis session was no more than 8.9 mL/h/kg. The total amounts of albumin in the effluent dialysate by using NF-1.6H® (4-h duration, blood flow 270 mL/min, dialysate flow 500 mL/min) was reported to be about 1.8 g/HD session . She discontinued HD after 11 sessions, at which time her serum creatinine level was decreased to around the baseline value 28 days after discontinuation of HD. Her wound cured, and she was discharged 47 days after admission to a rehabilitation hospital with slight paralysis in the left arm and disuse muscle weakness.
A 48-year-old woman fell down on the floor in the bedroom due to slipping late at night and kept lying because of damage to the left leg. She was in the supine position until she called the fire station at 4:30 pm the next day by her cell phone, which she happened to find nearby. She was transferred to our hospital. She had diabetes mellitus at the age of 43 and took metformin hydrochloride of 2250 mg/day and tofogliflozin hydrate of 20 mg/day, and she took apixaban of 10 mg/day for atrial fibrillation.
Upon admission, she complained of numbness in the left lower leg and pain in the back and the buttocks. Physical examination on admission showed alert consciousness, height of 162 cm, body weight of 113.4 kg, BMI of 43.2, kg/m2, body temperature of 36.5 °C, blood pressure of 128/83 mmHg, heart rate of 113/min, and oxygen saturation of 100% under 3 L/min oxygen by reservoir mask. The left leg showed tenderness, redness, swelling, loss of sensation, and muscle weakness.
Laboratory findings were as follows: urinalysis showed dark brown color, pH of 6.5, 3+ occult blood with 5–9 red blood cells/high-power field, and 2+ protein. Blood analysis showed hemoglobin of 14.8 g/dL, white blood cell count of 30,100/μL, platelet count of 468,000/μL, albumin of 4.5 g/dL, blood urea nitrogen of 20.8 mg/dL, creatinine of 3.13 mg/dL, CK of 101,654 U/L, Na of 138 mEq/L, K of 6.2 mEq/L, Ca of 6.5 mg/dL, P of 6.4 mg/dL, and C-reactive protein of 2.02 mg/dL.
The electrocardiogram showed atrial fibrillation. Intravenous calcium gluconate and glucose-insulin therapy were performed for hyperkalemia. She began to receive fluid resuscitation with 200 to 250 mL of isotonic saline per hour. Plain CT showed subcutaneous edema in the left lower leg and swelling and low-density areas in the left adducent muscles (Fig. 1b) and in the left gastrocnemius muscle (Fig. 1c) and swelling and low-/high-density areas in the soleus muscle (Fig. 1c), suggestive of muscle necrosis and calcification. She became hypotensive and required a norepinephrine infusion. Compartment syndrome was rejected. Creatinine was increased to 4.91 mg/dL with oliguria despite enough hydration; thus, she required HD 4 days after admission and underwent 2 HD sessions with a conventional PMMA high-flux dialyzer, Toray NF-2.1H® (4-h duration, blood flow 150 to 180 mL/min, dialysate flow 500 mL/min) at the right internal jugular vein using a venous catheter. Ultrafiltration rate during each dialysis session was no more than 7.5 mL/h/kg. Serum creatinine was decreased to 0.55 mg/dL 30 days after discontinuation of HD. She was discharged 70 days after admission with slight pain in the left knee and loss of sensation and muscle weakness in the left leg. She moved to a rehabilitation hospital.
Rhabdomyolysis is a well-recognized cause of AKI, and myoglobin, a 17,500-Da oxygen carrier, is a causative compound of rhabdomyolysis-induced AKI . Recently, Stahl et al. recommend a clinical syndrome of acute muscle weakness, myalgia, and muscle swelling combined with a CK cut-off value of > 1000 IU/L or CK > 5 × upper limit of normal for the standard definition of a mild rhabdomyolysis . A CK level of 5000 U/L or greater associated with myoglobinuria is likely related to AKI caused by rhabdomyolysis . Need of renal replacement therapy (RRT) is rarely seen with CK levels below 40,000 U/L upon admission . Dehydration, acidic urine, and other comorbid conditions other than myoglobin itself are also thought to be important factors in the pathogenesis of AKI in patients with rhabdomyolysis. Our case 1 had the combination of dehydration, angiotensin receptor blocker use, and CKD, which could contribute to AKI due to reduced glomerular filtration rate. However, it is sometimes difficult to isolate the leading cause of AKI, and the term “rhabdomyolysis-induced AKI” is conventionally used under the condition.
Pressure-induced rhabdomyolysis and AKI are caused by prolonged immobilization mainly due to alcohol abuse, drug intoxication, or anesthesia for surgery . It was reported that outside of surgical cases, the most common position to induce rhabdomyolysis and AKI was lateral decubitus, the lower extremities were most often involved, and 93% of patients presented with compartment syndrome in the affected muscle groups . Though reported patients with pressure-induced rhabdomyolysis and AKI after falls in a state of consciousness, like our patients, are rare in the English-language literature [3, 13], there is a possibility that they were merely not reported.
Obese people are at risk for rhabdomyolysis due to trauma  or immobilization, especially after prolonged surgery [5, 6]. Direct prolonged mechanical pressure on muscle tissue, resulting in muscle hypoxia and/or crush syndrome-like injury, is reported to be the main mechanism of rhabdomyolysis after prolonged surgery in obese patients . In a prospective cohort study involving 49 obese patients undergoing bariatric surgery for obesity, the risk of rhabdomyolysis increased with prolonged surgery (> 4 h), BMI > 40 kg/m2, and diabetes mellitus . More recently, a multicenter, prospective study reported that after bariatric surgery, the risk of rhabdomyolysis increased when the duration of surgery was > 230 min . Our patients had similar risks for rhabdomyolysis as people undergoing bariatric surgery, such as BMI > 40 kg/m2 and immobilization of >230 min. Since our patients were carried into the emergency room, serum CK and creatinine were immediately measured, and the diagnosis was made. However, muscle damage after a fall at home is apt to be treated lightly because it is thought that those injuries are mild; thus, blood and urine tests might not be done in the first place in primary care institutions. As in our cases (Table 1), it has been reported that the severity of rhabdomyolysis-induced AKI did not correlate with the degree of muscle injury as reflected by serum CK activity , but another study found a weak linear correlation between CK and creatinine levels . The number of obese people has increased worldwide, so the number of cases similar to ours must have also increased, suggesting that monitoring of serum CK and creatinine is critical not to overlook rhabdomyolysis-induced AKI in morbidly obese people.
Although the majority of patients with AKI due to rhabdomyolysis recover their renal function, the mortality in the intensive care unit has been reported to be 59% when AKI is present and 22% when it is not present . Since rhabdomyolysis by crush syndrome or immobilization is usually associated with volume depletion due to the sequestration of water in injured muscles, early and aggressive fluid resuscitation using isotonic saline is recommended as a conservative therapy: it increases renal blood flow, thereby increasing the secretion of nephrotoxic compounds, such as myoglobin, maybe preventing AKI . Aciduria promotes myoglobinuric-renal injury by acute precipitation of myoglobin within the kidney in animal models . Therefore, alkalization of the urine is a theoretical intervention in rhabdomyolysis, but randomized controlled trials, systematic reviews, or observational studies on alkalization compared to none did not show evidence of a clinical benefit in patients with rhabdomyolysis-induced AKI . Current consensus statements describe that sodium bicarbonate administration is not necessary and not superior to normal saline diuresis in increasing urine pH [17, 18]. Fluid resuscitation can sustain urine output to inhibit myoglobin concentration in renal tubules and to correct aciduria. Alkalization of the urine and mannitol use for forced diuresis are recommended under specific circumstances but have not been shown to change clinical outcomes in patients with crush syndrome [2, 12].
Our 2 morbidly obese women with rhabdomyolysis-induced AKI required HD for renal indication despite aggressive fluid therapy. The clinical characteristics of both cases are summarized in Table 1. Fortunately, in both cases, renal function returned to baseline after discontinuation of HD. However, severe AKI is known to be a risk for mortality and the development of CKD even after recovery . At present, prophylactic RRT to remove serum myoglobin is not recommended because of no evidence of improvement of renal outcome in patients with rhabdomyolysis-induced AKI by RRT. However, various kinds of membranes, which can remove myoglobin effectively with less albumin leakage are now available in Japan and other countries ; thus, we need to reevaluate whether RRT can improve the renal outcome in patients with rhabdomyolysis-induced AKI. If RRT using the appropriate membrane proves to be effective, early introduction of RRT for nonrenal indications might lessen the risks for mortality and the development of CKD in patients with rhabdomyolysis-induced AKI.
Obesity and AKI
Obesity is an independent risk factor for AKI, which, if severe enough, requires dialysis. In a cohort of 14,986 critically ill patients, each 5 kg/m2 increase in BMI was associated with a 10% risk of more severe AKI . There are some factors that may lead to the increased risk for AKI in obese people. Excess abdominal fat in obese patients is associated with intra-abdominal hypertension, which can predispose critically ill patients to AKI via renal venous congestion and poor arterial perfusion from decreased venous return . Obesity is associated with increased levels of pro-inflammatory cytokines , oxidative stress , and endothelial dysfunction . These factors are known to be associated with a development of AKI. In addition, the morbidly obese patients are more likely to present with co-morbidities such as hypertension, diabetes and cardiovascular diseases . Not only these co-morbidities but also obesity itself is a risk factor for CKD , and CKD is also an important risk factor for the development of AKI . Both of our cases were prone to cause AKI because case 1 had CKD and case 2 had diabetes. Moreover, diabetes shows muscular weakness, which could partly be explained by alteration of membrane homeostasis and diabetic microangiopathy which can favor muscular ischemia . Thus, besides direct prolonged mechanical pressure on muscle tissue, diabetes was also a risk for the development of rhabdomyolysis in case 2.
Rhabdomyolysis is a widely recognized complication in statin use. Our case 1 was treated with atorvastatin. The relation of BMI to statin-associated rhabdomyolysis or muscle symptoms is controversial. Some researchers reported obesity as a risk factor , whereas others found that a small body frame and frailty increased the risk .
There were only 2 reported cases with rhabdomyolysis-induced AKI after falls in a state of consciousness, like our cases [3, 13]. A 39-year-old man did not need dialysis therapy, and another 82-year old man required a short period of HD 5 days after infusion of saline . BMI was not described, but both reported cases had no previous risk factors for AKI, indicating that rhabdomyolysis-induced AKI requiring dialysis could occur after a fall on a floor in people without any risk factors for AKI except older age.
RRT for rhabdomyolysis-induced AKI
Myoglobin is a causative compound of rhabdomyolysis-induced AKI, so removal of circulating myoglobin is theoretically effective in preventing AKI in patients with rhabdomyolysis. However, the benefit of rapidly removing circulating myoglobin by RRT has not been established. Peritoneal dialysis is inadequate to remove the large solute loads in patients with rhabdomyolysis . The removal of myoglobin by plasma exchange has demonstrated controversial benefits [31, 32]. We used intermittent HD in our cases for renal indication. However, there are other choices to increase removal amount of myoglobin, such as prolonging the time of treatment including continuous RRT (CRRT) or using hemodiafiltration (HDF) with or without albumin supplementation as well as the selection of membrane and operating condition. CRRT using conventional high-flux filters has been found to eliminate more myoglobin than standard intermittent HD . Zeng et al.  systematically reviewed the potential benefits of CRRT compared with conventional therapy (supportive therapies and/or intermittent HD) in patients with rhabdomyolysis-induced AKI. However, there was insufficient evidence to discern any likely benefits of CRRT over conventional therapy in reducing in either mortality or preventing AKI in patients with rhabdomyolysis, and CRRT was not advocated for preventing AKI or improving renal outcome.
An increasing number of reports indicate that a high-cut-off (HCO) membrane, which can filter out molecular weights closer to that of the native kidney (65,000 Da) and clear more myoglobin than a conventional high-flux membrane (MW cut-off of 10,000–20,000 Da), is beneficial for rhabdomyolysis-induced AKI [33, 35,36,37,38,39,40]. A case series of patients with severe rhabdomyolysis demonstrated that continuous veno-venous HD (CVVHD) and sustained low-efficiency daily dialysis with HCO membranes allowed a considerable removal of myoglobin, 60% after 2 h and 70% after 4 h in the latter condition . In 2 case reports, patients with rhabdomyolysis showed a decline in serum myoglobin level by 50% after 4 h or 50–55% after 1 h and by 61–71% after 3 h using HCO intermittent HD, respectively [39, 40]. In a prospective, randomized, single-blindedsingle-center trial, 60 critically ill patients with AKI and established indications for RRT were randomized 1:1 into two groups. The trial found a significantly better elimination of myoglobin in the intervention group with CVVHD using the HCO membrane than with CVVHD using the conventional high-flux membrane. Despite this theoretical advantage, the HCO membrane still suffers from a loss of unacceptable amounts of albumin (MW 66,000 Da) and other essential proteins and a high price .
The medium cut-off (MCO) membrane exhibits highly selective permeability and have both high-quality and good performance for dialysis treatment, showing the removal of large to middle-sized molecules, up to MW 45,000 Da, including the 17,500-Da myoglobin, like HCO membranes, and the low removal of albumin, like most advanced high-flux membranes . It can achieve the same removal performance as that achieved by HDF . On the other hand, the solute removal characteristics of the MCO membrane are considered to be almost the same as those of the type IIa dialyzer (albumin sieving coefficient < 0.03, β2MG clearance > 70 mL/min) in the current Japanese classification. It was reported that MCO dialyzer is superior to conventional HD with standard high-flux dialyzers in the removal of middle and larger middle molecules and it is not inferior to online-HDF . Mean reduction rate (RR) of myoglobin using high-flux HD with FX80 dialyzer (Fresenius Medical Care, Bad Homburg, Germany), HD with MCO Theranova dialyzer (Gambro Dialysatoren, Hechingen, Germany, a subsidiary of Baxter International), and online-HDF using FX 1000 dialyzer (Fresenius Medical Care) was 34.3%, 62.5%, and 72.4%, respectively . We measured serum myoglobin before and after HD session in case 1, and RR of myoglobin was calculated to be 61.6%. RR of myoglobin using HD with the PMMA dialyzer NF-H 1.6 in our case 1 was comparable to that using HD with MCO dialyzer.
The PMMA membrane belongs to the type S dialyzer with special biocompatibility in Japanese classification and has an absorbed ability of several kinds of proteins including interleukin-6 [45, 46]. Obese people have higher baseline levels of pro-inflammatory mediators such as interleukin-6 which may increase the risk for the developing AKI . Thus, the treatment with the PMMA dialyzer NF-H can be considered to have a preventive effect on rhabdomyolysis-induced AKI in morbidly obese people in terms of sufficient removal of myoglobin and the absorbed ability of interleikin-6.
Rapidly removing circulating myoglobin just after rhabdomyolysis may be essential for preventing AKI. However, to achieve elimination of serum myoglobin to a nontoxic level, we need to know how we should decide to start RRT and also to discontinue RRT, especially when myoglobin release is prolonged significantly. CK, myoglobin, and urine dipstick are among the most studied predictive factors for AKI following rhabdomyolysis. Although CK peak is a late severity marker of rhabdomyolysis, CK level of 5000 U/L or greater, which is likely related to AKI caused by rhabdomyolysis , is one of the indices to start preventive dialysis treatment. Serum myoglobin level peaks 8 to 12 h after muscle damage, followed by the serum CK peak . Serum myoglobin was reported to show unpredictable metabolism, partly in the kidney but mainly outside the kidney, probably in the liver or spleen [48, 49]. Serum myoglobin has a rapid metabolism and disappears from circulation within 24 h when there is no further release of myoglobin , indicating that the serum myoglobin level is extremely dependent on the timing of measurement. Therefore, serum myoglobin levels are not reliable for the diagnosis or management of rhabdomyolysis. Like urine myoglobin level upon admission in our case 2 in Table 1, urine myoglobin is not a sensitive test for rhabdomyolysis, nor is it specific for the development of AKI; therefore, it is not necessary for routine testing [50, 51]. The presence of increasing amounts of blood by urinalysis progressively raises the probability of myoglobinuria, especially in the absence of hematuria. This predictive information may be useful for the initial assessment of patients with rhabdomyolysis and perhaps for detection of patients at risk for AKI following rhabdomyolysis and monitoring urine myoglobin clearance . Thus, urinalysis might be applicable for another index to start preventive dialysis treatment. However, there are limited data about the degree of positive urine dipstick for blood and cut-off point of red blood cells per high power field related to AKI. Moreover, it is not known how clinicians should evaluate the patients with pre-existing hematuria like in our case 2 with preexisting CKD.
We should be aware of the importance of monitoring rhabdomyolysis so as not to overlook it in morbidly obese people who are at risk for rhabdomyolysis after prolonged immobilization. High-quality randomized controlled trials are needed to evaluate whether RRT using the appropriate membrane to effectively remove myoglobin including the PMMA membrane could become the first line of preventive measures for rhabdomyolysis-induced AKI.
Availability of data and materials
All data analyzed during this study are included in this published article.
Acute kidney injury
Body mass index
Chronic kidney disease
Continuous renal replacement therapy
Continuous veno-venous hemodialysis
Renal replacement therapy
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Sakai, K., Omizo, H., Togashi, R. et al. Rhabdomyolysis-induced acute kidney injury requiring hemodialysis after a prolonged immobilization at home in 2 morbidly obese women: case reports with literature review. Ren Replace Ther 6, 30 (2020). https://doi.org/10.1186/s41100-020-00277-w
- Acute kidney injury
- Body mass index
- Creatine kinase
- High cut-off membrane
- Medium cut-off membrane
- Morbidly obesity
- Polymethylmethacrylate membrane
- Renal replacement therapy