Vein of Galen malformations
Nov. 28, 2022
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas.
Medical complications following stroke account for significant morbidity and mortality, and conditions need to be recognized early and managed effectively for a more favorable outcome. Direct effects of ischemic stroke account for most deaths within the first week. Other medical complications that include cardiac abnormalities, infections, and venous thromboembolism increase mortality thereafter. In this article, the author discusses the medical complications of stroke-related deficits, their workup, and treatment modalities.
• Venous thromboembolism is one of the most common and potentially dangerous complications of stroke because of impaired limb mobility. In the case of intracerebral hemorrhage, early anticoagulation is of concern.
• Although promising, the new oral anticoagulants need further testing before they may be used as anticoagulants of choice.
• During acute stroke phase, thrombolysis is contraindicated for treatment of severe pulmonary embolism.
• Limited mobility following stroke increases the risk of osteoporosis, fractures, pressure sores, painful arthritis, and peripheral neuropathy.
• Post-stroke pain may be severely debilitating and refractory to conventional analgesics. More testing is needed for invasive neurosurgical procedures and noninvasive transcranial magnetic stimulation.
Prospective studies suggest that direct effects of ischemic stroke, such as hemorrhagic conversion or cerebral edema, account for most deaths within the first week. However, medical complications account for at least 50% of mortality thereafter (150; 66).
Medical complications of stroke decrease survival by several years (05). Admission to stroke units significantly reduce these complications, including immobility and mortality within the first 4 weeks (03). Later, the dominant complications are venous thromboembolism, pneumonia, urosepsis, cardiac arrhythmias, and myocardial infarction. Other complications include falls, pressure sores, psychiatric disorders, and central poststroke pain. Prevention of aspiration by speech and swallow evaluations, avoidance of urinary catheters, and prophylaxis of thromboembolism are most beneficial (150).
The classification scheme for post-stroke medical complications is outlined in Table 1 (89). Several of these topics are discussed in other clinical summaries. The topics discussed in this article are listed in Table 2.
I. Neurologic complications
(A) Urinary tract infection
III. Complications of immobility
(A) Deep venous thrombosis
(A) Shoulder pain
VI. Psychological complications
(A) Gastrointestinal hemorrhage
I. Disorders of immobility
(A) Deep venous thrombosis and pulmonary embolus
(A) Shoulder pain
Epidemiology. Venous thromboembolism is a major cause of morbidity and mortality after acute ischemic stroke. In absence of prophylaxis, thrombus formation begins on the second day after stroke and may affect up to 50% of patients at 2 weeks (15). The risk is higher in those with severe paralysis (88). Before prophylaxis became routine, clinically apparent deep venous thrombosis was associated with mortality from pulmonary embolism in 37% of cases (19). Pulmonary embolism is responsible for about 5% to 10% of deaths in the acute period and 25% later (71). In a series of patients with ischemic and hemorrhagic stroke, pulmonary embolism was not diagnosed in half of the patients before death (179). Sudden death occurred in 50% of patients with pulmonary embolism.
Among patients with ischemic stroke discharged between 1979 to 2003, 1.17% had venous thromboembolism, 0.74% had deep venous thrombosis, and 0.51% had pulmonary embolism; in those with hemorrhagic stroke, the rates were higher, 1.93%, 1.37%, and 0.68%, respectively (151).
Etiology of venous thromboembolism is multifactorial and involves Virchow's triad: vessel wall damage, venous stasis, and hypercoagulability (146; 76). Damage to the vessel wall prevents the endothelium from inhibiting coagulation and initiating local fibrinolysis.
The risk factors for arterial stroke and venous thromboembolism overlap significantly. Obesity, cigarette smoking, and hypertension are independent risk factors for pulmonary embolism, whereas hypercholesterolemia and diabetes mellitus are not (49). Venous stasis due to immobilization or obstruction leads to accumulation of activated coagulation factors. Following stroke, the paretic leg is preferentially affected due to a repeated minor trauma and loss of the calf muscle pump (78). Additionally, atrial fibrillation, oral contraceptives, hormone-replacement therapy, and several inherited thrombophilias (such as hyperhomocysteinemia and activated protein C resistance) predispose to both venous thromboembolism and ischemic strokes (119; 48).
Other risk factors include severity of the illness, age, dehydration, delayed institution of preventive measures, hemorrhagic stroke, cryptogenic ischemic stroke, previous venous thromboembolism, morbid obesity, and prothrombotic conditions, including contraceptive use (144; 07).
Pulmonary embolism may be asymptomatic or massive, leading to sudden death. Almost 40% of asymptomatic patients with deep venous thrombosis have evidence of pulmonary embolism on lung scans (114). Although 90% of emboli originate in the lower extremities, venous ultrasound was positive in only 29% of patients with pulmonary embolism (164). The remainder emboli arose mostly from pelvic deep venous thrombosis (71).
Differential diagnosis. Edema of the immobilized paretic limb may mimic deep venous thrombosis. Respiratory failure may be due to cerebral herniation or a brainstem lesion. The post-thrombotic syndrome (PTS) attributed to venous hypertension and abnormal microcirculation (14) is characterized by edema and pain with or without venous ulceration (78).
Diagnostic workup. Testing is guided by the clinical suspicion. Most patients with pulmonary embolism have at least one of these symptoms: sudden onset dyspnea, chest pain, syncope, and hemoptysis (109).
Pretest clinical probability of pulmonary embolism (Tables 3 and 4) and the scoring developed: Wells (172), Geneva (174), and Pisa (110), are used to determine the need further studies.
D-dimer level is elevated in myocardial infarction, pneumonia, heart failure, cancer, recent surgery, and stroke (48). Normal D-dimer level combined with low pretest clinical probability excludes thrombotic disease.
A high pretest probability should not affect clinical decision (173). If clinical probability is high, a normal D-dimer level does not exclude venous thromboembolism. This needs to be confirmed with lower limbs ultrasonography or helical CT scan of the chest (145). However, CT alone may not be sensitive enough to exclude pulmonary embolism in these patients (141).
Recently bedridden for more than 3 days or major surgery within 12 weeks
Previous pulmonary embolism or deep venous thrombosis
Prevention of thromboembolism. Nonpharmacologic prevention includes early mobilization, graduated compression stockings, and pneumatic sequential compression devices.
Bed rest following stroke should be restricted to patients with large cerebellar or cerebral lesion and increased intracranial pressure, severe angina and myocardial infarction, deep venous thrombosis (prior to anticoagulation), and postural ischemia due to large-vessel carotid or vertebrobasilar artery disease. If possible, avoid intravenous lines in the paretic arm as they may increase the risk of deep venous thrombosis.
The thigh-length graduated compression stockings (GCS) did not reduce the incidence of proximal deep venous thrombosis after stroke and caused skin complications (30).
However, intermittent compression stockings prevent deep venous thrombosis and increase survival in patients with acute stroke (29). The American College of Chest Physicians recommends intermittent pneumatic compression devices or elastic stockings for patients who have contraindications to anticoagulants (77).
Unfractionated heparin 5000 IU sc given 3 times daily reduced venous thromboembolism following acute stroke from 73% to 22%, along with a decrease in the combined rate for deep venous thrombosis, pulmonary embolism, and death (105).
Low molecular weight heparins may be given once daily and have a lower risk for thrombocytopenia and osteoporosis than unfractionated heparin. A metaanalysis showed that low molecular weight heparin had the best benefit-to-risk ratio in patients with acute stroke and is cost-effective (70; 149; 138).
For acute stroke patients, either low molecular weight heparin, low-dose unfractionated heparin, or danaparoid may be used (77). Heparin may be used after 24 hours from thrombolysis; the combination with aspirin may be safely used later.
In an observational study, the addition of sequential compression devices to unfractionated heparin reduced the risk of deep vein thrombosis more than 40-fold (71).
After intracerebral hemorrhage, anticoagulation is delayed by one day to reduce the risk of hemorrhage expansion. In a small, randomized study, initiation of low-dose unfractionated heparin (5000 U sc 3 times daily) on the second day from ictus significantly lowered the incidence of pulmonary embolism, compared with delayed (day 4 or day 10) therapy (10). In another prospective randomized study of 75 patients, low-dose enoxaparin (40 mg sc daily) initiated 2 days after onset was as effective and safe as the compression stockings (122). However, a Cochrane review found 2 randomized controlled trials totaling 120 patients that failed to provide evidence for or against the use of anticoagulants for venous thromboembolism prophylaxis (134). A randomized controlled trial, stopped prematurely because of low recruitment, and a meta-analysis that included these patients showed that anticoagulation for venous thromboembolism prevention is safe but did not significantly reduce the incidence of venous thromboembolism, pulmonary embolism, or death (126).
In patients at risk for heparin-induced thrombocytopenia (HIT), fondaparinux, an indirect factor Xa inhibitor, 2.5 mg sc is a safe alternative (55).
The new oral anticoagulation (NOAC) agents have not yet been tested in patients with ischemic stroke. Nevertheless, 4 systematic reviews, network meta-analyses (NMAs), and cost-effectiveness analyses of randomized controlled trials have not shown strong evidence that they should replace postoperative low molecular weight heparin in primary prevention of venous thromboembolism. For acute treatment and secondary prevention of venous thromboembolism, there is little evidence that new oral anticoagulants are more efficacious than warfarin. However, the risk of hemorrhagic complications was lower for some new oral anticoagulants than for warfarin (155).
Treatment of venous thromboembolism in stroke patients. Initiation of treatment in patients with suspected venous thromboembolism depends on the strength of the clinical suspicion, how rapidly the results of the confirmatory tests are available, and the location of the deep venous thrombosis or pulmonary embolism.
For high clinical suspicion, parenteral anticoagulant is indicated while waiting for the results of diagnostic tests. If the suspicion is intermediate, initiation of parenteral anticoagulation is indicated if the results of diagnostic tests are likely to be delayed for more than 4 hours. In patients with low suspicion, there is no need to initiate parenteral anticoagulation provided the results will be available within 24 hours.
If deep venous thrombosis is isolated to a distal segment of the leg, and there are no severe symptoms or risk for extension, serial imaging for 2 weeks is reasonable. However, if the distal deep venous thrombosis is accompanied by severe symptoms and there is risk of extension, initiation of anticoagulation over serial imaging is recommended. Extension of the distal thrombus on serial imaging warrants anticoagulation. In patients with venous thromboembolism, once-daily low molecular weight heparin or fondaparinux is preferred over unfractionated heparin.
Some patients prefer to avoid the post-thrombotic syndrome (PTS) and accept a higher risk of bleeding. They may benefit from catheter-directed or systemic thrombolysis.
If anticoagulation is contraindicated, like in intracerebral hemorrhage, a temporary inferior vena cava (IVC) filter is recommended. Anticoagulation should be resumed if the contraindication no longer exists. However, insertion of IVC filter is not recommended in addition to anticoagulation.
The duration of therapy for the first unprovoked venous thromboembolism is 3 months if the risk of bleeding is high and extended if the risk of bleeding is low or moderate. At the end of 3 months, the risk-benefit ratio should be reassessed before further recommendations are made. If venous thromboembolism is provoked by either surgery or a transient nonsurgical factor, the duration of anticoagulation is 3 months. If cancer is present, extended anticoagulation is recommended regardless of the bleeding risk.
Compression stockings for 2 years or more are indicated in patients with symptomatic deep venous thrombosis of the leg or post-thrombotic syndrome. If they fail to relieve the symptoms, a trial of intermittent compression device is reasonable.
If acute pulmonary embolism causes hypotension (systolic blood pressure less than 90 mmHg), intravenous thrombolysis may be used if not contraindicated. Analysis of a National Inpatient Sample (NIS) from 2009 to 2012 revealed that systemic thrombolysis is associated with increased risk of hemorrhagic stroke compared with catheter-directed intervention, although mortality was similar (96). In critical situations in which thrombolysis or catheter assisted thrombectomy failed or the patient is in shock and likely to die within a few hours, surgical pulmonary thrombectomy may be beneficial (77).
Venous thromboembolism is treated with intravenous unfractionated heparin and oral warfarin initiated on the same day. Unfractionated heparin is continued for a minimum of 5 days or at least 24 hours of INR 2 or above. The ideal INR target is 2 to 3. Warfarin dosage should begin with 5 mg, not higher (57; 33). Anticoagulation clinics improve warfarin anticoagulation control, patient outcomes, and health care costs (25).
If warfarin is contraindicated, such as during pregnancy, unfractionated heparin or a low molecular weight heparin, such as enoxaparin, may be used. Early mobilization and stopping procoagulant agents (eg, hormone-replacement therapy or oral contraceptives) are both advisable.
In patients with cancer, low molecular weight heparin is preferred to warfarin. Additionally, if the patient is unreliable, long-term subcutaneous injections of a low molecular weight heparin is an alternative.
The American College of Chest Physicians recommends low molecular weight heparin or vitamin K antagonists to the newer oral agents (77). More information regarding the efficacy of the newer anticoagulants is needed.
Patients with acute venous thromboembolism taking dabigatran, a direct thrombin inhibitor, 150 mg po bid were compared with warfarin after intravenous heparin. Dabigatran was non-inferior and was associated with fewer bleedings than warfarin (147).
Rivaroxaban was also proven effective for deep venous thrombosis and pulmonary embolism treatment. A dose of 15 mg po twice daily for 3 weeks followed by 20 mg daily was noninferior to enoxaparin followed by warfarin (40; 41).
Moreover, apixaban was not inferior to enoxaparin followed by warfarin, yet caused fewer clinically relevant bleeding. The dose of apixaban was 10 mg po bid for 7 days, followed by 5 mg po bid for 6 months (01).
Stroke limits mobility and impairs stability, leading to osteoporosis and increased risk of falls and fractures. Most fractures occur late, on the hemiplegic side (144). Sequential bilateral hip fractures were seen more frequently in institutionalized patients with history of stroke and osteomalacia (26). Hip fractures are associated with an increased risk of institutionalization and death (43).
Epidemiology. Out of 130,000 discharged acute stroke patients, 2.0% suffered fractures by 1 year and 10.6% by 10 years (37). The risk of hip fracture increases 4-fold after stroke (72).
Pathophysiology. Bone strength is a composite of bone density and bone quality, with the latter thought to include bone architecture, bone damage (eg, microfractures), and mineralization. Immobilization after stroke leads to osteoporosis (144). After stroke, approximately 30% of fractures occur in the upper extremities (128).
Clinical risk factors that contribute to fracture risk independent of bone mineral density are presented in Table 5 (73).
Bone loss may result from disuse following hemiparesis. A retrospective study of 1139 patients, followed for a median time of 2.9 years, found that the hip on the weak side was the most common bone fractured after stroke (144). Fracture incidence was 2 to 4 times higher than in the general population. In another study, fractures are more common in stroke patients suffering from weakness, numbness, neglect, imbalance, or decreased awareness (139).
Vitamin D deficiency increases the risk of hip fracture in disabled elderly patients (131). Osteoporosis after stroke is related to severity of paresis, gait disability, and duration of immobilization. Nutrition, light exposure, and medications are additional contributors. Proton pump inhibitors increase the risk of osteoporosis (98). Dabigatran, a direct oral thrombin inhibitor, is associated with a lower risk of osteoporotic fractures compared to warfarin (90).
Clinical features. Vertebral fractures may cause chronic back pain, spinal deformity, functional limitations, and increased risk of hospitalization and mortality (69; 44).
Osteoporosis is defined as bone mineral density of 2.5 SD or more below the average value for premenopausal women (T score, less than -2.5 SD). In the presence of 1 or more fragility fractures, osteoporosis is considered severe (73).
Bone Mineral Density
Greater than –1
Within 1 SD of a young normal adult
Low bone mass
–1 to –2.5
Between 1 and 2.5 SD below that of a young normal adult
Less than –2.5
More than 2.5 SD below that of a young normal adult
Less than –2.5 and 1 or more fragility fractures
More than 2.5 SD below that of a young normal adult and 1 or more osteoporotic fractures
The goals of osteoporosis treatment are prevention of fractures, increased bone mass, treatment of fracture and skeletal deformity, and improvement of physical function (120). A pyramidal approach to treatment has been recommended (121). The base of the pyramid consists of lifestyle changes, including adequate calcium and vitamin D intake, physical activity, and fall prevention. Physical activity is needed for bone formation and maintenance. However, walking alone does not reduce fracture risk. Exercises that reduce the risk of falling by improving mobility, muscle function, and balance could reduce fracture risk (45). To reverse osteoporosis after hemiplegia, daily weight training for minimum 60 and 90 minutes was needed for males and females, respectively (56).
Calcium and vitamin D supplementation prevents fractures (36). The recommended dietary intake of calcium is 1000 mg/day for men and women aged 50 years or younger and 1200 mg/day for those older than 50 years of age (NIH Dietary Supplement Fact Sheet--Calcium). The recommended dose of vitamin D is 400 IU/day for men and women aged 51 to 70 years and 600 IU/day for those 71 years or older (NIH Dietary Supplement Fact Sheet—Vitamin D). The second level includes addressing and treating secondary causes of osteoporosis. The third level includes pharmacotherapeutic interventions to improve bone density and reduce the risk of fracture.
Bisphosphonates inhibit bone resorption. Zoledronate administered as a single dose of 4 mg intravenously within 5 weeks of stroke onset helps preserve bone mineral density (60).
Other drugs available are raloxifene, teriparatide, calcitonin, and certain estrogens. Raloxifene and strontium ranelate may increase the risk of venous thromboembolism and fatal stroke and should be avoided in patients at risk for stroke (169).
Falls. Traumatic brain injury, one of the most severe complications of falls, is responsible for 78% of fall-related deaths and 79% of the cost (156). Stroke doubles the risk of falling (67).
Imbalance while dressing strongly predicts falls after stroke, whereas residual motor symptoms do not (87). In another study, most falls occurred during transfers between a wheelchair and bed (133).
Depression following stroke and TIA has been associated with falls (157). Independent predictors of depression and anxiety were female sex, younger age, and higher socioeconomic deprivation score (16). Executive dysfunction after stroke further impacts balance and mobility and contributes to falls (101). These factors compounded by comorbidities, polypharmacy, decreased vision, and often decreased cognition in stroke patients pose a greater risk of falling.
The Postural Assessment Scale for Stroke patients (PASS) and the Postural Control and Balance for Stroke test (PCBS) evaluate postural control and assess the risk of fall after stroke (06; 140).
Fall prevention programs emphasize supervision of high-risk patients, proper seating, wheelchair transfers, and regular toileting.
Pressure sores. Pressure sores can develop rapidly in bedridden stroke patients. If infected, they can cause great morbidity and mortality (21).
A Swedish retrospective study of 161 patients with stroke recorded 116 pressure ulcers, 30 patients having more than 1 ulcer (58). Sacrum and the lower body are most often affected (53).
Sustained pressure due to limited mobility results in ischemia of the skin over the weight-bearing points, usually the bony prominences. Other risk factors include diabetes, peripheral vascular disease, urinary incontinence, and low body mass index (09).
Pressure sores are classified according to stages (117):
Stage I—nonblanchable erythema on intact skin.
Stage II—partial thickness skin loss of the dermis presenting as a shallow open ulcer with a red or pink wound bed, without slough.
Stage III—full thickness tissue loss involving the subcutaneous tissue or fascia. Bone, tendon, and muscle are not exposed.
Stage IV—full thickness tissue loss with exposed bone, tendon, or muscle.
The Braden Scale predicts the risk of developing pressure sores. The scores range from 6 to 23, with higher risk associated with lower scores (08; 13).
Bed sores can be prevented by turning every 2 hours, pressure-reducing devices, good skin care (especially in those with fecal incontinence), daily checks, and high protein nutritional intake (162).
Pressure sore treatment consists of using proper wound dressing and removal of the necrotic debris to prevent bacterial growth and infection (51).
Peripheral nerve injury. Compression peripheral nerve injury in stroke patients results from limb malposition and may cause additional disability or pain. The risk is increased by sensory loss, weakness, neglect, and limb edema. In addition, use of manual wheelchairs increases the likelihood of an upper limb nerve injury like the median and ulnar nerves (11). Hematoma, a complication of anticoagulation, may result in brachial plexus injury or femoral nerve entrapment (42).
Electrodiagnostic studies help establish the nerve injury site and assess the severity of injury and the need for surgical intervention. In most cases, splinting and other supportive devices as well as pain management may be sufficient.
After stroke, many patients experience pain, which impairs the quality of life. A prospective study of 443 patients with stroke showed that 29.56% suffered from pain (14.06% in acute, 42.73% in the subacute, and 31.90% in the chronic stroke stage). Headache manifested acutely, musculoskeletal and central post-stroke pain occurred more often in the subacute and chronic stage, and spasticity-related pain was prevalent in the chronic stage (129).
Central post-stroke pain. Central pain, caused by a lesion in the central nervous system, feels as a burning, aching, throbbing, cramp-like sensation or a combination of these and is often triggered by a non-noxious stimulus. Patients older than 70 years of age tend to experience nonburning pain. Characteristic to central pain is the sensory loss to pinprick or temperature in the same region; however, the spinothalamic sensation may still be preserved in many patients (85).
In a systematic review of 69 papers, central post-stroke pain was reported in 11% of strokes in any locations and in 50% of patients with medulla and thalamus strokes. Central post-stroke pain coincided with acute stroke in 26% of patients (95).
Lesions of the ventral posterolateral, ventral medial, and medial dorsal nucleus and the trigemino- and spinothalamocortical pathways, including the brainstem and cerebral cortex, lead to post-stroke pain (12; 32; 118). Pure central post-stroke pain, sometimes mistaken for malingering or psychogenic pain due to lack of associated symptoms, is related to the spinothalamic tracts from the posterolateral mesencephalon (31). Central post-stroke pain should be considered after other causes of pain are excluded.
Medial lemniscus has a modulatory role. Well-controlled central post-stroke pain due to lateral medullary stroke may recur after a second infarct involving the ipsilateral medial medullary region (80). Lesions of the ventral caudal nucleus suggest involvement of other pathways in central pain development (111; 79).
The pattern of central pain correlates with the site of the lesion. Ventroposterior thalamic nuclear lesions are more likely to produce half-body pain. The supratentorial lesions cause most severe pain in an extremity, whereas the infratentorial lesions are in the face (12). Imaging injured spinothalamic strokes may be achieved with diffusion tensor tractography (62).
There is lack of high-quality clinical trials of central pain treatment. Post-stroke pain can be resistant to standard use of analgesics and opioids.
Amitriptyline has been effective in a small, randomized controlled study (92); however, there is a need for more data (112).
Pregabalin is effective at escalating doses of 150, 300, and 600 mg/day (170). In addition, it may improve pain-related anxiety and sleep disturbances (82).
Carbamazepine is probably effective for chronic neuropathic pain, but there is a lack of information beyond 4 weeks (177). The effect of gabapentin on neuropathic pain is probably not superior to carbamazepine (175).
Lamotrigine in a dose of 200 mg daily was moderately effective in a small randomized study (168), but a Cochrane review provided no convincing evidence of benefit at doses of 200 to 400 mg/day. In addition, its titration is difficult because of risk for rash (176). Levetiracetam is not effective for post-stroke pain treatment (68; 178).
Intravenous lidocaine and morphine have a limited role in treating central pain due to the delivery method and side-effects (04). Intrathecal baclofen improved central post-stroke pain in a small case series (158). Fluvoxamine and mexiletine may also be used as adjuvants for pain treatment (81). Botulinum toxin, BTX-A, has been used with some success for neuropathic pain; however, a clinical trial is needed to confirm the initial results (61).
Graded motor imagery, like limb laterality recognition, imagined movements, mirror movements, and mirror therapy may improve pain and function in patients with phantom limb and complex regional pain syndrome type 1 (113; 161). For multimodal physiotherapy, electrotherapy, and manual lymphatic drainage, the evidence is absent or of very low quality (152).
The cold caloric stimulation can rapidly relieve thalamic pain (142; 106; 107). Refractory thalamic pain was successfully treated by stellate ganglion block (97). In one case report, ultrasound guided block of the stellate ganglion with lidocaine had a lasting effect at 9 months (100).
Repetitive transcranial magnetic stimulation (rTMS) is a potentially useful noninvasive method for pain control (93). Fiber tracking with diffusion tensor imaging may predict response to rTMS (50). However, there is a significant publication bias (38). A systematic review of transcranial direct current stimulation (tDCS) on neuropathic pain in patients with stroke shows promise, but there is high heterogeneity (35; 143). rTMS may control chronic as well as acute pain after stroke (94; 103).
Motor cortex stimulation was used successfully for intractable central pain. The motor prefrontal cortex is preferred because the procedure is less invasive, achieves better pain control (48% vs. 25% for deep brain stimulation vs. 7% for spinal cord stimulation), and is less likely to trigger painful sensations (75). Motor cortex stimulation is also useful for painful brainstem and spinal cord lesions (159). Pain relief may persist at 12-month follow-up (154; 167). Long-term, over 80% reduction in pain was seen in 31% of patients, 50% to 80% reduction in 23% of patients, and no improvement in 15% of patients (153). Epidural hematoma and subdural effusion are potential complications of this procedure. The mechanism of motor cortex stimulation is thought to be increasing of regional cerebral blood flow to the ipsilateral corticothalamic connections (17) or anti-inflammatory effects of stimulation (148).
For nonthalamic lesion, spinal cord stimulation achieved relief for more than 12 months in 44.4% of patients (160). Other useful locations for electrical stimulation include periventricular grey matter (116; 137) and the centromedian thalamic nucleus (02).
The data on neurosurgical management of central post-stroke pain are limited, and further studies are needed to confirm these findings (34; 46).
Shoulder pain. Shoulder pain occurs in 22% of patients within the first 4 months of the first stroke. Seventy-nine percent of these patients have moderate to severe pain. Loss of motor function and a high NIHSS score correlate with development of shoulder pain. Shoulder pain limits daily functioning and the rehabilitation process (99). A retrospective study of 786 patients with stroke shows a decrease of shoulder pain frequency over the last 15 years, suggesting an improvement of both stroke and rehabilitation therapies (108).
Shoulder pain after stroke may be caused by shoulder subluxation, proximal arm spasticity, local traumatic injury, shoulder-hand syndrome, and complex regional pain syndrome. The severity of paralysis and its stage (flaccid or spastic) alter the anatomy of the shoulder joint differently and determine the type of shoulder pain (165). It is unclear why pain resolves spontaneously in some patients but not in others. A study of 16 patients with shoulder pain revealed decreased adaptation to pain compared to a group of 14 patients with similar functional status but without shoulder pain (74).
Shoulder subluxation. Shoulder subluxation may result from the inferior displacement of the paretic arm (165). Glenohumeral subluxation was present in nearly 50% of patients in a case-control study of 107 hemiplegic adults with stroke within 30 days (125).
Subluxation is diagnosed by palpation, plain radiographs of the shoulder, or ultrasonography (130). Positioning and special attention to the weak limb is important in preventing subluxation, especially in those dependent on transfers for mobility (171). Support slings have been used to reduce shoulder subluxation with mixed results (124). Multiple support slings have been used to reduce shoulder subluxation with mixed results (124). One study showed that the level of subluxation decreased in patients who did not use a sling and that wearing of an arm sling may impair this correction (166). Observational studies suggest that shoulder orthoses reduce vertical subluxation and pain (115).
Electrical stimulation of the shoulder successfully prevented and treated subluxation by maintaining muscle bulk and tone and by enhancing functional recovery through cortical feedback. Long-term follow-up was limited, however (165). A small, randomized pilot study failed to demonstrate additional benefit of kinesio-tape or neuromuscular electric stimulation (NEMS) to conventional therapy alone, which consisted of careful shoulder handling and daily mobilization (59).
Intramuscular electrical stimulation in 61 chronic stroke survivors with shoulder pain and subluxation significantly reduced pain levels. The effect was maintained at 12-month follow-up (22). A small single-blinded randomized trial showed better pain control with EMG-triggered neuromuscular electric stimulation compared to transcutaneous electrical nerve stimulation (TENS), both immediately and at 1-month follow-up (28). In a small case series of 5 selected patients, a fully implantable peripheral nerve stimulator was found to be safe and significantly reduced shoulder pain at 12-month follow-up (180).
A systematic review of neuromuscular electric stimulation showed reduction of shoulder subluxation in the acute and subacute phase but not in the chronic stroke or reduction of shoulder pain (91).
Spasticity. Spasticity of the shoulder following stroke is often painful and limits the range of motion. There is adduction and medial rotation of the arm associated with flexion at the elbow, wrist, and fingers. Different treatments have been employed, including medication for pain and spasticity, treatment of capsulitis, surgical release with transaction of the subscapularis tendon, and local botulinum toxin A injections.
Botulinum toxin type A injection in the pectoralis major reduced pain caused by spasticity in the first week after stroke in a double-blind, randomized clinical trial of 31 patients (104). Subscapularis muscle is another useful site for injection (181). However, botulinum toxin is not indicated for nonspastic causes of shoulder pain (84). Moreover, a meta-analysis of 950 patients showed that overall effectiveness of botulinum toxin type A does not seem to differ from placebo for post-stroke patients with upper limb spasticity (63).
Other promising therapeutic modalities include repetitive transcranial magnetic stimulation (27), suprascapular nerve block (136), modified wheelchair arm support (127), and extracorporeal shock wave therapy (64).
Frozen shoulder. Frozen shoulder, or adhesive capsulitis, caused by recurrent local injuries, is characterized by shoulder pain and limited motion in all directions. It is diagnosed by contrast enhanced arthrograms in 50% of hemiplegic patients with shoulder pain. It is often associated with rotator cuff tear (102).
Shoulder-hand syndrome. This is a form of complex regional pain syndrome in the arm after stroke characterized by severe shoulder pain, metacarpophalangeal joint tenderness, hand edema, changes in skin color and temperature, dysautonomia with excessive sweating, and hyperesthesia. Atrophy of skin and muscles of the shoulder and hand with sparring of the elbow often follows. The mechanism is probably central and peripheral sensitization due to stroke (135), but involvement of the sympathetic system has not been demonstrated. Furthermore, shoulder subluxation and peripheral nerve damage increase the likelihood of developing complex regional pain syndrome (47).
The diagnosis of complex regional pain syndrome is primarily clinical. Bone scintigraphy may show increased periarticular uptake, particularly at the shoulder and wrist (52), and decreased bone mineral density in the paretic limb when compared to matched healthy controls (86).
Preventative measures consist of avoidance of shoulder trauma. Treatment consists physical therapy and pain management. Mirror therapy may reduce pain and improves the function of the upper limb (20).
Severe sympathetic dysfunction may benefit from regional block, although strong evidence is lacking. Investigations into neuromodulation through spinal cord stimulation and administration of intrathecal analgesia have been undertaken in patients with complex regional pain syndrome (86).
Two systematic reviews of acupuncture found several heavily biased studies, suggesting the need for further randomized clinical studies (24; 132).
Heterotopic ossification. Heterotopic ossification of the soft tissue of the paretic limb contributes to post-stroke pain and dysfunction (123). Calcification may also occur in the nonparetic limb (83; 54).
Urinary incontinence. Urinary incontinence within the first 7 days of stroke was noted in 53% of patients. One third of these patients remained incontinent at 12-month follow-up. Furthermore, those who were incontinent in the acute phase were 4 times more likely to be institutionalized after 1 year and a predictor of death (65).
Post-stroke urinary incontinence can be described based on etiology (156):
(1) Urge urinary incontinence: urgency followed by involuntary leakage that can result from a lesion of the central micturition pathways.
(2) Functional urinary incontinence: inability to achieve self-toileting due to impaired mobility from stroke.
(3) Stress urinary incontinence: involuntary leakage on effort such as coughing. This is usually present prior to stroke onset but is exacerbated by coughing associated with dysphagia and aspiration.
There are insufficient data from clinical trials to guide continence care in patients with stroke (163). Management of urinary incontinence after stroke is like that of the general population. Treatment begins with behavioral interventions like timed voiding, prompted voiding, bladder retraining with urge suppression, and pelvic floor muscle retraining and compensatory rehabilitation approaches (39). Pharmacological treatment and urologic consultation with surgical intervention may be necessary.
All contributors' financial relationships have been reviewed and mitigated to ensure that this and every other article is free from commercial bias.
Adrian Marchidann MD
Dr. Marchidann of Kings County Hospital has no relevant financial relationships to disclose.See Profile
Steven R Levine MD
Dr. Levine of the SUNY Health Science Center at Brooklyn has no relevant financial relationships to disclose.See Profile
Nearly 3,000 illustrations, including video clips of neurologic disorders.
Every article is reviewed by our esteemed Editorial Board for accuracy and currency.
Full spectrum of neurology in 1,200 comprehensive articles.
Listen to MedLink on the go with Audio versions of each article.
Nov. 28, 2022
General Child Neurology
Nov. 21, 2022
Stroke & Vascular Disorders
Nov. 06, 2022
Stroke & Vascular Disorders
Oct. 25, 2022
Stroke & Vascular Disorders
Oct. 18, 2022
Stroke & Vascular Disorders
Sep. 29, 2022
Stroke & Vascular Disorders
Sep. 29, 2022
Stroke & Vascular Disorders
Sep. 29, 2022