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PubMed2003

Minimally invasive orbital decompression for Graves' ophthalmopathy.

We reviewed a 7-year experience at a tertiary-care, academic medical center with balanced, minimally invasive decompression for Graves' ophthalmopathy, in an effort to define the goals, risks, and outcomes of surgical intervention. Endoscopic medial decompression was performed in 26 patients; 23 underwent lateral decompression as well, and 13 also had inferior decompression. Septoplasty, turbinate reduction, and orbital rim augmentation were performed as needed. The indications for surgery were threat to vision (n = 10) and proptosis with a desire to return to the predisease state (rehabilitative, n = 16). The exophthalmos improved by a mean of 4.4 mm (p < .001). All patients who had surgery for threatened vision had improved vision after the operation. There were 3 patients with new-onset postoperative diplopia, 2 of whom underwent strabismus surgery. There was 1 case of postoperative sinusitis, which resolved with oral antibiotics and nasal decongestion, and 1 case of transient ulnar neuropathy. There were no other intraoperative or postoperative complications. Modern methods of orbital decompression provide a minimally invasive, effective, and relatively safe approach to the treatment of Graves' ophthalmopathy.

Adult↗
PubMed2004

Evaluating the effect of decompression surgery on cerebrospinal fluid flow and intracranial compliance in patients with chiari malformation with magnetic resonance imaging flow studies.

OBJECTIVE: To quantify the effect of decompression surgery on craniocervical junction hydrodynamics and on global intracranial compliance (ICC) in patients with Chiari I malformation by use of magnetic resonance measurements of cerebrospinal fluid and blood flow. Studying the effect of decompression surgery may improve our understanding of the pathophysiological characteristics of Chiari I malformation and aid in identifying patients who will benefit from the procedure. METHODS: Twelve patients were studied with a 1.5-T magnetic resonance imaging scanner before and after decompression surgery. Cine phase contrast magnetic resonance images were used to quantify maximum cord displacement, maximum systolic cerebrospinal fluid velocity and volumetric flow rate, and overall ICC. ICC was derived by use of a previously reported method that measures small changes in intracranial volume and pressure that occur naturally with each cardiac cycle. RESULTS: After surgery, changes were documented both in the local hydrodynamic parameters and in ICC. However, only the change in ICC, an average increase of more than 60%, was statistically significant. Increased ICC, which was associated with improved outcome, was measured in 10 of the 12 patients, no significant change was documented in 1 patient, and decreased ICC was measured in 1 patient whose symptoms persisted after surgery. CONCLUSION: An increase in the overall compliance of the intracranial compartment is the most significant and consistent change measured after decompression surgery. Changes in cord displacement, cerebrospinal fluid velocities, and flow in the craniospinal junction were less consistent and less affected by the operation. Thus, ICC may play an important role in the outcome of decompression surgery related to improving symptoms and restoring normal neurological hydrodynamics in patients with Chiari I malformations.

Adult↗
PubMed2005

Decompressive hemicraniectomy for poor-grade aneurysmal subarachnoid hemorrhage patients with associated intracerebral hemorrhage: clinical outcome and quality of life assessment.

OBJECTIVE: Decompressive hemicraniectomy has been proposed as a potential treatment strategy in patients with poor-grade aneurysmal subarachnoid hemorrhage presenting with focal intracerebral hemorrhage causing significant mass effect. Although hemicraniectomy improves overall survival rates, the long-term quality of life (QoL) for survivors in this patient population has not been reported. METHODS: Using adjudicated outcome assessments, we compare long-term clinical outcomes and QoL between a group of patients with poor-grade aneurysmal subarachnoid hemorrhage receiving decompressive hemicraniectomy (n=12) and a control group of similar patients managed more conservatively (n=10). RESULTS: Patients receiving decompressive hemicraniectomy experienced a statistically insignificant decrease in short-term mortality compared with controls (25 versus 42%); however, long-term QoL in hemicraniectomy survivors was generally poor. Furthermore, hemicraniectomy patients did not experience an increase in mean quality-adjusted life years over control patients (2.31 versus 2.22 yr). CONCLUSION: Decompressive hemicraniectomy prolongs short-term survival in patients with poor-grade aneurysmal subarachnoid hemorrhage with associated intracerebral hemorrhage; however, this trend is not statistically significant, and the overall QoL experienced by survivors is poor. Decompressive hemicraniectomy may be indicated if performed early in a select subset of patients. On the basis of our preliminary data, large prospective studies to investigate this issue further may not be warranted.

Adult↗
PubMed2006

Relationship of cine phase-contrast magnetic resonance imaging with outcome after decompression for Chiari I malformations.

OBJECTIVE: Many patients with symptomatic Chiari I malformations experience symptom recurrence after surgical decompression. Identification of predictors of outcome is needed to better select patients most likely to benefit from surgical intervention. We examined whether or not cerebrospinal fluid (CSF) flow dynamics assessed by cine phase contrast magnetic resonance imaging could independently predict response to posterior fossa decompression for Chiari I malformations. METHODS: Pre- and postoperative CSF flow dynamics were assessed by cine phase-contrast magnetic resonance imaging in 130 consecutive patients receiving posterior fossa decompression for a Chiari I malformation between 1997 and 2003. CSF flow was classified as "abnormal" if biphasic flow was either absent or decreased through the aqueduct, fourth ventricle and its outlets, the foramen magnum, or ventral or dorsal to the cervical spinal cord. If no evidence of decreased flow was noted, CSF flow was classified as "normal." The association between preoperative CSF flow dynamics, all recorded variables, and long-term outcome was assessed using multivariate proportional hazards regression analysis. RESULTS: All patients had tonsil herniation more than 5 mm below the foramen magnum (average, 11 +/- 5 mm). Abnormal hindbrain CSF flow was observed in 81% of patients (43% complete obstruction, 38% reduced flow). Normal CSF flow was observed in 19% of patients. In multivariate analysis, patients with normal preoperative hindbrain CSF flow were 4.8-fold more likely to experience symptom recurrence after surgery (relative risk, 4.85; 95% confidence interval, 1.88-12.5; P < 0.001) regardless of degree of tonsillar ectopia or presence of syringomyelia. Isolated frontal headache (relative risk, 4.16; 95% confidence interval, 1.7-9.8; P < 0.05) and scoliosis (relative risk, 9.2; 95% confidence interval, 1.7-10.5; P < 0.001) also were independent risk factors for symptom recurrence. CONCLUSION: Normal preoperative hindbrain CSF flow was an independent risk factor for treatment failure after decompression for Chiari I malformation regardless of the degree of tonsillar ectopia. Cine phase-contrast magnetic resonance imaging may be a valuable tool in identifying patients who are less likely to respond to surgical decompression for Chiari I malformation.

Adolescent↗
PubMed1976

Inner ear decompression sickness.

With recent increases in commercial, military, and sport diving to deeper depths, inner ear injuries during such exposures have been encountered more frequently and noted during several phases of diving: during compression, at stable deep depths, with excessive noise exposure in diving, and during decompression. The pathophysiology of these injuries differs, depending upon the phase of diving in which the injuries occur. In this report, 23 cases of hearing loss, tinnitus, and/or vertigo occurring during or shortly after decompression are presented. Thirteen of these cases occurred in helium-oxygen dives involving a change to air during the latter stages of decompression. A significant correlation is present between prompt recompression treatment, relief of symptoms, and lack of residual deficits. Current knowledge indicates that the management of otologic decompression sickness should include: 1. prompt recompression to at least 99 feet deeper than the symptom onset depth; 2. recompression using the previous helium-oxygen mixture when the injuries occur during or shortly after a switch from helium-oxygen to air during the latter stages of decompression; 3. the use of parenteral diazepam for symptom relief and cyclic inhalations of oxygen enriched treatment gases; and 4. the avoidance of further diving by divers who exhibit permanent inner ear injuries after the acute symptoms have subsided.

Adult↗
PubMed2005

[A comparative study between the results of antro-ethmoidal orbital decompression isolated and associated with orbital fat removal].

PURPOSE: To compare the results of isolated antral-ethmoidal orbital decompression and that associated with orbital fat removal in patients with dysthyroid orbitopathy. METHODS: Nineteen isolated antral-ethmoidal orbital decompressions were performed in a group of 12 patients (19 orbits) with the diagnosis of dysthyroid ophthalmopathy in the quiescent stage. The same procedure, but in association with orbital fat removal, were performed in another group of 8 patients (10 orbits) also with the diagnosis of dysthyroid ophthalmopathy in the quiescent stage. The results of both groups were compared. RESULTS: In the first group the amount of retroplacement of the globe achieved 1-5 mm (mean 3.68+/-1.10 mm) and in the second group it achieved 1-5 mm (mean 3.25+/-1.36 mm). CONCLUSIONS: There was no significant difference between the results of the isolated antral-ethmoidal orbital decompression and that associated with orbital fat removal. The removal of 1 ml of seems not to improve the retroplacement of the globe as an association with a 2-wall orbital decompression. However, many conditions must be considered to conclude any comparison between the two orbital decompression techniques, such as orbital soft tissue compliance, amount of fat removal and size of bone opening.

Adipose Tissue↗
PubMed2004

Transcranial doppler sonography in two patients who underwent decompressive craniectomy for traumatic brain swelling: report of two cases.

The role of decompressive craniectomy in the treatment of severe posttraumatic cerebral swelling remains quite a controversial issue. To the best of our knowledge, there is no study demonstrating the effect of decompressive craniectomy on cerebral blood flow (CBF) velocity by means of transcranial Doppler sonography (TCD). We present two patients who developed traumatic brain swelling and uncontrollable intracranial hypertension with coma and signs of transtentorial herniation. One patient underwent bifrontal, while the second, unilateral, frontotemporoparietal decompressive craniectomy with dural expansion. In both patients, TCD examinations were performed immediately before and after surgery to study the cerebral hemodynamic changes related to the operations. Pre and postoperative TCD examinations demonstrated a significant increase in blood flow velocity in the intracranial arteries in both subjects. In conclusion, our cases suggest that decompressive craniectomy with dural expansion may result in elevation of CBF velocity in patients with massive brain swelling. The increase in CBF velocity appears to occur not only in the decompressed hemisphere, but also on the opposite side.

Adult↗
PubMed2000

Treatment of posttraumatic syringomyelia with extradural decompressive surgery.

The authors review the management of five patients with posttraumatic syringomyelia (PTS) associated with an uncorrected spinal deformity. Patients with evidence of progressive neurological deterioration underwent ventral spinal decompressive surgery. The mean patient age at the time of injury was 39 years, and the time between injury and the diagnosis of PTS ranged from 2 to 22 years. Mechanisms of injury consisted of fracture/subluxations in three patients and burst fractures in two. All patients experienced delayed neurological deterioration consistent with PTS. Magnetic resonance imaging revealed ventral deformities, and the spinal canal stenosis ranged from 20 to 50% (mean 39%). All patients underwent ventral epidural spinal decompressive surgery to correct the bone deformity and restore the spinal canal. The mean follow-up period was 38 months. The decompressive intervention was initially successful in treating the neurological deterioration in all patients. Symptoms resolved completely in four patients, and the other experienced neurological improvement. Postoperative magnetic resonance imaging revealed a reduction in the size of syrinx cavity in the patients whose symptoms resolved and no change in the remaining patient. Two patients required a subsequent second-stage posterior intradural exploration and duraplasty for recurrence of symptoms and/or syrinx. Posttraumatic spinal deformity may cause spinal canal stenosis and alter subarachnoid cerebrospinal fluid (CSF) flow in certain patients. Ventral epidural spinal decompressive surgery may result in neurological improvement and a reduction of the syrinx cavity, avoiding the need for placement of a shunt or other intradural procedures. However, some patients will also require reconstruction of the posterior subarachnoid space with duraplasty if the ventral decompressive procedure achieves only partial restoration of the subarachnoid CSF flow.

Adult↗
PubMed2002

Bilateral decompressive surgery in lumbar spinal stenosis associated with spondylolisthesis: unilateral approach and use of a microscope and tubular retractor system.

OBJECT: The objective of this study was to assess the feasibility and efficacy of treating spondylolisthesis-related spinal stenosis via unilateral approach bilateral decompression in which METRx-MD instrumentation is placed. METHODS: Eight consecutive patients with spinal stenosis underwent bilateral decompressions via a unilateral approach in which METRx-MD instrumentation was placed. The procedures were performed on an outpatient basis after induction of general anesthesia. The patients underwent preoperative and 3-month postoperative plain radiography in which flexion-extension x-ray films were obtained. Preoperative and postoperative magnetic resonance imaging was also performed. All radiographs and neuroimages were read by a single radiologist blinded to the clinical results. Eight vertebral levels in the eight patients were surgically decompressed (in one patient an additional level of nonspondylolisthesis-related stenosis was decompressed). The mean operative time was 92 minutes and the mean blood loss was 33 ml/level. Preoperatively stenosis was severe in five patients, moderate/severe in two, and moderate in one; postoperatively stenosis was absent in five, mild in two, and mild/moderate in one. Motion was detected on flexion-extension radiographs in three patients, but on early (3-month) postoperative radiographs there was no evidence of progression. CONCLUSIONS: By following the authors' procedure, minimally invasive bilateral decompression of acquired spinal stenosis associated with spondylolisthesis can be successfully performed on an outpatient basis, with reasonable operative times, minimal blood loss, and acceptable morbidity.

Aged↗
PubMed2003

Intraoperative cervical epidurography: a simple modality for assessing the adequacy of decompression during anterior cervical procedures. Technical note.

OBJECT: Intraoperative cervical epidurography (ICE) was used during anterior cervical procedures to assess the success of bone resection and indicate the need for immediate correction in the event of inadequate decompression. METHODS: The adequacy of decompression was assessed by the operating neurosurgeon who performed ICE after anterior microdiscectomy with exposure of the dura mater. If the decompression was deemed inadequate, additional bone was removed using a high-speed drill. Epidurography was conducted after each subsequent decompression until adequate bone removal was achieved. This was undertaken in 39 patients undergoing anterior cervical procedures. Nine patients underwent corpectomy, 21 one-level, and nine two-level discectomy. The ICE revealed insufficient resections requiring additional bone removal in 14 (36%) of the 39 patients. CONCLUSIONS: The goal of ICE is to ensure adequate decompression, and if such has not been achieved, to allow for additional immediate bone excision. Furthermore, ICE provides additional real-time control of the position of cages and screws to avoid dural tear or spinal cord compression. Because of this immediate feedback, the success rate of anterior cervical procedures can be improved. The advantages of this modality include real-time assessment, low cost, simplicity, and speed.

Decompression, Surgical↗
PubMed2004

Prospective outcomes evaluation after decompression with or without instrumented fusion for lumbar stenosis and degenerative Grade I spondylolisthesis.

OBJECT: There is considerable debate among spine surgeons regarding whether fusion should be used to augment decompressive surgery in patients with symptomatic lumbar spinal stenosis involving Grade I degenerative spondylolisthesis. The authors prospectively evaluated the outcomes of patients treated between 2000 and 2002 at two institutions to determine whether fusion improves functional outcome 1 year after surgery. METHODS: Patients ranged in age from 50 to 81 years. They presented with degenerative Grade I (3- to 14-mm) spondylolisthesis and lumbar stenosis without gross instability (< 3 mm of motion at the level of subluxation). Those in whom previous surgery had been performed at the level of subluxation were excluded. Each patient completed Oswestry Disability Index (ODI) and Short Form-36 (SF-36) questionnaires preoperatively and at 6 to 12 months postoperatively. Some patients underwent decompression alone (20 cases), whereas others underwent decompression and posterolateral instrumentation-assisted fusion (14 cases), at the treating surgeon's discretion. Baseline demographic data, radiographic features, and ODI and SF-36 scores were similar in both groups. The 1-year fusion rate was 93%. Both forms of surgery independently improved outcome compared with baseline status, based on ODI and SF-36 physical component summary (PCS) results (p < 0.001). Decompression combined with fusion led to an improvement in ODI scores of 27.5 points, whereas decompression alone was associated with a 13.6-point increase (p = 0.02). Analysis of the SF-36 PCS data also demonstrated a significant intergroup difference (p = 0.003). CONCLUSIONS: Surgery substantially improved 1-year outcomes based on established outcomes instruments in patients with Grade I spondylolisthesis and stenosis. Fusion was associated with greater functional improvement.

Aged↗
PubMed2006

Chimney sublaminar decompression for degenerative lumbar spinal stenosis.

OBJECT: The authors evaluated the efficacy and safety of so-called chimney sublaminar decompression, a new technique to decompress the degenerative stenotic lumbar spinal canal without stripping of the paravertebral muscles. METHODS: Eighteen patients (nine men and nine women whose mean age was 67 years) with symptoms of claudication were selected to undergo chimney sublaminar decompression. The duration of symptoms was greater than 6 months in 17 patients. Two lumbar segments were involved in seven patients, three in eight, and four in the remaining three patients. Central canal stenosis was present in 13 patients, and lateral recess stenosis in five patients. Mild spondylolisthesis was noted in seven patients. All the patients underwent chimney sublaminar decompression. After surgery, mild wound pain developed in 14 patients, moderate wound pain in two, and severe wound pain in two. The postoperative hospital stay was 4 days or fewer in 14 patients. At follow-up examination, excellent, good, and fair outcomes were achieved in 11, five, and two patients, respectively. No patient required a body brace, and no worsening of preexisting spondylolisthesis was detected. The spinal canal was increased to two- to 6.8-fold (mean 4.2-fold) the preoperative size. CONCLUSIONS: Compared with laminectomy or endoscopic surgery, the aforementioned chimney sublaminar decompression technique was an equally effective and less invasive technique in the treatment of degenerative lumbar canal stenosis.

Aged↗
PubMed2000

Core decompression and conservative treatment for avascular necrosis of the femoral head: a meta-analysis.

Core decompression for avascular necrosis (AVN) of the femoral head continues to be a controversial procedure. Meta-analysis techniques were employed to identify 22 studies with a single surgical core decompression technique. A similar procedure identified eight studies that treated patients conservatively. The success rates for core decompression were 84%, 63%, and 29% for Steinberg stages I, II, and III, respectively. Conservatively treated patients with stage 0, I, III, and III AVN demonstrated success rates of 86%, 61%, 59%, and 25%, respectively. Chi-square analysis showed the success rate of core decompression to be statistically higher than conservative treatment for stage I hips only. Large multicenter prospective double-blinded studies with patients randomized to either core decompression or conservative treatment, then stratified by stage, cause, and bilaterality, are needed to determine the best treatment for early-stage AVN.

Adult↗
PubMed2000

Transnasal endoscopic orbital decompression and Graves' ophtalmopathy.

AIM OF THE STUDY: To assess the validity and the limits of endoscopic endonasal orbital decompression for Graves' ophtalmopathy resistant to the medical theapy. MATERIAL AND PATIENTS: Between September 1994 and May 1998, 16 patients with Graves' ophtalmopathy resistant to the medical treatment underwent an orbital decompression transnasally. 27 orbits were decompressed. The surgery was bilateral in 11 patients. In the 5 remaining cases, the surgery was unilateral. It was carried out on the left side in 2 cases and on the right side in 3 cases. RESULTS: Preoperatively, the average visual acuity was 8/10. Postoperatively, the visual acuity was 9.5/10. The average preoperative exophtalmometry measurement was 25.04 mm and the average postoperative measurement was 21.83 mm. The average retrodisplacement was 3.17 mm (range: 2-8). Preoperatively, 3 patients had mild diplopia whereas 5 others had moderate to severe extraocular muscle dysfunction. Postoperatively, 6 patients had mild diplopia whereas 10 patients required squint surgery for moderate to severe extraocular muscle dysfunction. CONCLUSION: Endoscopic orbital decompression improve all the symptoms of Graves' ophtalmopathy but one: the extraocular muscle dysfunction. Its cardinal indication is the treatment of compressive optic neuropathy whereas this surgical approach provides an excellent control of the medial wall of the orbit and the orbital apex. But the average reduction of proptosis of 3.17 mm is not high enough to propose this approach alone for the treatment of disfiguring proptosis. In such cases, a 2 or 3 wall orbital decompression should be performed to get marked cosmetic and functional improvement. In all cases, the patient should be informed about the risk of postoperative diplopia.

Adult↗
PubMedDate not supplied

[Microvascular decompression of trigeminal neuralgia caused by vertebrobasilar dolichoectasia].

INTRODUCTION: Trigeminal neuralgia due to vertebrobasilar dolichoectasia is an acquired disease whose true incidence is not known. Microvascular decompression is the most effective technique both for symptomatic relief and for the conservation of nerve structure and function, in spite of the potential complications of all major surgery. In cases which are drug-resistant and have a life expectancy of over five years, microvascular decompression may be done using several techniques. CLINICAL CASES: We present three cases with drug-resistant trigeminal neuralgia. One patient had a history of previous cerebrovascular ischaemia, another had arterial and pulmonary hypertension. In all cases vertebrobasilar dolichoectasia was seen on magnetic resonance. Microvascular decompression of the trigeminal nerve was done, placing pieces of Teflon between the tentorium and the artery to displace it. Postoperatively the pain disappeared in two cases and was much relieved in the other, making good progress with no complications. CONCLUSIONS: Trigeminal neuralgia due to vertebrobasilar dolichoectasia is a progressive acquired disease. The imaging technique of choice is magnetic resonance. Cerebral angiography may be useful for confirmation. This new technique of microvascular decompression avoids excessive manipulation of the ectatic, arteriosclerotic basilar artery and also pulsatile compression, so that the risk of secondary effects is reduced and the efficacy of the decompression maintained. Further cases are needed to confirm the usefulness of this technique.

Aged↗
PubMed2001

Endoscopic optic nerve decompression for the treatment of traumatic optic neuropathy.

Optic nerve decompression has been accomplished by a variety of procedures. Since 1995, endoscopic optic nerve decompression (EOND) has been used to treat traumatic optic neuropathy (TON) patients in our hospital after medical treatment failed. To date, 17 TON patients have received EOND in our hospital and have been followed up for more than half a year. After decompression, vision improved in 9 patients, remained the same in 6, and became worse in 2. The dura was incidentally exposed during the operation in 1 patient. We conclude that it is easier and more precise to perform optic nerve decompression by EOND than by other optic nerve decompression procedures. However, its efficacy still needs further investigation.

Adolescent↗
PubMed1999

[Study on testing method of susceptibility to decompression sickness in aerospace].

Objective. To provide related parameters for astronauts. Method. A study of susceptibility to decompression sickness was carried out in 43 subjects in a hypobaric chamber. Result. Incidence of altitude decompression sickness under rest condition was closely related to age, time of oxygen prebreathing, gas bubble formation rates in the venous blood flow returned to heart and some other physiological indexes. Incidence of decompression sickness was significantly higher in subjects aged 30-36 years than in those aged 19-20 years under the same experimental conditions. In the older subjects body-fat, blood cholesterole and noradrenaline in urine during experiment were significantly higher than those in the younger subjects. It also showed that among persons of the same ages, when prebreathing time was longer, the incidence of decompression sickness was significantly lower under the same experimental conditions. Conclusion. It is desirable that the susceptibility to decompression in astronaut be tested with 1 h oxygen prebreathing before exposure to the altitude of 10000 m for 30 min.

Adult↗
PubMed2002

Microendoscopic decompressive laminotomy for the treatment of lumbar stenosis.

OBJECTIVE: By modifying existing microendoscopic discectomy techniques, we previously developed a novel surgical treatment of lumbar stenosis and validated its ability to achieve a thorough decompression in a cadaveric study. We now describe our clinical experience with this new, minimally invasive microendoscopic decompressive laminotomy (MEDL) technique. METHODS: A MEDL was performed in 25 patients with classic features of lumbar stenosis. By use of a fluoroscopically guided percutaneous technique, the working portal was docked on the lamina with minimal soft-tissue injury. With the angle of the endoscope combined with an oblique entry, a bilateral bony and ligamentous decompression was achieved under the midline, thereby preserving the supraspinous-interspinous ligaments and contralateral musculature. A second group of 25 patients treated with open decompression was used for comparison. RESULTS: Effective circumferential decompression was achieved in the majority of patients. The results for the MEDL group were as follows: operative time, 109 minutes per single level; blood loss, 68 ml; and postoperative stay, 42 hours. The results for the open-surgery group were as follows: operative time, 88 minutes; blood loss, 193 ml; and postoperative stay, 94 hours. The MEDL group needed significantly less narcotic medication after surgery. Overall, 16% of the MEDL patients reported resolution of their back pain, 68% improved symptomatically, and 16% remained unchanged. The outcome of the open group was very similar. CONCLUSION: Compared with an equivalent open technique, MEDL appears to offer a similar short-term clinical outcome with a significant reduction in operative blood loss, postoperative stay, and use of narcotics. This lower surgical stress, decreased tissue trauma, and quicker recovery are particularly important in this elderly population of patients.

Adult↗