The failure of subcategorization of cauda equina syndrome.

The diagnostic sub-categorization of cauda equina syndrome (CES) is used to aid communication between doctors and other healthcare professionals. It is also used to determine the need for, and urgency of, MRI and surgery in these patients. A recent paper by Hoeritzauer et al (2023) in this journal examined the interobserver reliability of the widely accepted subcategories in 100 patients with cauda equina syndrome. They found that there is no useful interobserver agreement for the subcategories, even for experienced spinal surgeons. This observation is supported by the largest prospective study of the treatment of cauda equina syndrome in the UK by Woodfield et al (2023). If the accepted subcategories are unreliable, they cannot be used in the way that they are currently, and they should be revised or abandoned. This paper presents a reassessment of the diagnostic and prognostic subcategories of cauda equina syndrome in the light of this evidence, with a suggested cure based on a more inclusive synthesis of symptoms, signs, bladder ultrasound scan results, and pre-intervention urinary catheterization. This paper presents a reassessment of the diagnostic and prognostic subcategories of CES the light of this evidence, with a suggested cure based on a more inclusive synthesis of symptoms, signs, bladder ultrasound scan results, and pre-intervention urinary catheterization.

Failed consent in spinal surgery again. Minimum standards for consent must be adopted by all surgeons.

AIM: To report another case of failed consent in spinal surgery leading to an award in damages of £4.4 million and to suggest an improved method of recording discussions in respect of consent. METHODS: A recent Court Judgment, previous Judgments and the relevant medical law were reviewed. RESULTS: A standardised proforma recording the necessary preoperative discussions that must be had with our patients is described. CONCLUSIONS: Spinal surgeons must adhere to new standards in respect of the consenting process and, crucially, in recording the dialogue that has occurred between the patient and the surgeon.

Quantifying the clinical aspects of the cauda equina syndrome - The Cauda Scale (TCS).

AIM: To quantify the clinical findings in patients with potential cauda equina syndrome (CES). METHODS: Three domains were selected: bladder function (B), perianal sensation (S) and anal tone/squeeze (T). A quantified score was given to symptoms and signs in each domain. RESULTS: The lowest score in each domain and the lowest sum score (the most severe lesion) is 0. The best sum score is 9 (the normal patient). CONCLUSION: TCS can improve the clinical assessment and management of patients with possible CES and improve communication between the doctors who are called upon to assess and treat such patients.

Guidelines for cauda equina syndrome. Red flags and white flags. Systematic review and implications for triage.

INTRODUCTION: Patients with cauda equina syndrome (CES) are frequently referred late when neurological damage cannot be reversed. National Guidelines for emergency referral, imaging and treatment of CES contain symptoms and/or signs that are those of late often, irreversible CES. Referral at this stage may be too late for that patient. METHODS: Seven sources were reviewed. Advice re emergency referral/imaging/treatment were reviewed. Symptoms/signs were compared with a standard classification of CES. RESULTS: 37 recommendations: 12 (32%) were symptoms/signs of bilateral radiculopathy (treatment usually leads to favourable outcomes). Thirteen recommendations (35%) were described in an imprecise way (could be interpreted as early or late CES). Twelve sets of symptoms/signs (32%) were those of late, often irreversible CES where an unfavourable outcome would be expected. CONCLUSIONS: Thirty-two percent of the so-called "red flag" symptoms and signs of CES in seven sources were definitely those of late, irreversible CES. These could be seen as "white flags" [flags of defeat and surrender]. Thirty-five percent of the recommendations if interpreted pessimistically (e.g. absent perineal sensation or urinary incontinence) would also be white flags; potentially therefore two-thirds of the so-called "red flag" symptoms/signs of CES could be those of late irreversible CES. Only 32% of the symptoms/signs were true "red flags" i.e. they warn of further, avoidable damage ahead. Guidelines should be redrawn to emphasise referral of patients who are at risk of developing CES or who have early CES. It is illogical for these guidelines to emphasise the clinical features of severe, often untreatable, CES. Demand for emergency MRI will increase; MRI is part of triage and should be performed at the DGH.

Neurological deterioration in cauda equina syndrome is probably progressive and continuous. Implications for clinical management.

Fifty-six human and animal studies of cauda equina syndrome (CES) were reviewed. The evidence from human studies was poor (level IV). Evidence from animal studies and limited evidence from human studies suggest that structural and functional neurological losses are a progressive, continuous process. The longer the cauda equina nerve roots are compressed the greater the harm and the poorer the extent of recovery. This should prompt diagnosis and surgery for all CES patients as soon as practicably possible.

British Association of Spine Surgeons standards of care for cauda equina syndrome.

This group of articles looks at the BASS guidelines for CES. TG and AC gave us the background on the long journey taken in publishing this, SA summarized the forum discussion on the BASS Web site, and NT gave us a medicolegal comment. The guidelines are concise, highlighting the need for prompt MRI scanning and as a consequence emergency surgery in appropriate cases. This has resource implication in terms of MRI availability and a comprehensive spinal on-call system. The question of whether operating "in the small hours" carries increased risk or whether we are using this as an excuse not to get out of bed needs to be addressed. CES discs tend to be more difficult than standard ones and probably associated with a higher complication rate. Literature on complications from night-time trauma surgery has considerably reduced out-of-hour operating in trauma. Guidelines on CES will allow the spinal community to prospectively collect data on a national registry which in time will allow us to further improve our understanding and treatment of this condition. Spinal surgery is quickly evolving into a separate specialty. These guidelines further highlight the need for a single spinal society to help set standards, educate, and revalidate our members. It is important that we all engage in this debate to get a consensus opinion to improve spinal practice across the United Kingdom.

Medical negligence. Legal theory and neurosurgical practice: informed consent.

This article discusses the principles of the law in relation to informed consent as applied to neurosurgical practice. Patient autonomy, forms of consent, capacity to consent, the nature of information that should be given to patients, the level of information given, alternatives to treatment, which doctor should consent and when, consenting children, differing opinions, euthanasia and respect for the state of scientific knowledge are discussed.

Medical negligence. An overview of legal theory and neurosurgical practice: causation.

This article discusses the principles of the law in relation to legal causation as applied to neurosurgical practice. Causation is a causal link between a breach of duty of care and the final harm. The fundamental "but-for" test for causation will be discussed, together with Chester v Afshar modified causation, prospective and retrospective probabilities of harm, loss of a chance, causation following breach of duty of care by omission, breaking the chain of causation, material contribution and the law in relation to multiple defendants, with neurosurgical examples.

Medical negligence. An overview of legal theory and neurosurgical practice: duty of care.

A working knowledge of the legal principles of medical negligence is helpful to neurosurgeons. It helps them to act in a "reasonable, responsible and logical" manner, that is a practice that is consistent with the surgical practice of their peers. This article will review and explain the relevant medical law in relation to duty of care with illustrative neurosurgical cases.

Intra-operative MRI-assisted spinal localization.

BACKGROUND: Level localization in the thoracic spine can be problematic. We describe a new method that can be used in difficult cases, e.g., ones where lesions are mid-thoracic, small, or only visible on MRI. METHODS: Intra-operatively, a midline incision was made and the thoracic spinous processes were exposed. A length of contrast-filled tubing was wound around the processes and the incision was temporarily closed and the patient was transferred to the radiology department for MRI under general anesthetic. Upon return to theatre, the cross sections of contrast-filled tubing and the lesion itself were visible on the MRI scan, allowing localization of the level. FINDINGS: This method was accurate and minimized the extent of bone removal required for access. CONCLUSIONS: This technique, while not appropriate in every case, is repeatable, and does not require specialized equipment or training. It is an extremely accurate method of localization for difficult cases.

Retracing "Ondine's curse".

"Ondine's curse" is a term used to denote a rare neurological condition causing failure of automatic respiration. The patients are no longer capable of breathing spontaneously-they must consciously and voluntarily force themselves to do so. Ondine (also known as "Undine"), a mythological figure of European tradition, was a water nymph or sprite who could become human only when she fell in love with a mortal man. However, if the mortal was unfaithful to her, he was destined to forfeit his life. In the 16th century, Paracelsus coined the term "Undine" to describe the spirit that inhabited the element of water. Baron de la Motte-Fouque wrote the story of Undine in the late 18th century. It has since become a popular subject for theater productions. Jean Giraudoux, the French playwright, introduced the concept of the loss of automaticity of all functions as the "curse of Ondine." The legend was popularized in the form of the fairy tale "The Little Mermaid" by Hans Christian Andersen and as an animated motion picture by Walt Disney Productions. In this study, we look at the origins of this eponymous term, the personalities intertwined with its popularity, and its misrepresentations in the medical literature.

Surgical outcome in rheumatoid Ranawat Class IIIb myelopathy.

OBJECTIVE: Rheumatoid arthritis frequently affects the craniovertebral junction (CVJ) and may lead to severe neck pain, quadriparesis, and respiratory dysfunction. Surgery in rheumatoid nonambulatory (Ranawat Class IIIb) patients carries a significant risk. This study presents the surgical outcome of Class IIIb patients with CVJ rheumatoid myelopathy and reviews the literature. METHODS: One hundred twelve consecutive patients with rheumatoid cervical myelopathy underwent surgical decompression and stabilization. Thirty-two of the patients (mean age, 66.81 +/- 10.25 yr) with CVJ rheumatoid arthritis were in Class IIIb, and all had atlantoaxial subluxation. A halo brace was applied before surgery and continued during surgery. Eleven patients with reducible atlantoaxial subluxation underwent direct posterior fusion. Twenty-one patients with fixed atlantoaxial subluxation underwent transoral decompression and then posterior fusion while they were under anesthesia. RESULTS: At a mean follow-up of 39 months, four patients improved to Class II and 14 improved to Class IIIa, whereas six remained in Class IIIb. Neck pain was relieved in all patients. There was one perioperative death after transoral surgery (posterior fusion not done), and seven other patients died subsequently of causes unrelated to surgery. The morbidity of surgery included construct failure, cerebrospinal fluid leak, superficial wound or graft donor site infection, transient dysphagia, and lung infection. CONCLUSION: A large subset of patients with CVJ rheumatoid myelopathy may reach Class IIIb. These patients have unique management considerations. Surgery (despite high morbidity) often remains the best therapeutic option available to them. Improvement of even one grade in their Ranawat score from Class IIIb to Class IIIa brought about by surgery confers on them a significant benefit in terms of their quality of life and survival.