MENINGITIS :MENINGITIS By Dr Bashir Ahmed Dar Associate Professor Medicine Chinkipora Sopore Kashmir Email- drbashir123@gmail.com


What is meningitis? :What is meningitis? Meningitis is an infection of the pia-arachanoid and the CSF fluid that surrounds the brain. Meningitis is usually caused by an infection with a virus, with a bacterium or even with fungi.


How is Meningitis Caused :How is Meningitis Caused Colonization of nasopharynx by bacteria or viruses Is an important way of spreading meningitis by way of cribriform fossa or viremia or bacteriaemia and can spread to others by coughing etc.


How is Meningitis Caused :How is Meningitis Caused contagious, spread via tiny drops of fluid from the throat and nose of someone who is infected. The drops may become airborne when the person coughs, laughs, talks, or sneezes. They then can infect others when people breathe them in or touch the drops and then touch their own noses or mouths.


How is Meningitis Caused :How is Meningitis Caused Sharing food, drinking glasses, eating utensils, tissues, or towels .


How is Meningitis Caused :How is Meningitis Caused spread between people who are in close contact, such as those who live together or people who are exposed by kissing N. meningitidis cause epidemics of meningitis. In particular in a crowded day-care situation or a military recruit in a crowded training camp,schools,colleges has fallen ill with meningococcal meningitis


How is Meningitis Caused :How is Meningitis Caused Meningococcus is the bacteria that has caused outbreaks across North America over the last 8 - 10 years including most recently. Understandably the presence of a meningitis epidemic in a community is very scary to parents


How is Meningitis Caused :How is Meningitis Caused Most of the viruses that cause meningitis live in the intestines and tend to be passed on as a result of poor hygiene. Many different viruses can cause viral meningitis, most commonly enteroviruses that normally live harmlessly in people's bowels


How is Meningitis Caused :How is Meningitis Caused L. monocytogenes has been associated with such foods as raw milk, pasteurized fluid milk,[23] cheeses (particularly soft-ripened varieties), ice cream, raw vegetables, fermented raw-meat sausages, raw and cooked poultry, raw meats (of all types), and raw and smoked fish. Its ability to grow at temperatures as low as 0°C permits multiplication in refrigerated foods. In refrigeration temperature such as 4°C the amount of ferric iron promotes the growth of L. monocytogenes.


How is Meningitis Caused :How is Meningitis Caused through a person's stool, and someone who comes in contact with the stool — such as a child in day care .


How is Meningitis Caused :How is Meningitis Caused Hematogenous Many of the bacteria and viruses that cause meningitis are fairly common and are typically associated with other routine illnesses. infection of the skin, urinary system, gastrointestinal or respiratory tract can spread by the bloodstream


How is Meningitis Caused :How is Meningitis Caused A person may have another type of infection (of the lungs, throat, or tissues of the heart) caused by an organism that can also cause meningitis


How is Meningitis Caused :How is Meningitis Caused Direct infection skull fractures possess abnormal openings to the sinuses, nasal passages, and middle ears. Organisms can pass through openings and cause infection. surgical procedures or who have had foreign bodies surgically placed within their skulls (such as tubes to drain abnormal amounts of accumulated CSF) have an increased risk of meningitis.


How is Meningitis Caused :How is Meningitis Caused otitis media mastoiditis Osteomyelitic foci in the skull sinusitis Penetrating cranial injuries Brain or spine surgery Ventriculoperitoneal shun lumbar puncture.


How is Meningitis Caused :How is Meningitis Caused skull fractures Extradural abscess Subdural empyaema Spinal epidural abscess. Pachymeningitis


How is Meningitis Caused :How is Meningitis Caused Neurotropic also via an uncommon but interesting method called intraneural spread. This involves an organism invading the body at a considerable distance away from the head, spreading along a nerve, and using that nerve as a kind of ladder into the skull, where the organism can multiply and cause meningitis. Herpes simplex virus is known to use this type of spread, as is the rabies virus. Rabies HSV


How is Meningitis Caused :How is Meningitis Caused RISKS Asplenia drugs that suppress immune system Immunocompromised HIV, malignancy malignancy alcholism


How is Meningitis Caused :How is Meningitis Caused Patients with cardiac and pulmonary anomalies may spread septic foci,bronchiectasis, occasionally pneumonia). Common with pulmonary AV fistulae and R to L cardiac defect T-cell defects (HIV) Neural tube defects- Staph aureus, enteric organisms Terminal compliment deficiency- Neisseria septic foci from thrombophibitis iv drug abusers


How is Meningitis Caused :How is Meningitis Caused Immune-compromised Patients are also prone for fungal infections and the fungal infections that can result in meningitis are Aspergillus Candida Mucor Protozoal,Ameba infections,Toxoplasma


Organisms Causing Meningitis :Organisms Causing Meningitis Bacterial Viral Fungal Ricketsial Parasitic/Protozoal


Organisms Causing Meningitis :Organisms Causing Meningitis Purulent bacterial meningitis etiology newborns Group B Strep ,E. coli children - H. influenzae , Str. pneumoniae HIB vaccine has reduced incidence of H influnza infection adults - meningococccal (small epidemies - army, holiday camps,school going students),pneumococcal


Organisms Causing Meningitis :Organisms Causing Meningitis Streptococcus agalactiae (also known as Group B streptococcus) is a beta-hemolytic gram-positive streptococcus. S. agalactiae is a species of the normal flora of the female urogenital tract and rectum. Its chief clinical importance is that it can be transferred to a neonate passing through the birth canal and can cause serious group B streptococcal infection.


Organisms Causing Meningitis :Organisms Causing Meningitis In the western world, S. agalactiae is a major cause of bacterial septicemia of the newborn, which can lead to death or long-term sequelae such as hearing loss. S. agalactiae can also cause neonatal meningitis, which does not present with the hallmark sign of adult meningitis, a stiff neck


Organisms Causing Meningitis :Organisms Causing Meningitis rather, it presents with nonspecific symptoms such as fever, vomiting and irritability and can consequently go undiagnosed until it is too late. Somewhat more rarely, S. agalactiae can also cause invasive group B streptococcal disease of the adult in the pregnant, elderly, or immunosuppressed.


Organisms Causing Meningitis :Organisms Causing Meningitis Viral HSV especially in infants Enterovirus (coxsackie, echovirus) HIV Lymphocytic choriomeningitis virus Arbovirus Mumps CMV EBV VZV Adenovirus Measles


Organisms Causing Meningitis :Organisms Causing Meningitis Rubella Rotavirus Influenza and parainfluenza


Organisms Causing Meningitis :Organisms Causing Meningitis Fungal Cryptococcus Coccidiodes Histoplasmosis Mucormycosis Aspergilosis Candidasis With a particular prone settings etc


Organisms Causing Meningitis :Organisms Causing Meningitis Parasitic/protozoal Angiostrongylus Toxoplamosis Hydatid Amoeba Malaria Cysticercosis


Organisms Causing Meningitis :Organisms Causing Meningitis Rickettsial Rocky mountain spotted fever


Organisms Causing Meningitis :Organisms Causing Meningitis Others Tuberculosis Borrelia burgdorferi Treponema pallidum Mycoplasma pneumoniae brucella Chlamydia


Organisms Causing Meningitis :Organisms Causing Meningitis viral meningitis fairly common disease but rarely fatal lymphocytic predominance ie mononuclear cells (but may see neutrophils if CSF sampled early in course - up to 48hrs glucose not reduced


Organisms Causing Meningitis :Organisms Causing Meningitis may follow Temporary, flu-like symptoms with running nose sneezing etc., headache, low grade fever and stiff neck. Goes away on its own usually within three to 10 days Bed rest, paracetamol Enteroviruses, the most common type of viral meningitis Strict isolation is not necessary


Organisms Causing Meningitis :Organisms Causing Meningitis Since most cases are due to enteroviruses that may be passed in the stool, people diagnosed with viral meningitis should be instructed to thoroughly wash their hands after using the toilet.


Organisms Causing Meningitis :Organisms Causing Meningitis The incidence of viral meningitis drops with age. Neonates are at greatest risk and have the most significant risk of morbidity and mortality. The incidence during the first year of life is 20 times higher than in older children and adults.


Organisms Causing Meningitis :Organisms Causing Meningitis CRP much more elevated in bacterial than in viral meningitis (ie, 50-150 in bacterial meningitis group vs <20 in viral meningitis group). Treatment for viral meningitis is mostly supportive.


Neisseria meningitidis :Neisseria meningitidis Bacteria http://www.waterscan.co.yu/viruses-and-bacteries.php?lng=sr


Slide 39:Hemophilus influenza (H flu) Strep pneumoniae


CSF-Gram stain: :CSF-Gram stain: Low power view showing many neutrophils.


CSF-Gram stain: :CSF-Gram stain: High power shows clusters of bacteria. Neutrophils


CSF-Gram stain: :CSF-Gram stain: High power shows clusters of bacteria. Neutrophil


CSF-Gram stain: :CSF-Gram stain: High power shows clusters of bacteria. Neutrophil


CSF-Gram stain: :CSF-Gram stain: Observe Paired rounded backeria – (diplococci) staining pink (gram negative)


Pathogenesis of Meningitis :Pathogenesis of Meningitis The virus or bacteria replicates in the initial organ system (ie, respiratory or gastrointestinal mucosa) and gains access to the bloodstream. Primary viremia or bacteremia introduces the virus or bacteria to the reticuloendothelial organs (liver, spleen, and lymph nodes.)


Pathogenesis of Meningitis :Pathogenesis of Meningitis If the replication persists despite immunologic defenses, secondary bacteremia or viremia occurs, which is thought to be responsible for seeding of the CNS. Rapid viral replication likely plays a major role in overcoming the host defenses.


Pathogenesis of Meningitis :Pathogenesis of Meningitis There occurs local immune response to bacteria or virus Increased vascular permeability oozing of fluid exudate,inflammatory cells Neutrophils migrate from capillaries and release toxins TNF-a and IL-B1 produced by activated macrophages and endothelial cells


Pathogenesis of Meningitis :Pathogenesis of Meningitis Ensuing inflammatory response increases blood-brain permeability Cerebral edema Increased ICP


Pathogenesis of Meningitis :Pathogenesis of Meningitis cellular damage and loss of cellular homeostasis and worsen cerebral edema damage to vessels lead to vasculitis and bleed or thrombose leading to infaraction or haemorrahage exudate formation etc can obstruct CSF flow and lead to hydrocephalous ICP lead to herniation


Pathogenesis of Meningitis :Pathogenesis of Meningitis exudative pus of dead cells ,fluid,fibrin and leucocytes (pus) cause thick whitish grey layer that covers the leptomeninges over the surface of brain and filling sulci and basal cisterns with swollen edematous brain. damage to neurons can take place if extending to brain cells resulting in their degeneration.


Slide 51:The white appearance of this calf brain is caused by neutrophils within the meninges – a condition known as meningitis. This is usually due to a bacterial infection.


Slide 52:This calf brain shows similar pathology. If a glass slide is pressed to the surface of the brain and stained it would show high numbers of neutrophils.


Slide 53:Bovine This brain shows irregular red spots which are areas of hemorrhage and necrosis caused by the bacteria, Histophilus somni.


Slide 54:Brain: Purulent meningitis


Slide 55:Brain: meningitis.


Pathogenesis of Meningitis :Pathogenesis of Meningitis if infection becomes localised in brain then can lead to abcess formation especially in case of direct infections. immune system tries to confine this localised infection therefore may develop fibrous wall around it with perivascular chronic inflamatory cells around it,leading to brain abcess with central suppuration and liqufication due to death of cells .healing may occur with fibrous scar.


The evolution of the abscess is as follows: :The evolution of the abscess is as follows: An area of cerebritis begins, in which polymorphonuclear leukocytes are attracted to the invading bacteria. Liquefaction of brain tissue rapidly ensues, and at the periphery, a thin rim of granulation tissue composed of new capillaries and fibroblasts is formed.


evolution of the abscess :evolution of the abscess With time, a connective tissue capsule is formed by collagen laid down by infiltrating fibroblasts. Often this is more perfectly formed on the outer aspect of the abscess, presumably due to the contribution of the reservoir of potential  in the adjacent meninges.


evolution of the abscess :evolution of the abscess Due to the poor encapsulation of the medial aspect of an abscess, which abuts upon or is located within the cerebral white matter, the infection tends to form daughter or satellite abscesses medially which may eventually rupture into the ventricular system


evolution of the abscess :evolution of the abscess Such rupture may lead to rapid death, and in any event, is usually followed by severe ventriculitis and massive meningitis as infected CSF pours into the subarachnoid space.  Antibiotic therapy greatly decelerates the growth of an abscess, and may allow time for a complete capsule to form after which the abscess may be removed surgically.


BRAIN ABCESS :BRAIN ABCESS


BRAIN ABCESS :BRAIN ABCESS The image above shows a large abscess in the brain. The purulent center is surrounded by a capsule. Often a zone of hyperemia is present adjacent to the wall and there is marked swelling of the adjacent brain tissue


Bacterial Meningitis: (Library Pictures) :Bacterial Meningitis: (Library Pictures) Abscess-Cerebral Gross:


Slide 66:Abscess-Cerebral MRI


Bacterial Meningitis: (Library Pictures) :Bacterial Meningitis: (Library Pictures) Meningial enhancement in a Bacterial meningitis - CT Scan Image


Signs & symptoms of Meningitis :Signs & symptoms of Meningitis Acute (<1 day)- common with S. pneumoniae and N. meningitides Subacute (2-3 days)- preceding URI like symptoms, more common with H. flu and other pathogens.


Signs & symptoms of Meningitis :Signs & symptoms of Meningitis Non-specific complaints Fever Headache Nausea and vomiting --Nuchal rigidity Lethargy Irritability Restlessness Poor feeding Back pain Altered mental status (seizure, coma)


Signs & symptoms of Meningitis :Signs & symptoms of Meningitis Febrile stiff neck causing may causearched position Opisthotonos Focal neurologic signs Petechia/purpura- DIC with N. menigitidis Positive Kernig’s and Brudniski’s i.e. , Meningismus (stiff neck + Brudzinski + Kernig signs) Shock Disseminated intravascular coagulation (DIC) Cerebral edema


Kernig’s Sign :Kernig’s Sign Patient placed supine with hips flexed 90 degrees. Examiner attempts to extend the leg at the knee Positive test elicited when there is resistance to knee extension, or pain in the lower back or thigh with knee extension


Signs & symptoms of Meningitis :Signs & symptoms of Meningitis


Brudzinski’s Sign :Brudzinski’s Sign Patient placed in supine position and neck is passively flexed towards the chest Positive test is elicited when flexion of neck causes flexion at knees and/or hips of the patient


Normal fundus :Normal fundus


Increased intracranial pressure (ICP) :Increased intracranial pressure (ICP) Papilledema Cushing’s triad Bradycardia Hypertension Irregular respiration Severe headache herniation vomitting ICP monitor (not routine) Changes in pupils


Meningococcemia - Petechiae :Meningococcemia - Petechiae


Signs & symptoms of Meningitis :Signs & symptoms of Meningitis Is due to small skin bleed All parts of the body are affeced The rashes do not fade under pressure Pathogenesis: a. Septicemia b. wide spread endothelial damage c. activation of coagulation d. thrombosis and platelets aggregation


Signs & symptoms of Meningitis :Signs & symptoms of Meningitis e. reduction of platelets (cosumption ) f. BLEEDING 1.skin rashes 2.adrenal hemorrhage Arenal hemorrhage is called Waterhouse-Friderichsen Syndrome.It cause acute adrenal insufficiency and is uaually fatal


Meningococcemia - Purpura fulminans :Meningococcemia - Purpura fulminans


Signs & symptoms of Meningitis :Signs & symptoms of Meningitis May also look like bruises,echymosis .


Complications and Outcome of Meningitis :Complications and Outcome of Meningitis Infection can spreading to Dura – pachymeningitis Leptomeninges - leptomeningitis Brain – encephalitis Spinal cord – myelitis Ventricles - ventriculitis


Complications and Outcome of Meningitis :Complications and Outcome of Meningitis Disseminated intravascular coagulation (DIC) Cerebral edema Adrenal hemorrhage is called Waterhouse-Friderichsen Syndrome.It cause acute adrenal insufficiency and is uaually fatal septicaemia and infection spreading to other organs motor and neurological deficits


Complications and Outcome of Meningitis :Complications and Outcome of Meningitis Seizures SIADH Subdural effusions & empyema Septic sinus or cortical vein thrombosis Arterial ischemia / infarction (inflammatory vasculitis) CNs Palsies (esp deafness) Septic shock / multi-organ failure from bacteremia (esp meningococcus & pneumococcus)


Complications and Outcome of Meningitis :Complications and Outcome of Meningitis risk of adrenal hemorrhage with hypo-adrenalism (Waterhouse-Friderichsen syndrome) Serum sodium level may be abnormal because of dehydration or the rare occurrence of syndrome of inappropriate antidiuretic hormone secretion (SIADH).


Complications and Outcome of Meningitis :Complications and Outcome of Meningitis Serum amylase level may be elevated in cases caused by mumps even in the absence of parotitis. Focal infarctions/microinfarcts due to endarteritis oblitrerans Formation of intracranial mass Cranial nerve palsies


Increased intracranial pressure :Increased intracranial pressure Headache Vomiting Decreased Level of Consciousness Papilledema Herniation


TYPES OF HERNIATION :TYPES OF HERNIATION Subfalcine (cingulate) Transtentorial (uncal) Tonsillar (foramen magnum) Extracranial


TRANSTENTORIAL (UNCAL) HERNIATION :TRANSTENTORIAL (UNCAL) HERNIATION SHIFT OF THE BRAIN FROM THE MIDDLE TO THE POSTERIOR FOSSA THROUGH THE TENTORIAL INCISURA MAY BE UNILATERAL OR “CENTRAL” SECONDARY EFFECTS INCLUDE: Compression of the third cranial nerve(s) Duret hemorrhages in midline rostral brainstem Compression of the contralateral cerebral peduncle (Kernohan’s notch) Compression of the posterior cerebral artery with infarction of the medial occipital lobe


HYDROCEPHALUS :HYDROCEPHALUS DILATATION OF THE VENTRICULAR SYSTEM NONCOMMUNICATING: Due to obstruction within the ventricular system, e.g., tumor, aqueductal stenosis COMMUNICATING: Due to obstruction of CSF flow in the subarachnoid space with decreased reabsorption


Complications and Outcome of Meningitis :Complications and Outcome of Meningitis Consequences of meningitis can be mild, moderate or severe, with many survivors being left with permanent disability Septicaemia and shock can lead to skin grafting and scarring, amputations and in severe cases neurological deficits Meningitis can lead to damage in various areas of the brain resulting in loss of sight, hearing and neurodevelopmental deficits


Complications and Outcome of Meningitis :Complications and Outcome of Meningitis Scarring amputation of digits and limbs Neurological damage


Complications and Outcome of Meningitis :Complications and Outcome of Meningitis Visual impairment and blindness Auditory impairment and deafness Neuromotor disabilities Seizure disorders Behaviour problems Learning difficulties


Complications and Outcome of Meningitis :Complications and Outcome of Meningitis The complications associated with septic shock can result in irreversible tissue damage and gangrene Tissue damage occurs as a result of inadequate tissue perfusion and oxygenation from hypotension and coagulopathy Skin grafting and amputation may be necessary


Complications and Outcome of Meningitis :Complications and Outcome of Meningitis Damage to various areas of the brain as a consequence of inflammation in the subarachnoid space This appears as exudate covering the surface of the brain Many complications are due to cranial nerve damage


Complications and Outcome of Meningitis :Complications and Outcome of Meningitis Psychosocial and emotional problems - low self esteem and difficulties coping Subtle complications - poor concentration, clumsiness and mood swings May be age-specific


Complications and Outcome of Meningitis :Complications and Outcome of Meningitis Tiredness Recurring headaches Memory loss, which may be severe Difficulties in concentration Anger outbursts Clumsiness


Differential Diagnosis of Meningitis :Differential Diagnosis of Meningitis Brain abscess Encephalitis Tumor like ASTROCYTOMAS,OLIGODENDROGLIOMAS,EPENDYMOMAS MIXED GLIOMAS Metastatic tumor Subdural and epidural empyema subdural subarachnoid


Differential Diagnosis of Meningitis :Differential Diagnosis of Meningitis Chemical meningitis: Rupture of tumor intracranial haemorrage like Epidural subdural Subarachnoid intraparenchymal


Differential Diagnosis of Meningitis :Differential Diagnosis of Meningitis metabolic encephalopathy hyperglycaemic coma uremia hepatic encephalopathy vit B deficiencies vascular diseases (amyloid angiopathy, vasculitis, berry aneurysms, A-V malformations


Investigations & Diagnosis of Meningitis :Investigations & Diagnosis of Meningitis


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE It is produced in the brain by modified ependymal cells in the choroid plexus (approx. 50-70%), and the remainder is formed around blood vessels and along ventricular walls. It circulates from the choroid plexus through the interventricular foramina (foramen of Monro) into the third ventricle, and then through the cerebral aqueduct (aqueduct of Sylvius) into the fourth ventricle, where it exits through two lateral apertures (foramina of Luschka) and one median aperture (foramen of Magendie).


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE It then flows through the cerebellomedullary cistern down the spinal cord and over the cerebral hemispheres.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE The cerebrospinal fluid is produced at a rate of 500 ml/day. Since the brain can only contain from 135-150 ml, large amounts are drained primarily into the blood through arachnoid granulations in the superior sagittal sinus. Thus the CSF turns over about 3.7 times a day.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE Direct cranial measurement of ICP. ICP monitoring requires admission to the hospital. A small pressure monitor is inserted through the skull into the brain or ventricles to measure the ICP. pressure monitoring (either by lumbar catheter or the intracranial method) can detect an abnormal pattern of pressure waves.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE Ventricular puncture for the relief of increased ICP is one of the oldest practices in neurosurgery.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE The "gold standard" technique for ICP monitoring is a catheter inserted into the lateral ventricle, usually via a small right frontal burr hole. This can be connected to a standard pressure transducer via a fluid-filled catheter in neurosurgery.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE Indirect measurement of ICP by lumber puncture. The two principal objections to lumbar puncture in the diagnosis of intracranial hypertension have been the danger of inducing brain-stem compression through tentorial or tonsillar herniation and the contention that spinal fluid pressure is not always an accurate reflection of ICP.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE Indications 1. Diagnostic aid 2. Therapy for idiopathic intracranial hypertension 3. Infusion of anaesthetic (“spinal”), chemotherapy, or contrast agents (myelography)


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE Contraindications - INR > 1.4 or other coagulopathy - platelets < 50 - infection at desired puncture site - obstructive / non-communicating hydrocephalus - intracranial mass - high intracranial pressure (ICP) / papilloedema


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE An LP may safely be performed without first doing a CT head in a young previously healthy patient with no history of seizures, a normal level of consciousness and a normal neurological exam.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE Anatomy Intercristal line is an imaginary line that connects the superior border of the iliac crests - L4/5 interspace is the first interspace caudal to the intercristal line


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE Materials sterile gloves and mask LP kit (contains: syringe, 25 and 22G needles, 1% lidocaine, sterile drapes, sponges and gauze, 22G LP needle, stopcock and manometer, 4 collection tubes and band-aid) - sterilization solution (chlorhexidine or proviodine)


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE Technique 1. Obtain patient consent 2. Position the patient,close to edge of bed as possible 3.Pillow under head and between legs 4.Head flexed and legs curled up towards chest,ask patient to bulge out lumbosacral spine 5.Carefully open LP kit and put cleaning solution in reservoir.


Positioning :Positioning INCORRECT CORRECT


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE 6.Put on mask and sterile gloves. 7.Sterilize the field using the sterilizing solution and sponges provided. Clean a 6 inch area around the desired entry site, proceeding outward in concentric circles. Do this 3 separate times. Place sterile drape over the field.


Skin Preparation :Skin Preparation Overlying skin cleaned with povidone-iodine Sterile drape placed with an opening over the LS


Spinal Needle Insertion :Spinal Needle Insertion Local anesthesia infiltrated 20 or 22 gauge spinal needle with stylet Advance spinal needle slowly, angling slightly toward the head Flat surface of bevel of needle positioned to face patient’s flanks


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE 8. Ensure all items in LP tray are ready for use. E.g.. 1% or 2% lidocaine loaded into syringe, collection tubes open, test to see that the stylet slides in/out of LP needle easily, stopcock and manometer for opening pressure measurement ready


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE 9.Local anaesthesia. Using a 25G needle, inject 1% or 2% lidocaine under the skin at the desired entry site. A small bleb under the skin is sufficient. Switch the needle tip to the 22G needle and anaesthetize deeper structures by inserting the needle further, injecting lidocaine while proceeding forward.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE 10.Insert LP needle. The bevel should be parallel to the spinal column. Always advance the needle with the stylet in place. Aim needle in the midline, slightly cephalad, towards the patient’s umbilicus. Advance needle slowly until it is inserted 2-3 cm, then withdraw the stylet to check for CSF return. Continue to advance the needle, periodically checking for CSF return. Often a "pop'' is appreciated as the needle pierces the dural membrane.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE If the needle meets bone or if blood returns (hitting the venous plexus anterior or posterior to the spinal canal), withdraw the needle to the skin and redirect the needle


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE 11.Once CSF flow is obtained, measure the opening pressure by attaching first the stopcock to the LP needle and then the manometer to the stopcock.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE 12.Collect CSF fluid into sequential tubes. about 2 ml in each tube is sufficient for basic investigations. More fluid will need to be collected for special tests e.g. viral PCR, cytology etc 13.Reinsert stylet. Withdraw needle. Place band-aid over insertion site.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE What to order The basics Tube #1 Cell count and differential Tube #2 Chemistry (protein, glucose) Tube #3 Culture and Gram stain Tube #4 reserve with csf in it


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE Other tests to consider - Will need to collect extra fluid for these tests in tube #3 or #4. India ink and / or Cryptococcal Ag (for Cryptococcus neoformans) AFB and / or PCR for TB Viral PCR (includes HSV, CMV, EBV) arbovirus / WNV, echovirus


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE VDRL fungal culture viral culture PCR and /or antibody titers for Lyme ds.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE oligoclonal banding (3-4 ml) IgG index, IgG :albumin ratio cytology (must be collected in cytology fixative) (8-10ml) flow cytometry (3-4 ml) (NOT in fixative)


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE How much CSF to withdraw? - CSF is produced at a rate of 0.3 ml/min in adults or 450 ml/24h - CSF volume is approximately 150 ml in an adult


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE - For basic investigations, only require 4-8 ml - May require more volume for special tests. Maximum to be removed at one time should probably not exceed 20 ml.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE Normal opening pressure ranges 50 to 200 mm H20 in adults and up to 250 mm H20 in obese women patients or 5-20 cm of H20. 2 Intracranial hypotension is defined as an opening pressure of less than 50 mm H20.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE Normal CSF is crystal clear. However, as few as 200 white blood cells (WBCs) per mm3 or 400 red blood cells (RBCs) per mm3 will cause CSF to appear turbid.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE Glucose: 2/3rd or < 40% of concurrent serum glucose or less than 2/3rd of serum glucose (often absolute CSF glucose < 2.2 , (normal is 2.2 mmol to 4 mmol/l) cells <5/cmm mostly lymphocyte


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE Xanthochromia is a yellow, orange, or pink discoloration of the CSF, most often caused by the lysis of RBCs resulting in hemoglobin breakdown to oxyhemoglobin, methemoglobin, and bilirubin.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE Discoloration begins after RBCs have been in spinal fluid for about two hours, and remains for two to four weeks. Xanthochromia is present in more than 90 percent of patients within 12 hours of subarachnoid hemorrhage


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE CSF protein levels (normal 15 to 45 mg/dL ) or < 1.5 g per L.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE Culture provides definitive diagnosis as well as identificaiton of pathogenic organism and antibiotic susceptibilities blood culture positive in 50% cases


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE The Xpert EV test, approved for use in March 2007, can rapidly test for enteroviral meningitis. The test uses a reverse-transcription PCR disposable cartridge on which CSF is applied, and enteroviral genetic material is identified if present. Results are ready in 2.5 hours, as opposed to days to weeks in traditional PCR studies.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE CT scan with contrast helps in ruling out intracranial pathology. Contrasted scans should be obtained to evaluate for any enhancement along the meninges. ct scan also excludes intracranial abscess, subdural empyema, or other lesions. Alternatively, and if readily available, an MRI of the brain should be done.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE MRI with contrast is the criterion standard in visualizing intracranial pathology in viral encephalitis HSV-1 commonly affects basal frontal and temporal lobes with a typical picture of diffusely enhancing bilateral lesions.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE All patients whose condition is not improving clinically within 24-48 hours should have more extensive work-up to discern the cause of meningitis. Blood, feces, and throat swabs may be sent for viral serology and cultures.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE Acid-fast staining of CSF should be performed and the remaining fluid should be sent for PCR testing for HIV and CMV. Serum titers of antibodies against HIV and toxoplasma should be obtained.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE EEG may be performed if encephalitis or subclinical seizures are suspected in the altered patient. Periodic lateralized epileptiform discharges (PLEDs) are often seen in herpetic encephalitis.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE CSF Lactate Concentration normally 14 mg/dl in bacterial meningitis is usually <25 mg/dl PCR for microbial DNA may become sensitive and specific method for bacterial identification


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE CT Scanning sould be done and preferred choice before Lumbar Puncture in Suspected Meningitis Acid-fast staining of CSF should be performed and the remaining fluid should be sent for PCR testing for HIV and CMV. Serum titers of antibodies against HIV and toxoplasma should be obtained.


CSF & LUMBER PUNCTURE :CSF & LUMBER PUNCTURE Additional serum collection 10-21 days later may aid in discerning rising titers in the antibodies against specific viral pathogens; a 4-fold increase in viral antibodies confirms the diagnosis. This is particularly useful for arboviral and LCMV cases, but also is helpful in ruling out toxoplasmosis, leptospirosis, borreliosis, and rickettsial infections. Although some of these studies do not yield an immediate result for clinical decision making, they may be useful for prognostication.


CSF PRESSURE :CSF PRESSURE Opening pressure: 5-20 cm water (only valid in lateral decubitus position) or 50-200 mm of H20.


CSF PRESSURE :CSF PRESSURE ICP is measured in millimeters of mercury (mmHg) and, at rest, is normally 5–20 mmHg for a supine adult, and becomes negative (averaging -10 mmHg) in the vertical position.


CSF PRESSURE :CSF PRESSURE Normal CSF pressure in the lower back is between 50-200 mm water. Normal Intracranial pressure(within the cranium) however is between 5-20 mmHg or 50-200 mm H2O in adults.


Investigations & Diagnosis of Meningitis :Investigations & Diagnosis of Meningitis Repeat CSF analysis 24 to 36 hours (minimum of 24 hours) after initiation of therapy Changes in therapy/concomitant therapy as needed Evaluation of drug concentrations in CSF


Investigations & Diagnosis of Meningitis :Investigations & Diagnosis of Meningitis 5-7 weeks after completion of all therapy Lumbar puncture repeated only if clinically indicated


Investigations & Diagnosis of Meningitis :Investigations & Diagnosis of Meningitis LATE POST-THERAPY VISIT 5-6 months after completion of therapy Emphasis on hearing/ development/ neurological findings Behavioral difficulties should be documented as well


Investigations & Diagnosis of Meningitis :Investigations & Diagnosis of Meningitis Persistence of pathogen at 24-36 hr. tap leading to additional therapy or change in therapy. If pathogen resistant, pt. Unevaluable


CSF evaluation :CSF evaluation


CSF Diagnosis :CSF Diagnosis


CSF Abnormalities In Bacterial Meningitis :CSF Abnormalities In Bacterial Meningitis


CSF evaluation :CSF evaluation


Summary of Typical CSF Findings :Summary of Typical CSF Findings


TREATMENT of MENINGITIS :TREATMENT of MENINGITIS Empiric Antibiotics: Cefotaxime 2g IV q4hrs add Vancomycin 1-2 g IV q8-12 hrs in all patients (till possibility of Penicillin-resistant Strep pneumoniae has been ruled out) add Ampicllin 2g IV q4hrs in elderly or immunocompromised patients (for Listeria infections)


Slide 164:for patients with serious penicillin allergies, Meropenem 1-2g IV q8hrs as alternative Ceftazidime (2g IV q8hr) + Vancomycin for neurosurgical patients, those with shunts or CSF leaks May consider adjunctive Acyclovir (10 mg/kg IV q8hrs if normal renal function)


Slide 165:Therapy can be modified as the results of Gram stain, cultures, and PCR testing become available. Patients in unstable condition need critical care unit admission for airway protection, neurologic checks, and prevention of secondary complications.


Slide 166:since SIADH has been reported. Fluid restriction, diuretics, and rarely hypertonic saline infusion may be used to correct the hyponatremia


Slide 167:Cerebral edema does occur in cases of severe encephalitis and may require intracranial pressure control by infusion of mannitol (1 g/kg initial dose followed by 0.25-0.5 g/kg q6h), IV dexamethasone, or intubation and mild hyperventilation, with arterial PCO2 around 28-30 mm Hg


Slide 168:Use of adjunctive corticosteroids: - prior to or along with initial antibiotics, administer Dexamethasone 10 mg IV for suspected bacterial meningitis (based on cloudy CSF, CSF WBC counts > 1000 or + Gram stain) - continue 10 mg IV q6hr x 4 days


Slide 169:Isolation & Contact Prophylaxis: - generally isolate cases of bacterial meningitis for up to 48 hours of appropriate antibiotics - concern is to reduce transmission of meningococcal infections


Slide 170:can be taken out of isolation after this time or if alternative pathogen identified - department of health should be notified of pathogens in pyogenic meningitis


Slide 171:Close contacts (family members, partners, co-workers or school children) should receive prophylaxis if meningococcal or haemophilus influenzae type B (if not vaccinated): - rifampin 600 mg PO bid x 2d - ciprofloxacin 500 mg PO single dose


Slide 172:dexamethasone 0.6 mg/kg/day IV q6h for 4 days reduces incidence of neurologic sequelae, i.e., hearing loss electrolyte abnormalities - SIADH


Slide 173:Prognostic Factors: 1. Age 2. Level of Consciousness (50% mortality if unresponsive or minimally responsive on admission) 3. Seizures early in course 4. Strep. pneumoniae meningitis 5. CSF results (lower glucose & WBC counts, higher protein)