A case presentation of Tuberculous Meningitis. Management Included. This patient had experienced Drug-induced Hepatitis because of prescription reading error
Meningitis is a severe CNS pathology and early and appropriate intervention is needed to prevent adverse outcome including mortality and long term complications. This presentation focuses on the different types of meningitis and the appropriate management options
Similar to Acute encephalitis syndrome final shivaom (20)
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Couples presenting to the infertility clinic- Do they really have infertility...Sujoy Dasgupta
Dr Sujoy Dasgupta presented the study on "Couples presenting to the infertility clinic- Do they really have infertility? – The unexplored stories of non-consummation" in the 13th Congress of the Asia Pacific Initiative on Reproduction (ASPIRE 2024) at Manila on 24 May, 2024.
These lecture slides, by Dr Sidra Arshad, offer a quick overview of physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar leads (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
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Tom Selleck Health: A Comprehensive Look at the Iconic Actor’s Wellness Journeygreendigital
Tom Selleck, an enduring figure in Hollywood. has captivated audiences for decades with his rugged charm, iconic moustache. and memorable roles in television and film. From his breakout role as Thomas Magnum in Magnum P.I. to his current portrayal of Frank Reagan in Blue Bloods. Selleck's career has spanned over 50 years. But beyond his professional achievements. fans have often been curious about Tom Selleck Health. especially as he has aged in the public eye.
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Introduction
Many have been interested in Tom Selleck health. not only because of his enduring presence on screen but also because of the challenges. and lifestyle choices he has faced and made over the years. This article delves into the various aspects of Tom Selleck health. exploring his fitness regimen, diet, mental health. and the challenges he has encountered as he ages. We'll look at how he maintains his well-being. the health issues he has faced, and his approach to ageing .
Early Life and Career
Childhood and Athletic Beginnings
Tom Selleck was born on January 29, 1945, in Detroit, Michigan, and grew up in Sherman Oaks, California. From an early age, he was involved in sports, particularly basketball. which played a significant role in his physical development. His athletic pursuits continued into college. where he attended the University of Southern California (USC) on a basketball scholarship. This early involvement in sports laid a strong foundation for his physical health and disciplined lifestyle.
Transition to Acting
Selleck's transition from an athlete to an actor came with its physical demands. His first significant role in "Magnum P.I." required him to perform various stunts and maintain a fit appearance. This role, which he played from 1980 to 1988. necessitated a rigorous fitness routine to meet the show's demands. setting the stage for his long-term commitment to health and wellness.
Fitness Regimen
Workout Routine
Tom Selleck health and fitness regimen has evolved. adapting to his changing roles and age. During his "Magnum, P.I." days. Selleck's workouts were intense and focused on building and maintaining muscle mass. His routine included weightlifting, cardiovascular exercises. and specific training for the stunts he performed on the show.
Selleck adjusted his fitness routine as he aged to suit his body's needs. Today, his workouts focus on maintaining flexibility, strength, and cardiovascular health. He incorporates low-impact exercises such as swimming, walking, and light weightlifting. This balanced approach helps him stay fit without putting undue strain on his joints and muscles.
Importance of Flexibility and Mobility
In recent years, Selleck has emphasized the importance of flexibility and mobility in his fitness regimen. Understanding the natural decline in muscle mass and joint flexibility with age. he includes stretching and yoga in his routine. These practices help prevent injuries, improve posture, and maintain mobilit
- Video recording of this lecture in English language: https://youtu.be/lK81BzxMqdo
- Video recording of this lecture in Arabic language: https://youtu.be/Ve4P0COk9OI
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
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TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Ve...kevinkariuki227
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
The prostate is an exocrine gland of the male mammalian reproductive system
It is a walnut-sized gland that forms part of the male reproductive system and is located in front of the rectum and just below the urinary bladder
Function is to store and secrete a clear, slightly alkaline fluid that constitutes 10-30% of the volume of the seminal fluid that along with the spermatozoa, constitutes semen
A healthy human prostate measures (4cm-vertical, by 3cm-horizontal, 2cm ant-post ).
It surrounds the urethra just below the urinary bladder. It has anterior, median, posterior and two lateral lobes
It’s work is regulated by androgens which are responsible for male sex characteristics
Generalised disease of the prostate due to hormonal derangement which leads to non malignant enlargement of the gland (increase in the number of epithelial cells and stromal tissue)to cause compression of the urethra leading to symptoms (LUTS
New Directions in Targeted Therapeutic Approaches for Older Adults With Mantl...i3 Health
i3 Health is pleased to make the speaker slides from this activity available for use as a non-accredited self-study or teaching resource.
This slide deck presented by Dr. Kami Maddocks, Professor-Clinical in the Division of Hematology and
Associate Division Director for Ambulatory Operations
The Ohio State University Comprehensive Cancer Center, will provide insight into new directions in targeted therapeutic approaches for older adults with mantle cell lymphoma.
STATEMENT OF NEED
Mantle cell lymphoma (MCL) is a rare, aggressive B-cell non-Hodgkin lymphoma (NHL) accounting for 5% to 7% of all lymphomas. Its prognosis ranges from indolent disease that does not require treatment for years to very aggressive disease, which is associated with poor survival (Silkenstedt et al, 2021). Typically, MCL is diagnosed at advanced stage and in older patients who cannot tolerate intensive therapy (NCCN, 2022). Although recent advances have slightly increased remission rates, recurrence and relapse remain very common, leading to a median overall survival between 3 and 6 years (LLS, 2021). Though there are several effective options, progress is still needed towards establishing an accepted frontline approach for MCL (Castellino et al, 2022). Treatment selection and management of MCL are complicated by the heterogeneity of prognosis, advanced age and comorbidities of patients, and lack of an established standard approach for treatment, making it vital that clinicians be familiar with the latest research and advances in this area. In this activity chaired by Michael Wang, MD, Professor in the Department of Lymphoma & Myeloma at MD Anderson Cancer Center, expert faculty will discuss prognostic factors informing treatment, the promising results of recent trials in new therapeutic approaches, and the implications of treatment resistance in therapeutic selection for MCL.
Target Audience
Hematology/oncology fellows, attending faculty, and other health care professionals involved in the treatment of patients with mantle cell lymphoma (MCL).
Learning Objectives
1.) Identify clinical and biological prognostic factors that can guide treatment decision making for older adults with MCL
2.) Evaluate emerging data on targeted therapeutic approaches for treatment-naive and relapsed/refractory MCL and their applicability to older adults
3.) Assess mechanisms of resistance to targeted therapies for MCL and their implications for treatment selection
Report Back from SGO 2024: What’s the Latest in Cervical Cancer?bkling
Are you curious about what’s new in cervical cancer research or unsure what the findings mean? Join Dr. Emily Ko, a gynecologic oncologist at Penn Medicine, to learn about the latest updates from the Society of Gynecologic Oncology (SGO) 2024 Annual Meeting on Women’s Cancer. Dr. Ko will discuss what the research presented at the conference means for you and answer your questions about the new developments.
2. DEFINITION
• Encephalitis is defined as an inflammation of the brain (parenchyma)
caused either by infection, usually with a virus, or from a primary
autoimmune process.
• Acute encephalitis associated with viral infections includes 2 distinct
clinical-pathological diseases.
• ACUTE VIRAL ENCEPHALITIS
• Postinfectious encephalomyelitis
• WHO introduced the term Acute Encephalitis Syndrome (AES) - increase
number of reported cases.
• reportable and should be reported as acute encephalitic syndrome.
3. WHO Clinical case definition of acute encephalitis syndrome
• Person of any age, at any time of year, with
• Acute onset of fever (5-7 day) AND
• Change in mental status (including symptoms such as confusion, disorientation,
coma, or inability to talk) AND/OR
• New onset of seizures (excluding simple febrile seizures)
• Other early clinical findings
• an increase in irritability, somnolence or abnormal behavior greater.
4. MENINGITIS VERSUS ENCEPHALITIS
• The important distinguishing feature the presence or absence of normal brain
function .
• Meningitis –
• uncomfortable, lethargic, or distracted by headache, but their cerebral function remains
normal.
• Seizures and postictal states more with meningitis
• Encephalitis - abnormalities in brain function are a differentiating feature,
• altered mental status, motor or sensory deficits, altered behavior and personality
changes, and speech or movement disorders.
• Other neurologic manifestations include hemiparesis, flaccid paralysis, and paresthesias.
• Usually labeled meningitis or encephalitis based upon which features
predominate in the illness
• Meningoencephalitis common term that recognizes the overlap.
5. VIRAL VERSUS POSTINFECTIOUS ENCEPHALITIS
• Viral encephalitis can be either primary or postinfectious.
• Primary infection
• Characterized by viral invasion of the CNS.
• Neuronal involvement identified on histologic examination
• Postinfectious encephalitis (acute disseminated encephalomyelitis, or
ADEM)
• virus cannot be detected or recovered, and the neurons are spared .
• Perivascular inflammation and demyelination are prominent in this entity.
• inability to recover a virus and histologic abnormalities (immune-mediated disease)
• measles, varicella, or rubella, can produce either syndrome.
6.
7. Epidemiology
• Public health concern worldwide - high morbidity and mortality
• Incidence - 5-10 per 100 000/year
• More common in children and the elderly
• Slight predominance in males
• MOST COMMON-
• IMMUNOCOMPROMISED- CMV
• SPORADIC- HSV 1
• EPIDEMIC- HHV 6
13. LABORATORY DIAGNOSIS
CSF Examination:
• Performed in all patients with suspected viral encephalitis unless
contraindicated
• The characteristic CSF profile is indistinguishable from that of viral
meningitis
• lymphocytic pleocytosis, a mildly elevated protein concentration, and a normal
glucose concentration.
• Rarely a pleocytosis may be absent on the initial lumbar puncture (LP) but present
on subsequent LPs.
• Persisting CSF neutrophilia
• R/O bacterial infection, leptospirosis, amebic infection, and noninfectious processes
such as acute hemorrhagic leukoencephalitis.
14. IMPORTANT CLUES:
• Severely immunocompromised - may fail to mount a CSF inflammatory response.
• Cell counts >1000/μL - Arboviruses, mumps, and lymphocytic choriomeningitis
virus (LCMV)
• r/o possibility of nonviral infections or other inflammatory processes.
• Atypical lymphocytes - EBV , CMV , HSV, and enteroviruses.
• Increased numbers of plasmacytoid or Mollaret-like large mononuclear cells -
WNV encephalitis.
• Red blood cells (>500/μL) nontraumatic tap (20%)- HSV
15. CSF POLYMERASE CHAIN REACTION
• Primary diagnostic test - CMV, EBV, HHV-6, and enteroviruses.
• VZV CNS infection - CSF PCR and detection of virus-specific IgM or
intrathecal antibody synthesis
• Sensitivity (~96%) Specificity (~99%)
• Decreases with the duration of illness
• ~20% of cases remaining positive after ≥14 days.
• Not affected by ≤1 week of antiviral therapy
16. CSF Culture
• Limited ROLE.
• Insensitive
• >95% HSV encephalitis - negative CSF cultures
• Takes too long to significantly effect immediate therapy.
17. Serologic Studies and Antigen Detection
• HSV CSF antibody testing (HSV-1 glycoproteins and HSV glycoprotein
antigens) selected patients
• >1 week in duration and who are CSF PCR–negative for HSV.
• VZV infection
• PCR fails to detect viral DNA, and regarded complementary .
• WNV IgM antibodies diagnostic - WNV encephalitis
• Indicative of intrathecal synthesis.
• CSF WNV IgM seropositivity increases by ~10% per day during the first week
reaching 80% or higher on day 7.
• Persist in some patients for >1 year following acute infection.
18. MRI, CT, and EEG
• Identify or exclude alternative diagnoses and differentiation between a
focal or diffuse.
• Focal findings - raises possibility of HSV encephalitis.
• Examples of focal findings include:
• MRI (T2; FLAIR, DWI) --- areas of increased signal intensity in the frontotemporal,
cingulate, or insular regions of the brain;
• CECT - focal areas of low absorption, mass effect; or
• EEG - periodic focal temporal lobe spikes on a background of slow or low-amplitude
(“flattened”) activity.
19. • PCR documented HSV encephalitis
• 80% will have abnormalities in the temporal lobe, and an additional 10% in
extratemporal regions.
• CT is less sensitive than MRI
• normal in up to 20–35% of patients.
• EEG abnormalities >75% of PCR-documented HSV encephalitis (2/3);
• typically involve the temporal lobes but are often nonspecific.
• a distinctive EEG pattern consisting of periodic, stereotyped, sharp-and-slow
complexes originating in one or both temporal lobes and repeating at regular
intervals of 2–3 s.
• between days 2 and 15 of the illness
20. • WNV encephalitis
• MRI Abnormalities (2/3)
• deep brain structures (thalamus, basal ganglia, and brainstem), rather than the cortex apparent
on FLAIR images.
• EEGs –
• generalized slowing more anteriorly prominent than the temporally
• predominant pattern of sharp or periodic discharges more characteristic of HSV encephalitis.
• VZV encephalitis
• show multifocal areas of hemorrhagic and ischemic infarction.
• CMV (Immunocompromised adult)
• enlarged ventricles with areas of increased T2 signal on MRI outlining the ventricles
and subependymal enhancement on T1-weighted postcontrast images.
21.
22.
23. Brain Biopsy
• Reserved for
• CSF PCR studies fail to lead to a specific diagnosis,
• focal abnormalities on MRI,
• no serologic evidence of autoimmune disease, and
• progressive clinical deterioration despite treatment with acyclovir and
supportive therapy
26. • Emergent issues
• ABC of resuscitation
• Consider admission to ICU
• Fluid restriction
• Suppression of Fever
• Management of raised ICP
Treatment
27. Management Increased intracranial pressure:
• Mannitol
• initial bolus of 0.25 g/kg, then 0.25 g/kg, q6h as per requirement, up to 48 hours.
• Hypertonic (3%) saline
• preferable to mannitol in the presence of hypotension, hypovolemia, and renal failure.
• Dose - 0.1–1 mL/kg/hr by infusion;
• Intubation Indication-
• if the GCS is less than 8, or
• if there is evidence of uncal or cerebellar herniation, or
• if the patient has irregular respirations and inability to maintain airway.
• If there are signs of impending herniation
• hyperventilated to a target PaCO2 of 30– 35 mm Hg
28.
29.
30. Treatment:
• Acyclovir
• Empirically in HSV patients with suspected viral encephalitis, especially with focal
features, while awaiting viral diagnostic studies.
• Adults dose - 10 mg/kg of acyclovir intravenously every 8 h (30 mg/kg per day
total dose) for 21 days.
• Diluted to a concentration ≤7 mg/mL and transfused slowly over 1 hr.
• Side effects-
• local inflammation and phlebitis (9%), elevations in blood urea nitrogen and
creatinine levels (5%), thrombocytopenia (6%), gastrointestinal toxicity (nausea,
vomiting, diarrhea) (7%), and neurotoxicity (lethargy or obtundation,
disorientation, confusion, agitation, hallucinations, tremors, seizures) (1%).
.
31. • Penetration into CSF excellent -average drug levels ~50% of serum
levels.
• Has reduced mortality from 70% to around 10%.
• Oral acyclovir, famciclovir, and valacyclovir (efficacy against HSV, VZV,
EBV) have not been evaluated in the treatment of encephalitis either as
primary therapy or as supplemental therapy
• Adjunctive intravenous glucocorticoids in treatment of HSV and VZV
infection remains unclear.
32. • Ganciclovir and foscarnet, either alone or in combination, are often used in the
treatment of
• CMV-related CNS infections, efficacy remains unproven.
• Cidofovir may provide
• an alternative in patients who fail to respond to ganciclovir and foscarnet
• data extremely limited.
• Prevention of Complications –
• aspiration pneumonia, stasis ulcers and decubiti, contractures, deep-venous thrombosis and its
complications, and infections of indwelling lines and catheters.
33.
34. Sequelae
• Behavioural and psychiatric disturbances
• Epilepsy
• Post-encephalitic parkinsonism
• Memory difficulties
• Speech disturbances
• Permanent home care
35. Prognosis
• Factors of bad prognosis
• Severe neurologic impairment
• Older age
• High viral load in CSF
• Delay in initiation of therapy
37. Conclusion
• Acute viral encephalitis is frequently devastating .
• All patients with a febrile illness and altered behaviour or
consciousness should be investigated promptly for viral encephalitis .
• Patients suspected need a lumbar puncture as soon as possible.
• Early institution of therapy improves prognosis.
38. References:
• Medicine_Update_2018
• API_Textbook_of_Medicine_(2_Volumes),_9th_Edition
• Harrison’s_Principles_of_Internal_Medicine,_Twentieth_Edition_(Vol.1_&_Vo
l.2
• Davidsons Principles and Practice of Medicine 23rd ed
• UpToDate
• “Management of suspected viral encephalitis in adults – Association of British
Neurologists and British Infection Association National Guidelines”
• Neurol Clin Pract. 2014 Jun; 4(3): 206–215.
doi: 10.1212/CPJ.0000000000000036
The importance of distinguishing between encephalitis and aseptic meningitis relates to the fact that the likely cause of each syndrome is different.
However, the distinction between the two entities can be frequently blurred since some patients may have both a parenchymal and meningeal process with clinical features of both.
The virus can often be cultured from brain tissue.
Primary infection
characterized by viral invasion of the CNS.
Neuronal involvement identified on histologic examination (inclusion bodies on light microscopy or viral particles on electron microscopy.)
Postinfectious encephalitis (acute disseminated encephalomyelitis, or ADEM)
virus cannot be detected or recovered, and the neurons are spared .
Perivascular inflammation and demyelination are prominent in this entity.
inability to recover a virus and the type of histologic abnormalities observed suggest that postinfectious encephalitis is an immune-mediated disease
viral infections, such as measles, varicella, or rubella, can produce either syndrome.
The presence of severely increased intracranial pressure (ICP).
Ideally at least 20 mL should be collected with 5–10 mL stored frozen for later studies as needed.
CSF pleocytosis (>5 cells/μL) >95% of immunocompetent patients (documented viral encephalitis).
Polymorphonuclear pleocytosis occurs in ~45% of patients with WNV encephalitis and is also a common feature in CMV myeloradiculitis in immunocompromised patients.
may be hemorrhagic encephalitis of the type seen with HSV; nonherpetic focal encephalitides.
INCREASED CSF polymorphonuclear leukocytes - EEE virus, echovirus 9, and rarely, other enteroviruses.
Decreased CSF glucose - unusual in viral encephalitis
should suggest the possibility of bacterial, fungal, tuberculous, parasitic, leptospiral, syphilitic, sarcoid, or neoplastic meningitis.
Rare patients with mumps, LCMV, or advanced HSV encephalitis and many patients with CMV myeloradiculitis have low CSF glucose concentrations.
There have been reports of initially negative HSV CSF PCR tests that were obtained early (≤72 h) following symptom onset and that became positive when repeated 1–3 days later.
Enteroviral (EV) CSF PCR appears to have a sensitivity and specificity of >95%.
In patients with CNS infection due to VZV, CSF antibody and PCR studies should be considered complementary because patients may have evidence of intrathecal synthesis of VZV-specific antibodies and negative CSF PCRs.
In the case of WNV infection, CSF PCR appears to be less sensitive than detection of WNV-specific CSF IgM, although PCR testing remains useful in immunocompromised patients who may not mount an effective anti-WNV antibody response.
A negative HSV CSF PCR test with a high likelihood of HSV encephalitis based on clinical and laboratory abnormalities significantly reduces the likelihood of HSV encephalitis but does not exclude it.
In one study, 98% of CSF specimens remained PCR-positive during the first week of antiviral therapy, but the numbers fell to ~50% by 8–14 days and to ~21% by >15 days after initiation of antiviral therapy.
It is important to recognize that HSV CSF PCR results need to be interpreted after considering the likelihood of disease in the patient being tested, the timing of the test in relationship to onset of symptoms, and the prior use of antiviral therapy.
For example, in a patient with a pretest probability of 35% of having HSV encephalitis, a negative HSV CSF PCR reduces the posttest probability to ~2%, and for a patient with a pretest probability of 60%, a negative test reduces the posttest probability to ~6%.
In both situations, a positive test makes the diagnosis almost certain (98–99%).
EV PCR sensitivity for EV71 may be considerably lower (~30% in some reports). Parechoviruses are also not detected by standard EV RT-PCRs.
The specificity of EBV CSF PCR has not been established.
Positive EBV CSF PCRs associated with positive tests for other pathogens have been reported and may reflect reactivation of EBV latent in lymphocytes that enter the CNS as a result of an unrelated infectious or inflammatory process.
Unbiased rapid parallel sequencing technologies capable of identifying infectious genomes in CSF, brain, and other tissues have recently shown great promise for rapid diagnosis of obscure cases of encephalitis and other brain infections.
The sensitivity and specificity of CSF PCR tests for viruses other than HSV have not been definitively characterized.
More useful for Low seroprevalence rates - Diagnosis by
documenting seroconversion between acute-phase and convalescent sera (typically obtained after 2–4 weeks) or
demonstrating the presence of virus-specific IgM antibodies.
Serum antibody determination less useful -high seroprevalence rates in the general population such as HSV, VZV, CMV, and EBV.
High seroprevalence such as VZV and HSV,
an increased IgG index or the presence of CSF IgM antibodies.
Unfortunately, the delay between onset of infection and the host’s generation of a virus-specific antibody response often means that serologic data are useful mainly for the retrospective establishment of a specific diagnosis, rather than in aiding acute diagnosis or management.
Optimal detection of both HSV antibodies and antigen typically occurs after the first week of illness, limiting the utility of these tests in acute diagnosis.
Patients with suspected encephalitis almost invariably undergo neuroimaging studies and often electroencephalogram (EEG).
The lesions are typically hyperintense on T2-weighted images.
The addition of FLAIR and diffusion-weighted images to the standard MRI sequences enhances sensitivity.
Children with HSV encephalitis may have atypical patterns of MRI lesions and often show involvement of brain regions outside the frontotemporal areas.
VZV encephalitis
show multifocal areas of hemorrhagic and ischemic infarction, reflecting the tendency of this virus to produce a CNS vasculopathy rather than a true encephalitis.
Diagnostic Criteria for Acute Encephalitis
Major Criterion (required):
Altered mental status (decreased/altered level of consciousness, lethargy or personality change) ≥24hrs, no alternative cause identified
Minor Criteria
Documented fever ≥38° C within 72hrs before or after presentation
Generalized/partial seizures not fully attributable to preexisting seizure disorder
New onset focal neurologic findings
CSF WBC count ≥5/mm³
Neuroimaging suggestive of encephalitis either new from prior studies or appears acute in onset
Abnormality on EEG consistent with encephalitis and not attributable to another cause
2 for possible encephalitis
≥3 for probable or confirmed encephalitis
Relieving elevated ICP is very useful to decrease secondary brain injury and the patient will respond better to anti-infective therapy.
with the possible exception of patients with severe encephalitis due to VZV or EBV. HSV, VZV, and EBV all encode an enzyme deoxypyrimidine (thymidine) kinase that phosphorylates acyclovir to produce acyclovir-5′-monophosphate.
Host cell enzymes then phosphorylate this compound to form a triphosphate derivative.
It is the triphosphate that acts as an antiviral agent by inhibiting viral DNA polymerase and by causing premature termination of nascent viral DNA chains.
The specificity of action depends on the fact that uninfected cells do not phosphorylate significant amounts of acyclovir to acyclovir-5′-monophosphate.
A second level of specificity is provided by the fact that the acyclovir triphosphate is a more potent inhibitor of viral DNA polymerase than of the analogous host cell enzymes.
Neonatal HSV CNS infection is less responsive to acyclovir therapy than HSV encephalitis in adults; it is recommended that neonates with HSV encephalitis receive 20 mg/kg of acyclovir every 8 h (60 mg/kg per day total dose) for a minimum of 21 days.
Care should be taken to avoid extravasation or intramuscular or subcutaneous administration.
Dose adjustment is required in patients with impaired renal glomerular filtration.
Acyclovir resistance may be mediated by changes in either the viral deoxypyrimidine kinase or DNA polymerase.
Complications of therapy include To date, acyclovir-resistant isolates have not been a significant clinical problem in immunocompetent individuals.
However, there have been reports of clinically virulent acyclovir-resistant HSV isolates from sites outside the CNS in immunocompromised individuals, including those with AIDS.
Infused slowly over 1 h- to minimize the risk of renal dysfunction.
IV ribavirin 15-25 mg/kg/day in divided doses every 8 hrs
Variation in the incidence and severity of sequelae in patients surviving viral encephalitis.
EEE virus infection - nearly 80% of survivors - severe neurologic sequelae.
EBV, California encephalitis virus and Venezuelan equine encephalitis virus - severe sequelae are unusual.
The incidence and severity of sequelae were directly related to the age of the patient and the level of consciousness at the time of initiation of therapy.
WNV infection -
sequelae, including cognitive impairment; weakness; and hyper- or hypokinetic movement disorders, including tremor, myoclonus, and parkinsonism.
For example, ~5–15% of children infected with La Crosse virus have a residual seizure disorder, and 1% have persistent hemiparesis.
Detailed information about sequelae in patients with HSV encephalitis treated with acyclovir is available from the NIAID-Collaborative Antiviral Study Group (CASG) trials.
Of 32 acyclovir-treated patients, 26 survived (81%).
Of the 26 survivors, 12 (46%) had no or only minor sequelae, 3 (12%) were moderately impaired (gainfully employed but not functioning at their previous level), and 11 (42%) were severely impaired (requiring continuous supportive care).
Patients with severe neurologic impairment (Glasgow Coma Score 6) at initiation of therapy either died or survived with severe sequelae.
Young patients (<30 years) with good neurologic function at initiation of therapy did substantially better (100% survival, 62% with no or mild sequelae) compared with their older counterparts (>30 years; 64% survival, 57% no or mild sequelae).
In a large longitudinal study of prognosis in 156 patients with WNV infection, the mean time to achieve recovery (defined as 95% of maximal predicted score on specific validated tests) was 112–148 days for fatigue, 121–175 days for physical function, 131–139 days for mood, and 302–455 days for mental function (the longer interval in each case representing patients with invasive CNS disease).