Category: Pharmacology

Invasive Streptococcal A Infections and Intravenous Immunoglobulin

Invasive Streptococcal A Infections and Intravenous Immunoglobulin

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A middle aged woman presented with a one day history of swollen, painful red thigh after a prodromal sore throat. She had a exquisitely tender left thigh and knee with cellulitis. She was apyrexial, with normal heart rate and blood pressure, but had a respiratory rate of 24. She had a neutrophilia (28), elevated CRP, hyperlactataemia (4.1) an acute kidney injury (creat 170) and a mild coagulopathy. She was given analgesia, broad spectrum antibiotics (including clindamycin) and underwent a CT thigh which showed muscle swelling in the anterior compartment with fluid tracking up to the hip. Knee aspirate showed large number of gram positive cocci, later confirmed as Streptococcus A. Two hours into her admission the inflammation was involving the groin. She underwent exploration and debridement in theatre, and was noradrenaline dependent postoperatively. She was commenced on intravenous immunoglobulin on the same day. She required further debridement of the leg and lower abdomen on day 3. She gradually weaned off support, and underwent several more operations for closure of wounds and reconstructive surgery.

What is the role of IVIG in Invasive Streptococcal Infections

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Management of Life-Threatening Tricyclic Antidepressant Overdose

Management of Life-Threatening Tricyclic Antidepressant Overdose

Steve Mathieu1 Comment

A 44-year-old lady was brought to ED by ambulance after her partner found her drowsy in her bedroom with multiple empty packets of Amitriptyline scattered around the bed. The ambulance crew found no other medications in the immediate vicinity. Her partner had last seen her two hours previously that evening and described a history of depression, previous overdoses and chronic alcohol excess.  On arrival in ED, her airway was self-maintained but she had signs of vomitus around her mouth and smelled strongly of alcohol. Heart rate was 125, NIBP 92/38 and ECG showed sinus rhythm with prolonged PR and QRS intervals (240ms and 200ms, respectively). ABG showed a metabolic acidosis with lack of respiratory compensation, with hyperlactataemia (4.1). GCS was 9 (E2M5V2) although she appeared agitated with bilaterally dilated pupils. There was no external evidence of injury. The impression was of life-threatening Tricyclic Antidepressant (TCA) overdose within the last 2 hours along with alcohol ingestion.

What are the main features of a Tricyclic Antidepressant overdose? What treatment options are available?

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Hypertonic Saline for Raised Intracranial Pressure

Hypertonic Saline for Raised Intracranial Pressure

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A 40 year old male was brought into ED following a high speed road traffic accident. The patient was ejected from the vehicle. The patient was managed according to ATLS guidelines. He suffered extensive injuries including facial fractures, traumatic subarachnoid haemorrhage and multiple intra-cerebral haemorrhages, a flail chest and thoracic and cervical spine injuries. Once stabilised, the patient was transferred to the neurosurgical intensive care unit where an intra-cranial pressure (ICP) monitor was inserted to measure intracranial pressures. His ICP was persistently raised despite optimising respiratory parameters, deep sedation, muscle relaxation and then mannitol. A decision was made to commence an infusion of hypertonic saline 2.7% according to the local protocol. The ICP improved rapidly and stabilised and removed the need to proceed with surgical decompressive craniotomy.

What is the evidence for the use of hypertonic saline in the treatment of acutely raised intracranial pressure?Read More »

Corticosteroids in Septic Shock

Corticosteroids in Septic Shock

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A week after an elective colectomy, a 70yr old man developed septic shock and multiorgan failure secondary to anastomotic breakdown. He was managed according to surviving sepsis guidelines with source control, early antibiotics, fluids and noradrenaline. The patient remained hypotensive and refractory to noradrenaline therapy, and had vasopressin and low dose hydrocortisone infusion commenced.

What is the evidence for the use of corticosteroids in septic shock?Read More »

Mannitol and Sodium Bicarbonate in Rhabdomyolysis

Mannitol and Sodium Bicarbonate in Rhabdomyolysis

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A patient with polytrauma develops compartment syndrome with an ischaemic leg 24hrs into his admission. He undergoes revascularisation and fasciotomies, but develops rhabdomyolysis and acute kidney injury with a CK that peaks at over 100,000.

Is there a role for mannitol and bicarbonate in the management of his rhabdomyolysis and AKI?Read More »

Pentoxifylline in Alcoholic Hepatitis

Pentoxifylline in Alcoholic Hepatitis

ICM Case Summaries1 Comment

A 28 year old male presented to the Emergency Department with an upper gastrointestinal bleed. This was managed  with resuscitation and endoscopic diathermy and adrenaline injection This was his first presentation to secondary care with complications from his significant alcohol intake. He reported drinking at least 50 units of alcohol per week. Ultrasound examination demonstrated an enlarged liver with changes consistent with steatosis. On day 3 of his admission, he became tachycardic, tachypnoeic and increasingly lethargic. Examination revealed jaundice, bi-basal lung crepitations and mild confusion. Investigation confirmed an acute hepatitis by blood chemistry and repeat ultrasound. In the absence of any other cause, a diagnosis of acute alcoholic hepatitis was considered.

In patients with acute alcoholic hepatitis, does pentoxifylline reduce mortality?Read More »

Statins for Subarachnoid Haemorrhage

Statins for Subarachnoid Haemorrhage

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A 63 yr old woman collapsed at home and was brought into ED with a GCS of 3/15. She was a known hypertensive and hypercholesterolaemic. CT scan revealed a Fisher grade 3 subarachnoid haemorrhage. A ruptured middle cerebral artery was secured 24 hours later. She extubated on day 3 with a GCS of 13, but dropped her GCS to 10 on day 5 and was treated for vasospasm, which included continuing the nimodipine and simvastatin from her admission.

What is the evidence for ‘statins’ for the prevention of Vasospasm in Aneurysmal Subarachnoid Haemorrhage?Read More »

Sodium Bicarbonate in Amitriptyline Overdose

Sodium Bicarbonate in Amitriptyline Overdose

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A 40 year old man with pre-existing mental health problems presented after an overdose of 6g of amitriptyline. He was deeply unconscious and required invasive ventilation. He was commenced on bicarbonate therapy and hyperventilated to pH 7.5. Around 12 hours after admission he developed tonic-clonic seizures, a broad complex tachycardia and subsequently suffered a cardiac arrest that was refractory to defibrillation, adrenaline and amiodarone. He was given additional 8.4% bicarbonate and further defibrillation attempts and was successfully resuscitated after 90 minutes.

What is the rationale for the use of sodium bicarbonate in the management of amitriptyline overdose?Read More »

Tranexamic Acid in Trauma

Tranexamic Acid in Trauma

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A 19 year old man experienced a head on collision as the driver of a car. He suffered significant lower limb open fractures, pelvic fractures, lung injuries and a small subarachnoid bleed. Initial management was performed in ED and included oxygen, IV access and fluid, lower limb and spine immobilisation, and analgesia. He underwent a trauma series CT scan, which identified the various injuries given above. At no point was his level of consciousness a concern, and he maintained his own patent airway throughout. He did not show signs of haemodynamic instability or evidence of life threatening haemorrhage. Tranexamic acid (TXA) was not given.

What is the evidence for using tranexamic acid in trauma?

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Loop Diuretics in Acute Kidney Injury

Loop Diuretics in Acute Kidney Injury

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A 65 year old woman underwent an elective mitral valve repair (MVR) and four vessel coronary artery bypass graft (CABG) procedure. Pre-operatively she was diagnosed with chronic kidney disease (CKD) secondary to hypertensive nephropathy, and chronic airway disease secondary to smoking. Her baseline creatinine was 275. Surgery was uneventful but in the post-operatively period she developed pulmonary oedema and worsening acute kidney injury (AKI). On day 2 her creatinine reached 420 and oliguria occurred (urine output < 0.5 ml kg-1 hr-1). Non-invasive respiratory ventilation provided adequate support and maintained a normal blood PaCO2 and pH, although her base excess drifted to -7 mmol l-1.Dopamine was administered at 2–10 μg kg-1 min-1, titrated to MAP ≧ 75 mmHg; pericardial pacing continued to maintain sinus rhythm at 60 bpm; her CVP was 14 mmHg and stable. Furosemide was started and given by a continuous infusion of 10 mg hr-1 after an initial bolus of 100 mg to try and help with diuresis.

Is there any evidence to support the use of loop diuretics in acute kidney injury?

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