ECG #13

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[expand title=”Interpretation”]   Rate: Atrial = 75 – 115 min-1 Ventricular = 75 – 115 min-1 Rhythm: Sinus arrhythmia P waves:   Duration = 90 ms Amplitude = 0.05 – 0.2 mV PR interval: Duration = 120 ms Morphology = normal QRS complex: Duration = 94 ms Axis = 77° Q Waves: Nil R wave progression: Normal LV Hypertrophy [Sokolow; SV1 + […]

Blood Gas #2

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Describe and interpret this arterial blood gas: History: 53-year-old woman found collapsed at home. pH 7.58 Na 138 mmol/L pCO2 12.6 mmHg K 3.7 mmol/L pO2 160 mmHg (FiO2 0.25) Cl 108 mmol/L HCO3 12.1 mmol/L Glucose  6.3 mmol/L Lactate 3.5 mmol/L [expand title=”Interpretation”]   What is the pH? 7.58 = alkalaemia What is the primary process? pCO2 12.6 = respiratory alkalosis […]

Blood Gas #1

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Describe and interpret this arterial blood gas: History: 43-year-old man found unresponsive after absconding from the psychiatric ward.  He is intubated and ventilated. pH 7.03 Na 131 mmol/L pCO2 44.3 mmHg K 5.8 mmol/L pO2 89.4 mmHg (FiO2 0.8) Cl 108 mmol/L HCO3 11 mmol/L Glucose 21.3 mmol/L Lactate 12.6 mmol/L Urea 11.5 mmol/L Osmolality 372 mOsm/L Albumin 18 g/L […]

Blood Gas Mnemonics

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High Anion Gap Metabolic Acidosis C Carbon Monoxide, Cyanide A Alcohol, Alcoholic Ketoacidosis T Toluene M Metformin, Methanol U Uraemia D Diabetic Ketoacidosis P Paraldehyde, Phenformin, Paracetamol, Propylene glycol I Iron, Isoniazid L Lactic acidosis (any cause) E Ethylene glycol S Salicylates Causes of Lactic Acidosis Type A: Imbalanced oxygen supply and demand Type B: Metabolic derangements Carbon monoxide Shock […]