Why is frost generally less likely to form overnight when the sky is cloudy than when the sky is clear?

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A 52-year-old woman (BMI 34 kg/m²) is 40 minutes into a laparoscopic cholecystectomy under general anaesthesia with sevoflurane and remifentanil. The anaesthesiologist notices the end-tidal CO2 has risen to 74 mmHg despite unchanged ventilator settings. Examination reveals generalised muscle rigidity, jaw clenching, temperature 39.8°C, and heart rate 138 bpm. Arterial blood gas confirms mixed respiratory and metabolic acidosis. What is the most likely diagnosis?

A 28-year-old woman develops a postural headache two days after spinal anaesthesia for caesarean section. The headache worsens when she sits up and improves when she lies flat. Conservative management with hydration and simple analgesics fails after 48 hours. What is the most appropriate next step?

A child develops sudden inspiratory stridor and paradoxical chest and abdominal movement immediately after extubation in the recovery room, with no air movement audible on auscultation. Jaw-thrust with 100% oxygen via a tight-fitting facemask fails to relieve the obstruction. What is the most appropriate next step?

A 28-year-old man undergoes an open appendicectomy under general anaesthesia. He received morphine 5 mg IV intraoperatively. In the recovery room, he is alert and reports pain of 6/10. The anaesthetist plans a multimodal analgesic regimen for his post-operative pain management. Which analgesic strategy is most appropriate?

A 34-year-old male undergoes emergency laparotomy for blunt abdominal trauma. He receives 6 L of 0.9% sodium chloride intraoperatively. End-of-case arterial blood gas: pH 7.28, PaCO₂ 38 mmHg, HCO₃⁻ 17 mmol/L, Cl⁻ 115 mmol/L, lactate 1.1 mmol/L. Which complication of fluid therapy best explains these findings?

A 26-year-old woman with a known history of acute intermittent porphyria requires emergency induction of general anaesthesia. Which induction agent should be AVOIDED in this patient?

While setting up the anaesthetic machine, a medical officer attempts to open both the sevoflurane and isoflurane vaporisers at the same time. What safety feature of the anaesthetic machine prevents this?

During rapid sequence induction and intubation, in what order should the following steps occur?