A 72-year-old man with community-acquired pneumonia on the ward becomes acutely more breathless and hypotensive. His NEWS2 score has risen from 3 to 8 over 2 hours. What is the most appropriate immediate response?ARepeat observations in 4 hours and document the trendBIncrease his oral fluids and review at the next ward roundCRequest a routine medical review within 6 hoursDCall for urgent senior clinical review and consider critical care outreachEStart long-term oxygen therapy assessmentCheck my answer