…severe airflow obstruction pH below 7.35 with raised pCO₂ Acute or acute on chronic hypercapnic respiratory failure Rapidly falling pH An urgent ventilatory problem…

…hypoxaemia. Hypoxaemic failure where high flow nasal oxygen is insufficient and the carbon dioxide is normal. Bilevel NIV: Acute exacerbation of COPD with respiratory acidosis …

…Contraindications There are no absolute contraindications in hypoxaemia. Take particular care in: A risk of hypercapnic respiratory failure — COPD, severe obesity with hypoventilation, neuromuscular disease…

…evidence of hypotension Heart rate and tachycardia Respiratory rate and oxygenation Evidence of systemic congestion or acute RV failure Syncope or altered clinical status Comorbid…

…percent or less together with marked symptoms indicates a severe attack, while a PEF below 33 percent or signs of ventilatory failure means life threatening…

…with thrombosis; other cases result from spasm, microvascular dysfunction, embolism, dissection, hypotension or shock, respiratory failure, severe anaemia, sustained bradyarrhythmia, tachyarrhythmia, or severe hypertension with…

…arrest. The most common acute symptoms are dizziness (pre syncope), hypotension (chock), syncope, chest pain, heart failure and cardiac arrest. In cases with intermittent symptoms…

…and sickle cell disease. The classification also recognizes vasoreactivity subgroups among patients with idiopathic PAH, including acute responders and non responders. Left heart disease is…

…acute heart failure, or pulmonary oedema. Patients may present with chest pain, severe breathlessness, hypoxaemia, rales, or respiratory distress. In patients with HFpEF, acute hypertension…

…respiratory failure with severe hypoxaemia, severe anaemia, and hypotension or shock. Conversely, mechanisms that increase myocardial oxygen demand include sustained tachyarrhythmia and severe hypertension, with…