. . "Ventilation or Perfusion Signs and Symptoms"^^ . "Ventilation_or_Perfusion_Signs_and_Symptoms"^^ . "Ventilation or Perfusion Signs and SymptomsPTNCI" . "C5043"^^ . "Ventilation or Perfusion Signs and Symptoms"^^ . "Sign or Symptom"^^ . "C1336953"^^ .