Pulmonary embolism is the blockage of the blood vessels in the lungs usually due to blood clots from the veins, especially the veins in the legs and pelvis.
Dyspnea, chest pain, syncope or tachypnea (respiratory rate of ≥20/min) occur in most cases of pulmonary embolism.
Pleuritic chest pain with or without dyspnea is one of the most frequent presentations of this disease.
Syncope or shock are the hallmark signs of central pulmonary embolism and usually result in severe hemodynamic repercussions.
Signs of hemodynamic compromise and reduced heart flow are also usually present.
Extended preloading of varenicline for 6 weeks before the target quit day (TQD) safely improves the efficacy of the prescription medication in facilitating smoking cessation at 12 weeks and at 6 months, according to a study presented at the American Thoracic Society (ATS) 2019 International Conference, held at Dallas, Texas in the US.