References
  1. Demircan A, Aygencel G, Keles A, et al. Pulmonary embolism presenting as syncope: a case report. J Med Case Rep . 2009;3:7440.
  2. Roncon L et al. Impact of syncope and pre-syncope on short-term mortality in patients with acute pulmonary embolism. Eur J Intern Med  2018 Apr 11.
  3. 1: Altınsoy, Bülent, et al. ”Syncope as a presentation of acute pulmonary embolism.” Therapeutics and clinical risk management  12 (2016):1023.