Pauli is a 70 year old female, previously healthy, who presented with mild central pleuritic chest pain and a feeling of light-headedness with minimal activity. Past medical history is significant for systemic arterial hypertension (controlled with diet). Takes no medications other than occasional Tylenol. At baseline, patient is an active person who exercises regularly. Usual HR is in the 50-58 bpm and BP averages 130/85 mmhg. Examination reveals a woman in mild distress with the following vitals on presentation: HR 125 bpm, BP 105/60mmHg, O2 saturation 88% on room air, and respiratory rate of 25/min. Temperature was 37.5°C.