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Angina is transient chest pressure due to myocardial ischemia, relieved by rest/nitro. Pleuritic sharp pain (Option A) suggests PE or pleurisy. Stabbing pain (Option C) suggests musculoskeletal issues. Tearing pain (Option D) suggests aortic dissection. Recognizing angina prompts aspirin, nitro (if protocol allows), and transport.

Septic shock results from systemic infection causing vasodilation, leaky capillaries, and distributive shock. Hypovolemic results from blood/fluid loss. Cardiogenic from pump failure. Obstructive from blockages. EMS care includes fluids, oxygen, monitoring, and rapid transport to hospital for antibiotics/vasopressors.

Return of spontaneous circulation (ROSC) requires post-resuscitation care: airway/ventilation management, oxygen titration, BP support, ECG monitoring, glucose check, and transport to PCI-capable facility. Atropine (Option C) is not routine. Recovery position (Option D) is for stable unconscious patients with airway reflexes.

Emphysema causes alveolar destruction and air trapping, leading to a barrel chest and poor gas exchange. Asthma involves reversible bronchospasm. Chronic bronchitis is defined by chronic mucus production. Pneumonia is an acute infection.

Obstructive shock occurs when a physical block impedes circulation—cardiac tamponade, tension pneumothorax, or pulmonary embolism. Beck’s triad (JVD, muffled heart sounds, hypotension) is classic for tamponade. Septic shock (Option A) is distributive. Hypovolemic shock (Option C) is due to fluid loss. Cardiogenic shock (Option D) is pump failure. Recognizing obstructive causes allows prompt supportive care and rapid transport for definitive interventions.