Shortness of breath on exertion (SOBOE) refers to SOB when exercising.  Causes include COPD and CCF.

Single-photon emission computed tomography (SPECT) is a non-invasive, nuclear medicine imaging technique (similar to PET), combining the information gained from scintigraphy with that of CT.

SPECT provides metabolic and functional information.

SPECT may be combined with a separate CT machine, providing hybrid imaging: single photon emission computed tomography-computerised tomography (SPECT-CT).

Radiopaedia - SPECT

Radiopaedia - SPECT vs. PET

STEMI is ST-elevation MI

STI is a sexually-transmitted infection (also termed STD, sexually-transmitted disease).

STIs are passed through unprotected sex or genital contact.

The superior vena cava (SVC) is a large valveless vein that returns deoxygenated blood from the upper body to the right atrium of the heart.

Radiopaedia - SVC

Supraventricular tachycardia (SVT) is an abnormally fast heart rhythm due to aberrant electrical activity in the upper heart (arising in the atria or atrioventricular node).

There are four main types: AF, paroxysmal SVT, atrial flutter, and Wolff–Parkinson–White syndrome.

Patient.info - SVT in adults