MedFirst at Thousand Oaks. 16088 San Pedro Ave., Suite 115, San Antonio, TX 78232. (210) 200-6744. Your Heart Health Can't Wait. Shortness of breath, chest pain or pressure, unusual heartbeats, and swelling of your arms or legs are all symptoms of heart disease. Don't delay. Make an appointment with a cardiologist today. 1-855-93-HEART..