“Explain the exact cellular pathway and mechanism of action for a beta-1 adrenergic receptor antagonist in the context of a pediatric patient experiencing tachycardia,” she commanded, her voice sharp and completely serious.
My brain completely blanked for a fraction of a second, paralyzed by fear. But then the thousands of hours I had spent studying in the freezing back of the ambulance kicked in. The adrenaline forced my mind into total focus. I took a deep breath and recited the pathway flawlessly. I detailed the competitive binding, the reduction in intracellular cyclic AMP, the decrease in calcium ion influx, and the ultimate negative chronotropic effect on the heart muscle. I spoke for two full minutes without stopping, my voice growing steadier with every single word. When I finished, the small break room was completely silent. I waited for her to tell me to pack up my things and get out of her hospital. Instead, the absolute faintest hint of a smile touched the corner of her mouth. She looked me up and down, taking in my heavy boots, my dark under-eye circles, and my oversized uniform.
“Why is a second-year medical student working a full-time overnight ambulance shift?” she asked.
“Because I have to pay my own way,” I answered honestly. I did not whine. I did not complain about my parents or my sister. I simply stated the facts. “I do not have a co-signer for federal loans, so I took out high-interest private loans for tuition. The ambulance job pays my rent and buys my textbooks.”
Dr. Pierce stared at me for a long, calculating moment. She nodded once, a sharp, decisive movement.
