Book excerpt: This issue of Critical Care Nursing Clinics, Guest Edited by Margaret M Ecklund, MS, RN, CCRN, ACNP-BC, will focus on Winter Health Challenges, with article topics including: Near Drowning and Multiple Organism Aspiration; Geriatric Perils: Falls and Complications; Vitamin D Deficiency; Gastroenteritis and Surgical Perils; Frostbite; Rural Trauma; Respiratory failure and adult influenza; RSV; Diabetes and Seasonal Depression; and Holiday Heart Disease.