25,729 articles
National Medical Association
The National Medical Association, founded in 1895, is the oldest and largest US organization representing African American physicians, publishing the Journal of the National Medical Association since 1909.
National Medical Center
The National Medical Center (국립중앙의료원) is a public general hospital in Jung-gu, Seoul, opened in 1958 with Scandinavian and UN aid after the Korean War.
National Patient Safety Agency
The National Patient Safety Agency (NPSA) was an NHS Special Health Authority, established in 2001, that ran the voluntary National Reporting and Learning System for patient safety incidents in England and Wales; abolished in 2012.
National Provider Identifier
National Provider Identifier (NPI): 10-digit intelligence-free number identifying US health care providers under HIPAA, assigned via NPPES, Luhn check digit, compliance from May 23, 2007.
National School Lunch Act
National School Lunch Act (Richard B. Russell NSLA, 42 U.S.C. 1751 et seq.), 1946 Truman-era statute creating the USDA National School Lunch Program; ~30 million children daily, amended by the 1966 Child Nutrition Act and 2010 Healthy, Hunger-Free Kids Act.
National Taiwan University Hospital
National Taiwan University Hospital (NTUH, 國立臺灣大學醫學院附設醫院), founded 1895 in Taipei, is Taiwan's oldest large public hospital and a national medical center; JCI-accredited, with branch hospitals and over 5,400 system beds.
National University Hospital (Damascus, SY)
National University Hospital (المستشفى الوطني الجامعي), formerly Al-Assad University Hospital, is a Damascus University teaching and referral hospital opened 14 March 1988, with 597 beds, renamed in December 2024 after the Assad regime's fall.
National University Hospital (Singapore, SG)
National University Hospital (NUH), Singapore's university hospital at Kent Ridge, opened 24 June 1985 as the country's first restructured hospital; principal teaching hospital of NUS Yong Loo Lin School of Medicine, 1,289 beds, member of NUHS.
Native American myopathy
Native American myopathy, now called STAC3 disorder or Bailey-Bloch congenital myopathy, is an autosomal recessive congenital myopathy caused by STAC3 mutations, first described in the Lumbee tribe, with weakness, contractures, cleft palate, and malignant hyperthermia susceptibility.
Natriuresis
Natriuresis is renal sodium excretion, governed by tubular reabsorption, pressure natriuresis, and natriuretic peptides; spot urine sodium guides loop diuretic titration in acute heart failure.
Natriuretic peptide
Natriuretic peptides (ANP, BNP, CNP; BNP and NT-proBNP) are heart-derived peptide hormones used as blood biomarkers to diagnose, risk-stratify, and monitor heart failure, with guideline rule-out thresholds and prognostic value.
Natural Cycles
Natural Cycles (NC°) is a Swedish contraceptive app that determines daily fertility status from basal body temperature and cycle data, the first FDA-cleared contraceptive app in 2018.
Natural family planning
Natural family planning (fertility awareness-based methods) identifies fertile days via cervical mucus, basal body temperature, or calendar rules to achieve or avoid pregnancy; typical-use failure rates range 2-23% by method.
Natural history and clinical course of Duchenne muscular dystrophy
The natural history of Duchenne muscular dystrophy runs from symptoms at ages 2 to 3, loss of walking by 8 to 12 untreated, and death in the twenties.
Natural history study
A natural history study is a preplanned observational study that tracks a disease's course over time without assigning an intervention, informing rare-disease drug development and external controls.
Natural orifice specimen extraction surgery
Natural orifice specimen extraction surgery (NOSES) is a minimally invasive technique that removes resected tissue through the anus, vagina, or mouth, avoiding an abdominal incision.
Natural orifice transluminal endoscopic surgery
Natural orifice transluminal endoscopic surgery (NOTES) is a minimally invasive technique operating on abdominal or thoracic organs through the mouth, anus, vagina, or bladder, with no abdominal-wall incision.
Nature Reviews Cardiology
Nature Reviews Cardiology (Nat. Rev. Cardiol.), ISSN 1759-5002/1759-5010, is a Springer Nature monthly review journal launched in 2004 as Nature Clinical Practice Cardiovascular Medicine, publishing commissioned, peer-reviewed non-primary cardiology content with a 2025 impact factor of 50.2.
Naturopathy
Naturopathy, also called naturopathic medicine, is a medical system from traditional practices and 19th-century European health approaches that aims to treat disease by addressing root causes through diet, exercise, and stress management.
Nausea
Nausea, also called emesis-related queasiness, is the unpleasant sensation that vomiting is imminent. It affects over 50% of adults yearly, is three times more common in women, and becomes chronic when persisting over 4 weeks.
Nausea or vomiting
Nausea or vomiting (ICD-11 MD90): nausea is the urge to vomit, vomiting the forceful expulsion of gastric contents. Common symptoms with central and peripheral mechanisms, caused by gastroenteritis, drugs, pregnancy, and many other conditions.
Navacaprant
Navacaprant (NMRA-140, formerly BTRX-335140) is an oral, highly selective kappa opioid receptor antagonist developed by Neumora as an MDD monotherapy; its Phase 3 KOASTAL program failed and development was discontinued in 2026.
Navaratna Raja Mrganga Rasa
Navaratna Raja Mrganga Rasa (नवरत्नराजमृगाङ्क रस), also Navaratna Raja Mriganka Rasa, is a classical Ayurvedic herbo-mineral tablet from Yogaratnakara combining mercury, sulphur, metal and gem bhasmas with herbs, used as a rasayana for Vata disorders and tuberculosis.
Navasara sodhana
Navasara sodhana is the Ayurvedic Rasashastra purification of navasara (navasadara, ammonium chloride), a sadharana rasa also classed among ksharas; per Rasa Ratna Samuchaya it is dissolved in water, filtered, and the filtrate heated to dryness.
Navayasa lauha
Navayasa Cuma (Navayasa Churna, Navayasa Lauha) is an Ayurvedic herbo-mineral powder with Lauha Bhasma used for anemia (Pandu Roga), from Bhaisajya Ratnavali; trials show hemoglobin gains at 250 mg twice daily.
Navel
Navel (belly button, umbilicus): the fibrous scar left after the umbilical cord detaches, containing obliterated orifices of one vein and two arteries; landmark at T10, prone to hernia, urachal and omphalomesenteric remnant disease.
Navicixizumab
Navicixizumab (OMP-305B83) is a bispecific anti-DLL4/anti-VEGF monoclonal antibody developed by OncoMed, licensed to Feng Biosciences, tested in ovarian cancer phase 1-3 trials.
NAVIGATE trial
NAVIGATE (NCT02576431) is Bayer's phase 2 basket trial of larotrectinib in patients 12 and older with advanced NTRK fusion-positive solid tumors; key trial behind Vitrakvi's 2018 tumor-agnostic approval.
Navigation bronchoscopy
Navigation bronchoscopy is an image-guided bronchoscopic technique combining CT-based airway maps with real-time instrument tracking to reach peripheral lung lesions, with a pooled diagnostic yield of 70.9%.
Navigational bronchoscopy
Navigational bronchoscopy is a bronchoscopic technique that uses CT-derived airway maps and real-time image guidance to reach peripheral lung lesions for biopsy, with a diagnostic yield around 70%.