An Asian multicenter retrospective study on persistent pulmonary hypertension of the newborn: incidence, etiology, diagnosis, treatment and outcome

Abstract

Objectives: To explore the incidence, etiologies, diagnostic methods, treatment options and outcomes in neonates with persistent pulmonary hypertension of the newborn (PPHN) and to identify mortality risk factors in a study from six Asian countries.

Methods: A retrospective chart review of patients with documented PPHN from seven centers in six Asian countries (Japan, Kuwait, India, Pakistan, Singapore, and Thailand) between 1 January, 2014 and 31 December, 2016, was performed.

Results: A total of 369 PPHN infants were identified. The incidence of PPHN ranged from 1.2 to 4.6 per 1000 live births. The all-cause mortality rate was 20.6% (76 of 369). Meconium aspiration syndrome was the primary cause of PPHN (24.1%). In most cases (84.8%) echocardiography was used to establish the diagnosis of PPHN. Sildenafil was the most commonly used pulmonary vasodilator (51.2%). Multivariate multiple regression analysis indicated gestational age <34 weeks (adjusted odds ratio (OR) = 3.27; 95% CI 1.56–6.74), congenital diaphragmatic hernia (CDH)/lung hypoplasia (LH) (adjusted OR = 6.13 (95% CI 2.28–16.42)), treatment with high frequency oscillation ventilation (HFOV) with or without inhaled nitric oxide (iNO) (adjusted OR = 3.11 (95% CI 1.52–6.34)), and inotropic agents (adjusted OR = 9.43 (95% CI 2.71–32.83)) were independently associated with increased risk of death.

Conclusions: The incidence of PPHN in the current study was higher than in western settings. Birth weight, gestational age, CDH/LH, HFOV/iNO, and inotropic agents were significant mortality risk factors.

Keywords:

• Asian country
• developing country
• multicenter retrospective study
• newborn
• persistent pulmonary hypertension of the newborn

Acknowledgments

The authors thank Dr. Tejal Rao for collecting data at Cloudnine Hospital, Bangalore, India. The authors also thank Miss. Walailuk Jitpiboon, Department of Epidemiology, Faculty of Medicine, Prince of Songhla University, Songkhla, Thailand, for statistical analysis and Mr. Dave Patterson for English editing of the manuscript.

Disclosure statement

No potential conflict of interest was reported by the authors.