COLUMN – Aviation research on hierarchy and communication failures reveals a cultural predictor of patient safety: high-power-distance cultures silencing the voices that could prevent harm.

Words: Carlos Frederico Pinto, MD

_{"Culture eats strategy for breakfast and everything else for dinner." — Peter Drucker}

In his book Blink, Malcolm Gladwell traces most aviation accidents back to human error, and more specifically to communication failures: “A pilot knows something important and, somehow, fails to communicate it to the other.”

In 2017, researchers Enomoto and Geisler decided to test Gladwell's hypothesis that most aviation safety failures have cultural rather than technical roots. In a study spanning 68 countries and covering flight safety records between 1970 and 2012, they controlled for variables like GDP per capita, weather conditions, and flight volume.

Their finding: cultural differences made a measurable difference.

The characteristic most closely tied to safety outcomes was what sociologist Geert Hofstede termed the Power Distance Index (PDI) — a metric that captures how much a society accepts unequal distribution of power, and how rigidly hierarchical its authority structures tend to be. Hofstede tracked this across cultures for five decades, showing that many socioeconomic differences can be traced back to these deeply embedded cultural traits.

In the aviation study, a high PDI was consistently associated with a higher rate of safety incidents. Countries with high PDI scores see more of these events — not for lack of technology, but because of an excess of silent hierarchy.

The mechanism is straightforward, and worth taking seriously: in high-PDI cultures, a co-pilot who notices a captain's mistake faces a real psychological cost in speaking up. Rather than being direct, they often resort to what's known as mitigated speech — communication so softened to avoid confronting authority that it loses its clarity and, with it, its usefulness.

THE HEALTHCARE PARALLEL

Replace “pilot” with “department head” and “co-pilot” with “nurse” or “resident,” and you have a scenario that plays out daily in countless healthcare organizations.

My country, Brazil, ranks among the high-PDI nations, scoring 69 on Hofstede's scale, alongside Mexico, Turkey, and Greece. In a 2020 study, researcher Jeffrey Braithwaite and his colleagues grouped these exact nations into a cluster called the "Collective-Pyramidal" culture — characterized by rigid hierarchy, social status, high cultural cohesion, and strict respect for authority.

Strikingly, this cluster posted the worst healthcare performance indicators among the 35 OECD countries evaluated, based on 57 metrics spanning mortality, care quality, access, and resources.

DIFFERENT CULTURES, DIFFERENT OUTCOMES

Braithwaite’s study has been called the “black box” of global healthcare. By crossing Hofstede’s cultural dimensions with the OECD's Health at a Glance data and the UN’s Sustainable Development Goals (SDGs), three distinct clusters emerged with surgical clarity:

• The Collaborative-Networked Cluster (UK, Canada, Australia, US, and Nordic countries): this group features low PDI, low uncertainty avoidance, and high values of individualism and openness. The result? A striking 83% of these countries achieved the UN's sustainable health goals.
• The Orderly-Future Oriented Cluster (Germany, Japan, France): this group landed right in the middle ground.
• The Collective-Pyramidal Cluster (where Brazil culturally fits): not a single country in this cluster reached the UN goals. Not one.

Culture is not just a nation’s “vibe” or “way of being.” It is an independent, measurable predictor of healthcare outcomes, even when adjusting the system for local income and infrastructure.

WHEN ERRORS BECOME ROUTINE

There is a concept developed by American sociologist Diane Vaughan after the 1986 Challenger space shuttle disaster that we urgently need to bring into our healthcare management vocabulary: the normalization of deviance.

Vaughan described how clearly unsafe practices become culturally accepted simply because they don't produce immediate negative consequences. At NASA, the erosion of the O-rings — one of the primary physical causes of the tragedy — had been known for years. However, because previous missions had launched successfully despite the erosion, the risk was normalized over time. It was accepted as “normal operational wear” right up until the day the Challenger disintegrated in the sky.

In aviation, this manifests as rushed checklists, crew fatigue accepted as “part of the job,” and minor safety incidents that are never reported. In healthcare, it shows up as pro forma safe surgery checklists, critical communications omitted to avoid a hierarchical confrontation, adverse events underreported out of fear of punishment, and grueling back-to-back shifts treated as standard procedure.

In a global oncology study I co-authored, published in 2025 in the JCO Global Oncology, we identified similar patterns in cancer centers worldwide: high-PDI cultures consistently tend to centralize decisions, suppress open communication, and compromise the psychological safety of both clinical teams and patients.

On the Indian subcontinent, for example, the rigid hierarchy in Kashmir was directly associated with severe underreporting and subpar prostate cancer care. Meanwhile, in Finland (a low-PDI country), professionals expressed frustration when they encountered even a minor lack of the interprofessional collaboration they expected as the baseline norm.

CRM: AVIATION’S SOLUTION

Following a string of accidents attributed to communication breakdowns in heavily hierarchical cockpits, commercial aviation developed Crew Resource Management (CRM). This training system focuses not on technical flying skills, but on effective communication, distributed leadership, shared decision-making, and threat and error management. CRM operates on a premise that feels radical to high-PDI cultures: the co-pilot has a duty to challenge the captain — not just a right. There is still a hierarchy, but it is never allowed to silence safety.

A 2016 study by Haerkens showed that implementing CRM-based programs significantly reduced standardized mortality rates and vastly improved the safety climate in intensive care units.

This is the very essence of what Harvard professor Amy Edmondson calls “psychological safety” — the shared belief that a team is safe for interpersonal risk-taking, where members feel comfortable speaking up about mistakes, raising doubts, and asking questions without fear of humiliation or retaliation.

In our study, we proposed that programs like the American Society of Clinical Oncology's (ASCO) Quality Oncology Practice Initiative (QOPI) integrate psychological safety training. This serves as a culturally sensitive strategy to actively dismantle the barriers of high PDI in countries like Brazil and Mexico.

Edmondson’s advice is simple in theory, yet incredibly challenging in practice:

1. Set the stage: Clarify the shared purpose and explicitly state that honest mistakes are part of learning.
2. Invite participation: Demonstrate humility, openly say “I don't know,” and practice active listening.
3. Respond productively: Express genuine appreciation when people speak up, destigmatize failure, and refuse to tolerate clear, intentional violations.

RECLAIMING OUR VOICE

This transformation demands leaders who are secure enough to admit they don’t know, who thank those who point out errors, and who turn an adverse event into a collective learning opportunity rather than an individual trial. These may look like small behaviors, but they have a massive impact on the system. Every leader who breaks the cycle of hierarchical silence is quite literally saving lives.

Peter Drucker was right: culture eats strategy for breakfast. But the aviation data, the OECD clusters, and our own oncology research show us something even more urgent: culture can kill our patients.

Healthcare professionals who stay silent in the face of obvious errors in our operating rooms do not do so out of a lack of character. They are acting entirely rationally within a system that punishes speaking up and rewards silence.

In both healthcare and aviation, that silence is fatal. We must begin tracking and managing our psychological safety metrics with the exact same rigor, urgency, and severity that we apply to our hospital-acquired infection rates.

_THE AUTHOR